checkservlet.java

一个培训时候的ajax学习例子 很有用的。兄弟们可以试试。ajax级联菜单的实现以及频聊功能的实现。

package com.briup.web;

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 CheckServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");
		response.setContentType("text/html");
		String username
		=request.getParameter("username");
		try {
			Thread.currentThread()
							.sleep(2000);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		PrintWriter pw=response.getWriter();
		if(username.equals("briup")){
			pw.println("用户名已经被占用!");
		}else{
			pw.println("可以使用此用户名!");
		}
		pw.flush();
		pw.close();
	}

}