public class TestByte {public static void main(String[] args) throws IOException, InterruptedException {		File f = new File("C:\\Users\\Administrator\\Pictures\\测试1.jpg");FileInputStream is = new FileInputStream(f);FileOutputStream out = new FileOutputStream(new File("C:\\Users\\Administrator\\Pictures\\测试8.jpg"));int len = 0; String sj = "";//读取while((len=is.read())!=-1){  sj+=Integer.toBinaryString(len)+" ";}System.out.println(sj);//写入String[] arr = sj.split(" ");int m;for(String a:arr){m=Integer.parseInt(a,2);//竟然有这个方法？？？？？？我吐了。out.write(m);//所谓的输出流 就是write 一个  十进制的值  它所代表的就是 八位二进制 进而就是文件的一部分}}private static String[] binaryArray =   {"0000","0001","0010","0011",  "0100","0101","0110","0111",  "1000","1001","1010","1011",  "1100","1101","1110","1111"}; public static String bytes2BinaryStr(byte b){  String outStr = "";  int pos = 0;  //高四位  pos = (b&0xF0)>>4;  outStr+=binaryArray[pos];  //低四位  pos=b&0x0F;  outStr+=binaryArray[pos];  return outStr;  }  
}