一、简单的Http请求以及响应过程
a、client客户端请求 服务器端数据。
b、serice 端开始解析client端的数据信息。
c、service端返回给client端数据信息。
4.、client 解析service 返回的信息。
二、 代码实现
1、客户端请求代码
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;
/**
* TODO:
* @author liyong
* @Date 2016年1月22日 下午12:02:21
*/
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());
}
});
ChannelFuture f = b.connect(host, port).sync();
URI uri = new URI("http://127.0.0.1:8844");
String msg = "来自客户端的问候。。。";
System.out.println("客户端请求的信息:" + msg);
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);
}
}
2、客户端 解析代码
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;
/**
* @author liyong
* @Date 2016年1月22日 下午12:03:02
*/
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("客户端接收服务器端返回的内容类型:" + response.headers().get(HttpHeaders.Names.CONTENT_TYPE));
}
if (msg instanceof HttpContent) {
HttpContent content = (HttpContent) msg;
ByteBuf buf = content.content();
System.out.println("客户端接收服务器端返回的内容:" + buf.toString(io.netty.util.CharsetUtil.UTF_8));
buf.release();
}
}
}
3、服务器端解析代码
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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;
/**
* @author liyong
* @Date 2016年1月22日 上午11:59:43
*/
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);
}
}
4、服务器端返回代码
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;
/**
* TODO:
* @author liyong
* @Date 2016年1月22日 下午12:01:18
*/
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("服务器接收客户端请求Uri:" + uri);
}
if (msg instanceof HttpContent) {
HttpContent content = (HttpContent) msg;
ByteBuf buf = content.content();
System.out.println("服务器接收客户端请求的信息:" + buf.toString(io.netty.util.CharsetUtil.UTF_8));
buf.release();
String res = "I am OK";
System.out.println("服务端返回给客户端的信息:" + res);
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();
}
}
三、运行
1、先启动服务器端监听
运行 HttpServer.java 中的 main 方法
2、运行客户端 实现请求数据
运行 HttpClient.java 中的 main 方法
代码中的所用到的 netty-all-4.0.23.Final.jar 和 netty-all-4.0.23.Final-sources.jar
可在 http://pan.baidu.com/s/1gevXVYb 点击打开链接 中下载。