struts2实现ajax的两种方式

 

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 'index.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/jquery1.8.3.js" ></script>
    
    <script>
        function testAjax(){
            var username=$("#ajax_username").val();
            $.post(
            "Test_ajax2.action",
            {username:username},
            function(date){
                    alert(date);
                }
            );
        }
    </script>
  </head>
  
  <body>
    <input type="text" id="ajax_username"><button onclick="testAjax()" >提交</button>
  </body>
</html>

 

struts.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>

    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    <constant name="struts.devMode" value="true" />
    <constant name="struts.i18n.encoding" value="utf-8"/>
    
    <package name="example" namespace="/">
        <action name="*_*" class="com.web.action.{1}Action" method="{2}">
        </action>
    </package>
    
    <package name="example1" namespace="/" extends="json-default">
        <action name="Test_ajax2" class="com.web.action.TestAction" method="ajax2">
        </action>
    </package>

</struts>

 

TestAction.java:

package com.web.action;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class TestAction extends ActionSupport {
    private String username;

    public void setUsername(String username) {
        this.username = username;
    }

    public void ajax() throws IOException{
        HttpServletResponse response=ServletActionContext.getResponse();
        response.setContentType("text/html; charset=utf-8");
        PrintWriter writer=response.getWriter();
        
        //只有这样才可以获取到值，不写下面这行代码username的值为null
        this.username=ServletActionContext.getRequest().getParameter("username");
        
        writer.print("hello,"+username);
        writer.flush();
        writer.close();
    }
    
    public void ajax2() throws IOException{
        System.out.println(1);
        HttpServletResponse response=ServletActionContext.getResponse();
        response.setContentType("text/html; charset=utf-8");
        PrintWriter writer=response.getWriter();
        writer.print("hello,"+username);
        writer.flush();
        writer.close();
    }

}

 

第一种方式使用的方法是我的方法ajax()，但是使用这种方式的时候：ajax和request耦合，使用Action无法自动为username属性注入值。我暂时不知道为什么，有知道原因的告诉下，谢谢！

 

第二种方式使用的是方法ajax2(),这种方式的的前提是使用插件：

也就是struts中需要导入jar：

然后你的package必须继承json-default

这样你的Action就可以为ajax参数自动赋值了。

 

posted @ 2016-10-08 15:14  guodaxia  阅读(176)  评论(0)  编辑  收藏  举报