HTTP method GET is not supported by this URL 问题解决

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复制代码
复制代码package mypack;

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 HelloServlet extends HttpServlet{

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		super.doGet(req, resp);
		String username=req.getParameter("username");
		if(username!=null){
			username=new String(username.getBytes("ISO-8859-1"),"GB2312");
			
			
		}
		if(username==null){
			resp.sendError(resp.SC_FORBIDDEN);
			return;
		}
		resp.setContentType("text/html;charset=GB2312");
		PrintWriter out=resp.getWriter();
		out.println("<html><head><title>,</title></head>");
		out.println("<body>");
		out.println("hello:"+username);
		out.println("</body></html>");
		System.out.println("before:"+resp.isCommitted());
		out.close();
		System.out.println("after:"+resp.isCommitted());
	}
	

}
package mypack;

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 HelloServlet extends HttpServlet{

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		super.doGet(req, resp);
		String username=req.getParameter("username");
		if(username!=null){
			username=new String(username.getBytes("ISO-8859-1"),"GB2312");
			
			
		}
		if(username==null){
			resp.sendError(resp.SC_FORBIDDEN);
			return;
		}
		resp.setContentType("text/html;charset=GB2312");
		PrintWriter out=resp.getWriter();
		out.println("<html><head><title>,</title></head>");
		out.println("<body>");
		out.println("hello:"+username);
		out.println("</body></html>");
		System.out.println("before:"+resp.isCommitted());
		out.close();
		System.out.println("after:"+resp.isCommitted());
	}
	

}

此时我们访问：http://localhost:8080/../hello?name=test
就会出现：
      HTTP Status 405 - HTTP method GET is not supported by this URL
出现错误的原因：
1，继承HttpServlet的Servlet没有覆写对应请求和响应的处理方法即：doGet或
      doPost等方法；默认调用了父类的doGet或doPost等方法；
2，父类HttpServlet的doGet()或doPost()方法覆盖了你重写的doGet或doPost等
      方法；
      只要出现以上的情况之一，父类HttpServlet的doGet或doPost等方法的默认实现是
      返回状态代码为405的HTTP错误表示：对于指定资源的请求方法不被允许。
解决方法：
1，子类覆写父类的doGet或doPost等方法；
2，在你的Servlert中覆写doGet或doPost等方法来处理请求和响应，不要调用父类
     HttpServlet的doGet() 和 doPost()方法，即：
     将doGet()方法中的 super.doGet(req, resp);
             改为：this.doPost(req , resp) ; 可以解决问题