Java中byte數(shù)組與long數(shù)組相互轉(zhuǎn)化

nacy2012 2015-11-10

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Java中byte數(shù)組與long數(shù)組相互轉(zhuǎn)化
ByteAndLongArrayTest代碼如下：

package com.array.test;
import java.io.IOException;
/**
 * @ version 1.0
 * @ author  wangwei
 * @ created on  2008-10-17
 */
public class ByteAndLongArrayTest {
    /**
     * long數(shù)組轉(zhuǎn)化為byte數(shù)組
     * 
     * @param longArray
     * @return
     * @throws IOException
     */
    public static byte[] longToByte(long[] longArray)throws IOException{
        byte[] byteArray=new byte[longArray.length*8];
        for(int i=0;i<longArray.length;i++)
        {
            byteArray[0+8*i]=(byte)(longArray[i]>>56);
            byteArray[1+8*i]=(byte)(longArray[i]>>48);
            byteArray[2+8*i]=(byte)(longArray[i]>>40);
            byteArray[3+8*i]=(byte)(longArray[i]>>32);
            byteArray[4+8*i]=(byte)(longArray[i]>>24);
            byteArray[5+8*i]=(byte)(longArray[i]>>16);
            byteArray[6+8*i]=(byte)(longArray[i]>>8);
            byteArray[7+8*i]=(byte)(longArray[i]>>0);
        }
        return byteArray;
    }
    
    /**
     * byte數(shù)組轉(zhuǎn)化為long數(shù)組
     * 
     * @param byteArray
     * @return
     * @throws IOException
     */
    public static long[] byteToLong(byte[] byteArray)throws IOException{
        
        long [] longArray=new long[byteArray.length/8];
        for(int i=0;i<longArray.length;i++)
        {
            longArray[i]=(((long)byteArray[0+8*i]&0xff)<<56)
                        |(((long)byteArray[1+8*i]&0xff)<<48)
                        |(((long)byteArray[2+8*i]&0xff)<<40)
                        |(((long)byteArray[3+8*i]&0xff)<<32)
                        |(((long)byteArray[4+8*i]&0xff)<<24)
                        |(((long)byteArray[5+8*i]&0xff)<<16)
                        |(((long)byteArray[6+8*i]&0xff)<<8)
                        |(((long)byteArray[7+8*i]&0xff)<<0);
            
        }
        return longArray;
    }
    /**
     * @param args
     */
    public static void main(String[] args) throws Exception{
        // TODO Auto-generated method stub
        long [] longArray={1,2,3,4,500000};
        byte [] byteArray=longToByte(longArray);
        for(int i=0;i<byteArray.length;i++)
        {
            System.out.print(byteArray[i]+" ");
        }
        System.out.println();
        long [] longArray2=byteToLong(byteArray);
        for(int i=0;i<longArray.length;i++)
            System.out.print(longArray[i]+" ");
    }
}