原文地址：https://blog.csdn.net/hylexus/article/details/54987786
本篇文章将介绍JT808协议的解析思路。
1 JT808协议扫盲
1.1 数据类型
| 数据类型 | 描述及要求 |
|---|---|
| BYTE | 无符号单字节整形（字节， 8 位） |
| WORD | 无符号双字节整形（字， 16 位） |
| DWORD | 无符号四字节整形（双字， 32 位） |
| BYTE[n] | n 字节 |
| BCD[n] | 8421 码， n 字节 |
| STRING | GBK 编码，若无数据，置空 |
1.2 消息结构
| 标识位 | 消息头 | 消息体 | 校验码 | 标识位 |
|---|---|---|---|---|
| 1byte(0x7e) | 16byte | 1byte | 1byte(0x7e) |
1.3 消息头
消息ID(0-1) 消息体属性(2-3) 终端手机号(4-9) 消息流水号(10-11) 消息包封装项(12-15)
byte[0-1] 消息ID word(16)
byte[2-3] 消息体属性 word(16)
bit[0-9] 消息体长度
bit[10-12] 数据加密方式
此三位都为 0，表示消息体不加密
第 10 位为 1，表示消息体经过 RSA 算法加密
其它保留
bit[13] 分包
1：消息体卫长消息，进行分包发送处理，具体分包信息由消息包封装项决定
0：则消息头中无消息包封装项字段
bit[14-15] 保留
byte[4-9] 终端手机号或设备ID bcd[6]
根据安装后终端自身的手机号转换
手机号不足12 位，则在前面补 0
byte[10-11] 消息流水号 word(16)
按发送顺序从 0 开始循环累加
byte[12-15] 消息包封装项
byte[0-1] 消息包总数(word(16))
该消息分包后得总包数
byte[2-3] 包序号(word(16))
从 1 开始
如果消息体属性中相关标识位确定消息分包处理,则该项有内容
否则无该项2 解析
整个消息体结构中最复杂的就是消息头了。
2.1 消息体实体类
以下是对整个消息体抽象出来的一个java实体类。
import java.nio.channels.Channel;
public class PackageData {
/**
* 16byte 消息头
*/
protected MsgHeader msgHeader;
// 消息体字节数组
protected byte[] msgBodyBytes;
/**
* 校验码 1byte
*/
protected int checkSum;
//记录每个客户端的channel,以便下发信息给客户端
protected Channel channel;
public MsgHeader getMsgHeader() {
return msgHeader;
}
//TODO set 和 get 方法在此处省略
//消息头
public static class MsgHeader {
// 消息ID
protected int msgId;
/////// ========消息体属性
// byte[2-3]
protected int msgBodyPropsField;
// 消息体长度
protected int msgBodyLength;
// 数据加密方式
protected int encryptionType;
// 是否分包,true==>有消息包封装项
protected boolean hasSubPackage;
// 保留位[14-15]
protected String reservedBit;
/////// ========消息体属性
// 终端手机号
protected String terminalPhone;
// 流水号
protected int flowId;
//////// =====消息包封装项
// byte[12-15]
protected int packageInfoField;
// 消息包总数(word(16))
protected long totalSubPackage;
// 包序号(word(16))这次发送的这个消息包是分包中的第几个消息包, 从 1 开始
protected long subPackageSeq;
//////// =====消息包封装项
//TODO set 和 get 方法在此处省略
}
}
2.2 字节数组到消息体实体类的转换
2.2.1 消息转换器
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import cn.hylexus.jt808.util.BCD8421Operater;
import cn.hylexus.jt808.util.BitOperator;
import cn.hylexus.jt808.vo.PackageData;
import cn.hylexus.jt808.vo.PackageData.MsgHeader;
public class MsgDecoder {
private static final Logger log = LoggerFactory.getLogger(MsgDecoder.class);
private BitOperator bitOperator;
private BCD8421Operater bcd8421Operater;
public MsgDecoder() {
this.bitOperator = new BitOperator();
this.bcd8421Operater = new BCD8421Operater();
}
//字节数组到消息体实体类
public PackageData queueElement2PackageData(byte[] data) {
PackageData ret = new PackageData();
// 1. 16byte 或 12byte 消息头
MsgHeader msgHeader = this.parseMsgHeaderFromBytes(data);
ret.setMsgHeader(msgHeader);
int msgBodyByteStartIndex = 12;
// 2. 消息体
// 有子包信息,消息体起始字节后移四个字节:消息包总数(word(16))+包序号(word(16))
if (msgHeader.isHasSubPackage()) {
msgBodyByteStartIndex = 16;
}
byte[] tmp = new byte[msgHeader.getMsgBodyLength()];
System.arraycopy(data, msgBodyByteStartIndex, tmp, 0, tmp.length);
ret.setMsgBodyBytes(tmp);
// 3. 去掉分隔符之后，最后一位就是校验码
// int checkSumInPkg =
// this.bitOperator.oneByteToInteger(data[data.length - 1]);
int checkSumInPkg = data[data.length - 1];
int calculatedCheckSum = this.bitOperator.getCheckSum4JT808(data, 0, data.length - 1);
ret.setCheckSum(checkSumInPkg);
if (checkSumInPkg != calculatedCheckSum) {
log.warn("检验码不一致,msgid:{},pkg:{},calculated:{}", msgHeader.getMsgId(), checkSumInPkg, calculatedCheckSum);
}
return ret;
}
private MsgHeader parseMsgHeaderFromBytes(byte[] data) {
MsgHeader msgHeader = new MsgHeader();
// 1. 消息ID word(16)
// byte[] tmp = new byte[2];
// System.arraycopy(data, 0, tmp, 0, 2);
// msgHeader.setMsgId(this.bitOperator.twoBytesToInteger(tmp));
msgHeader.setMsgId(this.parseIntFromBytes(data, 0, 2));
// 2. 消息体属性 word(16)=================>
// System.arraycopy(data, 2, tmp, 0, 2);
// int msgBodyProps = this.bitOperator.twoBytesToInteger(tmp);
int msgBodyProps = this.parseIntFromBytes(data, 2, 2);
msgHeader.setMsgBodyPropsField(msgBodyProps);
// [ 0-9 ] 0000,0011,1111,1111(3FF)(消息体长度)
msgHeader.setMsgBodyLength(msgBodyProps & 0x1ff);
// [10-12] 0001,1100,0000,0000(1C00)(加密类型)
msgHeader.setEncryptionType((msgBodyProps & 0xe00) >> 10);
// [ 13_ ] 0010,0000,0000,0000(2000)(是否有子包)
msgHeader.setHasSubPackage(((msgBodyProps & 0x2000) >> 13) == 1);
// [14-15] 1100,0000,0000,0000(C000)(保留位)
msgHeader.setReservedBit(((msgBodyProps & 0xc000) >> 14) + "");
// 消息体属性 word(16)<=================
// 3. 终端手机号 bcd[6]
// tmp = new byte[6];
// System.arraycopy(data, 4, tmp, 0, 6);
// msgHeader.setTerminalPhone(this.bcd8421Operater.bcd2String(tmp));
msgHeader.setTerminalPhone(this.parseBcdStringFromBytes(data, 4, 6));
// 4. 消息流水号 word(16) 按发送顺序从 0 开始循环累加
// tmp = new byte[2];
// System.arraycopy(data, 10, tmp, 0, 2);
// msgHeader.setFlowId(this.bitOperator.twoBytesToInteger(tmp));
msgHeader.setFlowId(this.parseIntFromBytes(data, 10, 2));
// 5. 消息包封装项
// 有子包信息
if (msgHeader.isHasSubPackage()) {
// 消息包封装项字段
msgHeader.setPackageInfoField(this.parseIntFromBytes(data, 12, 4));
// byte[0-1] 消息包总数(word(16))
// tmp = new byte[2];
// System.arraycopy(data, 12, tmp, 0, 2);
// msgHeader.setTotalSubPackage(this.bitOperator.twoBytesToInteger(tmp));
msgHeader.setTotalSubPackage(this.parseIntFromBytes(data, 12, 2));
// byte[2-3] 包序号(word(16)) 从 1 开始
// tmp = new byte[2];
// System.arraycopy(data, 14, tmp, 0, 2);
// msgHeader.setSubPackageSeq(this.bitOperator.twoBytesToInteger(tmp));
msgHeader.setSubPackageSeq(this.parseIntFromBytes(data, 12, 2));
}
return msgHeader;
}
protected String parseStringFromBytes(byte[] data, int startIndex, int lenth) {
return this.parseStringFromBytes(data, startIndex, lenth, null);
}
private String parseStringFromBytes(byte[] data, int startIndex, int lenth, String defaultVal) {
try {
byte[] tmp = new byte[lenth];
System.arraycopy(data, startIndex, tmp, 0, lenth);
return new String(tmp, "UTF-8");
} catch (Exception e) {
log.error("解析字符串出错:{}", e.getMessage());
e.printStackTrace();
return defaultVal;
}
}
private String parseBcdStringFromBytes(byte[] data, int startIndex, int lenth) {
return this.parseBcdStringFromBytes(data, startIndex, lenth, null);
}
private String parseBcdStringFromBytes(byte[] data, int startIndex, int lenth, String defaultVal) {
try {
byte[] tmp = new byte[lenth];
System.arraycopy(data, startIndex, tmp, 0, lenth);
return this.bcd8421Operater.bcd2String(tmp);
} catch (Exception e) {
log.error("解析BCD(8421码)出错:{}", e.getMessage());
e.printStackTrace();
return defaultVal;
}
}
private int parseIntFromBytes(byte[] data, int startIndex, int length) {
return this.parseIntFromBytes(data, startIndex, length, 0);
}
private int parseIntFromBytes(byte[] data, int startIndex, int length, int defaultVal) {
try {
// 字节数大于4,从起始索引开始向后处理4个字节,其余超出部分丢弃
final int len = length > 4 ? 4 : length;
byte[] tmp = new byte[len];
System.arraycopy(data, startIndex, tmp, 0, len);
return bitOperator.byteToInteger(tmp);
} catch (Exception e) {
log.error("解析整数出错:{}", e.getMessage());
e.printStackTrace();
return defaultVal;
}
}
}2.2.2 用到的工具类
2.2.2.1 BCD操作工具类
package cn.hylexus.jt808.util;
public class BCD8421Operater {
/**
* BCD字节数组===>String
*
* @param bytes
* @return 十进制字符串
*/
public String bcd2String(byte[] bytes) {
StringBuilder temp = new StringBuilder(bytes.length * 2);
for (int i = 0; i < bytes.length; i++) {
// 高四位
temp.append((bytes[i] & 0xf0) >>> 4);
// 低四位
temp.append(bytes[i] & 0x0f);
}
return temp.toString().substring(0, 1).equalsIgnoreCase("0") ? temp.toString().substring(1) : temp.toString();
}
/**
* 字符串==>BCD字节数组
*
* @param str
* @return BCD字节数组
*/
public byte[] string2Bcd(String str) {
// 奇数,前补零
if ((str.length() & 0x1) == 1) {
str = "0" + str;
}
byte ret[] = new byte[str.length() / 2];
byte bs[] = str.getBytes();
for (int i = 0; i < ret.length; i++) {
byte high = ascII2Bcd(bs[2 * i]);
byte low = ascII2Bcd(bs[2 * i + 1]);
// TODO 只遮罩BCD低四位?
ret[i] = (byte) ((high << 4) | low);
}
return ret;
}
private byte ascII2Bcd(byte asc) {
if ((asc >= '0') && (asc <= '9'))
return (byte) (asc - '0');
else if ((asc >= 'A') && (asc <= 'F'))
return (byte) (asc - 'A' + 10);
else if ((asc >= 'a') && (asc <= 'f'))
return (byte) (asc - 'a' + 10);
else
return (byte) (asc - 48);
}
}
2.2.2.2 位操作工具类
package cn.hylexus.jt808.util;
import java.util.Arrays;
import java.util.List;
public class BitOperator {
/**
* 把一个整形该为byte
*
* @param value
* @return
* @throws Exception
*/
public byte integerTo1Byte(int value) {
return (byte) (value & 0xFF);
}
/**
* 把一个整形该为1位的byte数组
*
* @param value
* @return
* @throws Exception
*/
public byte[] integerTo1Bytes(int value) {
byte[] result = new byte[1];
result[0] = (byte) (value & 0xFF);
return result;
}
/**
* 把一个整形改为2位的byte数组
*
* @param value
* @return
* @throws Exception
*/
public byte[] integerTo2Bytes(int value) {
byte[] result = new byte[2];
result[0] = (byte) ((value >>> 8) & 0xFF);
result[1] = (byte) (value & 0xFF);
return result;
}
/**
* 把一个整形改为3位的byte数组
*
* @param value
* @return
* @throws Exception
*/
public byte[] integerTo3Bytes(int value) {
byte[] result = new byte[3];
result[0] = (byte) ((value >>> 16) & 0xFF);
result[1] = (byte) ((value >>> 8) & 0xFF);
result[2] = (byte) (value & 0xFF);
return result;
}
/**
* 把一个整形改为4位的byte数组
*
* @param value
* @return
* @throws Exception
*/
public byte[] integerTo4Bytes(int value){
byte[] result = new byte[4];
result[0] = (byte) ((value >>> 24) & 0xFF);
result[1] = (byte) ((value >>> 16) & 0xFF);
result[2] = (byte) ((value >>> 8) & 0xFF);
result[3] = (byte) (value & 0xFF);
return result;
}
/**
* 把byte[]转化位整形,通常为指令用
*
* @param value
* @return
* @throws Exception
*/
public int byteToInteger(byte[] value) {
int result;
if (value.length == 1) {
result = oneByteToInteger(value[0]);
} else if (value.length == 2) {
result = twoBytesToInteger(value);
} else if (value.length == 3) {
result = threeBytesToInteger(value);
} else if (value.length == 4) {
result = fourBytesToInteger(value);
} else {
result = fourBytesToInteger(value);
}
return result;
}
/**
* 把一个byte转化位整形,通常为指令用
*
* @param value
* @return
* @throws Exception
*/
public int oneByteToInteger(byte value) {
return (int) value & 0xFF;
}
/**
* 把一个2位的数组转化位整形
*
* @param value
* @return
* @throws Exception
*/
public int twoBytesToInteger(byte[] value) {
// if (value.length < 2) {
// throw new Exception("Byte array too short!");
// }
int temp0 = value[0] & 0xFF;
int temp1 = value[1] & 0xFF;
return ((temp0 << 8) + temp1);
}
/**
* 把一个3位的数组转化位整形
*
* @param value
* @return
* @throws Exception
*/
public int threeBytesToInteger(byte[] value) {
int temp0 = value[0] & 0xFF;
int temp1 = value[1] & 0xFF;
int temp2 = value[2] & 0xFF;
return ((temp0 << 16) + (temp1 << 8) + temp2);
}
/**
* 把一个4位的数组转化位整形,通常为指令用
*
* @param value
* @return
* @throws Exception
*/
public int fourBytesToInteger(byte[] value) {
// if (value.length < 4) {
// throw new Exception("Byte array too short!");
// }
int temp0 = value[0] & 0xFF;
int temp1 = value[1] & 0xFF;
int temp2 = value[2] & 0xFF;
int temp3 = value[3] & 0xFF;
return ((temp0 << 24) + (temp1 << 16) + (temp2 << 8) + temp3);
}
/**
* 把一个4位的数组转化位整形
*
* @param value
* @return
* @throws Exception
*/
public long fourBytesToLong(byte[] value) throws Exception {
// if (value.length < 4) {
// throw new Exception("Byte array too short!");
// }
int temp0 = value[0] & 0xFF;
int temp1 = value[1] & 0xFF;
int temp2 = value[2] & 0xFF;
int temp3 = value[3] & 0xFF;
return (((long) temp0 << 24) + (temp1 << 16) + (temp2 << 8) + temp3);
}
/**
* 把一个数组转化长整形
*
* @param value
* @return
* @throws Exception
*/
public long bytes2Long(byte[] value) {
long result = 0;
int len = value.length;
int temp;
for (int i = 0; i < len; i++) {
temp = (len - 1 - i) * 8;
if (temp == 0) {
result += (value[i] & 0x0ff);
} else {
result += (value[i] & 0x0ff) << temp;
}
}
return result;
}
/**
* 把一个长整形改为byte数组
*
* @param value
* @return
* @throws Exception
*/
public byte[] longToBytes(long value){
return longToBytes(value, 8);
}
/**
* 把一个长整形改为byte数组
*
* @param value
* @return
* @throws Exception
*/
public byte[] longToBytes(long value, int len) {
byte[] result = new byte[len];
int temp;
for (int i = 0; i < len; i++) {
temp = (len - 1 - i) * 8;
if (temp == 0) {
result[i] += (value & 0x0ff);
} else {
result[i] += (value >>> temp) & 0x0ff;
}
}
return result;
}
/**
* 得到一个消息ID
*
* @return
* @throws Exception
*/
public byte[] generateTransactionID() throws Exception {
byte[] id = new byte[16];
System.arraycopy(integerTo2Bytes((int) (Math.random() * 65536)), 0, id, 0, 2);
System.arraycopy(integerTo2Bytes((int) (Math.random() * 65536)), 0, id, 2, 2);
System.arraycopy(integerTo2Bytes((int) (Math.random() * 65536)), 0, id, 4, 2);
System.arraycopy(integerTo2Bytes((int) (Math.random() * 65536)), 0, id, 6, 2);
System.arraycopy(integerTo2Bytes((int) (Math.random() * 65536)), 0, id, 8, 2);
System.arraycopy(integerTo2Bytes((int) (Math.random() * 65536)), 0, id, 10, 2);
System.arraycopy(integerTo2Bytes((int) (Math.random() * 65536)), 0, id, 12, 2);
System.arraycopy(integerTo2Bytes((int) (Math.random() * 65536)), 0, id, 14, 2);
return id;
}
/**
* 把IP拆分位int数组
*
* @param ip
* @return
* @throws Exception
*/
public int[] getIntIPValue(String ip) throws Exception {
String[] sip = ip.split("[.]");
// if (sip.length != 4) {
// throw new Exception("error IPAddress");
// }
int[] intIP = { Integer.parseInt(sip[0]), Integer.parseInt(sip[1]), Integer.parseInt(sip[2]),
Integer.parseInt(sip[3]) };
return intIP;
}
/**
* 把byte类型IP地址转化位字符串
*
* @param address
* @return
* @throws Exception
*/
public String getStringIPValue(byte[] address) throws Exception {
int first = this.oneByteToInteger(address[0]);
int second = this.oneByteToInteger(address[1]);
int third = this.oneByteToInteger(address[2]);
int fourth = this.oneByteToInteger(address[3]);
return first + "." + second + "." + third + "." + fourth;
}
/**
* 合并字节数组
*
* @param first
* @param rest
* @return
*/
public byte[] concatAll(byte[] first, byte[]... rest) {
int totalLength = first.length;
for (byte[] array : rest) {
if (array != null) {
totalLength += array.length;
}
}
byte[] result = Arrays.copyOf(first, totalLength);
int offset = first.length;
for (byte[] array : rest) {
if (array != null) {
System.arraycopy(array, 0, result, offset, array.length);
offset += array.length;
}
}
return result;
}
/**
* 合并字节数组
*
* @param rest
* @return
*/
public byte[] concatAll(List<byte[]> rest) {
int totalLength = 0;
for (byte[] array : rest) {
if (array != null) {
totalLength += array.length;
}
}
byte[] result = new byte[totalLength];
int offset = 0;
for (byte[] array : rest) {
if (array != null) {
System.arraycopy(array, 0, result, offset, array.length);
offset += array.length;
}
}
return result;
}
public float byte2Float(byte[] bs) {
return Float.intBitsToFloat(
(((bs[3] & 0xFF) << 24) + ((bs[2] & 0xFF) << 16) + ((bs[1] & 0xFF) << 8) + (bs[0] & 0xFF)));
}
public float byteBE2Float(byte[] bytes) {
int l;
l = bytes[0];
l &= 0xff;
l |= ((long) bytes[1] << 8);
l &= 0xffff;
l |= ((long) bytes[2] << 16);
l &= 0xffffff;
l |= ((long) bytes[3] << 24);
return Float.intBitsToFloat(l);
}
public int getCheckSum4JT808(byte[] bs, int start, int end) {
if (start < 0 || end > bs.length)
throw new ArrayIndexOutOfBoundsException("getCheckSum4JT808 error : index out of bounds(start=" + start
+ ",end=" + end + ",bytes length=" + bs.length + ")");
int cs = 0;
for (int i = start; i < end; i++) {
cs ^= bs[i];
}
return cs;
}
public int getBitRange(int number, int start, int end) {
if (start < 0)
throw new IndexOutOfBoundsException("min index is 0,but start = " + start);
if (end >= Integer.SIZE)
throw new IndexOutOfBoundsException("max index is " + (Integer.SIZE - 1) + ",but end = " + end);
return (number << Integer.SIZE - (end + 1)) >>> Integer.SIZE - (end - start + 1);
}
public int getBitAt(int number, int index) {
if (index < 0)
throw new IndexOutOfBoundsException("min index is 0,but " + index);
if (index >= Integer.SIZE)
throw new IndexOutOfBoundsException("max index is " + (Integer.SIZE - 1) + ",but " + index);
return ((1 << index) & number) >> index;
}
public int getBitAtS(int number, int index) {
String s = Integer.toBinaryString(number);
return Integer.parseInt(s.charAt(index) + "");
}
@Deprecated
public int getBitRangeS(int number, int start, int end) {
String s = Integer.toBinaryString(number);
StringBuilder sb = new StringBuilder(s);
while (sb.length() < Integer.SIZE) {
sb.insert(0, "0");
}
String tmp = sb.reverse().substring(start, end + 1);
sb = new StringBuilder(tmp);
return Integer.parseInt(sb.reverse().toString(), 2);
}
}2.3 和netty结合
2.3.1 netty处理器链
import java.util.concurrent.TimeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import cn.kkbc.tpms.tcp.service.TCPServerHandler;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.timeout.IdleStateHandler;
import io.netty.util.concurrent.Future;
public class TCPServer2 {
private Logger log = LoggerFactory.getLogger(getClass());
private volatile boolean isRunning = false;
private EventLoopGroup bossGroup = null;
private EventLoopGroup workerGroup = null;
private int port;
public TCPServer2() {
}
public TCPServer2(int port) {
this();
this.port = port;
}
private void bind() throws Exception {
this.bossGroup = new NioEventLoopGroup();
this.workerGroup = new NioEventLoopGroup();
ServerBootstrap serverBootstrap = new ServerBootstrap();
serverBootstrap.group(bossGroup, workerGroup)//
.channel(NioServerSocketChannel.class) //
.childHandler(new ChannelInitializer<SocketChannel>() { //
@Override
public void initChannel(SocketChannel ch) throws Exception {
//超过15分钟未收到客户端消息则自动断开客户端连接
ch.pipeline().addLast("idleStateHandler",
new IdleStateHandler(15, 0, 0, TimeUnit.MINUTES));
//ch.pipeline().addLast(new Decoder4LoggingOnly());
// 1024表示单条消息的最大长度，解码器在查找分隔符的时候，达到该长度还没找到的话会抛异常
ch.pipeline().addLast(
new DelimiterBasedFrameDecoder(1024, Unpooled.copiedBuffer(new byte[] { 0x7e }),
Unpooled.copiedBuffer(new byte[] { 0x7e, 0x7e })));
ch.pipeline().addLast(new TCPServerHandler());
}
}).option(ChannelOption.SO_BACKLOG, 128) //
.childOption(ChannelOption.SO_KEEPALIVE, true);
this.log.info("TCP服务启动完毕,port={}", this.port);
ChannelFuture channelFuture = serverBootstrap.bind(port).sync();
channelFuture.channel().closeFuture().sync();
}
public synchronized void startServer() {
if (this.isRunning) {
throw new IllegalStateException(this.getName() + " is already started .");
}
this.isRunning = true;
new Thread(() -> {
try {
this.bind();
} catch (Exception e) {
this.log.info("TCP服务启动出错:{}", e.getMessage());
e.printStackTrace();
}
}, this.getName()).start();
}
public synchronized void stopServer() {
if (!this.isRunning) {
throw new IllegalStateException(this.getName() + " is not yet started .");
}
this.isRunning = false;
try {
Future<?> future = this.workerGroup.shutdownGracefully().await();
if (!future.isSuccess()) {
log.error("workerGroup 无法正常停止:{}", future.cause());
}
future = this.bossGroup.shutdownGracefully().await();
if (!future.isSuccess()) {
log.error("bossGroup 无法正常停止:{}", future.cause());
}
} catch (InterruptedException e) {
e.printStackTrace();
}
this.log.info("TCP服务已经停止...");
}
private String getName() {
return "TCP-Server";
}
public static void main(String[] args) throws Exception {
TCPServer2 server = new TCPServer2(20048);
server.startServer();
// Thread.sleep(3000);
// server.stopServer();
}
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2.3.2 netty针对于JT808的消息处理器
package cn.hylexus.jt808.service;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import cn.hylexus.jt808.server.SessionManager;
import cn.hylexus.jt808.service.codec.MsgDecoder;
import cn.hylexus.jt808.vo.PackageData;
import cn.hylexus.jt808.vo.Session;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.timeout.IdleState;
import io.netty.handler.timeout.IdleStateEvent;
import io.netty.util.ReferenceCountUtil;
public class TCPServerHandler extends ChannelInboundHandlerAdapter { // (1)
private final Logger logger = LoggerFactory.getLogger(getClass());
// 一个维护客户端连接的类
private final SessionManager sessionManager;
private MsgDecoder decoder = new MsgDecoder();
public TCPServerHandler() {
this.sessionManager = SessionManager.getInstance();
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws InterruptedException { // (2)
try {
ByteBuf buf = (ByteBuf) msg;
if (buf.readableBytes() <= 0) {
// ReferenceCountUtil.safeRelease(msg);
return;
}
byte[] bs = new byte[buf.readableBytes()];
buf.readBytes(bs);
PackageData jt808Msg = this.decoder.queueElement2PackageData(bs);
// 处理客户端消息
this.processClientMsg(jt808Msg);
} finally {
release(msg);
}
}
private void processClientMsg(PackageData jt808Msg) {
// TODO 更加消息ID的不同,分别实现自己的业务逻辑
if (jt808Msg.getMsgHeader().getMsgId() == 0x900) {
// TODO ...
} else if (jt808Msg.getMsgHeader().getMsgId() == 0x9001) {
// TODO ...
}
// else if(){}
// else if(){}
// else if(){}
// else if(){}
// ...
else {
logger.error("位置消息,消息ID={}", jt808Msg.getMsgHeader().getMsgId());
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) { // (4)
logger.error("发生异常:{}", cause.getMessage());
cause.printStackTrace();
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
Session session = Session.buildSession(ctx.channel());
sessionManager.put(session.getId(), session);
logger.debug("终端连接:{}", session);
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
final String sessionId = ctx.channel().id().asLongText();
Session session = sessionManager.findBySessionId(sessionId);
this.sessionManager.removeBySessionId(sessionId);
logger.debug("终端断开连接:{}", session);
ctx.channel().close();
// ctx.close();
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
if (IdleStateEvent.class.isAssignableFrom(evt.getClass())) {
IdleStateEvent event = (IdleStateEvent) evt;
if (event.state() == IdleState.READER_IDLE) {
Session session = this.sessionManager.removeBySessionId(Session.buildId(ctx.channel()));
logger.error("服务器主动断开连接:{}", session);
ctx.close();
}
}
}
private void release(Object msg) {
try {
ReferenceCountUtil.release(msg);
} catch (Exception e) {
e.printStackTrace();
}
}
}2.3.3 用到的其他类
package cn.hylexus.jt808.server;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.BiConsumer;
import java.util.stream.Collectors;
import cn.hylexus.jt808.vo.Session;
public class SessionManager {
private static volatile SessionManager instance = null;
// netty生成的sessionID和Session的对应关系
private Map<String, Session> sessionIdMap;
// 终端手机号和netty生成的sessionID的对应关系
private Map<String, String> phoneMap;
public static SessionManager getInstance() {
if (instance == null) {
synchronized (SessionManager.class) {
if (instance == null) {
instance = new SessionManager();
}
}
}
return instance;
}
public SessionManager() {
this.sessionIdMap = new ConcurrentHashMap<>();
this.phoneMap = new ConcurrentHashMap<>();
}
public boolean containsKey(String sessionId) {
return sessionIdMap.containsKey(sessionId);
}
public boolean containsSession(Session session) {
return sessionIdMap.containsValue(session);
}
public Session findBySessionId(String id) {
return sessionIdMap.get(id);
}
public Session findByTerminalPhone(String phone) {
String sessionId = this.phoneMap.get(phone);
if (sessionId == null)
return null;
return this.findBySessionId(sessionId);
}
public synchronized Session put(String key, Session value) {
if (value.getTerminalPhone() != null && !"".equals(value.getTerminalPhone().trim())) {
this.phoneMap.put(value.getTerminalPhone(), value.getId());
}
return sessionIdMap.put(key, value);
}
public synchronized Session removeBySessionId(String sessionId) {
if (sessionId == null)
return null;
Session session = sessionIdMap.remove(sessionId);
if (session == null)
return null;
if (session.getTerminalPhone() != null)
this.phoneMap.remove(session.getTerminalPhone());
return session;
}
public Set<String> keySet() {
return sessionIdMap.keySet();
}
public void forEach(BiConsumer<? super String, ? super Session> action) {
sessionIdMap.forEach(action);
}
public Set<Entry<String, Session>> entrySet() {
return sessionIdMap.entrySet();
}
public List<Session> toList() {
return this.sessionIdMap.entrySet().stream().map(e -> e.getValue()).collect(Collectors.toList());
}
}3 demo级别java示例
请移步: https://github.com/hylexus/jt-808-protocol