netty是一套高性能的通讯架构，这里我用netty实现http服务器实现信息采集功能。主要是利用他现有的hander处理器，解析出request头，做信息采集使用，重写了他自己的hander.
package io.netty.example.http.snoop;
import static io.netty.handler.codec.http.HttpHeaders.getHost;
import static io.netty.handler.codec.http.HttpHeaders.isKeepAlive;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONNECTION;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_LENGTH;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE;
import static io.netty.handler.codec.http.HttpHeaders.Names.COOKIE;
import static io.netty.handler.codec.http.HttpHeaders.Names.SET_COOKIE;
import static io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST;
import static io.netty.handler.codec.http.HttpResponseStatus.OK;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.Cookie;
import io.netty.handler.codec.http.CookieDecoder;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpObject;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.handler.codec.http.QueryStringDecoder;
import io.netty.handler.codec.http.ServerCookieEncoder;
import io.netty.util.CharsetUtil;
public class HttpSnoopServiceTxt extends SimpleChannelInboundHandler<Object> {
private HttpRequest request;
/** Buffer that stores the response content */
private final StringBuilder buf = new StringBuilder();
@Override
protected void channelRead0(ChannelHandlerContext ctx, Object msg)
throws Exception {
// TODO Auto-generated method stub
if (msg instanceof HttpRequest) {
HttpRequest request = this.request = (HttpRequest) msg;
buf.setLength(0);
// hostname
buf.append("HOSTNAME:").append(getHost(request, "unknown"));
// url
buf.append("REQUEST_URI:").append(request.getUri());
// parm
QueryStringDecoder queryStringDecoder = new QueryStringDecoder(request.getUri());
Map<String, List<String>> params = queryStringDecoder.parameters();
if (!params.isEmpty()) {
for (Entry<String, List<String>> p : params.entrySet()) {
String key = p.getKey();
List<String> vals = p.getValue();
for (String val : vals) {
buf.append("PARAM:").append(key).append("=")
.append(val);
}
}
}
//cookie
}
if (msg instanceof HttpContent) {
if (msg instanceof LastHttpContent) {
LastHttpContent trailer = (LastHttpContent) msg;
writeResponse(trailer, ctx);
WriterFile.printtxt(buf.toString());
}
}
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
ctx.flush();
}
private boolean writeResponse(HttpObject currentObj,ChannelHandlerContext ctx) {
boolean keepAlive = isKeepAlive(request);
FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1,
currentObj.getDecoderResult().isSuccess() ? OK : BAD_REQUEST,
Unpooled.copiedBuffer(buf.toString(), CharsetUtil.UTF_8));
response.headers().set(CONTENT_TYPE, "text/plain; charset=UTF-8");
if (keepAlive) {
response.headers().set(CONTENT_LENGTH,
response.content().readableBytes());
response.headers().set(CONNECTION, HttpHeaders.Values.KEEP_ALIVE);
}
ctx.write(response);
return keepAlive;
}
}
/*
* 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.http.snoop;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
/**
* An HTTP server that sends back the content of the received HTTP request
* in a pretty plaintext form.
*/
public class HttpSnoopServer {
private final int port;
public HttpSnoopServer(int port) {
this.port = port;
}
public void run() throws Exception {
// Configure the server.
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.childHandler(new HttpSnoopServerInitializer());
Channel ch = b.bind(port).sync().channel();
ch.closeFuture().sync();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
public static void main(String[] args) throws Exception {
int port;
if (args.length > 0) {
port = 8080;
} else {
port = 8080;
}
new HttpSnoopServer(port).run();
}
}
/*
* 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.http.snoop;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;
public class HttpSnoopServerInitializer extends ChannelInitializer<SocketChannel> {
@Override
public void initChannel(SocketChannel ch) throws Exception {
// Create a default pipeline implementation.
ChannelPipeline p = ch.pipeline();
// Uncomment the following line if you want HTTPS
//SSLEngine engine = SecureChatSslContextFactory.getServerContext().createSSLEngine();
//engine.setUseClientMode(false);
//p.addLast("ssl", new SslHandler(engine));
p.addLast("decoder", new HttpRequestDecoder());
// Uncomment the following line if you don't want to handle HttpChunks.
//p.addLast("aggregator", new HttpObjectAggregator(1048576));
p.addLast("encoder", new HttpResponseEncoder());
// Remove the following line if you don't want automatic content compression.
//p.addLast("deflater", new HttpContentCompressor());
p.addLast("handler", new HttpSnoopServiceTxt());
//p.addLast("handler", new HttpSnoopServerHandler());
}
}