http://www.cnblogs.com/luxiaoxun/p/3959450.html

基于Netty4的HttpServer和HttpClient的简单实现

Netty的主页:http://netty.io/index.html

使用的Netty的版本:netty-4.0.23.Final.tar.bz2 ‐ 15-Aug-2014 (Stable, Recommended)

Http 消息格式:

Http request:

Method path-to-resource HTTPVersion-number

Header-name-1: value1

Header-name-2: value2

Optional request body

Http response:

HTTP/Version-number response-code response-phrase

Header-name-1: value1

Header-name-2: value2

Optional response body

实现一个简单的Http请求及响应过程:

1、Client向Server发送http请求。

2、Server端对http请求进行解析。

3、Server端向client发送http响应。

4、Client对http响应进行解析。

Netty中Http request消息格式:

Netty中Http response消息格式:

代码实例:

Http Server:

package com.netty.test;

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;

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() {

@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);

}

}

响应请求的HttpServerInboundHandler:

package com.netty.test;

import static io.netty.handler.codec.http.HttpHeaders.Names.CONNECTION;

import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_LENGTH;

import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE;

import static io.netty.handler.codec.http.HttpResponseStatus.OK;

import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

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.HttpHeaders.Values;

import io.netty.handler.codec.http.HttpRequest;

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();

System.out.println(buf.toString(io.netty.util.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, Values.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();

}

}

Http Client:

按 Ctrl+C 复制代码

按 Ctrl+C 复制代码

处理Server响应的HttpClientInboundHandler:

按 Ctrl+C 复制代码

按 Ctrl+C 复制代码

log4j的配置:

# 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