[转]java中long,int,short,String与byte数组之间的转换

//long类型转成byte数组 
  publicstaticbyte[] longToByte(long number){ 
        long temp = number; 
        byte[] b =newbyte[8]; 
        for(int i =0; i < b.length; i++){ 
            b[i]=newLong(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 
    publicstaticlong 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 
     */ 
    publicstaticbyte[] intToByte(int number){ 
        int temp = number; 
        byte[] b =newbyte[4]; 
        for(int i =0; i < b.length; i++){ 
            b[i]=newInteger(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 
     */ 
    publicstaticint 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 
     */ 
    publicstaticbyte[] shortToByte(short number){ 
        int temp = number; 
        byte[] b =newbyte[2]; 
        for(int i =0; i < b.length; i++){ 
            b[i]=newInteger(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 
     */ 
    publicstaticshort 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; 
    }

 

 

    /** 
     * 注释：字节数组到String的转换！ 
     * 
     * @param bytes 
     * @return 
     */ 
	public static String byteArrToString(byte[] bytes) {
		
		String strValue = "";
		for (int i = 0; i < bytes.length; i++) {
			strValue += Integer.toHexString(bytes[i] & 0xFF);
		}
		
		return strValue;
	}

 

 

来自：http://hi.baidu.com/menglinxi_a/blog/item/bbb061dcce494bb9cd11668b.html