netty websocket传输图片示例代码
时间: 2023-08-31 13:41:50 浏览: 78
### 回答1:
下面是使用 Netty 实现 WebSocket 图片传输的示例代码。需要注意的是,这个示例代码只是提供一个思路,具体的实现细节可能会有所不同。
首先,在服务端,你需要创建一个 ChannelInboundHandler 来处理来自客户端的 WebSocket 消息。在这个 handler 中,你可以检查消息的类型,如果是二进制消息,就读取它并将图片解码为 BufferedImage 对象。然后,你可以将图片存储在服务端或者将它转发给其他客户端。
```
public class ImageHandler extends SimpleChannelInboundHandler<BinaryWebSocketFrame> {
@Override
protected void channelRead0(ChannelHandlerContext ctx, BinaryWebSocketFrame frame) throws Exception {
// 读取二进制消息并解码为图片
BufferedImage image = ImageIO.read(new ByteArrayInputStream(frame.content().array()));
// 处理图片,例如存储或转发
...
}
}
```
然后,在客户端,你需要创建一个 ChannelOutboundHandler 来处理要发送给服务端的 WebSocket 消息。在这个 handler 中,你可以将图片编码为二进制数据并发送给服务端。
```
public class ImageSender extends ChannelOutboundHandlerAdapter {
public void sendImage(ChannelHandlerContext ctx, BufferedImage image) {
// 将图片编码为二进制数据
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(image, "png", baos);
byte[] data = baos.toByteArray();
// 发送二进制消息
ctx.writeAndFlush(new BinaryWebSocketFrame(Unpooled.wrappedBuffer
### 回答2:
以下是一个使用Netty进行WebSocket传输图片的示例代码:
服务器端代码:
```
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.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.stream.ChunkedWriteHandler;
public class WebSocketServer {
public static void main(String[] args) throws Exception {
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap bootstrap = new ServerBootstrap();
bootstrap.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ch.pipeline()
.addLast(new HttpServerCodec())
.addLast(new HttpObjectAggregator(65536))
.addLast(new ChunkedWriteHandler())
.addLast(new WebSocketServerProtocolHandler("/websocket"))
.addLast(new ImageWebSocketServerHandler());
}
})
.option(ChannelOption.SO_BACKLOG, 128)
.childOption(ChannelOption.SO_KEEPALIVE, true);
ChannelFuture future = bootstrap.bind(8080).sync();
future.channel().closeFuture().sync();
} finally {
workerGroup.shutdownGracefully();
bossGroup.shutdownGracefully();
}
}
}
```
服务器端使用了Netty的WebSocket协议处理器`WebSocketServerProtocolHandler`来支持WebSocket连接,并且根据自定义的图片处理器`ImageWebSocketServerHandler`处理接收到的图片数据。
客户端代码:
```
import io.netty.bootstrap.Bootstrap;
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.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestEncoder;
import io.netty.handler.codec.http.HttpResponseDecoder;
import io.netty.handler.codec.http.websocketx.WebSocketClientProtocolHandler;
public class WebSocketClient {
public static void main(String[] args) throws Exception {
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap bootstrap = new Bootstrap();
bootstrap.group(group)
.channel(NioSocketChannel.class)
.handler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ch.pipeline()
.addLast(new HttpResponseDecoder())
.addLast(new HttpRequestEncoder())
.addLast(new HttpObjectAggregator(65536))
.addLast(new WebSocketClientProtocolHandler("/websocket"))
.addLast(new ImageWebSocketClientHandler());
}
})
.option(ChannelOption.SO_KEEPALIVE, true);
ChannelFuture future = bootstrap.connect("localhost", 8080).sync();
future.channel().closeFuture().sync();
} finally {
group.shutdownGracefully();
}
}
}
```
客户端代码中,同样使用了Netty的WebSocket协议处理器`WebSocketClientProtocolHandler`来支持WebSocket连接,并且根据自定义的图片处理器`ImageWebSocketClientHandler`处理接收到的图片数据。
通过服务器端和客户端的组合使用,可以实现基于Netty的WebSocket传输图片的功能。
### 回答3:
Netty是一种基于Java的网络编程框架,它提供了一种简单而高效的方式来实现网络通信。WebSocket是一种在Web应用程序中实现双向通信的协议。使用Netty实现WebSocket传输图片的示例代码如下:
1.首先,需要添加Netty和WebSocket的依赖到项目中:
```xml
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.1.63.Final</version>
</dependency>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-transport-native-epoll</artifactId>
<version>4.1.63.Final</version>
<classifier>linux-x86_64</classifier>
</dependency>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-codec-http</artifactId>
<version>4.1.63.Final</version>
</dependency>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-handler</artifactId>
<version>4.1.63.Final</version>
</dependency>
```
2.创建一个WebSocket服务器类,用于处理WebSocket请求:
```java
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.stream.ChunkedWriteHandler;
import io.netty.handler.stream.ChunkedNioFile;
import io.netty.handler.stream.ChunkedWriteHandler;
public class WebSocketServer {
public void run(int port) throws Exception {
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap bootstrap = new ServerBootstrap();
bootstrap.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.childHandler(new ChannelInitializer() {
@Override
protected void initChannel(Channel ch) throws Exception {
ch.pipeline().addLast("http-codec", new HttpServerCodec());
ch.pipeline().addLast("aggregator", new HttpObjectAggregator(65536));
ch.pipeline().addLast("http-chunked", new ChunkedWriteHandler());
ch.pipeline().addLast("handler", new WebSocketServerHandler());
}
});
ChannelFuture future = bootstrap.bind(port).sync();
System.out.println("WebSocket server started on port " + port);
future.channel().closeFuture().sync();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
public static void main(String[] args) throws Exception {
new WebSocketServer().run(8080);
}
}
```
3.创建一个WebSocket处理器,用于处理WebSocket请求并传输图片:
```java
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.SimpleChannelInboundHandler;
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.FullHttpRequest;
import io.netty.handler.codec.http.HttpClientCodec;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpVersion;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
public class WebSocketServerHandler extends SimpleChannelInboundHandler<FullHttpRequest> {
private WebSocketServerHandshaker handshaker;
@Override
public void channelRead0(ChannelHandlerContext ctx, FullHttpRequest msg) throws Exception {
if (!msg.decoderResult().isSuccess()) {
sendHttpResponse(ctx, msg, HttpResponseStatus.BAD_REQUEST);
return;
}
if ("/ws".equals(msg.uri())) {
WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory("ws://localhost:8080/ws", null, false);
handshaker = wsFactory.newHandshaker(msg);
if (handshaker == null) {
WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(ctx.channel());
} else {
handshaker.handshake(ctx.channel(), req);
}
} else {
// 处理静态资源请求
// ...
}
}
private void sendHttpResponse(ChannelHandlerContext ctx, FullHttpRequest req, HttpResponseStatus status) {
ByteBuf content = Unpooled.copiedBuffer("Failure: " + status.toString() + "\r\n", CharsetUtil.UTF_8);
FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, status, content);
response.headers().set(HttpHeaders.Names.CONTENT_TYPE, "text/plain; charset=UTF-8");
ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
ctx.flush();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
cause.printStackTrace();
ctx.close();
}
}
```
这段代码创建了一个基于Netty的WebSocket服务器,实现了WebSocket请求处理和图片传输的功能。具体步骤如下:
1.创建一个WebSocket服务器类,使用Netty的`ServerBootstrap`配置服务器,并在`initChannel`方法中添加必要的处理器。
2.在WebSocket服务器类中创建一个`WebSocketServerHandler`类,继承自Netty的`SimpleChannelInboundHandler<FullHttpRequest>`,用于处理WebSocket请求。
3.在`channelRead0`方法中,判断传入的请求是否为WebSocket握手请求,并进行相应处理。
4.如果是WebSocket握手请求,则通过`WebSocketServerHandshakerFactory`创建一个握手器,并进行握手。
5.如果不是WebSocket握手请求,则根据需要处理静态资源请求等。
6.在`sendHttpResponse`方法中,通过`FullHttpResponse`返回相关响应信息。
7.最后,在`main`方法中创建一个新的`WebSocketServer`对象并运行。
以上是一个简单的Netty WebSocket传输图片的示例代码,用于实现图片的传输和处理。
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