223efc5f99
Motivation:
The examples have not been updated since long time ago, showing various
issues fixed in this commit.
Modifications:
- Overall simplification to reduce LoC
- Use system properties to get options instead of parsing args.
- Minimize option validation
- Just use System.out/err instead of Logger
- Do not pass config as parameters - just access it directly
- Move the main logic to main(String[]) instead of creating a new
instance meaninglessly
- Update netty-build-21 to make checkstyle not complain
- Remove 'throws Exception' clause if possible
- Line wrap at 120 (previously at 80)
- Add an option to enable SSL for most examples
- Use ChannelFuture.sync() instead of await()
- Use System.out for the actual result. Use System.err otherwise.
- Delete examples that are not very useful:
- applet
- websocket/html5
- websocketx/sslserver
- localecho/multithreaded
- Add run-example.sh which simplifies launching an example from command
line
- Rewrite FileServer example
Result:
Shorter and simpler examples. A user can focus more on what it actually
does than miscellaneous stuff. A user can launch an example very
easily.
74 lines
2.5 KiB
Java
74 lines
2.5 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.example.file;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.DefaultFileRegion;
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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.handler.ssl.SslHandler;
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import io.netty.handler.stream.ChunkedFile;
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import java.io.RandomAccessFile;
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public class FileServerHandler extends SimpleChannelInboundHandler<String> {
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@Override
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public void channelActive(ChannelHandlerContext ctx) {
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ctx.writeAndFlush("HELO: Type the path of the file to retrieve.\n");
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}
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@Override
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public void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
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RandomAccessFile raf = null;
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long length = -1;
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try {
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raf = new RandomAccessFile(msg, "r");
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length = raf.length();
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} catch (Exception e) {
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ctx.writeAndFlush("ERR: " + e.getClass().getSimpleName() + ": " + e.getMessage() + '\n');
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return;
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} finally {
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if (length < 0 && raf != null) {
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raf.close();
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}
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}
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ctx.write("OK: " + raf.length() + '\n');
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if (ctx.pipeline().get(SslHandler.class) == null) {
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// SSL not enabled - can use zero-copy file transfer.
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ctx.write(new DefaultFileRegion(raf.getChannel(), 0, length));
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} else {
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// SSL enabled - cannot use zero-copy file transfer.
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ctx.write(new ChunkedFile(raf));
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}
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ctx.writeAndFlush("\n");
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
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cause.printStackTrace();
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if (ctx.channel().isActive()) {
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ctx.writeAndFlush("ERR: " +
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cause.getClass().getSimpleName() + ": " +
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cause.getMessage() + '\n').addListener(ChannelFutureListener.CLOSE);
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}
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}
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}
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