file文件与base64字符串的相互转换

今天心情不好，不想说话。

    /**
     * 文件转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, , 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字符串转文件
     * @param base64
     * @return
     */
    public static File base64ToFile(String base64) {
        File file = null;
        String fileName = "/Petssions/record/testFile.amr";
        FileOutputStream out = null;
        try {
            // 解码，然后将字节转换为文件
            file = new File(Environment.getExternalStorageDirectory(), fileName);
            if (!file.exists())
                file.createNewFile();
            byte[] bytes = Base64.decode(base64, Base64.DEFAULT);// 将字符串转换为byte数组
            ByteArrayInputStream in = new ByteArrayInputStream(bytes);
            byte[] buffer = new byte[];
            out = new FileOutputStream(file);
            int bytesum = ;
            int byteread = ;
            while ((byteread = in.read(buffer)) != -) {
                bytesum += byteread;
                out.write(buffer, , byteread); // 文件写操作
            }
        } catch (IOException ioe) {
            ioe.printStackTrace();
        } finally {
            try {
                if (out!= null) {
                    out.close();
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return file;
    }

因为楼下有教育我的朋友，刚好我又是个善良体贴的仙女，嗯，那把导入的类补充一下：

   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;