/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.example.filetransfer;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.BufType;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundMessageHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.DefaultFileRegion;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.LineBasedFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.util.CharsetUtil;
import java.io.File;
import java.io.FileInputStream;
/**
* Server that accept the path of a file an echo back its content.
*/
public class FileServer {
private final int port;
public FileServer(int port) {
this.port = port;
}
public void run() throws Exception {
// Configure the server.
ServerBootstrap b = new ServerBootstrap();
try {
b.group(new NioEventLoopGroup(), new NioEventLoopGroup())
.channel(NioServerSocketChannel.class)
.option(ChannelOption.SO_BACKLOG, 100)
.handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(
new StringEncoder(BufType.BYTE, CharsetUtil.UTF_8),
new LineBasedFrameDecoder(8192),
new StringDecoder(CharsetUtil.UTF_8),
new FileHandler());
}
});
// Start the server.
ChannelFuture f = b.bind(port).sync();
// Wait until the server socket is closed.
f.channel().closeFuture().sync();
} finally {
// Shut down all event loops to terminate all threads.
b.shutdown();
}
}
public static void main(String[] args) throws Exception {
int port;
if (args.length > 0) {
port = Integer.parseInt(args[0]);
} else {
port = 8080;
}
new FileServer(port).run();
}
private static final class FileHandler extends ChannelInboundMessageHandlerAdapter<String> {
@Override
public void messageReceived(ChannelHandlerContext ctx, String msg) throws Exception {
File file = new File(msg);
if (file.exists()) {
if (!file.isFile()) {
ctx.write("Not a file: " + file + '\n');
return;
}
ctx.write(file + " " + file.length() + '\n');
ctx.sendFile(new DefaultFileRegion(new FileInputStream(file).getChannel(), 0, file.length()));
ctx.write("\n");
} else {
ctx.write("File not found: " + file + '\n');
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
cause.printStackTrace();
ctx.close();
}
}
}