file文件與base64字符串的相互轉換

今天心情不好，不想說話。

    /**
     * 文件轉base64字符串
     * @param file
     * @return
     */
    public static String fileToBase64(File file) {
        String base64 = null;
        InputStream in = null;
        try {
            in = new FileInputStream(file);
            byte[] bytes = new byte[in.available()];
            int length = in.read(bytes);
            base64 = Base64.encodeToString(bytes, 0, length, Base64.DEFAULT);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return base64;
    }

    /**
     * base64字符串轉文件
     * @param base64
     * @return
     */
    public static File base64ToFile(String base64) {
        File file = null;
        String fileName = "/Petssions/record/testFile.amr";
        FileOutputStream out = null;
        try {
            // 解碼，然后將字節轉換為文件
            file = new File(Environment.getExternalStorageDirectory(), fileName);
            if (!file.exists())
                file.createNewFile();
            byte[] bytes = Base64.decode(base64, Base64.DEFAULT);// 將字符串轉換為byte數組
            ByteArrayInputStream in = new ByteArrayInputStream(bytes);
            byte[] buffer = new byte[1024];
            out = new FileOutputStream(file);
            int bytesum = 0;
            int byteread = 0;
            while ((byteread = in.read(buffer)) != -1) {
                bytesum += byteread;
                out.write(buffer, 0, byteread); // 文件寫操作
            }
        } catch (IOException ioe) {
            ioe.printStackTrace();
        } finally {
            try {
                if (out!= null) {
                    out.close();
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return file;
    }

 

 因為樓下有教育我的朋友，剛好我又是個善良體貼的仙女，嗯，那把導入的類補充一下：

   import android.os.Environment;
　　import android.util.Base64;
　　import java.io.ByteArrayInputStream;
　　import java.io.File;
　　import java.io.FileInputStream;
　　import java.io.FileNotFoundException;
　　import java.io.FileOutputStream;
　　import java.io.IOException;
　　import java.io.InputStream;