[ Ngnix与高并发服务器 ] 【守望者 Mina】Mina实现TCP网关模拟

2014-10-12 17:02| 发布者: zhouy | 查看: 2090 | 收藏

摘要: 为大家分享一个Mina2.0实现TCP网关的例子.例子简单,但是包括的内容还是很全,包括Server,Client，Handler,Decoder，Encoder等常用组件.对于初次学习Mina的同学来说还是很不错的例子. 下面具体看代码.1. Decoder--解码 ...

为大家分享一个Mina2.0实现TCP网关的例子.例子简单,但是包括的内容还是很全,包括Server,Client，Handler,Decoder，Encoder等常用组件.对于初次学习Mina的同学来说还是很不错的例子. 下面具体看代码.

1. Decoder--解码器

import org.apache.log4j.Logger;

import org.apache.mina.common.ByteBuffer;

import org.apache.mina.common.IoSession;

import org.apache.mina.filter.codec.ProtocolDecoderOutput;

import org.apache.mina.filter.codec.demux.MessageDecoder;

import org.apache.mina.filter.codec.demux.MessageDecoderResult;

public class GatewayDecoder implements MessageDecoder

{

static final Logger logger = Logger.getLogger( GatewayDecoder.class.getName() );

public GatewayDecoder(){

}

/* 自定义消息格式

* 1 消息长度

* 2 消息的总长度(字节数)，从第一个字节到最后一个字节。

* 3 车载终端ID

* 4 第一个字节是车载终端的厂家编号（从20H～FFH），后四个字节是SIM卡号码(去掉第一个数字1)。

* 5 协议版本号 1 版本号为2

* 6 命令序号 2 从0开始循环累加

* 7 命令ID 1

* 8信息内容 — 不定长

public MessageDecoderResult decodable(IoSession session, ByteBuffer in){

in.mark();

byte[] len = new byte[2];

in.get( len );

// 数据包长度

int datalen = this.getNonSign( len[0] ) * 256 + this.getNonSign( len[1] );

in.reset();

if (in.remaining() >= datalen)

{ // 接收到足够的长度

return MessageDecoderResult.OK;

}

// 其他的情况认为不完整,需要继续接收数据

return MessageDecoderResult.NEED_DATA;

}

public MessageDecoderResult decode(IoSession session, ByteBuffer in, ProtocolDecoderOutput out) throws Exception{

while (true){

in.mark();

byte[] len = new byte[2];

// 数据包长度

int datalen = 0;

if (in.remaining() > 2) {

in.get( len );

datalen = this.getNonSign( len[0] ) * 256 + this.getNonSign( len[1] );

in.reset();

} else if (in.remaining() == 0){

return MessageDecoderResult.OK;

}else{

return MessageDecoderResult.NEED_DATA;

}

if (in.remaining() >= datalen){ // 接收到足够的长度

byte[] data = new byte[datalen];

in.get( data );

ByteBuffer bf = ByteBuffer.wrap( data );

out.write( bf );

}else{

return MessageDecoderResult.NEED_DATA;

}

protected int getNonSign(byte Sign) {

if (Sign < 0){

return (Sign + 256);

} else{

return Sign;

}

public void finishDecode(IoSession session, ProtocolDecoderOutput out) throws Exception{

}

2. Encoder---编码器

import java.util.Collections;

import java.util.HashSet;

import java.util.Set;

import org.apache.mina.common.ByteBuffer;

import org.apache.mina.common.IoSession;

import org.apache.mina.filter.codec.ProtocolEncoderOutput;

import org.apache.mina.filter.codec.demux.MessageEncoder;

public class GatewayEncoder implements MessageEncoder{

private static final Set<Class<?>> TYPES;

static{

Set<Class<?>> types = new HashSet<Class<?>>();

types.add( ByteBuffer.class );

TYPES = Collections.unmodifiableSet( types );

}

public Set<Class<?>> getMessageTypes() {

return GatewayEncoder.TYPES;

}

public GatewayEncoder(){

}

public void encode(IoSession session, Object message, ProtocolEncoderOutput out) throws Exception{

ByteBuffer m = (ByteBuffer) message;

if (m == null){

return;

}

out.write( m );

}

3.ProtocolCodecFactory---编码工厂

import org.apache.mina.filter.codec.ProtocolCodecFactory;

public class GatewayProtocolCodecFactory extends ProtocolCodecFactory{

public GatewayProtocolCodecFactory(){

super.register( GatewayDecoder.class );

super.register( GatewayEncoder.class );

}

4.Handler---业务层类

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetSocketAddress;

import java.net.SocketException;

import org.apache.log4j.Logger;

import org.apache.mina.common.ByteBuffer;

import org.apache.mina.common.IoHandlerAdapter;

import org.apache.mina.common.IoSession;

import com.tz.gps.tcp2udp.main.Main;

public class TransferProtocolHandler extends IoHandlerAdapter {

static Logger logger = Logger.getLogger(TransferProtocolHandler.class);

private static DatagramSocket socket;

public TransferProtocolHandler() {

try {

socket = new DatagramSocket();

} catch (SocketException e) {

logger.error("创建UDP socket失败" + e.getMessage());

}

@Override

public void messageReceived(IoSession arg0, Object arg1) throws Exception {

ByteBuffer buffer = (ByteBuffer) arg1;

buffer.clear();

byte[] b = buffer.array();

DatagramPacket data = new DatagramPacket(b, b.length,

new InetSocketAddress(Main.GATEWAY_IP, Main.GATEWAY_PORT));

socket.send(data);

logger.debug(buffer.duplicate());

}

@Override

public void exceptionCaught(IoSession arg0, Throwable arg1) throws Exception {

logger.error("连接:" + arg0.getRemoteAddress() + " 发送数据时发生错误" + arg1.getMessage());

arg1.printStackTrace();

}

5. Server---服务端监听连接

import java.io.File;

import java.net.InetSocketAddress;

import org.apache.log4j.Logger;

import org.apache.log4j.xml.DOMConfigurator;

import org.apache.mina.common.ByteBuffer;

import org.apache.mina.common.ExecutorThreadModel;

import org.apache.mina.common.IoAcceptor;

import org.apache.mina.common.SimpleByteBufferAllocator;

import org.apache.mina.filter.codec.ProtocolCodecFilter;

import org.apache.mina.transport.socket.nio.SocketAcceptor;

import org.apache.mina.transport.socket.nio.SocketAcceptorConfig;

import org.dom4j.Document;

import org.dom4j.Node;

import org.dom4j.io.SAXReader;

import com.tz.gps.tcp2udp.codec.GatewayProtocolCodecFactory;

import com.tz.gps.tcp2udp.handler.TransferProtocolHandler;

public class Main {

static Logger logger = Logger.getLogger(Main.class);

private int tcpListenPort;

public static String GATEWAY_IP;

public static int GATEWAY_PORT;

public Main(File configFile) {

SAXReader reader = new SAXReader();

try {

Document doc = reader.read(configFile);

Node rootNode = doc.selectSingleNode("tcp2udp");

tcpListenPort = Integer.parseInt(rootNode .selectSingleNode("Server").valueOf("@ListenPort"));

GATEWAY_IP = rootNode.selectSingleNode("Gateway").valueOf("@IP");

GATEWAY_PORT = Integer.parseInt(rootNode.selectSingleNode("Gateway").valueOf("@Port"));

} catch (Exception e) {

logger.error("读入配置文件错误:gwconfig.xml", e);

System.exit(0);

}

public static void main(String[] args) {

DOMConfigurator.configureAndWatch("log4jcfg.xml", 10000);

ByteBuffer.setAllocator(new SimpleByteBufferAllocator());

ByteBuffer.setUseDirectBuffers(false);

File configFile = new File("./config.xml");

new Main(configFile).start();

}

public void start() {

try {

IoAcceptor acceptor = new SocketAcceptor();

SocketAcceptorConfig cfg = new SocketAcceptorConfig();

cfg.setReuseAddress(true);

cfg.getFilterChain().addLast("protocolFilter",

new ProtocolCodecFilter(new GatewayProtocolCodecFactory()));

cfg.setThreadModel(ExecutorThreadModel.getInstance("tmPSListen"));

acceptor.bind(new InetSocketAddress(tcpListenPort),

new TransferProtocolHandler(), cfg);

logger.info((new StringBuilder("启动TCP监听:")).append(tcpListenPort).toString());

} catch (Exception e) {

logger.error("启动TCP监听时错误。", e);

}

6.config.xml文件格式

<?xml version="1.0" encoding='UTF-8'?>

</tcp2udp>

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[ Ngnix与高并发服务器 ] 【守望者 Mina】Mina实现TCP网关模拟

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