请求数据失败怎么解决_https与http区别「建议收藏」

概述

主要讲述Netty处理HTTP请求和响应和需要注意的事项

Neey作为HTTP服务器

1. 编写服务器的启动程序

/** * 服务端的启动代码，重点在HttpServerInitializer这个类中,这里指定了pipeline的处理器 */
public class HttpServer { 
   
    private int port ;

    public HttpServer(int port){ 
   
        this.port = port;
    }

    public void start() throws Exception{ 
   
        ServerBootstrap bootstrap = new ServerBootstrap();
        EventLoopGroup boss = new NioEventLoopGroup();
        EventLoopGroup work = new NioEventLoopGroup();
        bootstrap.group(boss,work)
                .handler(new LoggingHandler(LogLevel.DEBUG))
                .channel(NioServerSocketChannel.class)
                .childHandler(new HttpServerInitializer());
        ChannelFuture f = bootstrap.bind(new InetSocketAddress(port)).sync();
        System.out.println(" server start up on port : " + port);
        f.channel().closeFuture().sync();
    }
}

2. 配置服务端的pipeline处理器

public class HttpServerInitializer extends ChannelInitializer<SocketChannel>{ 
   
    @Override
    protected void initChannel(SocketChannel channel) throws Exception { 
   
        ChannelPipeline pipeline = channel.pipeline();
        pipeline.addLast(new HttpServerCodec());// http 编解码
        pipeline.addLast("httpAggregator",new HttpObjectAggregator(512*1024)); // http 消息聚合器512*1024为接收的最大contentlength
        pipeline.addLast(new HttpRequestHandler());// 请求处理器

    }
}

3. 编写请求处理器的业务

public class HttpRequestHandler extends SimpleChannelInboundHandler<FullHttpRequest> { 
   

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

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, FullHttpRequest req) throws Exception { 
   
        if (is100ContinueExpected(req)) { 
   
            // 检测 100 Continue，是否同意接收将要发送过来的实体
            ctx.write(new DefaultFullHttpResponse(HttpVersion.HTTP_1_1,HttpResponseStatus.CONTINUE));
        }
        // 因为经过HttpServerCodec处理器的处理后消息被封装为FullHttpRequest对象
		// 获取请求的uri
        JsonObject json = new JsonObject();
        json.put("method", req.method().name()); // 获取请求方法
        json.put("uri", req.uri()); // 获取请求地址
        // 创建完整的响应对象
        FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1,HttpResponseStatus.OK,Unpooled.copiedBuffer(json.toJsonString(), CharsetUtil.UTF_8));
       // 设置头信息
        response.headers().set(HttpHeaderNames.CONTENT_TYPE, "application/json; charset=UTF-8");
       // 响应写回给客户端,并在协会后断开这个连接
        ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
    }
}

4. 启动服务器

public class Application { 
   
    public static void main(String[] args) throws Exception{ 
   
        HttpServer server = new HttpServer(8081);// 8081为启动端口
        server.start();
    }
}

Netty作为客户端

1. 编写http客户端对象

// 客户端对象，这里处理服务的启动配置和处理器配置
public class HttpClient { 
   
	public static void start(String host,int port){ 
   
	    // 配置一个事件循环组和一个启动器
		EventLoopGroup group = new NioEventLoopGroup();
		Bootstrap bootstrap = new Bootstrap();
		try { 
   
			bootstrap.group(group)
					 .channel(NioSocketChannel.class)
					 .option(ChannelOption.SO_KEEPALIVE, true)
					 .handler(new ChannelInitializer<Channel>() { 
   
						@Override
						protected void initChannel(Channel channel) throws Exception { 
   
							channel.pipeline().addLast(new HttpClientCodec()); // http客户端编解码器
							channel.pipeline().addLast(new HttpObjectAggregator(65536)); // http消息聚合器
							channel.pipeline().addLast(new HttpContentDecompressor()); // 数据解压处理器
							channel.pipeline().addLast(new HttpClientHandler()); // 业务逻辑处理器
						}
					});
			// 异步等待连接上远程http服务器
			ChannelFuture future = bootstrap.connect(host, port).sync();
			// 等待与远程http服务器断开连接
			future.channel().closeFuture().sync();
		} catch (Exception e) { 
   
			e.printStackTrace();
		}finally{ 
   
			group.shutdownGracefully();
		}
	}
	
	public static void main(String[] args) { 
   
		start("127.0.0.1", 8081);
	}
}

2. 编写业务逻辑处理器

public class HttpClientHandler extends ChannelInboundHandlerAdapter { 
   
	@Override
	public void channelActive(ChannelHandlerContext ctx) throws Exception { 
   
	    // 通断被激活时我们发送请求到指定路径
		URI uri = new URI("/user/get");
		FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_0, HttpMethod.GET, uri.toASCIIString());
		// FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, uri.toASCIIString()); // 有时候1.1发送的请求会报400错误
		// 添加请求头，保持长连接
		request.headers().add(HttpHeaderNames.CONNECTION,HttpHeaderValues.KEEP_ALIVE);
		// 添加请求头，确定请求体的长度
		request.headers().add(HttpHeaderNames.CONTENT_LENGTH,request.content().readableBytes());
		// 将请求实体写入出站处理器
		ctx.writeAndFlush(request);
	}
	
	@Override
	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { 
   
		if(msg instanceof FullHttpResponse){ 
   
		    // 收到了http服务器的响应
			FullHttpResponse response = (FullHttpResponse)msg;
			ByteBuf buf = response.content();
			String result = buf.toString(CharsetUtil.UTF_8);
			System.out.println("response -> "+ result);
		}
	}
}

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