Ajax局部刷新应用案例---简单登录

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 TestA extends HttpServlet {

private static final long serialVersionUID = -7999241892841130740L;

protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String name = request.getParameter("name");

response.setContentType("text/xml; charset=utf-8");
response.setHeader("Cache-Control", "no-cache");
PrintWriter out = response.getWriter();
out.println("");
if (name.equals("yangjinde")) {
out.println("" + "对不起,'yangjinde'此名已经注册" + "");
} else {
out.println("" + "可以注册哦" + "");
}
out.println("");
out.close();
}
}

2.jsp代码：
复制代码 代码如下:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>