代码如下：
class CopyFile {
public static void FileCopy(String readfile, String writeFile) {
try {
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(readfile));
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(writeFile));
byte [] b = new byte[65535];
int bread ;
Long start = System.currentTimeMillis();
while ((bread = bis.read(b)) != -1) {
//System.out.println(bread);
bos.write(b);
//read1 = bis.read(b);
}
bos.flush();
bis.close();
bos.close();
System.out.println((System.currentTimeMillis() - start)+" milliseconds");
} catch (IOException e) {
System.out.println(e);
}
}

把那个65535改成1之后md5码不变了，但是速度慢了好多

把while中后面改为大于0 write后改为 b 0 bread

轻插楼上菊花

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