Question

我有一个简单的程序，它获取用户名和密码，如果密码是 servlet ，那么它将转发到欢迎页面，否则，它将显示一条消息并包含html登录表单。当我输入用户名和密码并点击登录时，无论如何，它总是显示＆＃34; HTTP状态405：HTTP方法此URL不支持GET ＆＃34;错误。我在这里读了很多问题和答案，没有一个能帮我解决这个问题。

这是我的代码：

Simple.java

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

import javax.servlet.*;
import javax.servlet.http.*;


public class Simple extends HttpServlet {

        @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

        String p=request.getParameter("userPass");
        if(p.equals("servlet")){
            RequestDispatcher rd=request.getRequestDispatcher("welcome");
            rd.forward(request, response);

        }
        else{
            out.print("Sorry username or password error!");
            RequestDispatcher rd=request.getRequestDispatcher("index.html");
            rd.include(request, response);
        }
    }
}

WelcomeServlet.java

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

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


public class WelcomeServlet extends HttpServlet {

        @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

        String n=request.getParameter("userName");
        out.print("Welcome "+n);
    }

}

的index.html

<form action="go" method="post">
Name:<input type="text" name="userName"/><br/>
Password:<input type="password" name="userPass"/><br/>
<input type="submit" value="login"/>
</form>

的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <servlet>
    <servlet-name>Simple</servlet-name>
    <servlet-class>Simple</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>WelcomeServlet</servlet-name>
    <servlet-class>WelcomeServlet</servlet-class>
  </servlet>


  <servlet-mapping>
    <servlet-name>Simple</servlet-name>
    <url-pattern>/go</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>WelcomeServlet</servlet-name>
    <url-pattern>/welcome</url-pattern>
  </servlet-mapping>
</web-app>

Java：HTTP状态405 - 使用RequestDispatcher和doPost（）

0 个答案: