基于Netty5.0中级案例一之Netty与Web

2015-1-1 付政委 Netty5.0 中级篇

前言介绍：

本案例主要介绍如何在javaweb程序中加入Netty，通过web启动Netty来收发客户端连接的发来的数据。

本案例不难只不过因为不在单独使用Netty所以划分到中级篇章中。

环境需求：

1、jdk1.7

2、MyEclipse8.5【jdk配置到1.7】

3、tomcat1.7

4、Netty5.0

5、网络调试助手

代码部分：

*测试代码部分很简单，就是启动一个servlet，当网页上提交过来请求后开启Netty服务端【控制启动不要多次启动】

启动后就可以用网络调试助手测试了

NettyServletHandler.java


 package com.itstack.servlet;
 
import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
 
import javax.faces.application.Application;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import com.itstack.netty.NettyServer;
import com.itstack.service.Global;
 
public class NettyServletHandler extends HttpServlet {
 
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        this.doPost(request, response);
    }
 
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
 
        String type = request.getParameter("type");
        
        if(type.equals("open")){
            
            if(!Global.isActive){
                NettyServer server = new NettyServer();
                //线程池
                ExecutorService es = Executors.newCachedThreadPool();
                //启动线程池
                es.execute(server);
                Global.isActive = true;
                
                ServletContext application=this.getServletContext();   
                application.setAttribute("isActive", Global.isActive);
                
            }
            
        }
        
        request.getRequestDispatcher("netty/service/nettyservice.jsp").forward(request, response);
        
    }
 
}

nettyservice.jsp


 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
  </head>
 
  <body>
    <table border="1">
        <tr>
            <td>状态</td>
            <td>操作</td>
        </tr>
        <tr>
            <td>${ applicationScope.isActive?"open":"close" }</td>
            <td><a href="NettyServletHandler?type=open">开启</a></td>
        </tr>
    </table>
  </body>
</html>