Modbus协议服务端（Netty）
pom.xml
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.0.21.Final</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.7</version>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
Listener
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.FixedLengthFrameDecoder;
import io.netty.handler.timeout.ReadTimeoutHandler;
import io.netty.util.concurrent.DefaultEventExecutorGroup;
import io.netty.util.concurrent.EventExecutorGroup;
import util.Consts;
public class PortalSomCommunicationListener implements Runnable{
private int port;
public PortalSomCommunicationListener(int port) {
this.port = port;
}
@Override
public void run() {
startNettyServer(port);
}
private void startNettyServer(int port) {
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
final EventExecutorGroup businessGroup = new DefaultEventExecutorGroup(10);
try {
// 配置服务器的NIO线程租
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.option(ChannelOption.SO_BACKLOG, 1024)
.childOption(ChannelOption.SO_KEEPALIVE, true)
.childHandler(new ChannelInitializer() {
@Override
protected void initChannel(Channel channel) throws Exception {
channel.pipeline().addLast(new FixedLengthFrameDecoder(12));
// 设置超时时间，防止连接过多。
channel.pipeline().addLast("readtime",new ReadTimeoutHandler(5));
channel.pipeline().addLast(businessGroup, "executer", new SomCommunicationHandler());
}
});
// 绑定端口，同步等待成功
ChannelFuture f = b.bind(port).sync();
// 等待服务端监听端口关闭
f.channel().closeFuture().sync();
} catch(Exception e) {
} finally {
// 优雅退出，释放线程池资源
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
public static void main(String[] args) {
// 异味MODBUS协议
new Thread(new PortalSomCommunicationListener(Consts.YIWEI_PORT)).start();
}
}
Handler
import domain.YiWeiSample;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import net.Client;
import org.apache.commons.codec.binary.Hex;
import util.Consts;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
/**
* 请求：
* 00 00 00 00 00 06 FF 03 00 01 00 00
* | 事务 |协议标识| 长度 | 单元标识 |功能码|起始地址|寄存器地址|
*
* 响应：
* 00 00 00 00 00 06 FF 03 00 01 00 00
* | 事务 |协议标识| 长度 | 单元标识 |功能码|字节个数|请求的数据|
*/
public class SomCommunicationHandler extends ChannelInboundHandlerAdapter {
// 请求指令的长度，此协议指定12个字节长度
private static final int commandSize = 12;
private ByteBuf readBuf;
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
ByteBuf m = (ByteBuf) msg;
Consts.logger.info("SomCommunicationHandler收到SOM的二进制形式指令： " + ByteBufUtil.hexDump(m));
Consts.logger.info("SomCommunicationHandler收到SOM的ASCII形式指令： " + m.toString(Charset.forName("US-ASCII")));
readBuf.writeBytes(m);
m.release();
byte[] bytes = handleData();
if (bytes == null) return;
ctx.channel().writeAndFlush(Unpooled.wrappedBuffer(bytes))
.addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE)
.addListener((ChannelFutureListener) channelFuture -> Consts.logger.info(
"SomCommunicationHandler "
+ this.getClass().getName()
+ "成功发送指令:"
+ Hex.encodeHexString(bytes)));
}
private byte[] handleData() {
while (readBuf.readableBytes() >= commandSize) {
List<Byte> result = new ArrayList<>();
byte[] bytes = new byte[commandSize];
readBuf.readBytes(bytes);
// 事务
result.add(bytes[0]);
result.add(bytes[1]);
// 协议标识
result.add(bytes[2]);
result.add(bytes[3]);
// 起始地址
float startIndex = ByteBuffer.wrap(bytes, 8, 2).getShort();
// 寄存器个数
float numberRegister = ByteBuffer.wrap(bytes, 10, 2).getShort();
// 发送指令
try {
// 数据包 AI + DI
byte[] dataBytes = getData((int) startIndex, (int) numberRegister);
// Length 长度:长度字段以字节计数，包括单元标识和数据字段。
int length = 3 + (dataBytes != null ? dataBytes.length : 0);
byte[] len = numToBytes(length);
addBytes(result, len);
//Unit Identifier 单元标识
result.add((byte) 0xFF);
// Function Code 功能码
result.add((byte) 0x04);
//Byte Count 字节个数
// result.add(numToBytes(dataBytes != null ? dataBytes.length : 0));
byte[] len2 = numToHex8((dataBytes != null ? dataBytes.length : 0));
addBytes(result, len2);
addBytes(result, dataBytes);
return list2byte(result);
} catch (UnsupportedEncodingException e) {
Consts.logger.error(e.getMessage(), e);
}
}
return null;
}
private byte[] list2byte(List<Byte> list) {
if (list == null || list.size() < 0)
return null;
byte[] bytes = new byte[list.size()];
int i = 0;
for (Byte aList : list) {
bytes[i] = aList;
i++;
}
return bytes;
}
/**
* @param startIndex 起始地址是指从数据的第几个字段开始, 1：系统报警， 2。。。12 数据
* @param size 寄存器的个数 = DI + AI， DI有1个，AI有11个
*/
private byte[] getData(int startIndex, int size) throws UnsupportedEncodingException {
// TODO: demo数据。
YiWeiSample sample = new YiWeiSample(
20,
70,
50,
12,
1,
25,
70,
20,
18,
40,
10
);
// // 寄存器地址
// DI：系统报警值，0,1,2,3,4， 1为正常
byte [] di = numToBytes(1); // 1
// AI 请求的数据data，
List<Byte> bytes = new ArrayList<>();
addBytes(bytes, numToBytes(sample.getAvgTemp())); // 2
addBytes(bytes, numToBytes(sample.getAvgHumid())); // 3
addBytes(bytes, numToBytes(sample.getAvgPm10())); // 4
addBytes(bytes, numToBytes(sample.getAvgCo2())); // 5
addBytes(bytes, numToBytes(sample.getInYiwei())); // 6
addBytes(bytes, numToBytes(sample.getInTemp())); // 7
addBytes(bytes, numToBytes(sample.getInPm10())); // 8
addBytes(bytes, numToBytes(sample.getInCo2())); // 9
addBytes(bytes, numToBytes(sample.getOutTemp())); // 10
addBytes(bytes, numToBytes(sample.getOutPm10())); // 11
addBytes(bytes, numToBytes(sample.getOutCo2())); // 12
// 处理一下startIndex, startIndex默认在区间[1,12]，1为DI，AI[2,12]
if (startIndex == 1) {
startIndex = 0;
} else if (startIndex >= 2 && startIndex <= 12) {
startIndex = (startIndex - 2) * 2;
} else {
Consts.logger.error("Data (as requested)获取请求数据失败， Starting Address 起始地址小于2或大于12，为：" + size);
return null;
}
// 寄存器个数
if (size < 0 || size > bytes.size()) {
Consts.logger.error("Data (as requested)获取请求数据失败， Number of Registers 寄存器个数错误，个数为：" + size);
return null;
}
bytes = bytes.subList(startIndex, (size - 1) * 2);
List<Byte> result = new ArrayList<>();
addBytes(result, di);
result.addAll(bytes);
return list2byte(result);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
throws Exception {
Consts.logger.error("DTUHandler exception: " + cause.toString());
ctx.close();
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) {
readBuf = ctx.alloc().buffer();
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) {
readBuf.release();
readBuf = null;
Client.disconnect(ctx.channel());
}
private void addBytes(List<Byte> list, byte[] arr) {
if (arr == null || arr.length == 0) return;
for (byte b : arr) {
list.add(b);
}
}
private static byte[] numToHex8(int b) {
return hexStringToBytes(String.format("%02x", b));
}
private static byte[] numToBytes(int b) {
String hex = String.format("%04x", b);
return hexStringToBytes(hex);
}
private static byte[] hexStringToBytes(String hexString) {
if (hexString == null || hexString.equals("")) {
return null;
}
hexString = hexString.toUpperCase();
int length = hexString.length() / 2;
char[] hexChars = hexString.toCharArray();
byte[] d = new byte[length];
for (int i = 0; i < length; i++) {
int pos = i * 2;
d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
}
return d;
}
private static byte charToByte(char c) {
return (byte) "0123456789ABCDEF".indexOf(c);
}
}
Consts.java
import org.apache.log4j.Logger;
public class Consts {
public static final int YIWEI_PORT = 10000;
public static Logger logger = Logger.getRootLogger();
}
Client.java
import io.netty.channel.Channel;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class Client {
private static final Map<String, Client> devCode2Client;
static {
devCode2Client = new ConcurrentHashMap<>();
}
private static final Map<Channel, String> channel2DevCode = new ConcurrentHashMap<>();
public static void disconnect(Channel channel) {
if (channel2DevCode.containsKey(channel)) {
String devCode = channel2DevCode.get(channel);
devCode2Client.remove(devCode);
channel2DevCode.remove(channel);
}
}
}
YiWeiSample.java
public class YiWeiSample {
private int avgTemp;
private int avgHumid;
private int avgPm10;
private int avgCo2;
private int inYiwei;
private int inTemp;
private int inPm10;
private int inCo2;
private int outTemp;
private int outPm10;
private int outCo2;
private int warnData;
public YiWeiSample(int avgTemp, int avgHumid, int avgPm10, int avgCo2, int inYiwei, int inTemp, int inPm10, int inCo2, int outTemp, int outPm10, int outCo2) {
this.avgTemp = avgTemp;
this.avgHumid = avgHumid;
this.avgPm10 = avgPm10;
this.avgCo2 = avgCo2;
this.inYiwei = inYiwei;
this.inTemp = inTemp;
this.inPm10 = inPm10;
this.inCo2 = inCo2;
this.outTemp = outTemp;
this.outPm10 = outPm10;
this.outCo2 = outCo2;
}
public int getAvgTemp() {
return avgTemp;
}
public void setAvgTemp(int avgTemp) {
this.avgTemp = avgTemp;
}
public int getAvgHumid() {
return avgHumid;
}
public void setAvgHumid(int avgHumid) {
this.avgHumid = avgHumid;
}
public int getAvgPm10() {
return avgPm10;
}
public void setAvgPm10(int avgPm10) {
this.avgPm10 = avgPm10;
}
public int getAvgCo2() {
return avgCo2;
}
public void setAvgCo2(int avgCo2) {
this.avgCo2 = avgCo2;
}
public int getInYiwei() {
return inYiwei;
}
public void setInYiwei(int inYiwei) {
this.inYiwei = inYiwei;
}
public int getInTemp() {
return inTemp;
}
public void setInTemp(int inTemp) {
this.inTemp = inTemp;
}
public int getInPm10() {
return inPm10;
}
public void setInPm10(int inPm10) {
this.inPm10 = inPm10;
}
public int getInCo2() {
return inCo2;
}
public void setInCo2(int inCo2) {
this.inCo2 = inCo2;
}
public int getOutTemp() {
return outTemp;
}
public void setOutTemp(int outTemp) {
this.outTemp = outTemp;
}
public int getOutPm10() {
return outPm10;
}
public void setOutPm10(int outPm10) {
this.outPm10 = outPm10;
}
public int getOutCo2() {
return outCo2;
}
public void setOutCo2(int outCo2) {
this.outCo2 = outCo2;
}
public int getWarnData() {
return warnData;
}
public void setWarnData(int warnData) {
this.warnData = warnData;
}
}
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