JSP学习笔记（3）——域对象的属性操作

//转发：地址栏为/forwardServlet
import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class ForwardServlet
 */
@WebServlet("/forwardServlet")
public class ForwardServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	
		//请求的转发
		//1.调用HttpServletRequest的getRequestDispatcher()方法获取RequestDispatcher对象
		//调用getRequestDispatcher()需要传入要转发的地址
		String path = "testServlet";
		RequestDispatcher requestDispatcher = request.getRequestDispatcher("/" + path);
		//2.调用HttpServletRequest的forward(request,response)进行请求的转发
		requestDispatcher.forward(request, response);
		
	}

}


//重定向：地址栏为testServlet
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class RedirectServlet
 */
@WebServlet("/redirectServlet")
public class RedirectServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
      

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
		//执行请求的重定向，直接调用response.sendRedirect(path)方法，path为重定向的地址
		String path = "testServlet";
		response.sendRedirect(path);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}