文本文件使用字符流来处理

非文本文件使用字节流来处理

字节流处理代码整理

  public void copyFile(String srcPath, String desPath) {
        FileInputStream fileInputStream = null;
        FileOutputStream fileOutputStream = null;
        try {
            File srcFile = new File(srcPath);
            File desFile = new File(desPath);

            fileInputStream = new FileInputStream(srcFile);
            fileOutputStream = new FileOutputStream(desFile);

            byte[] buffer = new byte[1024];

            int len;

            while ((len = fileInputStream.read(buffer)) != -1) {
                fileOutputStream.write(buffer, 0, len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fileInputStream != null) {
                try {
                    fileInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }

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


    }

使用缓冲流优化

    public void copyFileWithBuffered(String srcPath, String desPath) {
        FileInputStream fileInputStream = null;
        FileOutputStream fileOutputStream = null;
        BufferedInputStream bufferedInputStream = null;
        BufferedOutputStream bufferedOutputStream = null;
        try {
            File srcFile = new File(srcPath);
            File desFile = new File(desPath);

            fileInputStream = new FileInputStream(srcFile);
            fileOutputStream = new FileOutputStream(desFile);

            bufferedInputStream = new BufferedInputStream(fileInputStream);
            bufferedOutputStream = new BufferedOutputStream(fileOutputStream);


            byte[] buffer = new byte[1024];

            int len;

            while ((len = bufferedInputStream.read(buffer)) != -1) {
                bufferedOutputStream.write(buffer, 0, len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {

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

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

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