public byte[] toByteArray() {
try {
ByteArrayOutputStream objectStream = dataObject.toByteArrayOutputStream();
DataOutputStream dout = new DataOutputStream(objectStream);
dout.writeUTF(recordid);
dout.close();
objectStream.close();
return objectStream.toByteArray();
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
上述代码存在问题。我首先创建一个objectStream(在另一个类中)。然后我手动将recordid添加到ByteArrayOutputStream。但有没有办法首先添加recordId &然后将ByteArrayOutputStream追加到它?基本上我有2个ByteArrayoutputStreams需要连接(并保持ByteArrayOutputStream)。Concatenate ByteArrayOutputStream
编辑: 我的新版本应该可以工作,但它不会。当我打印出dout的散列码时,在flush之前和之后都是一样的。这就像它保持空虚?那可能吗?
public byte[] toByteArray() {
try {
ByteArrayOutputStream realOutputStream = new ByteArrayOutputStream();
DataOutputStream dout = new DataOutputStream(realOutputStream);
dout.writeUTF(dataObject.getClass().toString());
dout.writeUTF(recordid);
System.out.println("Recordid: " + recordid + "|" + dout.hashCode());
dout.flush();
System.out.println("Recordid: " + recordid + "|" + dout.hashCode());
ByteArrayOutputStream objectStream = dataObject.toByteArrayOutputStream();
dout.write(objectStream.toByteArray());
dout.close();
objectStream.close();
return objectStream.toByteArray();
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
供您参考,API文档是JSR139:http://download.oracle。 com/javame/config/cldc/ref-impl/cldc1.1/jsr139/index.html – BalusC 2011-01-19 13:26:04