本文实例讲述了Java Web基于Session的登录实现方法。分享给大家供大家参考,具体如下:
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package cn.com.login; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class Login extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncoding( "UTF-8" ); response.setContentType( "text/html;charset=UTF-8" ); String userName=request.getParameter( "userName" ); String password=request.getParameter( "password" ); PrintWriter out=response.getWriter(); List<User> list=Db.getAll(); for (User user:list) { if (user.getUserName().equals(userName)&&user.getPassword().equals(password)) { request.getSession().setAttribute( "user" , user); response.sendRedirect( "/Session/index.jsp" ); return ; } } out.write( "用户名或者密码错误!" ); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } } class Db { public static List<User> list= new ArrayList(); static { list.add( new User( "aaa" , "123" )); list.add( new User( "bbb" , "123" )); list.add( new User( "ccc" , "123" )); } public static List<User> getAll() { return list; } } package cn.com.login; public class User { private String userName; private String password; public User() { super (); // TODO Auto-generated constructor stub } public User(String userName, String password) { super (); this .userName = userName; this .password = password; } public String getUserName() { return userName; } public void setUserName(String userName) { this .userName = userName; } public String getPassword() { return password; } public void setPassword(String password) { this .password = password; } } package cn.com.login; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; /** * Servlet implementation class LogOut */ public class LogOut extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession session=request.getSession( false ); if (session== null ) { response.sendRedirect( "/Session/index.jsp" ); return ; } session.removeAttribute( "user" ); response.sendRedirect( "/Session/index.jsp" ); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } } <!DOCTYPE html> <html> <head> <title>Index.html</title> <meta http-equiv= "keywords" content= "keyword1,keyword2,keyword3" > <meta http-equiv= "description" content= "this is my page" > <meta http-equiv= "content-type" content= "text/html; charset=UTF-8" > <!--<link rel= "stylesheet" type= "text/css" href= "./styles.css" >--> </head> <body> <form action= "/Session/Login" > 用户名:<input type= "text" name= "userName" /><br/> 密码:<input type= "password" name= "password" /><br/> <input type= "submit" value= "登录" name= "login" /> </form> </body> </html> |
希望本文所述对大家Java web程序设计有所帮助。