jquery+struts+json

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JSP页面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>

<SCRIPT type="text/javascript">

     function clickButton2(){
     $.ajax({
    url: 'ajaxRequest?'+Math.random(),//此处Math.random()避免浏览器缓存，ajaxRequest是action
    type: 'get',
    dataType: 'json',
    data:{"bj":$("#bj").val(),"xm":$("#xm").val()},//此处向服务器action：ajaxRequest传数据
    error: function(){
        alert('Error');
    },
    success: function(data){
      for(var dd in data){
          alert(data[dd].name);//这里返回的数据可以用jquery生成表格形式

}
}
});

}

</SCRIPT>

</head>
<body>
班级：<br/>
<input id="bj" type="text">
姓名:<br/>
<input id="xm" type="text">
<input type="button" value="ok" onclick="clickButton2();">

</body>
</html>

Book类（省略getter、setter）：

public class Book {
    private int id;
    private String name;
    private int categoryId;

...............

//省略getter、setter

}

ACTION 类：

public class HelloWorld extends ActionSupport {

      public void execute2() {
      HttpServletRequest rq=ServletActionContext.getRequest();
     String bj=rq.getParameter("bj");
     String xm=rq.getParameter("xm");

         HttpServletResponse response =ServletActionContext.getResponse();
         response.setCharacterEncoding("UTF-8");
         Book bk=new Book();
         bk.setId(1);
         bk.setCategoryId(1);
         bk.setName("good");
         Map<String,Object> mp=new HashMap<String, Object>();
         mp.put("li1", bk);
         Book bk2=new Book();
         bk2.setId(2);
         bk2.setCategoryId(3);
         bk2.setName(bj+"===我放入"+xm);
         mp.put("li2", bk2);

         JSONObject jsr=JSONObject.fromObject(mp);//返回的是json对象

        //JSONArray jsr= JSONArray.fromObject(mp);//如果用数字形式返回要注意客户端首先也要以数组形式调用d[0]，后再以属性方式访问

   try {
          //这里向页面返回数据
      PrintWriter out = response.getWriter();
     out.println(jsr);

       //这里主要为了在服务器端输出测试
      System.out.println(jsr);

   } catch (IOException e) {
    // TODO Auto-generated catch block
      e.printStackTrace();
   }


     }

}

struts.xml文件（部分）：