Servlet forward & include

之前写过一篇求某范围质数J2EE及JS版本的

http://blog.youkuaiyun.com/hhooong/article/details/50375887

在这边顺便扯一扯Servlet的forward和include关系，在原代码的基础上，多点东西：

package edu.fjnu.Harry;

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 waiterServlet extends HttpServlet {

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

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=utf-8");
		String menu = request.getParameter("menu");
		if("火腿肠".equals(menu)|| "泡面".equals(menu) ){
			System.out.println("先生您好，您所点的菜单为："+menu+"，我就这去帮你取"+menu);
			request.setAttribute("order", menu);
			request.getRequestDispatcher("/smallCooker").include(request, response);
			PrintWriter out = response.getWriter();
			String smallmenu = (String) request.getAttribute("smallmenu");
			out.print("include协作已经完成"+smallmenu+" 请慢用");
		}
		else{
		System.out.println("先生您好，您所点的菜单为："+menu+"，我这就送给厨师");
		request.setAttribute("order", menu);
//		request.removeAttribute("order");
		request.getRequestDispatcher("/cooker").forward(request, response);
		
		}
	}

}

package edu.fjnu.Harry;

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 SmallCooker extends HttpServlet {

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

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=utf-8");
		String menu = (String) request.getAttribute("order");
		System.out.println("小厨师收到了做"+menu+"的命令，现在已经做好了。请waiter帮忙送"+menu+"" +
				"到顾客手中");
		request.setAttribute("smallmenu", menu);
		
	
	}
	

}

include其实有点类似于，之前学C++的时候，A函数里面调用B函数

B（）{

}

A（）{

*****

B（）

}

之前跟这次的代码结合，如果顾客点的餐是泡面或是火腿肠，那么会跳到smallcooker（B函数），B函数直接返回，由waiterServlet直接送到顾客手上

走一遍代码就懂了~，include不常用，在平时开发中用的更多是forward