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消息封装 2025年2月22日18:13:31

master
qmstyle 2025-02-22 18:13:37 +08:00
parent b8a9c7d1e7
commit d839ff96ad
6 changed files with 322 additions and 0 deletions
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6
pom.xml
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@ -35,6 +35,12 @@
<version>5.8.27</version>
</dependency>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.1.72.Final</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>

18
src/main/java/com/zhangmeng/service/DataPack.java Normal file
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@ -0,0 +1,18 @@
package com.zhangmeng.service;
/**
* 封包数据和拆包数据
* 直接面向TCP连接中的数据流,为传输数据添加头部信息，用于处理TCP粘包问题。
*
* @author zm
* @date 2025/2/22 17:33
* @version: 1.0
*/
public interface DataPack {
public int GetHeadLen(); //获取包头长度方法
public byte[] Pack(Message msg); //封包方法
public Message Unpack(byte[] data); //拆包方法
}

24
src/main/java/com/zhangmeng/service/Message.java Normal file
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@ -0,0 +1,24 @@
package com.zhangmeng.service;
/**
* 将请求的一个消息封装到message中，定义抽象层接口
*
* @author zm
* @date 2025/2/22 17:26
* @version: 1.0
*/
public interface Message {
public int GetDataLen(); //获取消息数据段长度
public int GetMsgId(); //获取消息ID
public byte[] GetData(); //获取消息内容
public void SetMsgId(int msgId); //设计消息ID
public void SetData(byte[] bytes); //设计消息内容
public void SetDataLen(int length); //设置消息数据段长度
}

44
src/main/java/com/zhangmeng/service/impl/DataPackImpl.java Normal file
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@ -0,0 +1,44 @@
package com.zhangmeng.service.impl;
import com.zhangmeng.service.DataPack;
import com.zhangmeng.service.Message;
import java.nio.ByteBuffer;
/**
* @author zm
* @date 2025/2/22 17:36
* @version: 1.0
*/
public class DataPackImpl implements DataPack {
@Override
public int GetHeadLen() {
return 8;
}
@Override
public byte[] Pack(Message msg) {
ByteBuffer byteBuffer = ByteBuffer.allocate(16);
//写dataLen
byteBuffer.putInt(msg.GetDataLen());
//写msgID
byteBuffer.putInt(msg.GetMsgId());
//写data
byteBuffer.put(msg.GetData());
byte[] data = byteBuffer.array();
return data;
}
@Override
public Message Unpack(byte[] data) {
return null;
}
}

45
src/main/java/com/zhangmeng/service/impl/MessageImpl.java Normal file
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@ -0,0 +1,45 @@
package com.zhangmeng.service.impl;
import com.zhangmeng.service.Message;
/**
* @author zm
* @date 2025/2/22 17:31
* @version: 1.0
*/
public class MessageImpl implements Message {
private int Id; //消息的ID
private int DataLen; //消息的长度
private byte[] Data;//消息的内容
@Override
public int GetDataLen() {
return this.DataLen;
}
@Override
public int GetMsgId() {
return this.Id;
}
@Override
public byte[] GetData() {
return this.Data;
}
@Override
public void SetMsgId(int msgId) {
this.Id = msgId;
}
@Override
public void SetData(byte[] bytes) {
this.Data = bytes;
}
@Override
public void SetDataLen(int length) {
this.DataLen = length;
}
}

185
src/main/java/com/zhangmeng/utils/ByteBufferUtil.java Normal file
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@ -0,0 +1,185 @@
package com.zhangmeng.utils;
import io.netty.util.internal.StringUtil;
import java.nio.ByteBuffer;
import static io.netty.util.internal.MathUtil.isOutOfBounds;
import static io.netty.util.internal.StringUtil.NEWLINE;
/**
* @author zm
* @date 2025/2/22 17:44
* @version: 1.0
*/
public class ByteBufferUtil {
private static final char[] BYTE2CHAR = new char[256];
private static final char[] HEXDUMP_TABLE = new char[256 * 4];
private static final String[] HEXPADDING = new String[16];
private static final String[] HEXDUMP_ROWPREFIXES = new String[65536 >>> 4];
private static final String[] BYTE2HEX = new String[256];
private static final String[] BYTEPADDING = new String[16];
static {
final char[] DIGITS = "0123456789abcdef".toCharArray();
for (int i = 0; i < 256; i++) {
HEXDUMP_TABLE[i << 1] = DIGITS[i >>> 4 & 0x0F];
HEXDUMP_TABLE[(i << 1) + 1] = DIGITS[i & 0x0F];
}
int i;
// Generate the lookup table for hex dump paddings
for (i = 0; i < HEXPADDING.length; i++) {
int padding = HEXPADDING.length - i;
StringBuilder buf = new StringBuilder(padding * 3);
for (int j = 0; j < padding; j++) {
buf.append(" ");
}
HEXPADDING[i] = buf.toString();
}
// Generate the lookup table for the start-offset header in each row (up to 64KiB).
for (i = 0; i < HEXDUMP_ROWPREFIXES.length; i++) {
StringBuilder buf = new StringBuilder(12);
buf.append(NEWLINE);
buf.append(Long.toHexString(i << 4 & 0xFFFFFFFFL | 0x100000000L));
buf.setCharAt(buf.length() - 9, '|');
buf.append('|');
HEXDUMP_ROWPREFIXES[i] = buf.toString();
}
// Generate the lookup table for byte-to-hex-dump conversion
for (i = 0; i < BYTE2HEX.length; i++) {
BYTE2HEX[i] = ' ' + StringUtil.byteToHexStringPadded(i);
}
// Generate the lookup table for byte dump paddings
for (i = 0; i < BYTEPADDING.length; i++) {
int padding = BYTEPADDING.length - i;
StringBuilder buf = new StringBuilder(padding);
for (int j = 0; j < padding; j++) {
buf.append(' ');
}
BYTEPADDING[i] = buf.toString();
}
// Generate the lookup table for byte-to-char conversion
for (i = 0; i < BYTE2CHAR.length; i++) {
if (i <= 0x1f || i >= 0x7f) {
BYTE2CHAR[i] = '.';
} else {
BYTE2CHAR[i] = (char) i;
}
}
}
/**
* 打印所有内容
* @param buffer
*/
public static void debugAll(ByteBuffer buffer) {
int oldlimit = buffer.limit();
buffer.limit(buffer.capacity());
StringBuilder origin = new StringBuilder(256);
appendPrettyHexDump(origin, buffer, 0, buffer.capacity());
System.out.println("+--------+-------------------- all ------------------------+----------------+");
System.out.printf("position: [%d], limit: [%d]\n", buffer.position(), oldlimit);
System.out.println(origin);
buffer.limit(oldlimit);
}
/**
* 打印可读取内容
* @param buffer
*/
public static void debugRead(ByteBuffer buffer) {
StringBuilder builder = new StringBuilder(256);
appendPrettyHexDump(builder, buffer, buffer.position(), buffer.limit() - buffer.position());
System.out.println("+--------+-------------------- read -----------------------+----------------+");
System.out.printf("position: [%d], limit: [%d]\n", buffer.position(), buffer.limit());
System.out.println(builder);
}
private static void appendPrettyHexDump(StringBuilder dump, ByteBuffer buf, int offset, int length) {
if (isOutOfBounds(offset, length, buf.capacity())) {
throw new IndexOutOfBoundsException(
"expected: " + "0 <= offset(" + offset + ") <= offset + length(" + length
+ ") <= " + "buf.capacity(" + buf.capacity() + ')');
}
if (length == 0) {
return;
}
dump.append(
" +-------------------------------------------------+" +
NEWLINE + " | 0 1 2 3 4 5 6 7 8 9 a b c d e f |" +
NEWLINE + "+--------+-------------------------------------------------+----------------+");
final int startIndex = offset;
final int fullRows = length >>> 4;
final int remainder = length & 0xF;
// Dump the rows which have 16 bytes.
for (int row = 0; row < fullRows; row++) {
int rowStartIndex = (row << 4) + startIndex;
// Per-row prefix.
appendHexDumpRowPrefix(dump, row, rowStartIndex);
// Hex dump
int rowEndIndex = rowStartIndex + 16;
for (int j = rowStartIndex; j < rowEndIndex; j++) {
dump.append(BYTE2HEX[getUnsignedByte(buf, j)]);
}
dump.append(" |");
// ASCII dump
for (int j = rowStartIndex; j < rowEndIndex; j++) {
dump.append(BYTE2CHAR[getUnsignedByte(buf, j)]);
}
dump.append('|');
}
// Dump the last row which has less than 16 bytes.
if (remainder != 0) {
int rowStartIndex = (fullRows << 4) + startIndex;
appendHexDumpRowPrefix(dump, fullRows, rowStartIndex);
// Hex dump
int rowEndIndex = rowStartIndex + remainder;
for (int j = rowStartIndex; j < rowEndIndex; j++) {
dump.append(BYTE2HEX[getUnsignedByte(buf, j)]);
}
dump.append(HEXPADDING[remainder]);
dump.append(" |");
// Ascii dump
for (int j = rowStartIndex; j < rowEndIndex; j++) {
dump.append(BYTE2CHAR[getUnsignedByte(buf, j)]);
}
dump.append(BYTEPADDING[remainder]);
dump.append('|');
}
dump.append(NEWLINE +
"+--------+-------------------------------------------------+----------------+");
}
private static void appendHexDumpRowPrefix(StringBuilder dump, int row, int rowStartIndex) {
if (row < HEXDUMP_ROWPREFIXES.length) {
dump.append(HEXDUMP_ROWPREFIXES[row]);
} else {
dump.append(NEWLINE);
dump.append(Long.toHexString(rowStartIndex & 0xFFFFFFFFL | 0x100000000L));
dump.setCharAt(dump.length() - 9, '|');
dump.append('|');
}
}
public static short getUnsignedByte(ByteBuffer buffer, int index) {
return (short) (buffer.get(index) & 0xFF);
}
}