java读取流关闭_使用java脚本io读取文件进行MD5加密后，文件流关闭不了

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File file &＃61; new File(fileDir);

String md5code &＃61; null;

FileInputStream in &＃61; null;

FileWriter writer &＃61; null;

try {

in &＃61; new FileInputStream(file);

MappedByteBuffer byteBuffer &＃61; in.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, file.length());

MessageDigest md5 &＃61; MessageDigest.getInstance("MD5");

md5.update(byteBuffer);

BigInteger bi &＃61; new BigInteger(1, md5.digest());

md5code &＃61; key &＃43; bi.toString(16);

writer &＃61; new FileWriter(Md5Dir);

writer.write(md5code);

writer.flush();

} catch (Exception e) {

e.printStackTrace();

} finally {

if (in !&＃61; null) {

try {

in.close();

} catch (IOException e) {

e.printStackTrace();

}

}

if(writer!&＃61;null){

try {

writer.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}