利用Struts2框架，将后台数据转化为JSON数据并返回到前台

时间：2021-09-26 08:13:05
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>
    <!--声明包-->
    <package name="default" namespace="/" extends="struts-default">
    <!--定义action -->
     <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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
  </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%>">

    <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 




利用Struts2框架，将后台数据转化为JSON数据并返回到前台
6，结构
 

利用Struts2框架，将后台数据转化为JSON数据并返回到前台


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