java int类型转byte数组

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这里只写了几个 转换程序     主要是java和其他语言交互时的大小端问题    

//高前低后

	public static byte[] intToByteArray( int integer) {

		int byteNum = (40 -Integer.numberOfLeadingZeros (integer < 0 ? ~integer : integer))/ 8;
		byte[] byteArray = new byte[4];

		for (int n = 0; n < byteNum; n++)
		byteArray[3 - n] = (byte) (integer>>> (n * 8));

		return byteArray;
		}
	/**
	 * 将int转为低字节在前，高字节在后的byte数组
	 */
	public static byte[] tolh(int n) {
		byte[] b = new byte[4];
		b[0] = (byte) (n & 0xff);
		b[1] = (byte) (n >> 8 & 0xff);
		b[2] = (byte) (n >> 16 & 0xff);
		b[3] = (byte) (n >> 24 & 0xff);
		return b;
	}
	/**  
	  * 将int转为高字节在前，低字节在后的byte数组  
	  * @param n int  
	  * @return byte[]  
	  */  
	public static byte[] toHH(int n) {  
	  byte[] b = new byte[4];  
	  b[3] = (byte) (n & 0xff);  
	  b[2] = (byte) (n >> 8 & 0xff);  
	  b[1] = (byte) (n >> 16 & 0xff);  
	  b[0] = (byte) (n >> 24 & 0xff);  
	  return b;  
	}   
	/**
	 * 将byte数组转化成String
	 */
	public static String toStr(byte[] valArr,int maxLen) {
		int index = 0;
		while(index < valArr.length && index < maxLen) {
			if(valArr[index] == 0) {
				break;
			}
			index++;
		}
		byte[] temp = new byte[index];
		System.arraycopy(valArr, 0, temp, 0, index);
		return new String(temp);
	}
	
	/**
	 * 将低字节在前转为int，高字节在后的byte数组
	 */
	public static int vtolh(byte[] bArr) {
		int n = 0;
		for(int i=0;i<bArr.length&&i<4;i++){
			int left = i*8;
			n+= (bArr[i] << left);
		}
		return n;
	}
	

	//高前低后
	public static int bytesToInt2(byte[] src, int offset) {  
	    int value;    
	    value = (int) ( ((src[offset] & 0xFF)<<24)  
	            |((src[offset+1] & 0xFF)<<16)  
	            |((src[offset+2] & 0xFF)<<8)  
	            |(src[offset+3] & 0xFF));  
	    return value;  
	}  

全部转换可参考 ：http://blog.csdn.net/u011068702/article/details/51857557