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我是jsp和google app引擎的新手,但出現此錯誤:此URL不支持HTTP方法GET。

[英]I am new to jsp and google app engine getting this error: HTTP method GET is not supported by this URL

這是我的JSP文件。 它具有3個文本字段和一個提交按鈕。

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

"http://www.w3.org/TR/html4/loose.dtd">
<html>
  <head>
  <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Insert title here</title>
  </head>
<body>
   <form action="buttontoserv" method="post">
    <input type="text" name="name"/><br>        
    <input type="text" name="group"/>
    <input type="text" name="pass"/>
    <input type="submit" value="submit">            
  </form>
</body>
</html> 

這是我的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"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<servlet>
    <servlet-name>ButtontoServ</servlet-name>
    <servlet-class>pack.exp.ButtontoServServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>ButtontoServ</servlet-name>
    <url-pattern>/buttontoserv</url-pattern>
</servlet-mapping>
<welcome-file-list>
    <welcome-file>index.html</welcome-file>
</welcome-file-list>
</web-app>

這是pack.exp包下的servlet,文件名為ButtontoServServlet.java

package pack.exp;
import java.io.IOException;

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

@SuppressWarnings("serial")
public class ButtontoServServlet extends HttpServlet 
{
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException 
    {
    String name = request.getParameter("name");
    String group = request.getParameter("group");
    String pass = request.getParameter("pass");
    System.out.println("Name :"+ name);
    System.out.println("group :"+ group);
    System.out.println("pass :"+ pass);
    }
}

當我將其部署到Google App Engine時,它會引發此錯誤“錯誤:此URL不支持HTTP方法GET”

我也嘗試了tomcat,錯誤消息為“不允許使用HTTPO 405方法。該網站無法顯示頁面HTTP 405最有可能的原因:•該網站存在編程錯誤。”

由於您的servlet只有doPost方法。 因此,您無法使用URL訪問servlet。 您的URL應該用於分配了action="buttontoserv" JSP頁面。 當您單擊JSP頁面的/buttontoserv按鈕時,它將被轉發到/buttontoserv servlet。

為了解決您的問題,您應該在Servlet上包含一個doGet方法,或者使用從JSP頁面提交的表單將其轉發到Servlet。

public class ButtontoServServlet extends HttpServlet {

    protected void processRequest(HttpServletRequest request,
        HttpServletResponse response)
            throws ServletException, IOException {
    String name = request.getParameter("name");
    String group = request.getParameter("group");
    String pass = request.getParameter("pass");
    System.out.println("Name :"+ name);
    System.out.println("group :"+ group);
    System.out.println("pass :"+ pass);

    }    
    @Override
    protected void doGet(HttpServletRequest request,
             HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

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

確保您將URL鍵入到jsp文件而不是servlet。 也可以嘗試覆蓋doGet方法,例如:

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

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