配置自动登录代码

1 编制登录页面

新建jsp文件在文件中设置用户登录表单，测试代码如下：

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



  
    
    
    
    
    
    
        
    
    
    

  
  
  
     

      

        

          
username:
          

        
        

          
Password:
          

        
 
        

          
autologin:
          

        
 
        

          

        
      
    
  

通过此方式获取系统共享内容

2 编写表单处理页面

新建servlet，读取用户名及密码根据auto选项判断是否写入cookie，测试代码如下：

package CLASS;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginServlet extends HttpServlet {

    /**
         * Constructor of the object.
         */
    public LoginServlet() {
        super();
    }

    /**
         * The doGet method of the servlet. 

         *
         * This method is called when a form has its tag value method equals to get.
         * 
         * @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 doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String auto =request.getParameter("autologin");
        
        String username =request.getParameter("username");
        String password = request.getParameter("password");
        if(auto!=null&&auto.equals("1")){
            Cookie c = new Cookie("username",username);
            Cookie c2 = new Cookie("password",password);
            c.setMaxAge(60*60);
            c2.setMaxAge(60*60);
            c2.setSecure(false);
            c.setSecure(false);
            response.addCookie(c);
            response.addCookie(c2);
        }
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("");
        out.println("");
        out.println("  ");
        out.println("  ");
        out.println("welcome "+username);
        out.println("***********************");
        out.println("  ");
        out.println("");
        out.flush();
        out.close();
    }

    /**
         * The doPost method of the servlet. 

         *
         * 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 {

        doGet(request,response);
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("");
        out.println("");
        out.println("  ");
        out.println("  ");
        out.print("    This is ");
        out.print(this.getClass());
        out.println(", using the POST method");
        out.println("  ");
        out.println("");
        out.flush();
        out.close();
    }

}

3 编写自动登录页

读取用户本地cookie，如果本地找到对应cookie就将cookie内容带入到用户名密码处。测试代码如下：

package CLASS;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginServlet extends HttpServlet {

    /**
         * Constructor of the object.
         */
    public LoginServlet() {
        super();
    }

    /**
         * The doGet method of the servlet. 

         *
         * This method is called when a form has its tag value method equals to get.
         * 
         * @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 doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String auto =request.getParameter("autologin");
        
        String username =request.getParameter("username");
        String password = request.getParameter("password");
        if(auto!=null&&auto.equals("1")){
            Cookie c = new Cookie("username",username);
            Cookie c2 = new Cookie("password",password);
            c.setMaxAge(60*60);
            c2.setMaxAge(60*60);
            c2.setSecure(false);
            c.setSecure(false);
            response.addCookie(c);
            response.addCookie(c2);
        }
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("");
        out.println("");
        out.println("  ");
        out.println("  ");
        out.println("welcome "+username);
        out.println("***********************");
        out.println("  ");
        out.println("");
        out.flush();
        out.close();
    }

    /**
         * The doPost method of the servlet. 

         *
         * 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 {

        doGet(request,response);
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("");
        out.println("");
        out.println("  ");
        out.println("  ");
        out.print("    This is ");
        out.print(this.getClass());
        out.println(", using the POST method");
        out.println("  ");
        out.println("");
        out.flush();
        out.close();
    }

}