package com.tz.servlet;import java.io.IOException;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("Login")public class Login extends HttpServlet { /** * */ private static final long serialVersionUID = 1L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req,resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String username=req.getParameter("username"); String password=req.getParameter("password"); if(username!=null&&password!=null&&username.equals("aaa")&&password.equals("1234")){ req.setAttribute("username", username); req.getRequestDispatcher("/welcome").forward(req,resp); }else{ req.getRequestDispatcher("/error").forward(req,resp); } }}package com.tz.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("/welcome")public class Welcome extends HttpServlet { /** * */ private static final long serialVersionUID = 1L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // TODO Auto-generated method stub super.doGet(req, resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String username=req.getParameter("username"); PrintWriter out = resp.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>登录信息</title>"); out.println("</head>"); out.println("<body algin=center>"); out.println("<h2>"+"歡迎您"+username+"</h2>"); out.println("</body>"); out.println("</html>"); }}/** * */package com.tz.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;/** * @author Administrator * */@WebServlet("/error")public class Error extends HttpServlet { /** * */ private static final long serialVersionUID = 1L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req,resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { PrintWriter out =resp.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>登录信息</title>"); out.println("</head>"); out.println("<body algin=center>"); out.println("<h2>登陆错误请重新登陆</h2>"); out.println("</body>"); out.println("</html>"); }}<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Insert title here</title><style type="text/css"> #box{width:500px;height:500px;margin:100px auto;} #sub{text-align:center} #box form div{width:230px;height:40px;line-heihgt:340px}</style></head><body> <div id="box"> <h3>聊天室</h3> <form action="/land/Login" method="post"> <div class="text">账号<input type="text" name="username" /></div> <div class="pas">密码<input type="password" name="password" /></div> <div class="sub"><input type="submit" value="登陆" class="sub"></div> </form> </div></body></html>
1 回答
产品经理不是经理
TA贡献481条经验 获得超143个赞
第一个Servlet注解改为：@WebServlet("/Login");
表单form里的 action="/land/Login"改为action="${pageContext.request.contextPath}/Login"
使用@WebServlet注解的话，就不用在web.xml里面配置Servlet与UrlPattern了。
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