簡單Servlet HTTP狀態405 - 此方法不支持HTTP方法GET

Question

我開始學習servlet。 代碼的Servlet：

package arver; 

import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import java.io.IOException; 
import java.io.PrintWriter; 

/** 
* Created by 35717 on 30.03.2016. 
*/ 
public class MainServlet extends HttpServlet { 
    @Override 
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 
     super.doGet(req, resp); 
     PrintWriter out = resp.getWriter(); 
     out.print("servlet"); 
    } 

    @Override 
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 
     super.doPost(req, resp); 
    } 
} 

文件的web.xml

<?xml version="1.0" encoding="UTF-8"?> 
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
      xmlns="http://java.sun.com/xml/ns/javaee" 
      xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 
      version="3.0"> 

     <servlet> 
      <servlet-name>MainServlet</servlet-name> 
      <servlet-class>arver.MainServlet</servlet-class> 
     </servlet> 

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

    </web-app> 

服務器響應： HTTP狀態405 - HTTP GET方法不受此URL支持

類型狀態報告

消息HTTP方法GET不受此URL支持

description所請求的資源不允許指定的HTTP方法。

的Apache Tomcat/9.0.0.M4

爲什麼我會收到HTTP狀態405 - HTTP GET方法不是由這個程序該URL錯誤支持。

Answer 1

我們擴展了HttpServlet和@Override doPost，但是在我們的實現中，我們不會調用它的super，因爲調用super會給出這個消息。

當你做super.doGet（request，response）;在你的Servlet的doGet（）方法中，你實際上調用了HttpServlet類的doget（）。所以放下超級通話。這不是必需的。

就刪除這些行：

super.doGet(req, resp); 
super.doPost(req, resp); 

Answer 2

使用GET或POST方法

MainServlet.java

package arver; 

import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import java.io.IOException; 
import java.io.PrintWriter; 

/** 
* Created by 35717 on 30.03.2016. 
*/ 
public class MainServlet extends HttpServlet { 
    @Override 
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException 
{   
     PrintWriter out = resp.getWriter(); 
     out.print("servlet"); 
    } 
} 

web.xml文件

<?xml version="1.0" encoding="UTF-8"?> 
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
      xmlns="http://java.sun.com/xml/ns/javaee" 
      xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 
      version="3.0"> 
<welcome-file-list> 
    <welcome-file>index.html</welcome-file> 
</welcome-file-list> 

     <servlet> 
      <servlet-name>MainServlet</servlet-name> 
      <servlet-class>arver.MainServlet</servlet-class> 
     </servlet> 

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

    </web-app> 

地址必須是這樣的：http://localhost:8080/Project名/嘛inServlet