代码实现图片的复制
知识点：IO流

public void info() throws IOException {
        File file1 = new File("d:\\tmp", "copy.png");
        File file2 = new File("d:\\picture", "copy.png");
        FileInputStream fileInputStream = new FileInputStream(file1);
        FileOutputStream fileOutputStream = new FileOutputStream(file2,true);
        if (file1.exists()) {
            byte buf[] = new byte[8];
            int readLen = 0;
         while ((readLen = fileInputStream.read(buf)) != -1) {
                fileOutputStream.write(buf);
            }
            System.out.println("复制完毕");
        } else {
            System.out.println("文件不存在");
        }
    }