jsp EL(3)

来源：互联网发布：国家公派留学博士知乎编辑：程序博客网时间：2024/05/16 06:46

/**

* File: Profile.java

* Author: huaxuhe

* Function: 用户详细信息类

package com.huaxuhe.jspel;

import java.util.Map;

public class Profile {

private Map<String, String> phone;// 电话

private Address[] address;// Address instance

private String birthDate;// 生日

private String email;// 邮箱

// default constructed function

public Profile() {

}

// Getter and Setter method

public Map<String, String> getPhone() {

return phone;

}

public void setPhone(Map<String, String> phone) {

this.phone = phone;

}

public Address[] getAddress() {

return address;

}

public void setAddress(Address[] address) {

this.address = address;

}

public String getBirthDate() {

return birthDate;

}

public void setBirthDate(String birthDate) {

this.birthDate = birthDate;

}

public String getEmail() {

return email;

}

public void setEmail(String email) {

this.email = email;

}

/**

* File: User.java

* Author: huaxuhe

* Function: 用户类

package com.huaxuhe.jspel;

public class User {

private int id;// 编号

private String username;// 用户名

private String password;// 密码

private Profile profile;// Profile instance

// default constructed function

public User() {

}

// Getter and Setter method

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public Profile getProfile() {

return profile;

}

public void setProfile(Profile profile) {

this.profile = profile;

}

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@ page import="com.huaxuhe.jspel.*"%>

<html>

<head>

<title>jspel</title>

</head>

<body>

<jsp:useBean id="user" class="com.huaxuhe.jspel.User"/>

<jsp:setProperty name="user" property="id" value="1"/>

<jsp:setProperty name="user" property="username" value="huaxuhe"/>

<jsp:setProperty name="user" property="password" value="java"/>

Profile profile = new Profile();

profile.setEmail("huaxuhe@126.com");

profile.setBirthDate("11-13");

Map<String, String> phone = new HashMap<String, String>();

phone.put("handset", "20080808");

profile.setPhone(phone);

Address address = new Address();

address.setAddr("WuChang");

address.setCity("WuHan");

address.setCountry("China");

address.setPostCode("10000");

Address[] addresses = {address};

profile.setAddress(addresses);

user.setProfile(profile);

pageContext.setAttribute("username", null);

pageContext.setAttribute("password", "");

pageContext.setAttribute("title", "The Way Of Java");

pageContext.setAttribute("time", new java.util.Date());

${user.id}<br>

${user.username}<br>

${user.password}<br>

${user.profile.phone.handset}<br>

${user.profile.birthDate}<br>

${user.profile.email}<br>

${user.profile.address[0].postCode}<br>

${user.profile.address[0].country}<br>

${user.profile.address[0].city}<br>

${user.profile.address[0].addr}<br>

</body>

</html>

5.JSP EL中的内置对象

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5"

xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<context-param>

<param-name>name</param-name>

<param-value>huali</param-value>

</context-param>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

</web-app>

index.jsp

<%@ page language="java" pageEncoding="UTF-8"%>

<html>

<head>

<title>jspel</title>

</head>

<body>

</select>

<br>

Learnning language:

<input type="checkbox" name="language" value="Java"/>Java

<input type="checkbox" name="language" value="C"/>C

<input type="checkbox" name="language" value="C#"/>C#

<br>

</form>

</body>

</html>

jspel.jsp

<%@ page language="java" pageEncoding="UTF-8"%>

<html>

<head>

<title>jspel</title>

</head>

<body>

pageContext.setAttribute("name", "huali");

request.setAttribute("name", "huabang");

session.setAttribute("name", "huajun");

application.setAttribute("name" ,"huaxuhe");

${pageScope.name}<br>

${requestScope.name}<br>

${sessionScope.name}<br>

${applicationScope.name}<br>

${name}<br>

response.addCookie(new Cookie("space", "The Way Of Java"));

${cookie.space.value}<br>

${header.host}<br>

${header["user-agent"]}<br>

${param.gander}<br>

${paramValues.language[0]}<br>

${initParam.name}<br>

</body>

</html>