java中long,int,short与byte数组之间的转换

//long类型转成byte数组 
  public static byte[] longToByte(long number) { 
        long temp = number; 
        byte[] b = new byte[8]; 
        for (int i = 0; i < b.length; i++) { 
            b[i] = new Long(temp & 0xff).byteValue();// 
将最低位保存在最低位 
            temp = temp >> 8; // 向右移8位 
        } 
        return b; 
    } 
    
    //byte数组转成long 
    public static long byteToLong(byte[] b) { 
        long s = 0; 
        long s0 = b[0] & 0xff;// 最低位 
        long s1 = b[1] & 0xff; 
        long s2 = b[2] & 0xff; 
        long s3 = b[3] & 0xff; 
        long s4 = b[4] & 0xff;// 最低位 
        long s5 = b[5] & 0xff; 
        long s6 = b[6] & 0xff; 
        long s7 = b[7] & 0xff; 
 
        // s0不变 
        s1 <<= 8; 
        s2 <<= 16; 
        s3 <<= 24; 
        s4 <<= 8 * 4; 
        s5 <<= 8 * 5; 
        s6 <<= 8 * 6; 
        s7 <<= 8 * 7; 
        s = s0 | s1 | s2 | s3 | s4 | s5 | s6 | s7; 
        return s; 
    } 
 
/** 
     * 注释：int到字节数组的转换！ 
     * 
     * @param number 
     * @return 
     */ 
    public static byte[] intToByte(int number) { 
        int temp = number; 
        byte[] b = new byte[4]; 
        for (int i = 0; i < b.length; i++) { 
            b[i] = new Integer(temp & 0xff).byteValue();// 
将最低位保存在最低位 
            temp = temp >> 8; // 向右移8位 
        } 
        return b; 
    } 
 
    /** 
     * 注释：字节数组到int的转换！ 
     * 
     * @param b 
     * @return 
     */ 
    public static int byteToInt(byte[] b) { 
        int s = 0; 
        int s0 = b[0] & 0xff;// 最低位 
        int s1 = b[1] & 0xff; 
        int s2 = b[2] & 0xff; 
        int s3 = b[3] & 0xff; 
        s3 <<= 24; 
        s2 <<= 16; 
        s1 <<= 8; 
        s = s0 | s1 | s2 | s3; 
        return s; 
    } 
 
    /** 
     * 注释：short到字节数组的转换！ 
     * 
     * @param s 
     * @return 
     */ 
    public static byte[] shortToByte(short number) { 
        int temp = number; 
        byte[] b = new byte[2]; 
        for (int i = 0; i < b.length; i++) { 
            b[i] = new Integer(temp & 0xff).byteValue();// 
将最低位保存在最低位 
            temp = temp >> 8; // 向右移8位 
        } 
        return b; 
    } 
 
    /** 
     * 注释：字节数组到short的转换！ 
     * 
     * @param b 
     * @return 
     */ 
    public static short byteToShort(byte[] b) { 
        short s = 0; 
        short s0 = (short) (b[0] & 0xff);// 最低位 
        short s1 = (short) (b[1] & 0xff); 
        s1 <<= 8; 
        s = (short) (s0 | s1); 
        return s; 
    }