Java Web多组件协作达成用户登录验证
发布时间：2021-11-12 17:10:04 所属栏目：教程 来源：互联网
导读：实现步骤： 1、创建用户登录提交界面 2、创建处理用户登录请求servlet组件Main 3、创建代表登录成功响应的servlet的组件LoginSuccess 4、创建代表登录失败响应的servlet组件LoginFail 【1代码login.html】 !DOCTYPE html PUBLIC -//W3C//DTD HTML 4.01 Trans
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实现步骤： 1、创建用户登录提交界面 2、创建处理用户登录请求servlet组件Main 3、创建代表登录成功响应的servlet的组件LoginSuccess 4、创建代表登录失败响应的servlet组件LoginFail 【1代码login.html】 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>登录</title> </head> <body bgcolor="#FFFFFF"> <center>欢迎登录系统</center> <form name="login" action="Main" method="post"> <label>用户名：</label> <input type="text" name="userID" value=""> <label>密码：</label> <input type="password" name="password" value=""> <input type="submit" name="tj" value="提交"></input> <input type="reset" name="reset"></input> </form> </body> </html> 【2程序Main.Java】 package example.servlet; import java.io.IOException; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Servlet implementation class Main */ @WebServlet("/Main") public class Main extends HttpServlet { private static final long serialVersionUID = 1L; protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String uerID=request.getParameter("userID"); if (uerID==null) uerID=""; String password=request.getParameter("password"); if(password==null) password=""; if(uerID.equals("guest")&&password.equals("guest")){ RequestDispatcher dispatcher=request.getRequestDispatcher("LoginSuccess"); dispatcher.forward(request, response); }else { RequestDispatcher dispatcher=request.getRequestDispatcher("LoginFail"); dispatcher.forward(request, response); } } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request,response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request,response); } public String getServletinfo(){ return "short description"; } } 【3程序LoginSuccess.java】 package example.servlet; 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("/LoginSuccess") public class LoginSuccess extends HttpServlet { private static final long serialVersionUID = 1L; protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html; charset=UTF-8"); PrintWriter out=response.getWriter(); String name=request.getParameter("userID"); out.println("<html>"); out.println("<head>"); out.println("<title>登录成功</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>欢迎"+name+"您已成功登录系统</h1>"); out.println("</body>"); out.println("</html>"); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request,response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request,response); } public String getServletInfo(){ return "short description"; } } 【4程序LoginFail.java】 package example.servlet; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Servlet implementation class LoginFail */ @WebServlet("/LoginFail") public class LoginFail extends HttpServlet { private static final long serialVersionUID = 1L; protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html; charset=UTF-8"); PrintWriter out=response.getWriter(); out.print("<html>"); out.print("<head>"); out.print("<title>登录失败</title>"); out.print("</head>"); out.print("<body>"); out.print("<h1>登录失败，请重新登录</h1>"); RequestDispatcher dispatcher=request.getRequestDispatcher("login.html"); dispatcher.include(request, response); out.print("</body>"); out.print("<html>"); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request,response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request,response); } public String getServletInfo(){ return "short description"; } }  （编辑：三明站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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