Netty入门
Netty的重要性不言而喻。那么今天就来学习一下Netty。
整个项目基于Gradle搭建。
Build如下所示:
plugins {
id 'java'
}
group 'cn.baldorange'
version '1.0'
sourceCompatibility = 1.8
targetCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile group: 'io.netty', name: 'netty-all', version: '4.1.41.Final'
}
主要得去mvn仓库里把netty-all拉下来。
一个HTTP的服务器。
import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.*;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;
public class TestServer {
public static void main(String[] args) throws Exception{
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap serverBootstrap = new ServerBootstrap();
serverBootstrap.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.childHandler(new ChannelInitializer<SocketChannel>(){
@Override
protected void initChannel(SocketChannel ch){
ChannelPipeline pipeline = ch.pipeline();
pipeline.addLast("httpServerCodec",new HttpServerCodec());
pipeline.addLast("httpServerHandler",new SimpleChannelInboundHandler<HttpObject>(){
@Override
protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception{
if(msg instanceof HttpRequest) {
HttpRequest httpRequest = (HttpRequest) msg;
ByteBuf content = Unpooled.copiedBuffer("Hello World", CharsetUtil.UTF_8);
FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);
response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
response.headers().set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());
ctx.writeAndFlush(response);
}
}
});
}
});
ChannelFuture channelFuture = serverBootstrap.bind(8888).sync();
channelFuture.channel().closeFuture().sync();
}finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}
运行结果如下所示:
好的我们现在已经完成了一个Http最简单的服务器。
如果跑起来了,我们开始下一步的学习。
这里面我们可以看到在这俩个地方,我们实现了俩个抽象类
我们一一去讲解。
SimpleChannelInboundHandler
我们新创建一个类,叫HttpServerHandler
代码如下:
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;
public class HttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {
@Override
protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
if(msg instanceof HttpRequest) {
HttpRequest httpRequest = (HttpRequest) msg;
ByteBuf content = Unpooled.copiedBuffer("Hello World", CharsetUtil.UTF_8);
FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);
response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
response.headers().set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());
ctx.writeAndFlush(response);
}
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
System.out.println("channel active");
super.channelActive(ctx);
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
System.out.println("channel registered");
super.channelRegistered(ctx);
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
System.out.println("handle added");
super.handlerAdded(ctx);
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
System.out.println("channel inactive");
super.channelInactive(ctx);
}
@Override
public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
System.out.println("channel unregistered");
super.channelUnregistered(ctx);
}
}
原文地址:https://www.cnblogs.com/godoforange/p/11593295.html
时间: 2024-11-08 06:45:55