java整数与byte数组的转换实现代码

java整数与byte数组的转换实现代码

           这里对java中整数与byte数组的转换进行了实现，平时的项目中很少用的到，但是特定需求的时候还是需要的，这里就记录下，亲测可用，

实现代码：

public class NumberUtil { 
   
  public static byte[] intToByte4(int i) { 
    byte[] targets = new byte[4]; 
    targets[3] = (byte) (i & 0xFF); 
    targets[2] = (byte) (i >> 8 & 0xFF); 
    targets[1] = (byte) (i >> 16 & 0xFF); 
    targets[0] = (byte) (i >> 24 & 0xFF); 
    return targets; 
  } 
 
   
  public static byte[] longToByte8(long lo) { 
    byte[] targets = new byte[8]; 
    for (int i = 0; i < 8; i++) { 
      int offset = (targets.length - 1 - i) * 8; 
      targets[i] = (byte) ((lo >>> offset) & 0xFF); 
    } 
    return targets; 
  } 
 
   
  public static byte[] unsignedShortToByte2(int s) { 
    byte[] targets = new byte[2]; 
    targets[0] = (byte) (s >> 8 & 0xFF); 
    targets[1] = (byte) (s & 0xFF); 
    return targets; 
  } 
 
   
  public static int byte2ToUnsignedShort(byte[] bytes) { 
    return byte2ToUnsignedShort(bytes, 0); 
  } 
 
   
  public static int byte2ToUnsignedShort(byte[] bytes, int off) { 
    int high = bytes[off]; 
    int low = bytes[off + 1]; 
    return (high << 8 & 0xFF00) | (low & 0xFF); 
  } 
 
   
  public static int byte4ToInt(byte[] bytes, int off) { 
    int b0 = bytes[off] & 0xFF; 
    int b1 = bytes[off + 1] & 0xFF; 
    int b2 = bytes[off + 2] & 0xFF; 
    int b3 = bytes[off + 3] & 0xFF; 
    return (b0 << 24) | (b1 << 16) | (b2 << 8) | b3; 
  } 
} 

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