jQuery.Post到Struts2的action处理，并返回json对象到前端

来源：互联网发布：淘宝如何改主营类目编辑：程序博客网时间：2024/05/21 17:23

之前虽然一直在用jQuery.post函数，将前端页面的请求发送到struts中的action处理，但是用的是公司写好的一套东西，基本都是复制粘贴，反而对基本的post功能没有深入了解。下面简单配置说明action中接收处理post的请求。

用的是struts2，web.xml配置如下

<?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">  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list>  <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>

struts.xml中配置了一个action,配置如下

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"><struts><package name="com.test.action"><action name="logon" class="com.test.action.LogonAction"></action></package></struts>

index.jsp发送post请求，指定返回数据格式为json。

post的URL写了两种类型：一种是直接发送到jsp中处理，另外一种是发送到action中处理

<%@ 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"><script type ="text/javascript" src = "zipedJquery.js"></script><!-- jQuery-min.js --><script type ="text/javascript">var jq = jQuery.noConflict();jq(document).ready(function(){jq("#btn").click(function(){//post到jsp中处理var username = jq("#username").val();var password = jq("#password").val();jq.post("MyJsp.jsp",  {    "username":username,    "password":password  },  function(data,status){    alert("appTime: " + data["appTime"] );  },  "json" );  });jq("#btn1").click(function(){    //post到action中处理var username = jq("#username").val();var password = jq("#password").val();jq.post("logon",{"method":"post"  //传递参数},function(data,status){alert(data);var msg ="returnCode: " + data["returnCode"] +"&returnMsg：" + data["returnMsg"]+"&appTime："+ data["appTime"];alert(msg);      },  "json");});  });</script>  </head>    <body>    This is my JSP page. <br>     <form action="logon" method="post"  >    用户名：<input type ="text" name ="username" id ="username" value="" /><br/>    密    码：<input type ="password" name ="password" id ="password" value="" /><br/>    <input type= "submit"  value="提交" />    </form>      <br/>     <button id= "btn" title = "post to MyJsp">MyJsp</button>    <button id= "btn1" title = "post to PostAction">PostAction</button><br/>     </body></html>

MyJsp.jsp中处理post请求，用request.getParameter()获取参数，再用response将组织好的json格式的字符串返回。

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@page import="java.text.SimpleDateFormat"%><%    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 'MyJsp.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">    </head>    <body>        This is my JSP page.        <br>        <%            String username = request.getParameter("username");            String password = request.getParameter("password");            String json = "";            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");            if ("Duck".equals(username)) {                json = "{\"appTime\":\"" + sdf.format(new java.util.Date())+ "\"}";            } else {                json = "{\"appTime\":\"\"}";            }            response.getWriter().write(json);            response.getWriter().flush();            response.getWriter().close();        %>    </body></html>

PostAction处理post请求，以前用的是struts1.2，action中的execute方法中的有request和response参数，struts2里面需要自己去获取

package com.test.action;import java.io.PrintWriter;import java.text.SimpleDateFormat;import javax.servlet.ServletContext;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;public class LogonAction extends ActionSupport {/** *  */private static final long serialVersionUID = 1L;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() throws Exception {// TODO Auto-generated method stubSystem.out.println(getUsername()); System.out.println(getPassword());                //获取response和request对象HttpServletResponse response = (HttpServletResponse) ActionContext.getContext().get(org.apache.struts2.StrutsStatics.HTTP_RESPONSE);HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(org.apache.struts2.StrutsStatics.HTTP_REQUEST);System.out.println(request.getParameter("method"));String json = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");if ("Duck".equals(username)) {json = "{\"returnCode\":\"1\",\"returnMsg\":\"Success\",\"appTime\":\"" + sdf.format(new java.util.Date()) + "\"}";} else {json = "{\"returnCode\":\"0\",\"returnMsg\":\"Failed\",\"appTime\":\"" + sdf.format(new java.util.Date()) + "\"}";}response.getWriter().write(json);  //返回jsonresponse.getWriter().flush();response.getWriter().close();return null;}}

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