action处理Ajax请求

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action有3种方式处理Ajax请求：

（1）跟servletAPI耦合的方式：借助response流获取out来完成；

（2）借助Stream结果类型，跟servlet API解耦合方式；

   1-给result指定type=stream
     <result type="stream">
               <param name="contentType">test/html;charset=utf-8</param>
               <param name="inputName">is</param>
           </result>

2-action中：is = new ByteArrayInputStream(str.getBytes("utf-8"));

（3）struts内置的json插件；

     1-.导入：struts2-json-plugin-2.3.20.jar
     2-后台：直接给action定义属性，然后给属性赋值即可
     public String testjson(){
       this.p = new Person();
       p.setId(2);
       p.setName("zhangsan");
       return SUCCESS;
   }
   3-配置：
       1-package----继承json-default包
       2-action---result---type：json
          1-result中不需要写相应的资源url

具体实例：

<%@ 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>My JSP 'testajax.jsp' starting page</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">-->  <script type="text/javascript" src="jquery-1.9.1.js"></script>  <script type="text/javascript">  $(function(){  $("#b1").click(function(){  $.post('testajax','',function(data){  alert(data);  },'text');  });  $("#b2").click(function(){  $.post('testajax1','',function(data){  alert(data.name);  },'json');  });  $("#b3").click(function(){  $.post('json/testajax3','',function(data){  alert(data.name);  alert("p.id="+data.p.id+",p.name"+data.p.name);  },'json');  });  });  </script>  </head>    <body>    <button id="b1">耦合servletapi</button><br>    <button id="b2">stream结果类型</button><br>    <button id="b3">struts2内置json</button><br>  </body></html>

Struts.xml配置：

<?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>    <constant name="struts.enable.DynamicMethodInvocation" value="false" />    <constant name="struts.devMode" value="true" />    <package name="default" namespace="/" extends="struts-default">        <interceptors>    <interceptor name="myInter" class="com.interceptors.MyInter"/>    <interceptor-stack name="abc">    <interceptor-ref name="defaultStack"></interceptor-ref>    <interceptor-ref name="tokenSession"></interceptor-ref>    <interceptor-ref name="myInter"></interceptor-ref>    </interceptor-stack>    <action name="testajax"     class="com.handler.AjaxAction"     method="testajax">    </action>        <action name="testajax1" class="com.handler.AjaxAction" method="testajax1">    <result type="stream">    <param name="contentType">test/html;charset=utf-8</param>    <param name="inputName">inputStream</param>    </result>    </action>    </package>     <package name="json" namespace="/json" extends="json-default">     <action name="testajax3" class="com.handler.AjaxAction" method="testjson">     <result type="json"></result>     </action>     </package></struts>

action域：

package com.handler;import java.io.ByteArrayInputStream;import java.io.InputStream;import java.io.PrintWriter;import javax.servlet.http.HttpServletResponse;import org.apache.struts2.ServletActionContext;import com.bean.Person;import com.google.gson.Gson;import com.opensymphony.xwork2.ActionSupport;public class AjaxAction extends ActionSupport {public String testajax()throws Exception{HttpServletResponse response = ServletActionContext.getResponse();PrintWriter out = response.getWriter();out.print("hello");out.flush();out.close();return NONE;}private InputStream inputStream;public InputStream getInputStream() {return inputStream;}public String testajax1()throws Exception{Person p = new Person();p.setId(1);p.setName("李四");Gson g = new Gson();String str = g.toJson(p);inputStream = new ByteArrayInputStream(str.getBytes("utf-8"));return SUCCESS;}private Person p;public Person getP() {return p;}public void setP(Person p) {this.p = p;}private String name;public String getName() {return name;}public void setName(String name) {this.name = name;}public String testjson(){this.p = new Person();p.setId(2);p.setName("zhangsan");this.name = "abc";return SUCCESS;}}

运行结果：

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