nio - netty

程序员文章站 2022-04-24 10:52:29

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HttpClient.java

package nio_netty.demo01;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
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.NioSocketChannel;
import io.netty.handler.codec.http.DefaultFullHttpRequest;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpRequestEncoder;
import io.netty.handler.codec.http.HttpResponseDecoder;
import io.netty.handler.codec.http.HttpVersion;

import java.net.URI;

public class HttpClient
{
	public void connect(String host, int port) throws Exception
	{
		EventLoopGroup workerGroup = new NioEventLoopGroup();

		try
		{
			Bootstrap b = new Bootstrap();
			b.group(workerGroup);
			b.channel(NioSocketChannel.class);
			b.option(ChannelOption.SO_KEEPALIVE, true);
			b.handler(new ChannelInitializer<SocketChannel>()
			{
				@Override
				public void initChannel(SocketChannel ch) throws Exception
				{
					// 客户端接收到的是httpResponse响应，所以要使用HttpResponseDecoder进行解码
					ch.pipeline().addLast(new HttpResponseDecoder());
					// 客户端发送的是httprequest，所以要使用HttpRequestEncoder进行编码
					ch.pipeline().addLast(new HttpRequestEncoder());
					ch.pipeline().addLast(new HttpClientInboundHandler());
				}
			});

			// Start the client.
			ChannelFuture f = b.connect(host, port).sync();

			URI uri = new URI("http://127.0.0.1:8844");
			String msg = "Are you ok?";
			DefaultFullHttpRequest request = new DefaultFullHttpRequest(
					HttpVersion.HTTP_1_1, HttpMethod.GET, uri.toASCIIString(),
					Unpooled.wrappedBuffer(msg.getBytes("UTF-8")));

			// 构建http请求
			request.headers().set(HttpHeaders.Names.HOST, host);
			request.headers().set(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.KEEP_ALIVE);
			request.headers().set(HttpHeaders.Names.CONTENT_LENGTH, request.content().readableBytes());
			// 发送http请求
			f.channel().write(request);
			f.channel().flush();
			f.channel().closeFuture().sync();
		} finally
		{
			workerGroup.shutdownGracefully();
		}

	}

	public static void main(String[] args) throws Exception
	{
		HttpClient client = new HttpClient();
		client.connect("127.0.0.1", 8844);
	}
}

HttpClientInboundHandler.java

package nio_netty.demo01;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.util.CharsetUtil;

public class HttpClientInboundHandler extends ChannelInboundHandlerAdapter 
{
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception 
    {
        if (msg instanceof HttpResponse) 
        {
            HttpResponse response = (HttpResponse) msg;
            System.out.println("CONTENT_TYPE:" + response.headers().get(HttpHeaders.Names.CONTENT_TYPE));
        }
        
        if(msg instanceof HttpContent)
        {
            HttpContent content = (HttpContent)msg;
            ByteBuf buf = content.content();
            System.out.println(buf.toString(CharsetUtil.UTF_8));
            buf.release();
        }
    }
}

HttpServer.java

package nio_netty.demo01;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

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;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;

/**
 * http://www.cnblogs.com/luxiaoxun/p/3959450.html
 * 
 * @author admin
 */
public class HttpServer
{
	private static Log log = LogFactory.getLog(HttpServer.class);

	public void start(int port) throws Exception
	{
		EventLoopGroup bossGroup = new NioEventLoopGroup();
		EventLoopGroup workerGroup = new NioEventLoopGroup();

		try
		{
			ServerBootstrap b = new ServerBootstrap();

			b.group(bossGroup, workerGroup)
					.channel(NioServerSocketChannel.class)
					.childHandler(new ChannelInitializer<SocketChannel>()
					{
						@Override
						public void initChannel(SocketChannel ch) throws Exception
						{
							// server端发送的是httpResponse，所以要使用HttpResponseEncoder进行编码
							ch.pipeline().addLast(new HttpResponseEncoder());

							// server端接收到的是httpRequest，所以要使用HttpRequestDecoder进行解码
							ch.pipeline().addLast(new HttpRequestDecoder());

							//
							ch.pipeline().addLast(new HttpServerInboundHandler());
						}
					}).option(ChannelOption.SO_BACKLOG, 128)
					.childOption(ChannelOption.SO_KEEPALIVE, true);

			ChannelFuture f = b.bind(port).sync();
			f.channel().closeFuture().sync();
		}
		finally
		{
			workerGroup.shutdownGracefully();
			bossGroup.shutdownGracefully();
		}
	}

	public static void main(String[] args) throws Exception
	{
		HttpServer server = new HttpServer();
		log.info("Http Server listening on 8844 ...");
		server.start(8844);
	}
}

HttpServerChannelInitializer.java

package nio_netty.demo01;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;

public class HttpServerChannelInitializer extends ChannelInitializer<SocketChannel>
{
	protected void initChannel(SocketChannel ch) throws Exception
	{
		// server端发送的是httpResponse，所以要使用HttpResponseEncoder进行编码
        ch.pipeline().addLast(new HttpResponseEncoder());
        
        // server端接收到的是httpRequest，所以要使用HttpRequestDecoder进行解码
        ch.pipeline().addLast(new HttpRequestDecoder());
        
        //
        ch.pipeline().addLast(new HttpServerInboundHandler());
	}
}

HttpServerInboundHandler.java

package nio_netty.demo01;

import static io.netty.handler.codec.http.HttpResponseStatus.OK;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.util.CharsetUtil;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class HttpServerInboundHandler extends ChannelInboundHandlerAdapter 
{

    private static Log log = LogFactory.getLog(HttpServerInboundHandler.class);

    private HttpRequest request;

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception 
    {
        if (msg instanceof HttpRequest) 
        {
            request = (HttpRequest) msg;
            String uri = request.getUri();
            System.out.println("Uri:" + uri);
        }
        
        if (msg instanceof HttpContent) 
        {
            HttpContent content = (HttpContent) msg;
            ByteBuf buf = content.content();
            //public static final Charset UTF_8 = Charset.forName("UTF-8");
            System.out.println(buf.toString(CharsetUtil.UTF_8));
            buf.release();

            String res = "I am OK";
            FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK, Unpooled.wrappedBuffer(res.getBytes("UTF-8")));
            response.headers().set("Content-Type", "text/plain");
            response.headers().set("Content-Length", response.content().readableBytes());
            if (HttpHeaders.isKeepAlive(request)) 
            {
                response.headers().set("Connection", "keep-alive");
            }
            ctx.write(response);
            ctx.flush();
        }
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception 
    {
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) 
    {
        log.error(cause.getMessage());
        ctx.close();
    }

}

log4j.properties

# Root logger option
log4j.rootLogger=INFO, stdout, file

# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

log4j.appender.file = org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.File = logs/log.log
log4j.appender.file.Append = true
log4j.appender.file.Threshold = INFO
log4j.appender.file.layout = org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} %5p %c{1}:%L - %m%n

例如即时聊天可以用到，网上有个人有这样的代码。
swing写的，下次找到分享。

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