java web实现自动登录功能

java web实现自动登录功能

本文实例为大家分享了java web实现自动登录功能的具体代码，供大家参考，具体内容如下

主要思路就是：当用户访问网站的首页时，浏览器端会先检擦浏览器中存在的cookie中是否又登录的用户的用户名，如果有，则直接跳转至用户登录好的界面，如果没有，则重定向至登录界面，在服务器端创建该用户登录的cookie,响应时，将创建的cookie返回至浏览器端保存。

一、用户访问首页时检查cookie是否存在。

package ahpudong.com;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HLyrfKttpServletResponse;

@WebServlet("/index.do")

publhttp://ic class index extends HttpServlet {

public index() {

super();

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

Cookie[] cookies=request.getCookies();

if(cookies!=null){

for(Cookie cookie:cookies){

String name=cookie.getName();

String value=cookie.getValue();

if("name".equals(name) && "chendong".equals(value)){

request.setAttribute(name, value);

request.getRequestDispatcher("user.view").forward(request, response);

return;

}

}

}

response.sendRedirect("login.jsp");

}

}

二、确定用户登录的cookie不存在，在手动登录的过程中创建用户登录cookie。

package ahpudong.com;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@WebServlet("/login.do")

public class login extends HttpServlet {

public login() {

super();

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html");

request.setCharacterEncoding("utf-8");

response.setCharacterEncoding("utf-8");

PrintWriter out = response.getWriter();

String name=request.getParameter("name");

String pwd=request.getParameter("pwd");

String login=request.getParameter("auto");

if("chendong".equals(name) && "123456".equals(pwd)){

if("on".equals(login)){

Cookie cookie=new Cookie("name","chendong");

cookie.setMaxAge(7*24*60*60);//有效期为一个星期

response.addCookie(cookie);

request.setAttribute("name",name);

request.getRequestDispatcher("user.view").forward(request, response);

}

}else{

response.sendRedirect("login.jsp");

}

}

}

三、登录成功时的视图层

package ahpudong.com;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@WebServlet("/user.view")

public class User extends HttpServlet {

public User() {

super();

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

processRequest(request,response);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

processRequest(request,response);

}

public void processRequest(HttpServletRequest request,HttpServletResponse response)

throws ServletException, IOException{

response.setCharacterEncoding("utf-8");

PrintWriter out=response.getWriter();

String name=(String) request.getAttribute("name");

out.println(" ");

out.println("");

out.println("

out.println("

out.println("

out.println(" ");

out.println("");

out.flush();

out.close();

}

}

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