javaee 请求转发 servlet 到 servlet

package s;

import java.io.IOException;

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

public class a1 extends HttpServlet{
	
	@Override
	public void doPost(HttpServletRequest req, HttpServletResponse res){
		try {
			this.getServletContext().getRequestDispatcher("/second").forward(req, res);
                //或者写成以下形式
			//req.getRequestDispatcher("/second").forward(req, res);
			//servlet 到 servlet 请求转发的写法
                //    "/second" 是xml中写的对应servlet的映射
		} catch (ServletException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	@Override
	public void doGet(HttpServletRequest req, HttpServletResponse res){
		doPost(req, res);
	}
}