loginservlet.java

一个JAVA的小例子 大家不放运行一下 熟悉一下

package com.abc.dl.servlets;

import java.io.*;

import javax.servlet.*;
import javax.servlet.http.*;

public class LoginServlet extends HttpServlet {

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		String username = request.getParameter("username");
		String password = request.getParameter("password");
		
		if(username != null && password !=null && username.equals(password)) {
			HttpSession session = request.getSession();
			session.setAttribute("login", "true");
			request.getRequestDispatcher("/servlet/main.html").forward(request, response);
			return;
		}
		
		request.setCharacterEncoding("gb2312");
		response.setContentType("text/html;charset=gbk");
		//response.setHeader("Content-type","text/html")   //设置header
		//response. _________("Pragma", "no-cache");      //设置header信息
		//response. __________ ("Cache-control", "no-cache"); 
		//response.setDateHeader("Expires",0);   //设置时间header
        //response._________; //该servlet组件输出image/jpeg类型文档
		
		
		PrintWriter out = response.getWriter();
		HttpSession session = request.getSession();
		session.setAttribute("login", "false");
		request.getRequestDispatcher("/login.html").include(request, response);
		out.println("Please check and refill the form.");
	}

}