四、练习文件拷贝——利用文件流实现文件的复制

import java.io.*;

public class FileCopy {
    public static void main(String[] args) {
        Copy("女子.jpg", "漂亮.jpg");
    }
    public static void Copy(String srcPath, String destPath) {
        //1、创建源
        File src = new File(srcPath);  //源头
        File dest = new File(destPath); //目的地
        //2、选择流
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            inputStream = new FileInputStream(src);
            outputStream = new FileOutputStream(dest);
            //3、操作流（分段读取）
            byte[] flush = new byte[1024]; //缓冲容器
            int len = -1;//接收长度
            while ((len = inputStream.read(flush)) != -1) {
                outputStream.write(flush, 0, len);
            }
            outputStream.flush();//刷新此输出流并强制任何缓冲的输出字节被写出,细节
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //4、释放资源，分别关闭，先打开的后关闭， 好处：只要保证我的目的地正确就可以
            try {
                if (outputStream != null) {
                    outputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

            try {
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}