HTTP服务案例
案例要求:使用IDEA创建Netty项目
(1)Netty 服务在6688 端口监听,浏览器发出请求 "http://localhost:6688/";
(2)服务器可以回复消息给客户端 "Hello,我是服务器!",并对特定请求资源进行过滤;
(3)目的:Netty 可以做Http 服务开发,并且理解 Handler 实例和客户端及其请求的关系;
服务器端代码:
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 TestServerInitializer());
ChannelFuture channelFuture = serverBootstrap.bind(6688).sync();
channelFuture.channel().closeFuture().sync();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}
通道初始化对象:
public class TestServerInitializer extends ChannelInitializer<SocketChannel> {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
//向管道加入处理器
//得到管道
ChannelPipeline pipeline = ch.pipeline();
//加入一个netty 提供的httpServerCodec codec =>[coder - decoder]
//HttpServerCodec 说明
//1. HttpServerCodec 是netty 提供的处理http的 编-解码器
pipeline.addLast("MyHttpServerCodec", new HttpServerCodec());
//2. 增加一个自定义的handler
pipeline.addLast("MyTestHttpServerHandler", new TestHttpServerHandler());
System.out.println("ok~~~~");
}
}
自定义Handler对象:
/*
说明
1. SimpleChannelInboundHandler 是 ChannelInboundHandlerAdapter 的子类
2. HttpObject 客户端和服务器端相互通讯的数据被封装成 HttpObject
*/
public class TestHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {
//channelRead0 读取客户端数据
@Override
protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
System.out.println("对应的channel=" + ctx.channel() + ",pipeline=" + ctx.pipeline()
+ ",通过pipeline获取channel" + ctx.pipeline().channel());
System.out.println("当前ctx的handler=" + ctx.handler());
//判断 msg 是不是 httpRequest请求
if (msg instanceof HttpRequest) {
System.out.println("ctx 类型 = " + ctx.getClass());
System.out.println("pipeline hashcode = " + ctx.pipeline().hashCode()
+ " TestHttpServerHandler hash =" + this.hashCode());
System.out.println("msg 类型=" + msg.getClass());
System.out.println("客户端地址" + ctx.channel().remoteAddress());
//1.过滤资源
HttpRequest httpRequest = (HttpRequest) msg;
//获取uri, 过滤指定的资源
URI uri = new URI(httpRequest.uri());
if("/favicon.ico".equals(uri.getPath())) {
System.out.println("请求了 favicon.ico, 不做响应");
return;
}
//2.回复信息给浏览器 [http协议]
ByteBuf content = Unpooled.copiedBuffer("hello, 我是服务器", CharsetUtil.UTF_8);
//构造一个http的相应,即 httpResponse
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());
//3.将构建好的 response 返回
ctx.writeAndFlush(response);
}
}
}
测试结果:
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