问题描述

如何用Ajax传递一个对象集合到jsp页面。

我想在我的web项目（struts2+hibernate）的首页的页面输出数据库的News这个表的内容，请问具体的代码是怎样的，我都快点疯了。

---

附我自己写的代码，及供参考，可忽略

在servlet中：
public void getNewsList(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("application/xml"); // 设置响应类型为XML
response.setCharacterEncoding("GBK"); //设置响应的编码方式
PrintWriter out = response.getWriter();
ConnDB conn=new ConnDB();
String sql="SELECT * FROM News";
ResultSet rs=conn.executeQuery(sql); //
List newsList=new ArrayList();
try {
News n=new News();
while(rs.next()){
n.setId(rs.getInt("id"));
n.setTitle(rs.getString("title"));
newsList.add(n);
}
} catch (SQLException e) {
e.printStackTrace();
}
conn.close(); //
/****************通过Dom4j将获取的最新用户信息输出到XML文档中****************/
Document document = DocumentHelper.createDocument();
Element returnValue= document.addElement("returnValue");
document.setRootElement(returnValue); // 将returnValue设置为根节点
Element e_newsList=returnValue.addElement("NewsList"); //添加newUser节点
e_newsList.setData(newsList);
XMLWriter output;。。。。。
output.flush();
}
在JSP页面中：
javascript中：
function getUserInfo(){
var loader_List=new net.AjaxRequest("NewsListServlet?action=getNewsList&nocache="+new Date().getTime(),deal_getNewsList,onerror,"GET");//实例化Ajax对象
}
function deal_getNewsList(){
var objXml=this.req.responseXML; //获取返回的XML数据
var newsList = objXml.getElementsByTagName("newsList")[0].firstChild.data; //获取
document.getElementById("newsList").innerHTML=newsList; //显示
}
timer=window.setInterval(getUserInfo,60000); //每隔1分钟获取一次

解决方案

public void getNewsList(HttpServletRequest request,
 HttpServletResponse response) throws ServletException, IOException {
 response.setContentType("application/xml"); // 设置响应类型为XML
 response.setCharacterEncoding("GBK"); //设置响应的编码方式
PrintWriter out = response.getWriter();
 ConnDB conn=new ConnDB();
 String sql="SELECT * FROM News";
 ResultSet rs=conn.executeQuery(sql); //
 List newsList=new ArrayList();
 try {
 News n=new News();
 while(rs.next()){
 n.setId(rs.getInt("id"));
 n.setTitle(rs.getString("title"));
 newsList.add(n);
 }
 } catch (SQLException e) {
 e.printStackTrace();
 }
 conn.close(); //
 response.setHeader("cache-control","no-cache");
                PrintWriter out=response.getWriter();
            out.print("<?xml version='1.0' encoding='UTF-8'?>");
                                out.print("<root>");
for(int i=0;i<newList.size();i++){
out.print("<NewList>");
out.print("<Id>")
out.print(newList.get(i).getId());
out.print("</Id>");
out.print("<Title>");
out.print(newList.get(i).getTitle());
out.print("</Title>");
out.print("</NewList>");

}
out.print("</root>");
out.flush;
out.close;