几个常见数据类型的转换

1 字符串转换成byte数组   
    public static void SaveStringsToBytes(byte[] byteBuf , String[] string){
        int arraylen = string.length;
        for(int i = 0 ; i < arraylen ; i++){
            byteBuf[i *DATA_LEN]= (byte)string[i].length();
            System.arraycopy(  string[i].getBytes() , 0 ,byteBuf , i * DATA_LEN + 1, string[i].length() );  
       }
    }
   
2 byte数组转换成字符串       
    public static void GetStringsFromBytes(byte[] byteBuf , String[] string)
    {
        byte[] strbytes = new byte[MAX_LEN];
        int len = 0;   
        for(int i = 0 ; i < MAX_NUM ; i++){    
            len = byteBuf[i * (DATA_LEN) ];
            System.arraycopy( byteBuf , i * (DATA_LEN) + 1 , strbytes , 0 , MAX_LEN);
            string[i] = new String(strbytes , 0 , len);
        }  
    }
3 整型转换成byte数组
    public static void SaveIntsToBytes(byte[] byteBuf , int[] intbuf){
        int arraylen = intbuf.length;
        for(int i = 0 ; i < arraylen ; i++)    {
            byte[] temp = new byte[4];
            temp[0] = (byte)(intbuf[i] & 0xFF);
            temp[1] = (byte)((intbuf[i] >> 8)& 0xFF);
            temp[2] = (byte)((intbuf[i] >> 16)& 0xFF);
            temp[3] = (byte)((intbuf[i] >> 24)& 0xFF);   
            System.arraycopy( temp , 0 , byteBuf , i * 4, 4);
        }
    }
4 byte数组转换成整型   
    public static void GetIntsFromBytes(byte[] byteBuf , int[] intbuf){
        byte[] temp = new byte[4]; 
        for(int i = 0 ; i < byteBuf.length/4 ; i++)    {      
            System.arraycopy(  byteBuf ,  i * 4 , temp , 0 , 4);
            intbuf[i] =(int)( (temp[0]&0xFF) + ((temp[1]<< 8)&0xFFFFFFFF ) +

            ((temp[2] <<16) &0xFFFFFFFF ) +((temp[3] << 24)   &0xFFFFFFFF ));
        }
    }

5 字节流转换成char

    public static void byteToChar(byte[] byteBuf , char[] charbuf,int length){ 

        for(int i = 0,j=0 ; i < length ; i+= 2,j++){  
            charbuf [j] = (char) ((char)byteBuf[i] | (char)(byteBuf[i+1])<<8);
         }         
     }

6. 从流到Java程序byte——〉char
7. 从Java程序到流char——〉byte

8. 从文件到Java程序 byte——〉char
9. 从Java程序到文件 char——〉byte