Servlet控制器作用

package com.demo.servlet;

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 AServlet extends HttpServlet {

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

request.setAttribute("theRequestValue", 2014);

request.getRequestDispatcher("/B?param=2013").forward(request, response);

// response.sendRedirect("/Controller/B?param=2013");

// response.sendRedirect("B?param=2013");
}
}

package com.demo.servlet;

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 BServlet extends HttpServlet {

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

PrintWriter out=response.getWriter();

String param=request.getParameter("param");

Integer theRequestValue=(Integer) request.getAttribute("theRequestValue");

out.print("param:"+param);

out.print("<br/>");

out.print("theRequestValue:"+theRequestValue);

out.flush();

out.close();
}
}
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