405: HTTP method GET is not supported by this URL

 

先看错误代码：

 

public class WXSenderServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		super.doGet(req, resp);
		resp.getWriter().print("WXSenderServlet----doGet()");
	}

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

}

 继承了HttpServlet而且实现了两个方法，并且：

<!-- Servlets -->
    <servlet>
        <servlet-name>WXSenderServlet</servlet-name>
        <servlet-class>pa.wechat.plugin.servlet.WXSenderServlet</servlet-class>
    </servlet>

    <!-- Servlet mappings  url-pattern必须小写-->
    <servlet-mapping>
        <servlet-name>WXSenderServlet</servlet-name>
        <url-pattern>/wechatsender</url-pattern>
    </servlet-mapping>

 那为什么还会有错误呢？

 

 

哈哈哈，原来是因为super.doGet(req, resp);里面不是空的。

 

看一位网友的回答的不错，照抄了过来：

 

The HttpServlet basically follows the template method pattern where all non-overridden HTTP methods returns a HTTP 405 error "Method not supported". When you override such a method, you should not call super method, because you would otherwise still get the HTTP 405 error. The same story goes on for your doPost() method.

This also applies on service() by the way, but that does technically not harm in this construct since you need it to let the default implementation execute the proper methods. Actually, the whole service() method is unnecessary for you, you can just remove the entire method from your servlet.

The super.init(); is also unnecessary. It's is only necessary when you override the init(ServletConfig), because otherwise the ServletConfig wouldn't be set. This is alsoexplicitly mentioned in the javadoc. It's the only method which requires a super call.

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Unrelated to the concrete problem, spawning a thread in a servlet like that is a bad idea. For more detail, start reading this answer.

 

 

 

恩，就是这样的。