/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */package cn.edu.hit;import java.io.IOException;import java.io.PrintWriter;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * * @author dell */public class LoginServlet extends HttpServlet{ /** * Processes requests for both HTTP <code>GET</code> and <code>POST</code> * methods. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ response.setContentType("text/html.charset=UTF-8");//设置源文本类型 try(PrintWriter out =response.getWriter()){//捕获异常 String username=request.getParameter("username");//获取参数 String password=request.getParameter("password");//获取参数 Class.forName("com.mysql.jdbc.Driver");//启动驱动 Connection con = DriverManager.getConnection("jdbc:mysql:你的服务器地址。","你的服务器登陆名","你的服务器密码");//建立一个连接 Statement stmt = con.createStatement();//描述符。 ResultSet rs=stmt.executeQuery("select * from users where username=‘"+username+"‘and password=‘"+password+"‘");//在数据库查找。 if(rs.next()){//假如找到了 out.print("success");//打印成功。 } else{//不然就打印fail out.print("fail!"); } con.close();//关闭连接。 } catch(Exception e)//捕获异常的catch框 { e.printStackTrace(); } } /** * Handles the HTTP <code>GET</code> method. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Handles the HTTP <code>POST</code> method. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Returns a short description of the servlet. * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// </editor-fold>}