struts2之结合ajax

需要引入struts2的struts2-json-plugin-2.5.10.1.jar包

action如下：

package com.action;

import org.apache.struts2.json.annotations.JSON;

import com.bean.User;
import com.opensymphony.xwork2.ActionSupport;
public class JsonAction extends ActionSupport {
	private User user;
	/*
	 * 使用注解方式返回json数据
	 */
	@JSON()
	public User getInputStream() {
		return user;
	}
	public User getUser() {
		user = new User();
		user.setUsername("半仙");
		user.setPassword("123456");
		return user;
	}
	public void setUser(User user) {

		this.user = user;
	}

}

struts.xml配置如下：

在struts.xml中需要引入struts-plugin.xml 文件,

<include file="struts-plugin.xml"></include>

<!--继承默认的json-default  -->
	<package name="user1" extends="json-default">
		<action name="jsonAction" class="com.action.JsonAction">
		<!--结果类型为json -->
			<result type="json">
				<param name="contentType">text/html</param>
			</result>
		</action>
	</package>

struts-plugin.xml文件在struts2的struts2-json-plugin-2.5.10.1.jar这个包下就可以找到

该文件是struts2默认配置好的，拿过来直接用就可以

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

<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
	"http://struts.apache.org/dtds/struts-2.5.dtd">

<struts>
    <package name="json-default" extends="struts-default">

        <result-types>
            <result-type name="json" class="org.apache.struts2.json.JSONResult"/>
            <result-type name="jsonActionRedirect" class="org.apache.struts2.json.JSONActionRedirectResult"/>
        </result-types>

        <interceptors>
            <interceptor name="json" class="org.apache.struts2.json.JSONInterceptor"/>
            <interceptor name="jsonValidation" class="org.apache.struts2.json.JSONValidationInterceptor"/>

            <!-- Sample JSON validation stack -->
            <interceptor-stack name="jsonValidationWorkflowStack">
                <interceptor-ref name="basicStack"/>
                <interceptor-ref name="validation">
                    <param name="excludeMethods">input,back,cancel</param>
                </interceptor-ref>
                <interceptor-ref name="jsonValidation"/>
                <interceptor-ref name="workflow"/>
            </interceptor-stack>

        </interceptors>

    </package>
</struts>

jsp:

<%@ 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 'json.jsp' starting page</title>
  </head>
  <body>
    <form   id="jsonAction" >
    	<input type="text" name="name"/>
    	<input type="button"  value="提交" id="button"/>
    </form>
  </body>
  <script>
  	var jsonAction = document.getElementById("jsonAction");
  	var button = document.getElementById("button");
  	button.onclick= function(){
  		var xhr = new XMLHttpRequest();
  		xhr.onreadystatechange = function(data){
  			if(xhr.readyState==4 && xhr.status==200){
  				var result = xhr.responseText;
  				var json = JSON.parse(result);
  				console.log(json.user);
  			}
  		}
  		xhr.open("post", "jsonAction.action");
  		xhr.send();
  	}
  </script>
</html>

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