java 中byte[] 数组的合并 //System.arraycopy()方法 public static byte[] byteMerger(byte[] bt1, byte[]

    //System.arraycopy()方法
    public static byte[] byteMerger(byte[] bt1, byte[] bt2){  
        byte[] bt3 = new byte[bt1.length+bt2.length];  
        System.arraycopy(bt1, 0, bt3, 0, bt1.length);  
        System.arraycopy(bt2, 0, bt3, bt1.length, bt2.length);  
        return bt3;  
    } 

byte[] recvDataHead = {2,48,48,48,50,48,48,48,48,48,48,3};
        byte[] recvData = DataPackage.buildPkg(cmdh, cmdl, param, param_offset, param_len);
        int length=recvDataHead.length+recvData.length;
        byte[] recvDataFin = new byte[length];

//数组头部添加头部信息；进行数组合并。
        System.arraycopy(recvDataHead, 0, recvDataFin, 0, recvDataHead.length);
        System.arraycopy(recvData, 0, recvDataFin, recvDataHead.length, recvData.length);
        hostMessage.setResponseMsg(recvDataFin);