2023年12月14日发(作者：乐月华)

Java Web编程技术（第2版）

程序1.1

程序1.2

程序1.3

body {

font-family:Verdana; font-size:14px; margin:10;}

#container {

margin:0 auto; width:100%;

}

#header {

height:50px; background:#9c6; margin-bottom:5px;

}

#topmenu {

height:30px; background:#c0c0c0; margin-bottom:5px;

}

#middle {

margin-bottom:5px;

}

#leftmenu {

float:left; width:180px; background:#cf9;

}

#content {

float:left; background:#ffa;

}

#footer {

height:60px; background:#9c6;

clear:both;

} 程序1.4

程序1.5

package ;

import ption;

import tException;

import vlet;

import rvlet;

import rvletRequest;

import rvletResponse;

import .*; @WebServlet(name = "helloServlet", urlPatterns = { "/" })

public class HelloServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

n("");

n("");

n("

Hello,World!

n("现在的时间是:"+new ());

n("");

n("");

}

}

程序1.6

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

Hello,World!

现在的时间是：<%=new () %>

程序2.1

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

程序2.2

package ;

import .*;

import t.*;

import .*; import vlet;

@WebServlet(name="LoginServlet",urlPatterns={"/"})

public class LoginServlet extends HttpServlet {

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

String username = ameter("username");

String password = ameter("password");

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

n("");

if("admin".equals(username)&& "admin".equals(password)){

n("登录成功！欢迎您， "+username);

}else{

n("对不起！您的用户名或密码不正确．");

}

n("");

}

}

程序2.3

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/ClientInfoServlet")

public class ClientInfoServlet extends HttpServlet {

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

n("");

n("");

n("");

n("

客户端信息：

n("

n("

n("

n("

n("

n("

n("

n("

n("

n("

n("

n("

n("

n("

n("");

}

public void doPost(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

}

程序2.4

package ;

import .*;

import t.*;

import .*;

import ation;

import vlet;

@WebServlet("/ShowHeaders")

public class ShowHeadersServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException{

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

n("");

n("");

n("服务器收到的请求头信息

");

n(hod()+" "

+uestURI()+" "

+ryString()+" "

+tocol()+"

");

Enumeration headers = derNames();

while(eElements()){

String header = (String) ement();

String value = der(header);

n(header+" = "+value+"

");

}

n("");

}

}

程序2.5

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet(name="LoginServlet",urlPatterns={"/"})

public class LoginServlet extends HttpServlet {

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

String username = ameter("username");

String password = ameter("password");

// 用户名和口令均为admin，认为登录成功

if(("admin")&&("admin")){

ribute("username", username);

RequestDispatcher rd = uestDispatcher("/");

d(request, response);

}else{

RequestDispatcher rd =

uestDispatcher("/");

d(request, response);

}

}

}

程序2.6

Your are welcome!

${username}

程序2.7

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

请回答下面的问题：

程序2.8

package ;

import ption;

import riter;

import tException;

import vlet;

import rvlet;

import rvletRequest;

import rvletResponse;

@WebServlet(name="SimpleTestServlet",urlPatterns={"/"}) public class SimpleTestServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

String quest1 = ameter("quest1");

String quest2 = ameter("quest2");

String[] quest3 = ameterValues("quest3");

String quest4 = ameter("quest4").trim();

int score = 0;

if(quest1!=null && ("1")){

score = score+25; // 答对一道题加25分

}

if(quest2!=null&& ("3")){

score = score+25;

}

if(quest3!=null&&==2&&quest3[0].equals("1")&&

quest3[1].equals("3")){

score = score+25;

}

if(quest4!=null&& (("HttpServlet")||

("rvlet"))){

score = score+25;

}

n("");

n("");

n("");

n("你的成绩是："+score+"分");

n("");

}

}

程序2.9

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

${message}

程序2.10

package ;

import .*;

import t.*;

import .*;

import tion.*;

@WebServlet(name="FileUploadServlet",urlPatterns={"/"})

@MultipartConfig(location="D:",fileSizeThreshold=1024)

public class FileUploadServlet extends HttpServlet{

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

// 返回Web应用程序文档根目录

String path = vletContext().getRealPath("/");

String mnumber = ameter("mnumber");

Part p = t("fileName");

String message="";

if(e() >1024*1024){ // 上传的文件不能超过1MB大小

();

message = "文件太大，不能上传！";

}else{

path = path + "member" +mnumber;

File f = new File(path);

if( !()){ // 若目录不存在，则创建目录

();

}

String h = der("content-disposition");

// 得到文件名

String fname = ing(dexOf("")+1, ()-1);

(path + ""+ fname);

message = "文件上传成功！";

}

ribute("message", message);

RequestDispatcher rd = uestDispatcher("/");

d(request, response);

}

}

程序2.11

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet(name="ExcelServlet",urlPatterns={"/"})

public class ExcelServlet extends HttpServlet{

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException{

//指定页面在传输过程中使用的编码方式

der("Content-Encoding","gb2312");

// 设置响应的内容类型

tentType("application/-excel;charset=gb2312");

PrintWriter out = ter();

n("学号t姓名t性别t年龄t所在系");

n("95001t李勇t男t20t信息");

n("95002t刘晨t女t19t数学");

}

}

程序2.12

package ;

import .*;

import .*;

import DateFormat;

import t.*;

import .*;

import vlet;

@WebServlet("/ShowTimeServlet")

public class ShowTimeServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException{

tentType("text/html;charset=UTF-8");

der("Refresh","5");

PrintWriter out = ter();

Date date = new Date();

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd a HH:mm:ss");

String s = (date); // 对日期对象格式化

n("");

n("");

n("

每5秒钟刷新一次页面

");

n("

现在的时间是："+s+"

");

n("");

n("");

}

}

程序2.13

package ;

import .*;

import t.*;

import .*;

import tion.*;

@WebServlet(name="SendRedirect",urlPatterns={"/"})

public class RedirectServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws IOException,ServletException{

String userAgent = der("User-Agent"); // 在请求对象上存储一个属性

ribute("param1", "请求作用域属性");

// 在会话对象上存储一个属性

sion().setAttribute("param2", "会话作用域属性");

if((userAgent!=null)&&(f("MSIE")!=-1)){

direct("");

}else{

direct("localhost:8080/");

}

}

}

程序2.14

package ;

import ption;

import tException;

import vlet;

import .*;

import riter;

@WebServlet("/StatusServlet")

public class StatusServlet extends HttpServlet {

protected void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

String qq = ameter("q");

if(qq==null){

n("没有提供请求参数。");

}else if(("0")){

n(tus()+"

");

n("Hello,Guys!");

}else if(("1")){

tus(_FORBIDDEN);

}else if(("2")){

tus(_UNAUTHORIZED);

}else{

ror(404,"resource cannot founddd!");

}

}

}

程序2.15

xmlns:xsi="/2001/XMLSchema-instance"

xsi:schemaLocation="/xml/ns/javaee

/xml/ns/javaee/web-app_3_"

version="3.0" metadata-complete="true">

Welcome to Helloweb

Welcome to Helloweb

…

程序2.16

package ;

import .*;

import t.*;

import tion.*;

import .*;

@WebServlet(name="ConfigDemoServlet",

urlPatterns = {"/"},

initParams = {

@WebInitParam(name="email",value="**************"), @WebInitParam(name = "telephone", value = "8899123")

})

public class ConfigDemoServlet extends HttpServlet{

String servletName = null;

ServletConfig config = null;

String email = null;

String telephone = null;

public void init(ServletConfig config) {

= config;

servletName = vletName();

email = tParameter("email");

telephone = tParameter("telephone");

}

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

n("");

n("");

n("Servlet名称："+servletName+"

");

n("Email地址："+email+"

");

n("电话："+telephone);

n("");

}

}

程序3.1

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/")

public class FileDownloadServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

// 设置文件的内容类型

tentType("image/gif");

// 设置Content-Disposition响应头，指定文件名

der("Content-Disposition",

"attachment;filename="); // 获得输出流对象

OutputStream os = putStream();

ServletContext context = getServletContext();

// 返回输入流对象

InputStream is =

ourceAsStream("/files/");

byte[] bytearray = new byte[1024];

int bytesread = 0;

// 从输入流中读取1K字节，然后写到输出流中

while((bytesread = (bytearray)) != -1 ){

// 将数据发送到客户端

(bytearray, 0, bytesread);

}

();

();

}

}

程序3.2

package ;

import .*;

import t.*;

import .*;

import ;

import vlet;

@WebServlet("/ShowSessionServlet")

public class ShowSessionServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=utf-8");

// 创建或返回用户会话对象

HttpSession session = sion(true);

String heading = null;

// 从会话对象中检索accessCount属性

Integer accessCount = (Integer)ribute("accessCount");

if(accessCount==null){

accessCount = new Integer(1);

heading = "欢迎您，首次登录该页面！";

}else{

heading = "欢迎您，再次访问该页面！";

accessCount = accessCount+1;

}

// 将accessCount作为属性存储到会话对象中

ribute("accessCount",accessCount);

PrintWriter out = ter();

n("");

n("");

n("

}

}

程序3.3

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/GuessNumberServlet")

public class GuessNumberServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

int magic = (int)(()*101);

HttpSession session = sion();

ribute("num",new Integer(magic));

tentType("text/html;charset=utf-8");

PrintWriter out = ter();

n("");

n("我想出一个0到100之间的数，请你猜！");

n("

n("");

}

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

int guess = nt(ameter("guess"));

HttpSession session = sion();

int magic = (Integer)ribute("num");

tentType("text/html;charset=utf-8");

PrintWriter out = ter();

n("");

if(guess==magic){

date(); // 销毁会话对象

n("祝贺你，答对了!");

n("

再猜一次.");

}else if(guess>magic){ n("太大了! 请重猜!");

}else{

n("太小了! 请重猜!");

}

n("

n("");

}

}

程序3.4

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/SendCookie")

public class SendCookieServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws IOException,ServletException{

Cookie userCookie = new Cookie("username", "hacker");

Age(60*60*24*7);

kie(userCookie);

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

n("");

n("

已向浏览器发送一个Cookie。

n("");

}

}

程序3.5

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/ReadCookie")

public class ReadCookieServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws IOException,ServletException{

String cookieName = "username";

String cookieValue = null;

Cookie[] cookies = kies();

if (cookies!=null){

for(int i = 0;i<;i++){

Cookie cookie = cookies[i];

if(e().equals(cookieName)) cookieValue = ue();

}

}

tentType("text/html;charset=utf-8");

PrintWriter out=ter();

n("");

n("

从浏览器读回一个Cookie

n("Cookie名:"+cookieName+"

");

n("Cookie值:"+cookieValue+"

");

n("");

}

}

程序3.6

<%@ page contentType="text/html;charset=UTF-8"

pageEncoding="UTF-8"%>

${e}

程序3.7

package ;

import ption;

import t.*;

import .*;

import vlet;

@WebServlet("/CheckUserServlet")

public class CheckUserServlet extends HttpServlet {

String message = null;

protected void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=utf-8");

String value1 = "",value2="";

Cookie cookie = null;

Cookie[] cookies = kies();

if (cookies!=null){

for(int i = 0;i<;i++){

cookie = cookies[i];

if(e().equals("username"))

value1 = ue();

if(e().equals("password"))

value2 = ue();

}

if(("admin")&&("admin")){

message = "欢迎您！"+value1+"再次登录该页面！";

sion().setAttribute("message", message);

direct("");

}else{

direct("");

}

}else{

direct("");

}

}

protected void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=utf-8");

String username = ameter("username").trim();

String password = ameter("password").trim();

if(!("admin") || !("admin")){

message = "用户名或口令不正确，请重试！";

sion().setAttribute("message",message);

direct("");

}else{

// 如果用户选中了“自动登录”复选框，向浏览器发送2个Cookie

if((ameter("check")!=null) &&

(ameter("check").equals("check"))){

Cookie nameCookie = new Cookie("username", username);

Cookie pswdCookie = new Cookie("password", password);

Age(60*60);

Age(60*60);

kie(nameCookie);

kie(pswdCookie);

}

message = "你已成功登录！";

sion().setAttribute("message",message);

direct("");

}

}

}

程序4.1

<%@ page contentType="text/html;charset = UTF-8" %>

<%! int count = 0; %>

<%

count++;

%>

该页面已被访问<%=count %> 次。

程序4.2

<%!

int anInt = 3;

boolean aBool = true;

Integer anIntObj = new Integer(3);

Float aFloatObj = new Float(8.6); %>

<%= 500+380 %>

<%= anInt*3.5/100-500 %>

<%= aBool %>

<%= () %>

<%= aFloatObj %>

程序4.3

<%@page import="" %>

<%@page import="rmat"%>

<%@page contentType="text/html;charset=UTF-8" %>

<%

DateFormat dateFormat = eInstance();

String s = (new Date());

%>

今天的日期是：<%=s%>

程序4.4

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%!

int count = 0;

public void jspInit(){ // 覆盖jspInit()

n("");

}

public void jspDestroy(){ // 覆盖jspDestroy()

n("");

}

%>

<%count++;%>

覆盖jspInit()和jspDestroy()！

该页面被访问<%=count%>次。

程序4.5

<%@ page contentType="text/html; charset=UTF-8" %>

<%@ page errorPage="" %>

<%

if (ameter("name")==null){

throw new RuntimeException("没有指定name 请求参数。");

}

%>

Hello, <%=ameter("name")%>

程序4.6

<%@ page contentType="text/html; charset=UTF-8" %>

<%@ page isErrorPage="true" %>

页面发生了下面错误：<%=sage()%>

请重试！

程序4.7

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%

String s = ameter("radius");

if(s==null)

s = "0";

r = ouble(s);

%>

半径为<%= r %>的圆的面积为：<%=area(r)%>

<%!

double r = 0; // 声明一个变量r

double area(double r) { // 声明求圆面积的方法

return r * r * ;

}

%>

程序4.8

<%@ page contentType="text/html;charset=utf-8"%>

<%

for(int n = 2;n < 100;n++){

int i;

for(i = 2;i < n;i++){

if(n % i==0)

break;

}

if(i==n){

%> <%=n%>  

<%

}

}

%>

程序4.9 todayDate_

…

public void _jspService( HttpServletRequest request,

HttpServletResponse response)

throws IOException,ServletException {

// 其他代码

PageContext pageContext = null;

HttpSession session = null;

ServletContext application = null;

ServletConfig config = null;

JspWriter out = null;

Object page = this;

// 创建有关对象的代码

pageContext = _eContext(this, request, response,

null, true, 8192, true);

session = sion();

application = vletContext();

config = vletConfig();

out = ();

// 其他代码

}

程序4.10

<%@ page isErrorPage='true' %>

<%@ page contentType="text/html;charset=utf-8"%>

页面发生了下面错误：<%=ng()%>

程序4.11

<%@ page contentType="text/html;charset=utf-8" %>

My name is Duke. What is yours?

<%! String userName="Duke"; %>

<%@include file="" %>

程序4.12 <%@ page contentType="text/html;charset=utf-8" %>

<% userName=ameter("username");%>

Hello, <%=userName%>!

程序4.13

<%@ page contentType="text/html;charset=UTF-8"%>

My name is Duke. What is yours?

<% String userName = ameter("username");

ribute("username",userName);

%>

程序4.14

<%@ page contentType="text/html;charset = UTF-8" %>

<% String userName = (String)ribute("username");%>

Hello, <%=userName%>!

程序4.15

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

程序4.16

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

程序4.17

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

商品分类

• 手机数码
• 家用电器
• 汽车用品
• 服饰鞋帽
• 运动健康

程序4.18

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

程序4.19

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

关于我们|联系我们|人才招聘|友情链接

Copyright © 2012 派派电子商城有限责任公司,8899123.

程序4.20

package ;

public class Customer{ // 属性声明

private String custName;

private String email;

private String phone;

// 构造方法的定义

public Customer(){}

public Customer(String custName, String email, String phone){

me = custName;

= email;

= phone;

}

// getter方法

public String getCustName(){ return me; }

public String getEmail(){ return ; }

public String getPhone(){ return ; }

// setter方法

public void setCustName(String custName){ me = custName; }

public void setEmail(String email){ = email; }

public void setPhone(String phone){ = phone; }

}

程序4.21

<%@ page contentType="text/html; charset=UTF-8" %>

输入客户信息

程序4.22

package ;

import t.*;

import .*;

import vlet;

@WebServlet("/CustomerServlet")

public class CustomerServlet extends HttpServlet {

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ption,ServletException {

String name = ameter("custName");

String email = ameter("email");

String phone = ameter("phone");

Customer customer = new Customer(name,email,phone);

HttpSession session = sion();

synchronized(session) { ribute("customer", customer);

}

RequestDispatcher rd =

uestDispatcher("/");

d(request,response);

}

}

程序4.23

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

客户信息如下

程序5.1

JSP Expression Language Example

程序5.2

package ; import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/VariableServlet")

public class VariableServlet extends HttpServlet {

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

ribute("attrib1", new Integer(100));

HttpSession session = sion();

ribute("attrib2", "Java World!");

ServletContext application = getServletContext();

ribute("attrib3",new ());

ribute("attrib4", "请求作用域");

ribute("attrib4", "会话作用域");

ribute("attrib4", "应用作用域");

// 请求转发到JSP页面

RequestDispatcher rd =

uestDispatcher("/");

d(request, response);

}

}

程序5.3

<%@ page contentType="text/html;charset=UTF-8" %>

访问作用域变量

• 属性1: ${attrib1}

• 属性2: ${attrib2}

• 属性3: ${attrib3}

• 属性4: ${attrib4}

程序5.4

package ;

public class Address implements izable {

private String city;

private String street;

private String zipCode;

public Address() { }

public Address(String city,String street,String zipCode) {

=city;

=street;

e=zipCode;

}

// 这里省略了属性的getter方法和setter方法

}

程序5.5 package ;

public class Employee implements izable{

private String empName;

private String email;

private String phone;

private Address address;

public Employee(){}

public Employee(String empName,String email,

String phone,Address address ){

e=empName;

=email;

=phone;

s=address;

}

public void setEmpName(String empName){ e = empName; }

public void setEmail(String email) { = email; }

public void setPhone(String phone) { = phone; }

public void setAddress(Address address){ s=address;}

public String getEmpName(){ return e; }

public String getEmail() { return ; }

public String getPhone() { return ; }

public Address getAddress(){ return address; }

}

程序5.6

package ;

import .*;

import t.*;

import .*;

import s;

import ee;

import vlet;

@WebServlet("/EmployeeServlet")

public class EmployeeServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

Address address = new Address("上海市",

"科技路25号","201600");

Employee employee = new Employee("automan",

"**************","8899123",address); ribute("employee", employee);

RequestDispatcher rd =

uestDispatcher("/");

d(request, response);

}

}

程序5.7

<%@ page contentType="text/html;charset = UTF-8" %>

使用EL访问JavaBeans的属性

• 员工名：${e}

• Email地址：${}

• 电话：${}

• 客户地址：

  • 城市：${}

  • 街道：${}

  • 邮编：${e}

程序5.8

package ;

import .*;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/CollectServlet")

public class CollectServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

tentType("text/html;charset=UTF-8");

ArrayList country = new ArrayList();

("China");

("England");

("Russia");

HashMap capital = new HashMap();

("China","北京");

("England","伦敦");

("Russia","莫斯科");

ribute("country",country);

ribute("capital",capital);

RequestDispatcher rd =

uestDispatcher("/");

d(request,response);

}

}

程序5.9

<%@ page contentType="text/html;charset=UTF-8" %>

Accessing Collections

• Capital of ${country[0]} is ${capital["China"]}

• Capital of ${country[1]} is ${capital["England"]}

• Capital of ${country[2]} is ${}

程序5.10

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ page import=".*" %>

<%

Address address = new Address("上海",

"科技路25号","201600");

Employee employee = new Employee("automan",

"**************","8899123",address); ribute("employee", employee);

Cookie cookie = new Cookie("userName","Hacker");

kie(cookie);

%>

EL隐含变量的使用

程序6.1

package ;

import .*;

import .*;

import .*;

public class HelloTag implements SimpleTag{

JspContext jspContext = null;

JspTag parent = null;

public void setJspContext(JspContext jspContext){

text = jspContext;

}

public void setParent(JspTag parent){

= parent;

}

public void setJspBody(JspFragment jspBody){

}

public JspTag getParent(){

return parent;

}

public void doTag() throws JspException, IOException{

JspWriter out = ();

("Hello, A simple tag.

");

("现在时间是："+ new ()); }

}

程序6.2

xmlns:xsi="/2001/XMLSchema-instance"

xsi:schemaLocation="/xml/ns/j2ee

/xml/ns/j2ee/web-jsptaglibrary_2_"

version="2.1">

1.0

TagExample

/sample

hello

ag

empty

程序6.3

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib prefix="demo" uri="/sample" %>

Hello Tag Example

程序6.4

package ;

import .*;

import .*;

import .*;

public class RedStarTag extends SimpleTagSupport {

public void doTag() throws JspException, IOException{

JspWriter out = getJspContext().getOut();

("*");

}

}

程序6.5

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib uri="/sample" prefix="demo" %>

请输入客户信息，带的域必须填写。

程序6.6

package ;

import .*;

import .*;

import .*;

public class WelcomeTag extends SimpleTagSupport {

private String user;

public void setUser(String user) {

= user;

}

public void doTag() throws JspException, IOException {

JspWriter out = getJspContext().getOut();

try{

if (user==null){

("Welcome, Guest!

");

}else{

("Welcome, "+user+"!

");

}

} catch(Exception e){

throw new JspException("Error in ()");}

}

}

程序6.7

<%@ taglib prefix="demo" uri="/sample" %>

程序6.8

package ;

import .*;

import .*;

import .*;

public class BodyTagDemo extends SimpleTagSupport{

public void doTag() throws JspException, IOException{

JspWriter out = getJspContext().getOut();

("输出标签体前

");

// 获得标签体内容并发送到JSP显示 getJspBody().invoke(null);

("
输出标签体后

");

}

}

程序6.9

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%@ taglib prefix="demo" uri="/sample" %>

Tag with body

这是标签体内容.

程序6.10

package ;

import .*;

import .*;

import .*;

public class MarkerTag extends SimpleTagSupport {

private String search = null; // search属性

public void setSearch(String search){

= search;

}

public void doTag() throws JspException, IOException{

JspWriter out = getJspContext().getOut();

StringWriter sw = new StringWriter();

getJspBody().invoke(sw);

String text = ng();

int len = ();

int oldIndex=0, newIndex=0;

while((newIndex = f(search,oldIndex))>=0){

if (newIndex

break;

}

(ing(oldIndex,newIndex));

(""+search+"");

oldIndex = newIndex + len;

}

(ing(oldIndex));

}

}

程序6.11

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib prefix="demo" uri="/sample" %>

she sells sea shells on the sea shore!

程序6.12

package ;

import .*;

import .*;

import .*;

public class LoopTag extends SimpleTagSupport{

private int count = 0;

public void setCount(int count){

= count;

}

public void doTag() throws JspException,IOException{

JspWriter out = getJspContext().getOut();

StringWriter sw = new StringWriter();

getJspBody().invoke(sw);

String text = ng();

for(int i = 1;i<=count;i++){

(""+text+"");

}

}

}

程序6.13

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib prefix="demo" uri="/sample" %>

这是标签体内容！

程序6.14

package ;

// 这里省略了若干导入语句

@WebServlet("/ProductServlet")

public class ProductServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

Connection dbconn = null;

public void init() {

String driver = "";

String dburl = "jdbc:postgresql://127.0.0.1:5432/postgres";

String username = "postgres";

String password = "postgres";

try{

e(driver); // 加载驱动程序

// 创建连接对象

dbconn = nection(

dburl,username,password);

}catch(ClassNotFoundException e1){

}catch(SQLException e2){}

}

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

ArrayList prodList = null;

prodList = new ArrayList();

try{

String sql="SELECT * FROM products WHERE prod_id < 'P4'";

PreparedStatement pstmt = eStatement(sql);

ResultSet result = eQuery();

while(()){

Product product = new Product();

d_id(ing("prod_id"));

me(ing("pname"));

ce(ble("price"));

ck(("stock"));

(product);

}

if(!y()){

sion().setAttribute("prodList",prodList);

direct("/helloweb/");

}else{

direct("/helloweb/");

}

}catch(SQLException e){

tackTrace();

}

}

}

程序6.15

package ;

import .*;

import .*;

import .*;

import .*;

import t;

public class ProductTag extends SimpleTagSupport{

private ArrayList productList;

public void setProductList(ArrayList productList){

tList = productList;

}

public void doTag() throws JspException, IOException{

for(Product product:productList){

getJspContext().setAttribute("product", product);

getJspBody().invoke(null);

}

}

}

程序6.16

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib prefix="demo" uri="/sample" %>

程序6.17

package ;

import .*;

import .*;

import .*;

public class MathTag extends SimpleTagSupport

implements DynamicAttributes{

double num = 0;

String output = "";

public void setNum(double num){

= num;

}

public void setDynamicAttribute(String uri, String localName,

Object value ) throws JspException{

double val = ouble((String)value);

if (localName == "min"){

output = output + " "+num+"与"+val+"的最小值" +

"" + (num, val) + "";

} else if (localName == "max"){

output = output + " "+num+"与"+val+"的最大值" +

"" + (num, val) + "";

} else if (localName == "pow"){

output = output + ""+num+" 的 "+val+

" 次方"+""+(num, val)+"";

}

}

public void doTag() throws JspException, IOException{

getJspContext().getOut().print(output);

}

}

程序6.18

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib prefix="demo" uri="/sample" %>

动态属性的使用

程序6.19

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib prefix="demo" uri="/sample" %>

Hello!

Good Bye!!

I am Dumb

程序6.20

package ;

import .*;

import .*;

import .*;

public class SwitchTag extends SimpleTagSupport{

private String conditionValue;

private boolean caseFound = false;

public void setConditionValue(String value) {

ionValue =value;

}

public String getConditionValue() {

return conditionValue;

}

public void setCaseFound(boolean caseFound){

und = caseFound;

}

public boolean getCaseFound(){

return caseFound;

}

public void doTag() throws JspException,IOException{

if (("")){

getJspContext().getOut().print

("You did not provide 'action' parameter.");

}else{

getJspBody().invoke(null);

}

}

}

程序6.21

package ;

import .*;

import .*;

import .*; public class CaseTag extends SimpleTagSupport{

private String caseValue;

public void setCaseValue(String caseValue){

lue = caseValue;

}

public void doTag() throws JspException,IOException{

SwitchTag parent =(SwitchTag) getParent(); // 返回父标签引用

String conditionValue = ditionValue();

if ((caseValue)){

eFound(true);

getJspBody().invoke(null);

}else{

return; // 不执行标签体

}

}

}

程序6.22

package ;

import .*;

import .*;

import .*;

public class DefaultTag extends SimpleTagSupport {

public void doTag() throws JspException,IOException{

SwitchTag parent =(SwitchTag) getParent();

if(eFound()){

return;

}else{

getJspBody().invoke(null);

}

}

}

程序6.23

<%@ page contentType="text/html; charset=UTF-8" %>

<%@ taglib prefix="c" uri="/jsp/jstl/core" %>

OLYMPUS数码相机

程序6.24

<%@ taglib uri="/jsp/jstl/core" prefix="c" %>

${y}*${x}=${x*y}

程序6.25 foreach_

<%@ taglib uri="/jsp/jstl/core" prefix="c" %>

程序6.26

package ;

import ption;

import tDispatcher;

import tException;

import vlet;

import rvlet;

import rvletRequest;

import rvletResponse;

import ;

import ist;

import ;

@WebServlet("/BooksServlet")

public class BooksServlet extends HttpServlet {

@Override

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

List books = new ArrayList();

Book book1 = new Book("978-7-302-23059-5","Java语言程序设计",45.00);

Book book2 = new Book("978-7-302-21540-0","Java Web编程技术",39.00);

Book book3 = new Book("978-7-302-24130-0","C #入门经典",99.80);

(book1);

(book2);

(book3);

ribute("books", books); RequestDispatcher rd = uestDispatcher("/");

d(request, response);

}

}

程序6.27

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ page import=".*," %>

<%@ taglib uri="/jsp/jstl/core" prefix="c" %>

varStatus="status">

<%--为奇数行和偶数行设置不同的背景颜色--%>

<%--用EL访问作用域变量的成员--%>

程序6.28

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib uri="/jsp/jstl/core" prefix="c" %>

value="白日依山尽,黄河入海流,欲穷千里目,更上一层楼" />

程序6.29

<%@ taglib uri="/jsp/jstl/core" prefix="c" %> <%@ page contentType="text/html;charset=UTF-8" %>

You are welcome to my home page!

程序6.30

<%@ page contentType="text/html; charset=UTF-8"%>

关于我们|联系我们|人才招聘|友情链接

Copyright © 2012 派派电子商城有限责任公司,8899123.

E-mail Address:${}

程序7.1

package ;

import izable;

public class Product implements Serializable {

private String prod_id;

private String pname;

private double price;

private int stock;

public Product() { }

public Product(String prod_id, String pname,

double price, int stock) {

_id = prod_id;

= pname;

= price;

= stock;

}

public String getProd_id() {

return prod_id;

}

public void setProd_id(String prod_id) {

_id = prod_id;

}

public String getPname() {

return pname;

}

public void setPname(String pname) {

= pname;

}

public double getPrice() {

return price;

}

public void setPrice(double price) {

= price;

}

public int getStock() {

return stock;

} public void setStock(int stock) {

= stock;

}

}

程序7.2

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

查询所有商品

程序7.3

package ;

import .*;

import .*;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/")

public class QueryProductServlet extends HttpServlet{

private static final long serialVersionUID = 1L;

Connection dbconn = null;

public void init() {

String driver = "";

String dburl = "jdbc:postgresql://127.0.0.1:5432/postgres";

String username = "postgres";

String password = "postgres";

try{

e(driver); // 加载驱动程序

// 创建连接对象

dbconn = nection(

dburl,username,password);

}catch(ClassNotFoundException e1){

n(e1);

}catch(SQLException e2){}

}

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

String productid = ameter("productid");

try{

String sql="SELECT * FROM products WHERE prod_id = ?";

PreparedStatement pstmt = eStatement(sql);

ing(1,productid);

ResultSet rst = eQuery(); if(()){

Product product = new Product();

d_id(ing("prod_id"));

me(ing("pname"));

ce(ble("price"));

ck(("stock"));

sion().setAttribute("product", product);

direct("/helloweb/");

}else{

direct("/helloweb/");

}

}catch(SQLException e){

tackTrace();

}

}

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

ArrayList productList = null;

productList = new ArrayList();

try{

String sql="SELECT * FROM products";

PreparedStatement pstmt = eStatement(sql);

ResultSet result = eQuery();

while(()){

Product product = new Product();

d_id(ing("prod_id"));

me(ing("pname"));

ce(ble("price"));

ck(("stock"));

(product);

}

if(!y()){

sion().setAttribute("productList",productList);

direct("/helloweb/");

}else{

direct("/helloweb/");

}

}catch(SQLException e){

tackTrace();

}

}

public void destroy(){

try {

();

}catch(Exception e){

tackTrace();

}

}

}

程序7.4

<%@ page contentType="text/html; charset=utf-8" %>

scope="session">

程序7.5

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%@ page import=".*,t" %>

<% ArrayList productList =

(ArrayList)ribute("productList");

for(Product product:productList){

%>

<%

}

%>

程序7.6

<%@ page contentType="text/html; charset=UTF-8" %>

该商品不存在。返回

程序7.7

name="jdbc/sampleDS"

type="urce"

maxActive="4"

maxIdle="2"

username="paipaistore" maxWait="5000"

driverClassName=""

password="paipaistore"

url="jdbc:postgresql://localhost:5432/paipaistore"/>

程序7.8

package ;

import .*;

import .*;

import urce;

import t.*;

import vlet;

import .*;

import t;

import .*;

import .*;

@WebServlet("/")

public class ProductQueryServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

DataSource dataSource;

public void init() {

try {

Context context = new InitialContext();

dataSource =

(DataSource)("java:comp/env/jdbc/sampleDS");

}catch(NamingException ne){

n("Exception:"+ne);

}

}

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

Connection dbconn = nection();

// 代码同程序7.3的doPost()

}

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

Connection dbconn = nection();

// 代码同程序7.3的doGet()

}

}

程序7.9

global = "jdbc/paipaistore"

name = "jdbc/sampleDS"

type = "urce"/>

WEB-INF/

程序7.10 package ;

import izable;

public class Customer implements Serializable{

private String cust_id;

private String cname;

private String email;

private double balance;

public String getCust_id() {

return cust_id;

}

public void setCust_id(String cust_id) {

_id = cust_id;

}

public String getCname() {

return cname;

}

public void setCname(String cname) {

= cname;

}

public String getEmail() {

return email;

}

public void setEmail(String email) {

= email;

}

public double getBalance() {

return balance;

}

public void setBalance(double balance) {

e = balance;

}

}

程序7.11

package ;

import .*;

import urce;

import .*;

public class BaseDao {

DataSource dataSource;

// 在构造方法中返回数据源对象

public BaseDao () {

try {

Context context = new InitialContext();

dataSource =

(DataSource)("java:comp/env/jdbc/sampleDS");

}catch(NamingException ne){

n("Exception:"+ne);

}

}

// 返回一个连接对象

public Connection getConnection()throws Exception{

return nection();

}

} 程序7.12

package ;

import .*;

import ist;

import er;

public class CustomerDao extends BaseDao{

// 插入一条客户记录

public boolean addCustomer(Customer customer){

String sql = "INSERT INTO customers" +

"(cust_id,cname,email,balance)VALUES(?,?,?,?)";

try(

Connection conn = nection();

PreparedStatement pstmt = eStatement(sql))

{

ing(1,t_id());

ing(2,me());

ing(3,il());

ble(4,ance());

eUpdate();

return true;

}catch(SQLException se){

tackTrace();

return false;

}

}

// 按姓名检索客户记录

public Customer findByName(String cname){

String sql = "SELECT cust_id,cname,email,balance" +

" FROM customers WHERE cname=?";

Customer customer = new Customer();

try(

Connection conn = nection();

PreparedStatement pstmt = eStatement(sql)){

ing(1,cname);

try(ResultSet rst = eQuery()){

if(()){

t_id(ing("cust_id"));

me(ing("cname"));

il(ing("email"));

ance(ble("balance"));

}

}

}catch(SQLException se){

return null;

}

return customer;

}

// 查询所有客户信息

public ArrayList findAllCustomer(){

Customer customer = new Customer();

ArrayList custList = new ArrayList();

String sql = "SELECT * FROM customers";

try(

Connection conn = nection();

PreparedStatement pstmt = eStatement(sql);

ResultSet rst = eQuery()){ while(()){

t_id(ing("cust_id"));

me(ing("cname"));

il(ing("email"));

ance(ble("balance"));

(customer);

}

return custList;

}catch(SQLException e){

tackTrace();

return null;

}

}

}

程序7.13

<%@ page contentType="text/html; charset=UTF-8" %>

${result}

请输入一条客户记录

程序7.14

package ;

import .*;

import t.*;

import .*;

import er;

import erDao;

import vlet;

@WebServlet("/")

public class AddCustomerServlet extends HttpServlet{

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

CustomerDao dao = new CustomerDao();

Customer customer = new Customer();

String message = null;

try{

t_id(ameter("cust_id"));

// 将传递来的字符串重新使用utf-8编码，以免产生乱码

me(new String(ameter("cname")

.getBytes("iso-8859-1"),"UTF-8")); il(new String(ameter("email")

.getBytes("iso-8859-1"),"UTF-8"));

ance(

ouble(ameter("balance")));

boolean success = tomer(customer);

if(success){

message = "

}else{

message = "

}

}catch(Exception e){

message = "

}

ribute("result", message);

RequestDispatcher rd =

getServletContext().getRequestDispatcher("/");

d (request,response);

}

}

程序8.1

package er;

import .*;

import ;

import t.*;

import .*;

import tener;

@WebListener // 使用注解注册监听器

public class MyContextListener implements ServletContextListener,

ServletContextAttributeListener{

private ServletContext context = null;

public void contextInitialized(ServletContextEvent sce){

Context ctx = null;

DataSource dataSource = null;

context = vletContext();

try{

if(ctx == null){

ctx = new InitialContext();

}

dataSource = (DataSource)("java:comp/env/jdbc/sampleDS");

}catch(NamingException ne){

("Exception:"+ne);

}

ribute("dataSource",dataSource); // 添加属性

("应用程序已启动："+new Date());

}

public void contextDestroyed(ServletContextEvent sce){

context = vletContext();

Attribute("dataSource");

("应用程序已关闭："+new Date());

}

public void attributeAdded(ServletContextAttributeEvent sce){

context = vletContext();

("添加一个属性："+e()+"："+ue());

}

public void attributeRemoved(ServletContextAttributeEvent sce){ context = vletContext();

("删除一个属性："+e()+"："+ue());

}

public void attributeReplaced(ServletContextAttributeEvent sce){

context = vletContext();

("替换一个属性："+e()+"："+ue());

}

}

程序8.2

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ page import=".*,.*" %>

<%

DataSource dataSource =

(DataSource)ribute("dataSource");

Connection conn = nection();

Statement stmt = Statement();

ResultSet rst = eQuery(

"SELECT * FROM products WHERE prod_id>'P2'");

%>

商品表中信息

<% while (()){ %>

<% } %>

程序8.3

package er;

import rvletRequest;

import tRequestEvent;

import tRequestListener;

import tener;

@WebListener

public class MyRequestListener

implements ServletRequestListener{

private int count = 0;

public void requestInitialized(ServletRequestEvent re){

HttpServletRequest request=

(HttpServletRequest)vletRequest();

if(uestURI().endsWith("")){

count++;

vletContext().setAttribute("count",new Integer(count));

}

}

public void requestDestroyed(ServletRequestEvent re){

} }

程序8.4

<%@ page contentType="text/html;charset=UTF-8" %>

欢迎您，您的IP地址是${Addr}

自应用程序启动以来，该页面被访问了

${}

次

程序8.5

package er;

import t.*;

import .*;

import ist;

import tener;

@WebListener

public class MySessionListener implements HttpSessionListener{

private ServletContext context = null;

public void sessionCreated(HttpSessionEvent se){

HttpSession session = sion();

context = vletContext();

ArrayList sessionList = (ArrayList)

ribute("sessionList");

if(sessionList==null){

sessionList = new ArrayList();

ribute("sessionList",sessionList);

}else{

(session);

}

("创建一个会话："+());

}

public void sessionDestroyed(HttpSessionEvent se){

HttpSession session = sion();

context = vletContext();

ArrayList sessionList = (ArrayList)

ribute("sessionList");

(session);

("销毁一个会话："+());

}

}

程序8.6

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ page import=".* " %>

<%@ taglib prefix="c" uri="/jsp/jstl/core" %>

2023年12月14日发(作者：乐月华)

Java Web编程技术（第2版）

程序1.1

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程序1.2