在java中关闭流时，你并没有明确定义流变量？ [英] Closing streams in java when you don't explicitly define the stream variable?

问题描述

所以我在Java中不知道是这安全吗？

So I'm wondering in Java is this safe?

HttpClient client = new DefaultHttpClient();
HttpResponse response = client.execute(new HttpGet(new URI(String)));
XmlPullParser xpp = Util.getXpp(new InputStreamReader(response.getEntity().getContent()));

我没有明确定义，这意味着有没有办法对我来说，关闭它的InputStreamReader。我并不特别喜欢这个code的外观，虽然。这样一来，我做的原因是因为我不希望有等待关闭流，直到我做了解析XML了。

I'm not explicitly defining the InputStreamReader which means there's no way for me to close it. I don't particularly like the look of this code, though. The reason I'm doing it this way is because I don't want to have to wait to close the stream until after I'm done the parsing the XML.

请问VM自动关闭该流一旦code是超出范围？我应该修改我的code，所以我可以明确地关闭该流一旦我做了解析XML？

Will the VM automatically close the stream once the code is out of scope? Should I refactor my code so I can explicitly close the stream once I'm done parsing the XML?

推荐答案

您需要关闭它。理想情况下，会有一个try /终于结构，这样即使有异常数据流被关闭。 （或者使用新的Java 7的try-与资源的东西）

You need to close it. Ideally, there would be a try / finally structure so that even if there is an Exception the stream gets closed. (Or use new Java 7 try-with-resources stuff)

InputStreamReader reader = null;
try {
   all the stuff that might fail (IOException etc...)
}
finally {
  if (reader != null)
    try {
       reader.close();
    }
    catch (IOExcetpion ioe) {
       ; // this is one of the very few cases it's best to ignore the exception
    }
}

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