Java HTTP 状态 405 - 此 URL 不支持 HTTP 方法 POST

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

提问by Ankur

I am getting the error HTTP Status 405 - HTTP method POST is not supported by this URLwhen I use the following code(below) ... the line causing the trouble (apparently) is getServletContext().getRequestDispatcher("/EditObject?id="+objId).forward(request, response);

HTTP Status 405 - HTTP method POST is not supported by this URL当我使用以下代码（如下）时出现错误......导致问题的行（显然）是getServletContext().getRequestDispatcher("/EditObject?id="+objId).forward(request, response);

package web.objects;

import java.io.IOException;
import java.sql.SQLException;

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

import dao.ObjDetailsDao;

@SuppressWarnings("serial")
public class EditObjectText extends HttpServlet {

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


  int objId = Integer.parseInt(request.getParameter("objId"));
  String text = (String)request.getParameter("description");

  ObjDetailsDao oddao = new ObjDetailsDao();
   try {
oddao.modifyText(text, objId);
 /////////////
    getServletContext().getRequestDispatcher("/EditObject?id="+objId).forward(request, response);
 ////////////
   } catch (SQLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   } catch (ServletException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
        }
      }
}

EDIT: I added the throws ServletException, IOExceptionas suggested, but this did not change the error.

编辑：我throws ServletException, IOException按照建议添加了，但这并没有改变错误。

EDIT: the EditObject servlet looks like this

编辑：EditObject servlet 看起来像这样

 @SuppressWarnings("serial")
public class EditObject extends HttpServlet{

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {

        int objId = Integer.parseInt(request.getParameter("id"));
        dispPage(objId, request, response);
    }

    private void dispPage(int objId, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{        

// ... lots of code in here
            getServletContext().getRequestDispatcher("/jsp/objectPageEdit.jsp").forward(request, response);

    }
}

ANOTHER EDIT: So basically I can't do what I am doing. What I need is this, the user submits a post request and then I refer him/her back to a servlet which uses the Get method instead of Post. How can I do this referral without getting the error? Thanks in advance.

另一个编辑：所以基本上我不能做我正在做的事情。我需要的是，用户提交一个发布请求，然后我将他/她推荐回使用 Get 方法而不是 Post 的 servlet。如何在不出错的情况下进行此推荐？提前致谢。

采纳答案by BalusC

_{(sorry about the wrong answer I posted before, I deleted it).}

_{（抱歉之前贴错了答案，我删除了）。}

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Apparently the URL /EditObjectis mapped on another servlet which doesn't have doPost()method overriden. It would be called on RequestDispatcher#forward()as well because the method of currently running HTTP request is POST. The defaultHttpServlet#doPost()implementation will return HTTP 405. If your actual intent is to fire a GET request on it so that the doGet()method will be invoked, then you should rather use HttpServletResponse#sendRedirect()instead.

显然，该 URL/EditObject映射到另一个没有doPost()覆盖方法的servlet 。它也会被调用，RequestDispatcher#forward()因为当前运行 HTTP 请求的方法是 POST。该默认HttpServlet#doPost()实现将返回HTTP 405如果您的实际意图是火中的GET请求，这样的doGet()方法将被调用，那么你应该宁愿使用HttpServletResponse#sendRedirect()来代替。

response.sendRedirect("/EditObject?id="+objId);

回答by gawi

Add a doPost() to your EditObject class:

将 doPost() 添加到您的 EditObject 类：

 @SuppressWarnings("serial")
public class EditObject extends HttpServlet{

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
      process(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
      process(request, response);
    }


    public void process(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {    
        int objId = Integer.parseInt(request.getParameter("id"));
        dispPage(objId, request, response);
    }

    private void dispPage(int objId, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{        

// ... lots of code in here
            getServletContext().getRequestDispatcher("/jsp/objectPageEdit.jsp").forward(request, response);

    }
}