eclipse，struts2的简单配置及使用，返回json

1.新建一个web项目

2.导入struts2的jar包

http://struts.apache.org/download.cgi#struts25101 官网下载

最基本jar包可以导入

struts-2.3.28\apps\struts2-blank.war

如果需要返回json，加上struts-2.3.28\lib\struts2-json-plugin-2.3.28.jar

3.web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>StrucsProject</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <!--  配置strucs2-->
  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>  
</web-app>
           

4.src下新建struts2.properties 配置常量

可以调用一个action中多个方法

struts.enable.DynamicMethodInvocation=true
           

5.新建pojo类

package com.hello.action;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import com.hello.model.Student;
import com.opensymphony.xwork2.ActionSupport;
public class HelloStruts extends ActionSupport {
    private int id;
    private String name;
    private int other;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getOther() {
        return other;
    }
    public void setOther(int other) {
        this.other = other;
    }
    public HelloStruts(int id, String name, int other) {
        super();
        this.id = id;
        this.name = name;
        this.other = other;
    }

    public HelloStruts() {
        super();
    }
    @Override
    public String toString() {
        return "HelloStruts [id=" + id + ", name=" + name + ", other=" + other
                + "]";
    }
    private static final long serialVersionUID = L;  
    private Map<String,Object> dataMap;  
    public String execute(){
        System.out.println(id);
        System.out.println(name);
        return "cc";
    }

    public String edit(){
        System.out.println("编辑");
        return "edit";
    }
    public String del(){
        System.out.println("删除");
        return "del";
    }
    public void getJson(){
            HttpServletResponse response=ServletActionContext.getResponse();  
            response.setContentType("text/html;charset=utf-8");  
            //response.setCharacterEncoding("UTF-8");  
            PrintWriter out;
            try {
                out = response.getWriter();
                   //JSON在传递过程中是普通字符串形式传递的，这里简单拼接一个做测试  
                String jsonString="{\"user\":{\"id\":\"123\",\"name\":\"张三\",\"say\":\"Hello , i am a action to print a json!\",\"password\":\"JSON\"},\"success\":true}";  
                out.println(jsonString); 
                out.flush();  
                out.close();  
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    }

    public String json(){
        Student student = new Student("liu", );
        dataMap = new HashMap<String, Object>();  
        dataMap.put("cc", student);
        dataMap.put("success", true);
        return "success";
    } 
    public Map<String, Object> getDataMap() {  
        return dataMap;  
    }  
}
           

6.在src下新建struts2.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
    <package name="struts2" extends="struts-default,json-default">
        <action name="HelloStruts" class="com.hello.action.HelloStruts">
            <result name="cc">/indexresult.jsp</result>
            <result name="edit">/indexresult.jsp</result>
            <result name="del">/indexresult.jsp</result>
              <result type="json" name="success">  
                <param name="root">dataMap</param>  
            </result>   
        </action>
    </package>

</struts>
           

7.前台页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<base href="<%=request.getContextPath()%>/" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link href="js/bootstrap/css/bootstrap.min.css" rel="stylesheet" type="text/css"/>
<script src="js/jquery.min.js" type="text/javascript" ></script>
<script src="js/bootstrap/js/bootstrap.min.js" type="text/javascript" ></script>
<title>Insert title here</title>
</head>
<body>
    <div class="contrainer">
    <form id="po" action="HelloStruts!edit.action" method="post">
        <input type="text" name="id">
        <input type="text" name="name">
        <input type="submit" value="submit">
    </form>
    <form id="po" action="HelloStruts!del.action" method="post">
        <input type="text" name="id">
        <input type="text" name="name">
        <input type="submit" value="submit">
    </form>
    <form id="po" action="HelloStruts.action" method="post">
        <input type="text" name="id">
        <input type="text" name="name">
        <input type="submit" value="submit">
    </form> 
    <form id="po" action="HelloStruts!getJson.action" method="post">
        <input type="text" name="id">
        <input type="text" name="name">
        <input type="submit" value="submit">
    </form> 
    <form id="po" action="HelloStruts!json.action" method="post">
        <input type="text" name="id">
        <input type="text" name="name">
        <input type="submit" value="submit">
    </form> 
    </div>

</body>
</html>
           

参考：http://kingxss.iteye.com/blog/1622455