Netty:TCP客户端服务器文件传输:异常工具OngFrameException:
我是netty的新手,我正在尝试设计一个解决方案,如下所示,用于通过TCP将文件从服务器传输到客户端:Netty:TCP客户端服务器文件传输:异常工具OngFrameException:,tcp,netty,file-transfer,Tcp,Netty,File Transfer,我是netty的新手,我正在尝试设计一个解决方案,如下所示,用于通过TCP将文件从服务器传输到客户端: 1. Zero copy based file transfer in case of non-ssl based transfer (Using default region of the file) 2. ChunkedFile transfer in case of SSL based transfer. 客户端-服务器文件传输的工作方式如下: 1. The client sends
1. Zero copy based file transfer in case of non-ssl based transfer (Using default region of the file)
2. ChunkedFile transfer in case of SSL based transfer.
客户端-服务器文件传输的工作方式如下:
1. The client sends the location of the file to be transfered
2. Based on the location (sent by the client) the server transfers the file to the client
文件内容可以是任何内容(字符串/图像/pdf等)和任何大小
现在,我在服务器端得到了这个toolongframeeexception:,尽管服务器只是在解码从客户端接收到的路径,以便运行下面提到的代码(服务器/客户端)
现在,我的问题是:
public final class FileClient {
static final boolean SSL = System.getProperty("ssl") != null;
static final int PORT = Integer.parseInt(System.getProperty("port", SSL ? "8992" : "8023"));
static final String HOST = System.getProperty("host", "127.0.0.1");
public static void main(String[] args) throws Exception {
// Configure SSL.
final SslContext sslCtx;
if (SSL) {
SelfSignedCertificate ssc = new SelfSignedCertificate();
sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
} else {
sslCtx = null;
}
// Configure the client
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap b = new Bootstrap();
b.group(group)
.channel(NioSocketChannel.class)
.option(ChannelOption.SO_KEEPALIVE, true)
.handler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline pipeline = ch.pipeline();
if (sslCtx != null) {
pipeline.addLast(sslCtx.newHandler(ch.alloc(), HOST, PORT));
}
pipeline.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(64*1024, 0, 8));
pipeline.addLast("frameEncoder", new LengthFieldPrepender(4));
pipeline.addLast(new ObjectDecoder(ClassResolvers.cacheDisabled(null)));
pipeline.addLast(new ObjectEncoder());
pipeline.addLast( new FileClientHandler()); }
});
// Start the server.
ChannelFuture f = b.connect(HOST,PORT).sync();
// Wait until the server socket is closed.
f.channel().closeFuture().sync();
} finally {
// Shut down all event loops to terminate all threads.
group.shutdownGracefully();
}
}
}
文件服务器:
/**
* Server that accept the path of a file and echo back its content.
*/
public final class FileServer {
static final boolean SSL = System.getProperty("ssl") != null;
static final int PORT = Integer.parseInt(System.getProperty("port", SSL ? "8992" : "8023"));
public static void main(String[] args) throws Exception {
// Configure SSL.
final SslContext sslCtx;
if (SSL) {
SelfSignedCertificate ssc = new SelfSignedCertificate();
sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
} else {
sslCtx = null;
}
// Configure the server.
EventLoopGroup bossGroup = new NioEventLoopGroup(1);
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
.option(ChannelOption.SO_KEEPALIVE, true).handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline pipeline = ch.pipeline();
if (sslCtx != null) {
pipeline.addLast(sslCtx.newHandler(ch.alloc()));
}
pipeline.addLast("frameDecoder",new LengthFieldBasedFrameDecoder(64*1024, 0, 8));
pipeline.addLast("frameEncoder", new LengthFieldPrepender(4));
pipeline.addLast(new ObjectDecoder(ClassResolvers.cacheDisabled(null)));
pipeline.addLast(new ObjectEncoder());
pipeline.addLast(new ChunkedWriteHandler());
pipeline.addLast(new FileServerHandler());
}
});
// Start the server.
ChannelFuture f = b.bind(PORT).sync();
// Wait until the server socket is closed.
f.channel().closeFuture().sync();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}
/**
*接受文件路径并回显其内容的服务器。
*/
公共最终类文件服务器{
静态最终布尔SSL=System.getProperty(“SSL”)!=null;
静态final int PORT=Integer.parseInt(System.getProperty(“PORT”,SSL?“8992”):“8023”);
公共静态void main(字符串[]args)引发异常{
//配置SSL。
最终SslContext sslCtx;
如果(SSL){
SelfSignedCertificate ssc=新的SelfSignedCertificate();
sslCtx=SslContextBuilder.forServer(ssc.certificate(),ssc.privateKey()).build();
}否则{
sslCtx=null;
}
//配置服务器。
EventLoopGroup bossGroup=新的NioEventLoopGroup(1);
EventLoopGroup workerGroup=新的NioEventLoopGroup();
试一试{
ServerBootstrap b=新的ServerBootstrap();
b、 组(bossGroup,workerGroup).channel(nioserverssocketchannel.class)
.option(ChannelOption.SO_KEEPALIVE,true).handler(新的LoggingHandler(LogLevel.INFO))
.childHandler(新的通道初始值设定项(){
@凌驾
public void initChannel(SocketChannel ch)引发异常{
ChannelPipeline=通道管道();
如果(sslCtx!=null){
pipeline.addLast(sslCtx.newHandler(ch.alloc());
}
addLast(“frameDecoder”,新的LengthFieldBasedFrameDecoder(64*1024,0,8));
pipeline.addLast(“帧编码器”,新的LengthFieldPrepender(4));
addLast(新的ObjectDecoder(ClassResolvers.cacheDisabled(null));
addLast(新的ObjectEncoder());
addLast(新的ChunkedWriteHandler());
addLast(新的FileServerHandler());
}
});
//启动服务器。
ChannelFuture f=b.bind(PORT.sync();
//等待服务器套接字关闭。
f、 通道().closeFuture().sync();
}最后{
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}
文件服务器处理程序:
public class FileServerHandler extends ChannelInboundHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object obj) throws Exception {
RandomAccessFile raf = null;
long length = -1;
try {
ByteBuf buff = (ByteBuf)obj;
byte[] bytes = new byte[buff.readableBytes()];
buff.readBytes(bytes);
String msg = new String(bytes);
raf = new RandomAccessFile(msg, "r");
length = raf.length();
} catch (Exception e) {
ctx.writeAndFlush("ERR: " + e.getClass().getSimpleName() + ": " + e.getMessage() + '\n');
return;
} finally {
if (length < 0 && raf != null) {
raf.close();
}
}
if (ctx.pipeline().get(SslHandler.class) == null) {
// SSL not enabled - can use zero-copy file transfer.
ctx.writeAndFlush(new DefaultFileRegion(raf.getChannel(), 0, length));
} else {
// SSL enabled - cannot use zero-copy file transfer.
ctx.writeAndFlush(new ChunkedFile(raf));
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
cause.printStackTrace();
System.out.println("Exception server.....");
}
}
公共类FileServerHandler扩展ChannelInboundHandlerAdapter{
@凌驾
public void channelRead(ChannelHandlerContext ctx,Object obj)引发异常{
RandomAccessFile raf=null;
长长度=-1;
试一试{
ByteBuf buff=(ByteBuf)obj;
byte[]bytes=新字节[buff.readableBytes()];
buff.readBytes(字节);
String msg=新字符串(字节);
raf=新随机访问文件(msg,“r”);
长度=raf.length();
}捕获(例外e){
ctx.writeAndFlush(“错误:“+e.getClass().getSimpleName()+”:“+e.getMessage()+”\n”);
回来
}最后{
if(长度<0&&raf!=null){
raf.close();
}
}
if(ctx.pipeline().get(SslHandler.class)==null){
//SSL未启用-可以使用零拷贝文件传输。
writeAndFlush(新的DefaultFileRegion(raf.getChannel(),0,length));
}否则{
//启用SSL-无法使用零拷贝文件传输。
writeAndFlush(新的ChunkedFile(raf));
}
}
@凌驾
公共无效例外情况(ChannelHandlerContext ctx,可丢弃原因){
cause.printStackTrace();
System.out.println(“异常服务器…”);
}
}
我参考了中的示例并对其进行了编码。您的服务器/客户端存在多个问题。首先是SSL,对于客户端,您不需要为服务器初始化SslContext,而是可以执行以下操作:
sslCtx = SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();
new LengthFieldBasedFrameDecoder(64 * 1024, 0, 4, 0, 4)
//to encode the String
string.getBytes(StandardCharsets.UTF_8);
//to decode the String
new String(bytes, StandardCharsets.UTF_8);
在服务器端,您使用的是SelfSignedCertificate
,它本身并没有错,但希望提醒您,它只应用于调试目的,而不应用于生产。此外,您还使用了channel选项。因此_KEEPALIVE
不推荐使用,因为KEEPALIVE间隔取决于操作系统。此外,您还向管道中添加了对象En-/Decoder
,在您的情况下,该管道没有做任何有用的事情,因此您可以删除它们
此外,由于参数列表不完整且错误,您的LengthFieldBasedFrameDecoder
配置错误。在中,您需要定义lengthFieldLength
和initialBytesToStrip
的构造函数版本。除了不剥离长度字段外,您还定义了错误的lengthFieldLength
,它应该与LengthFieldPrepender
的lengthFieldLength相同
new LengthFieldBasedFrameDecoder(64 * 1024, 0, 4, 0, 4)
//to encode the String
string.getBytes(StandardCharsets.UTF_8);
//to decode the String
new String(bytes, StandardCharsets.UTF_8);
new ChunkedNioFile(randomAccessFile.getChannel())
public class FileTransferHandler extends SimpleChannelInboundHandler<ByteBuf> {
private final Path path;
private final int size;
private final int hash;
private OutputStream outputStream;
private int writtenBytes = 0;
private byte[] buffer = new byte[0];
protected FileTransferHandler(Path path, int size, int hash) {
this.path = path;
this.size = size;
this.hash = hash;
}
@Override
protected void channelRead0(ChannelHandlerContext ctx, ByteBuf byteBuf) throws Exception {
if(this.outputStream == null) {
Files.createDirectories(this.path.getParent());
if(Files.exists(this.path))
Files.delete(this.path);
this.outputStream = Files.newOutputStream(this.path, StandardOpenOption.CREATE, StandardOpenOption.APPEND);
}
int size = byteBuf.readableBytes();
if(size > this.buffer.length)
this.buffer = new byte[size];
byteBuf.readBytes(this.buffer, 0, size);
this.outputStream.write(this.buffer, 0, size);
this.writtenBytes += size;
if(this.writtenBytes == this.size && MurMur3.hash(this.path) != this.hash) {
System.err.println("Received file has wrong hash");
return;
}
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
if(this.outputStream != null)
this.outputStream.close();
}
}