Netty提供异步的、事件驱动的网络应用程序框架和工具，用以快速开发高性能、高可靠性的网络服务器和客户端程序。也就是说，Netty 是一个基于NIO的客户，服务器端编程框架，使用Netty 可以确保你快速和简单的开发出一个网络应用，例如实现了某种协议的客户，服务端应用。Netty相当简化和流线化了网络应用的编程开发过程，例如，TCP和UDP的socket服务开发。
AsyncSocket 是基于CFSocket与CFStream封装的TCP/IP socket的网络库，它提供了异步操作,本地cocoa类的delegate支持。主要关键特新如下:
- 队列的可选超时的非阻塞的读和写。比如:你告诉它读写的内容，他将在完成的时候通知你.
- socket的自动接收。如果你告诉它接受连接，它将为每个连接建立新的实例供你调用。你也可以选择立即断开连接。
- 支持Delegate,delegate方法中包含错误、连接，接收，完整的读写、进度、以及断开连接。
- 不基于线程（thread）而基于Run-loop.虽然你可以主线程或者子线程中可以使用，但是木有必要。它使用NSRunLoop异步调用委托的方法。委托方法包括一个socket参数,允许区分多个实例。
- 自包装在一个类中。你不需要操作流或Socket。它会自己处理。
- 支持基于IPv4、IPv6的TCP流。
第一步:
下载和安装
Netty:使用maven安装Netty
AsyncSocket:使用cocoapods安装
第二步:服务端创建
1.HelloServer
package com.nettypro.io;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
public class HelloServer {
/*
* 创建服务端监听端口
*/
private static final int portNumber = 8080;
public static void main(String[] args) throws InterruptedException {
EventLoopGroup boosGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap bootstrap = new ServerBootstrap();
bootstrap.group(boosGroup, workerGroup);
bootstrap.channel(NioServerSocketChannel.class);
bootstrap.childHandler(new HelloServerInitializer())
.childOption(ChannelOption.SO_KEEPALIVE, true); // (6);
//服务器绑定端口监听
ChannelFuture channelFuture = bootstrap.bind(portNumber).sync();
//监听服务器关闭监听
channelFuture.channel().closeFuture().sync();
}finally{
boosGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}
2.HelloServerInitializer
package com.nettypro.io;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.Delimiters;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
public class HelloServerInitializer extends ChannelInitializer<SocketChannel> {
@Override
protected void initChannel(SocketChannel arg0) throws Exception {
// TODO Auto-generated method stub
//ChannelPipeline 可以理解为消息传送通道 通道一旦建立 持续存在
ChannelPipeline channelPipeline = arg0.pipeline();
//为通道添加功能
//字符串解码 编码
channelPipeline.addLast("decoder",new StringDecoder());
channelPipeline.addLast("encoder", new StringEncoder());
//添加自主逻辑
channelPipeline.addLast(new HelloServerHandler());
}
}
3.HelloServerHandler
package com.nettypro.io;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Scanner;
import javax.xml.crypto.Data;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
public class HelloServerHandler extends SimpleChannelInboundHandler<String> {
@Override
protected void channelRead0(ChannelHandlerContext arg0, String arg1)
{
// TODO Auto-generated method stub
System.out.println(arg0.channel().remoteAddress()+" ----channelRead0");
//收到消息直接打印
System.out.println(arg0.channel().remoteAddress()+" MSG: "+ arg1);
//回复消息
Scanner scanner = new Scanner(System.in);
String msgString = scanner.nextLine()+"\n";
System.out.println(arg0.channel().remoteAddress()+" msgString: "+ msgString);
arg0.writeAndFlush(msgString);
}
/**
* channel被激活时调用
*/
@Override
public void channelActive(ChannelHandlerContext ctx){
// TODO Auto-generated method stub
System.out.println(ctx.channel().remoteAddress()+" ----Acrive");
try {
ctx.writeAndFlush("Welcome you to here"+InetAddress.getLocalHost().getHostName());
} catch (UnknownHostException e) {
e.printStackTrace();
}
}
}
第三步:客户端的创建:
#import "ViewController.h"
#import <sys/socket.h>
#import <netinet/in.h>
#import <arpa/inet.h>
#import <unistd.h>
#import "AsyncSocket.h"
@interface ViewController ()<AsyncSocketDelegate>
@property (nonatomic, retain) NSTimer *heartTimer;
@property (nonatomic, retain) AsyncSocket *ay;
@property (strong, nonatomic) IBOutlet UITextField *msgTF;
@property (strong, nonatomic) IBOutlet UITextView *showTV;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.ay = [[AsyncSocket alloc] initWithDelegate:self];
[self.ay connectToHost:@"localhost" onPort:8080 error:nil];
self.ay.delegate = self;
NSString *msg = @"HelloNetty";
[self.ay writeData:[msg dataUsingEncoding:NSUTF8StringEncoding]
withTimeout:10.0f
tag:101];
[self.ay readDataWithTimeout:-1 tag:0];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)sendAction:(UIButton *)sender {
if (self.msgTF.text.length != 0) {
self.showTV.text = [NSString stringWithFormat:@"%@\n客户端说:%@",self.showTV.text,self.msgTF.text];
[self.ay writeData:[self.msgTF.text dataUsingEncoding:NSUTF8StringEncoding]
withTimeout:10.0f
tag:101];
[self.ay readDataWithTimeout:-1 tag:0];
self.msgTF.text = nil;
}
}
#pragma mark
#pragma mark --AsyncSocketDelegate--
- (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag
{
NSString *msg = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"msg-----%@",msg);
if (self.showTV.text.length == 0)
{
self.showTV.text = [NSString stringWithFormat:@"服务器说:%@",msg];
}
else
{
self.showTV.text = [NSString stringWithFormat:@"%@\n服务器说:%@",self.showTV.text,msg];
}
[self.ay readDataWithTimeout:-1 tag:0];
}
- (void)onSocket:(AsyncSocket *)sock didWriteDataWithTag:(long)tag
{
[self.ay readDataWithTimeout:-1 tag:0];
}
-(void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port
{
NSLog(@"didConnectToHost %@------%d",host,port);
[self.ay readDataWithTimeout:-1 tag:0];
}
-(void)onSocket:(AsyncSocket *)sock didReadPartialDataOfLength:(NSUInteger)partialLength tag:(long)tag
{
NSLog(@"Received bytes: %lu",(unsigned long)partialLength);
}
@end
运行结果:
wKiom1Yy5IfxBtr7AAGihZfj6Ak498.jpg
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