1.所需jar包如下所示。其中选中的四个包是struts2实现ajax所必需的，所有的jar包都可以从下载的完整的struts2 包中的lib文件夹中找到。
2.Demo
struts2ajax.jsp
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <%@taglib uri="/struts-tags" prefix="s"%> 4 <%@ taglib prefix="sx" uri="/struts-dojo-tags"%> 5 6 7 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 9 <html> 10 <head> 11 12 13 <title>My JSP 'index.jsp' starting page</title> 14 <meta http-equiv="pragma" content="no-cache"> 15 <meta http-equiv="cache-control" content="no-cache"> 16 <meta http-equiv="expires" content="0"> 17 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 18 <meta http-equiv="description" content="This is my page"> 19 <script type="text/javascript" src="<%=request.getContextPath() %>/js/jquery.min.js"></script> 20 <script type="text/javascript" src="<%=request.getContextPath() %>/js/index.js"></script> 21 22 <!-- <s:head theme="ajax" />这句话好像没影响哦 --> 23 <!-- <s:head theme="ajax" />--> 24 <!--在jsp页面上加入<s:head theme="ajax" />会报如下异常：java.io.FileNotFoundException: 25 Template /template/ajax/head.ftl not found. 26 解决办法：在struts2-core-2.1.8.jar/template目录下加入ajax文件夹，ajax文件夹所在目录为 27 struts2-core-2.1.8.jar/template/archive。 28 注意：ajax文件夹下要包含head.ftl，否则还是会抛异常。head.ftl请在template目录搜索然后放到ajax文件夹里 29 --> 30 <sx:head debug="true" parseContent="false"/> 31 </head> 32 33 <body> 34 <!-- 显示User实体对象 --> 35 <div id="result"></div> 36 <s:form name="userForm" action="/jsonAction.do" method="post"> 37 <s:hidden name="articleId"></s:hidden> 38 编号：<input name="user.id"/><br/> 39 用户名：<input name="user.username"/><br/> 40 密码：<input name="user.pwd"/><br/><br/> 41 <input id="btn" type="button" value=" 提 交 "/> 42 </s:form> 43 44 45 </body> 46 </html>
index.js
$(document).ready(function(){
//点击提交按钮时，从服务端获取数据，然后在客户端显示
$("#btn").click(function(){
// 序列化表单的值
var params=$("input").serialize();
$.ajax({
url: "jsonAction.do",
// 数据发送方式
type: "post",
// 接受数据格式
dataType : "json",
// 要传递的数据
data : params,
// 回调函数，接受服务器端返回给客户端的值，即result值
success : show
});
});
});
function show(result){
//测试result是否从服务器端返回给客户端
//alert(result);
//解析json对象
var json = eval("("+result+")");
var obj = "编号: "+json.id+" 用户名: "+json.username+" 密码: "+json.pwd+" articleId: "+json.articleId;
$("#result").html(obj);
//alert(json.articleId);
}
User.java
package com.blgs.bean;
import java.io.Serializable;
public class User implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private int id;
private String username;
private String pwd;
private String articleId;
public void setArticleId(String articleId) {
this.articleId = articleId;
}
public String getArticleId() {
return articleId;
}
public User() {
}
public User(int id, String username, String pwd) {
super();
this.id = id;
this.username = username;
this.pwd = pwd;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
}
GotoStruts2ajax .java
package com.blgs.action;
import com.opensymphony.xwork2.ActionSupport;
public class GotoStruts2ajax extends ActionSupport {
private static final long serialVersionUID = 1L;
private String articleId;
public void setArticleId(String articleId) {
this.articleId = articleId;
}
public String getArticleId() {
return articleId;
}
@Override
public String execute() throws Exception {
// TODO Auto-generated method stub
this.articleId="201609001";
return SUCCESS;
}
}
JsonAction.java
package com.blgs.action;
import com.blgs.bean.User;
import com.opensymphony.xwork2.ActionSupport;
import net.sf.json.JSONObject;
@SuppressWarnings("serial")
public class JsonAction extends ActionSupport {
private User user;
// 返回结果给客户端
private String result;
private String articleId;
public void setArticleId(String articleId) {
this.articleId = articleId;
}
public String getArticleId() {
return articleId;
}
public String execute() throws Exception {
user.setArticleId(articleId);
//将要返回的实体对象进行json处理
JSONObject json=JSONObject.fromObject(user);
//输出格式如：{"id":1, "username":"zhangsan", "pwd":"123"}
System.out.println(json);
result=json.toString();
return SUCCESS;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public String getResult() {
return result;
}
public void setResult(String result) {
this.result = result;
}
}
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> <!-- 该属性指定需要Struts2处理的请求后缀，该属性的默认值是action，即所有匹配*.action的请求都由Struts2处理。 如果用户需要指定多个请求后缀，则多个后缀之间以英文逗号（,）隔开。 --> <constant name="struts.action.extension" value="do" /> <!-- 设置浏览器是否缓存静态内容,默认值为true(生产环境下使用),开发阶段最好关闭 --> <constant name="struts.serve.static.browserCache" value="false" /> <!-- 当struts的配置文件修改后,系统是否自动重新加载该文件,默认值为false(生产环境下使用),开发阶段最好打开 --> <constant name="struts.configuration.xml.reload" value="true" /> <!-- 开发模式下使用,这样可以打印出更详细的错误信息 --> <constant name="struts.devMode" value="true" /> <!-- 默认的视图主题 --> <!-- <constant name="struts.ui.theme" value="simple" /> --> <!-- <constant name="struts.objectFactory" value="spring" /> --> <package name="test" extends="json-default"> <action name="jsonAction" class="com.blgs.action.JsonAction"> <result type="json"> <!-- 此处将reslut的值返回给客户端，root的值对应要返回的值的属性result 注意：root为固定写法，否则不会把result的值返回给客户端 --> <param name="root">result</param> </result> </action> </package> <package name="index" extends="struts-default"> <action name="indextoajax" class="com.blgs.action.GotoStruts2ajax"> <result>struts2ajax.jsp</result> </action> </package> </struts>