JS代码：
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<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html> <head>
<script type="text/javascript" src="jquery-1.4.2.js"></script>
<script type="text/javascript">
function jj(){
$.ajax({
url: 'AjaxServlet', //提交的地址
type: 'post', //提交方式
dataType: 'XML', //数据的类型,XML、text，注意XML是大写的
error: function(){ //出现异常时调用回调函数
alert('无法返回正确的数据');
},
//当成功返回数据时进行的操作，
//如果前面dataType设置了XML,那么参数xml是XML文档的内容
//如果前面dataType设置了text,那么参数xml是字符串
success: function(xml){
//解析XML跟解析HTML差不多，获取文本值时最好用text(),因为有些jquery版本不支持html()解析XML
alert($("b",xml).text());
$("info",xml).each(function(){
alert($(this).text());
});
}
});
}
</script>
</head>
<body>
<div>
<input type="button" value="点击进入ajax" onclick="jj();"/>
</div>
</body>
</html> |
Servlet代码：
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package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class AjaxServlet extends HttpServlet {
public AjaxServlet() {
super();
}
public void destroy() {
super.destroy();
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 这里响应类型必须是text/xml
response.setContentType("text/xml;charset=gbk");
request.setCharacterEncoding("gbk");
PrintWriter out = response.getWriter();
// XML头，没有这个可能Javascript解析不出XML，最好设一下
StringBuilder sb = new StringBuilder("<?xml version=\"1.0\" encoding=\"gbk\"?>");
// 根元素<root></root>一定需要，否则Javascript解析不出XML，但名字不一定要叫root
sb.append("<root><info id='1'><b>a</b></info ><info id='1'>b</info><memo id='2'>c</memo><memo>d</memo></root>");
//写出XML
out.println(sb.toString());
out.flush();
out.close();
}
public void init() throws ServletException {}
} |