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利用Struts2框架，将后台数据转化为JSON数据并返回到前台

2016-09-22 07:57 435 查看

1、第一步，配置web.xml，配置代码如下

<?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"> 
<filter>  <!--配置struts2过滤器 -->
<!--过滤器名称 -->
<filter-name>struts2</filter-name>
<!--过滤器类 -->
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>

<filter-mapping>
<filter-name>struts2</filter-name>  <!--过滤器名称 -->
<url-pattern>/*</url-pattern>  <!--过滤器映射 -->
</filter-mapping>

<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
</web-app>

2、配置Struts2，注意，配置一般数据时与配置JSON数据时的配置文件不同<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN""http://struts.apache.org/dtds/struts-2.0.dtd"><struts><package name="default" namespace="/" extends="struts-default"><action name="login" class="com.aisino.development.login" method="execute"><result name="success">/JSP/success.jsp</result><result name="fail">/JSP/fail.jsp</result></action>

</package>

<span style="white-space:pre">	</span>//返回JSON数据的配置<package name="json" extends="json-default" namespace="/"><action name="UserTestAction" class="com.aisino.development.UserTestAction" method="Test"><result name="success" type="json"><param name="root">list</param></result></action></package></struts>

3、第三步，编写Action,自己写了两个Action，一个是返回JSON数据的Action，一个是普通页面的Action 普通页面：package com.aisino.development;import com.opensymphony.xwork2.ActionSupport;public class login extends ActionSupport{private String username;private String password;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 String execute() {System.out.println("aaa");if("admin".equals(this.username) && "123".equals(password)){return "success";}else{return "fail";}}} 返回JSON数据页面 package com.aisino.development;import java.util.ArrayList;import java.util.List;import com.opensymphony.xwork2.ActionSupport;public class UserTestAction extends ActionSupport {private List list;public List getList() {return list;}public void setList(List list) {this.list = list;}

<span style="white-space:pre">	</span>//这里所需要的Users类已经定义，定义List集合，将信息存储到集合中public String Test(){Users users=new Users();users.setId(11);users.setName("张三丰");users.setUsername("张三");users.setPassword("123456");list=new ArrayList();list.add(users);return SUCCESS;}}

Users类package com.aisino.development;public class Users {private long id;private String name;private String username;private String password;//切记get、set方法public Users() {super();}public long getId() {return id;}public void setId(long id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}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;}}4，jsp页面<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>登录页面</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"></head><body><center><h2>登录系统</h2><form action="login" method="post">账号：<input type="text" name="username" /><br><br>密码：<input type="password" name="password"/><br><br><input type="submit" value="提交"/><input type="reset" value="重写"/></form></center></script></body></html> 其余两个页面（注：自己编写的，与JSON数据无关）

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>">4000<title>登录成功</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body>账号密码正确 <br></body></html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>登录失败</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body>账号或密码错误 <br></body></html>

5、通过网页查找返回的JSON数据6，结构

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