Question

我正在尝试创建一个登录servlet。我有一个login.jsp，我使用表单获取数据，LoginServlet使用HttpSession，最后是我的web.xml 我在stackoverflow搜索了这里，我纠正了一些我发现的错误。即使找不到我的LoginServlet：

HTTP状态404 - /test_pages/main_pages/com.register/LoginServlet

type: Status report

message: /test_pages/main_pages/com.register/LoginServlet

description: The requested resource is not available.

我在状态404中看到我的servlet的路径是：/test_pages/main_pages/com.register/LoginServlet

这是错误的道路。我的servlet不在main_pages中。我在写作。我必须创建一个项目才能在apache tomcat中运行所有的东西，这让我很困惑。我的LoginServlet位于Java Resources / src / com.register中。 “com.register”是我的包裹。

你能告诉我一个正确的方式在我的表格中写下这个动作吗？你认为问题出在其他地方吗？请帮我！提前谢谢！

这是我的代码：

的login.jsp

 .
 .
 .
 <form action="com.register/LoginServlet" method="post">
 <p>
 <label id="upodeiksh">username</label>
 <br />
 <input type="text" name="username" id="koutaki" required/>
 </p>
 <br />
 <p>
 <label id="upodeiksh">password</label>
 <br />
 <input type="password" name="password" id="koutaki" required/>
 </p>
 <br />
 <input type="submit" name="upload" value="login" id="submit_button"/>
 </form>

LoginServlet.java

package com.register;

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

import java.sql.*;

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

public class LoginServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

         response.setContentType("text/jsp");  
         PrintWriter out=response.getWriter();
         request.getRequestDispatcher("test.jsp").include(request, response);

         String name=request.getParameter("username");  
         String password=request.getParameter("password");
         String psw = null;

         Connection con = null;
         PreparedStatement pr = null;
         ResultSet rs = null;

         try
         {
             Class.forName("com.mysql.jdbc.Driver");
             con = DriverManager.getConnection("jdbc:mysql://localhost:3306/ted","root","1234");

             pr = con.prepareStatement("select * from ted.users where usrname=?;");

             pr.setString(1, name);

             rs = pr.executeQuery();

             //An den brethei to onoma
             if(rs == null)
             {
                out.print("Το όνομα χρήστη : "+name+" δεν υπάρχει");
                request.getRequestDispatcher("main_pages/login.jsp").include(request, response);
             }

             else
             {
                 //An brethei to onoma
                 while(rs.next())
                 {
                     psw = rs.getString("psw");
                 }

                 if(psw != password)
                 {
                     out.print("Λάθος κωδικός πρόσβασης");
                    request.getRequestDispatcher("main_pages/login.jsp").include(request, response);
                 }

                 else if(psw == password)
                 {
                    out.print("Γεια");
                    HttpSession session=request.getSession();  
                    session.setAttribute("name",name);  
                 }
             }

         }

         catch (Exception e)
         {
             System.out.println("The error is=="+e.getMessage()); 
         }

         finally
         {
             try
             {
                 con.close();
             } 

             catch (SQLException e)
             {
                 e.printStackTrace();
             }
         }
    }
}

的web.xml

    .
    .
      <servlet>  
        <description></description>  
        <display-name>LoginServlet</display-name>  
        <servlet-name>LoginServlet</servlet-name>  
        <servlet-class>com.register.LoginServlet</servlet-class>  
      </servlet>  
      <servlet-mapping>  
        <servlet-name>LoginServlet</servlet-name>  
        <url-pattern>/LoginServlet</url-pattern>  
      </servlet-mapping>  
      <servlet> 
    .
    .

Answer 1

您的servlet映射是错误的。像这样更改您的表单操作 <form action="LoginServlet" method="post">

Jsp连接到servlet HTTP状态404

1 个答案: