java的FileCopy

Java中的FileCopy可以使用Java IO中的InputStream和OutputStream来实现。具体实现方式如下：

public static void copyFile(File source, File dest) throws IOException {
    InputStream is = null;
    OutputStream os = null;
    try {
        is = new FileInputStream(source);
        os = new FileOutputStream(dest);
        byte[] buffer = new byte[1024];
        int length;
        while ((length = is.read(buffer)) > 0) {
            os.write(buffer, 0, length);
        }
    } finally {
        is.close();
        os.close();
    }
}

这段代码会将源文件复制到目标文件中。