File与byte[]转换

File转换为byte[],下面是给出File的路径参数:

    public static byte[] getBytesByFile(String filePath) {
        try {
            File file=new File(filePath);
            //获取输入流
            FileInputStream fis = new FileInputStream(file);

            //新的 byte 数组输出流,缓冲区容量1024byte
            ByteArrayOutputStream bos = new ByteArrayOutputStream(1024);
            //缓存
            byte[] b = new byte[1024];
            int n;
            while ((n = fis.read(b)) != -1) {
                bos.write(b, 0, n);
            }
            fis.close();
            //改变为byte[]
            byte[] data = bos.toByteArray();
            //
            bos.close();
            return data;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

byte[]转换为File,输入参数:文件byte[],文件转换后的路径(不含文件名.格式),文件名称(包括格式)

public static void getFileByBytes(byte[] bytes, String filePath, String fileName) {
        BufferedOutputStream bos = null;
        FileOutputStream fos = null;
        File file = null;
        try {
            File dir = new File(filePath);
            // 判断文件目录是否存在
            if (!dir.exists() && dir.isDirectory()) {
                dir.mkdirs();
            }
            file = new File(filePath + "\\" + fileName);

            //输出流
            fos = new FileOutputStream(file);

            //缓冲流
            bos = new BufferedOutputStream(fos);

            //将字节数组写出
            bos.write(bytes);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (bos != null) {
                try {
                    bos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

 

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