getting error HTTP Status 405 - HTTP method GET is not supported by this URL but not used `get` ever?

StackOverflow https://stackoverflow.com/questions/23624442

题

I'm a beginner and making a small registration program with database But i'm trying to run this but it's giving me some errors pls help:

HTTP Status 405 - HTTP method GET is not supported by this URL

type Status report

message HTTP method GET is not supported by this URL

description The specified HTTP method is not allowed for the requested resource.
Apache Tomcat/8.0.5

And here is my register.html codes:

<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<form action="Register" method="post">
    Name: <input type="text" name="name">
    Email: <input type="text" name="email">
    Password: <input type="password" name="password">
    Country:

    <select name="userCountry">
        <option>India</option>
        <option>Pakistan</option>
        <option>Other</option>
    </select><br><br>

    <input type="submit" value="register">
</form>
</body>
</html>

Here is my Register.java codes:

import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class Register extends HttpServlet{
    public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException{
        response.setContentType("text/html");
        PrintWriter out=response.getWriter();

        String n=request.getParameter("name");
        String p=request.getParameter("password");
        String e=request.getParameter("email");
        String c=request.getParameter("userCountry");

        try{
            Connection con=DriverManager.getConnection(
                    "jdbc:mysql://localhost:8888", "root", "1234"
            );

            PreparedStatement ps=con.prepareStatement("insert into REGISTERUSER values(?, ?, ?, ?)");

            ps.setString(1,n);
            ps.setString(2,p);
            ps.setString(3,e);
            ps.setString(4,c);

            int i=ps.executeUpdate();
            if(i>0){
                out.print("Registered successfully..");
            }

        }catch(Exception d){d.printStackTrace();}
        out.close();
    }
}

And here is my Web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

    <servlet>
        <servlet-name>Register</servlet-name>
        <servlet-class>Register</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Register</servlet-name>
        <url-pattern>/register.html</url-pattern>
    </servlet-mapping>
    <welcome-file-list>
        <welcome-file>register.html</welcome-file>
    </welcome-file-list>
</web-app>

Help would be appreciated!!

有帮助吗？

解决方案

The problem is that you mapped your servlet to /register.html and it expects POST method, because you implemented only doPost() method. So when you open register.html page, it will not open html page with the form but servlet that handles the form data.

Alternatively when you submit POST form to non-existing URL, web container will display 405 error (method not allowed) instead of 404 (not found).

To fix:

<servlet-mapping>
    <servlet-name>Register</servlet-name>
    <url-pattern>/Register</url-pattern>
</servlet-mapping>

其他提示

Override service method like this: 

protected void service(HttpServletRequest request, HttpServletResponse   response) throws ServletException, IOException {
        doPost(request, response);
}

And Voila!

I think your issue may be in the url pattern. Changing

<servlet-mapping>
    <servlet-name>Register</servlet-name>
    <url-pattern>/Register</url-pattern>
</servlet-mapping>

and

<form action="/Register" method="post">

may fix your problem

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