MUTP实现功能

通过这个练手，来对可靠传输有更深的认识，当然肯定不会有tcp那么细节化，前辈们的设计当然是相当的完备

• 三次牵手
• 超时重传
• 处理丢包
• 滑动窗口

目录结构

目录结构1

目录结构2

数据模拟

segment

这里只简单的模拟部分，也可以用byte[4]来实现

• DataPacketHeader

    private boolean ACK;
    private boolean SYN;
    private int ackNum;
    private int seqNum;
    private int packetLength;

• DataPacket

    private DataPacketHeader header;
    private byte[] buf ;
    private int windowSize = 5;

DataPacket类是MUTP传输的基本数据结构

• 创建包的工厂（DataPacketFactory）

package main.common;

/**
 * Created by liqiushi on 2017/11/23.
 */
public class DataPacketFactory {
    public static final String SYN_ONLY = "SYN_ONLY";
    public static final String SYN_ACK = "SYN_ACK";
    public static final String ACK_ONLY = "ACK_ONLY";
    public static final String DATA_ONLY = "DATA_ONLY";
    private DataPacketFactory(){
        
    }
    public static DataPacket getInstance(String pType){
        /**
         * 这里开始连接都ack、seq设为为1
         */
        switch(pType){
            //发出的SYN连接请求
            case SYN_ONLY:
                return new DataPacket(new DataPacketHeader(false,true,-1,0));
            //发出的SYN和ACK，确认发送端的连接请求 ACK  ack = 发送端seq+1
            case SYN_ACK:
                return new DataPacket(new DataPacketHeader(true,true,1,0));
            //最终发送ACK  ack = 接收端seq+1 确认连接
            case ACK_ONLY:
                return new DataPacket(new DataPacketHeader(true,false,1,1));
            case DATA_ONLY:
                return new DataPacket(new DataPacketHeader(false,false,-1,0));
            default:
                break;
        }
        return null;
    }
}