效果如下：
服务器端
package com.ljq.test;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import java.io.IOException;
import java.io.PrintWriter;
/**
* 利用jQuery接受和处理xml数据
*
* @author jiqinlin
*
*/
@SuppressWarnings(“serial”)
public class AjaxXmlServer extends HttpServlet{
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
try{
//修改一—-响应的Content-Type必须是text/xml
response.setContentType(“text/xml;charset=utf-8”);
PrintWriter out = response.getWriter();
//1.取参数
String old = request.getParameter(“name”).trim();
//修改二—–返回的数据需要拼装成xml格式
StringBuilder builder = new StringBuilder();
builder.append(“<message>”);
//2.检查参数是否有问题
if(old == null || “”.equals(old)){
builder.append(“用户名不能为空”).append(“</message>”);
} else{
//3.校验操作
String name = old;
if(name.equals(“linjiqin”)){
builder.append(“用户名[” + name + “]已经存在，请使用其他用户名”).append(“</message>”);
} else{
builder.append(“用户名[” + name + “]尚未存在，可以使用该用户名注册”).append(“</message>”);
}
out.println(builder.toString());
System.out.println(builder.toString());
}
} catch(Exception e){
e.printStackTrace();
}
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
修改web.xml
<servlet>
<servlet-name>AjaxXmlServer</servlet-name>
<servlet-class>com.ljq.test.AjaxXmlServer</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>AjaxXmlServer</servlet-name>
<url-pattern>/servlet/ajaxXmlServer</url-pattern>
</servlet-mapping>
请求页面
<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”
“http://www.w3.org/TR/html4/loose.dtd”>
<html>
<head>
<script type=”text/javascript” src=”http://localhost:8083/jqueryprj/js/jquery-1.3.1.js”></script>
<script type=”text/javascript” src=”http://localhost:8083/jqueryprj/js/verifyjqueryxml.js”></script>
