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實例：Netty 基於Http協議下的數據傳輸Demo
Http/Https協議是最重要最常用到的協議之一，Netty提供了一些了的Handler來處理Http協議下的編碼工作。下麵就介紹一個Netty實例：
1.通過HttpClient發送Protobuf類型數據到服務端
2.服務端Netty負責把接收到的Http請求中的數據再發送到客戶端。
3.其中Netty對發送的數據量沒有限製，因為Http發送的message往往是由一係列infragment構成，Netty可以把接收到的http請求片段信息整合（Aggregator）到一起，最終得到一個FullHttpRequest。
Client端：
package NettyDemo.echo.client;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import NettyDemo.echo.protocal.AddressBookProtos;
import NettyDemo.echo.server.HttpProtobufServer;
public class HttpClientDemo {
public static void main(String[] args) throws ClientProtocolException,
IOException {
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpHost proxy = new HttpHost(HttpProtobufServer.IP,
HttpProtobufServer.PORT);
httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY,
proxy);
HttpPost httppost = new HttpPost("");
AddressBookProtos.AddressBook.Builder address = AddressBookProtos.AddressBook
.newBuilder();
for (int i = 0; i < 20000; i++) {
AddressBookProtos.Person.Builder person = AddressBookProtos.Person
.newBuilder();
person.setName("HeavenWang");
person.setId(i);
person.setEmail("wanghouda@126.com");
address.addPerson(person);
}
ByteArrayEntity entity = new ByteArrayEntity(address.build().toByteArray());
httppost.setEntity(entity);
HttpResponse response = httpclient.execute(httppost);
HttpEntity receiveEntity = response.getEntity();
System.out.println("----------------------------------------");
System.out.println(response.getStatusLine());
if (receiveEntity != null) {
System.out.println("Response content length: " + receiveEntity.getContentLength());
}
System.out.println("success");
}
}
服務器端NettyService：
<span >package NettyDemo.echo.server;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
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.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;
import io.netty.handler.codec.http.HttpServerCodec;
import NettyDemo.echo.handler.HttpProtobufServerHandler;
public class HttpProtobufServer {
public static final String IP = "127.0.0.1";
public static final int PORT = 8080;
//private static MessageLite lite=AddressBookProtos.AddressBook.getDefaultInstance();
/**用於分配處理業務線程的線程組個數 */
protected static final int BIZGROUPSIZE = Runtime.getRuntime().availableProcessors()*2; //默認
/** 業務出現線程大小*/
protected static final int BIZTHREADSIZE = 4;
private static final EventLoopGroup bossGroup = new NioEventLoopGroup(BIZGROUPSIZE);
private static final EventLoopGroup workerGroup = new NioEventLoopGroup(BIZTHREADSIZE);
protected static void run() throws Exception {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup);
b.channel(NioServerSocketChannel.class);
b.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline pipeline = ch.pipeline();
pipeline.addLast("decoder", new HttpRequestDecoder());
/**usually we receive http message infragment,if we want full http message,
* we should bundle HttpObjectAggregator and we can get FullHttpRequest。
* 我們通常接收到的是一個http片段，如果要想完整接受一次請求的所有數據，我們需要綁定HttpObjectAggregator，然後我們
* 就可以收到一個FullHttpRequest-是一個完整的請求信息。
**/
pipeline.addLast("servercodec",new HttpServerCodec());
pipeline.addLast("aggegator",new HttpObjectAggregator(1024*1024*64));//定義緩衝數據量
pipeline.addLast(new HttpProtobufServerHandler());
pipeline.addLast("responseencoder",new HttpResponseEncoder());
}
});
b.bind(IP, PORT).sync();
System.out.println("TCP服務器已啟動");
}
protected static void shutdown() {
workerGroup.shutdownGracefully();
bossGroup.shutdownGracefully();
}
public static void main(String[] args) throws Exception {
System.out.println("開始啟動http服務器...");
HttpProtobufServer.run();
// TcpServer.shutdown();
}
}
</span>
Handler:
package NettyDemo.echo.handler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.DefaultFullHttpRequest;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpVersion;
public class HttpProtobufServerHandler extends SimpleChannelInboundHandler<Object>{
@Override
protected void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
DefaultFullHttpRequest request=(DefaultFullHttpRequest)msg;
DefaultFullHttpResponse response=new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.ACCEPTED, request.content());
ctx.writeAndFlush(response);
}
}
附：FullHttpRequest構成，因此一個FullHttpRequest會包含請求message的所有片段。
最後更新：2017-04-03 12:56:00