如何在 Java 中将 String 转换为 DOMSource？
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How can I convert a String to a DOMSource in Java?
提问by turlife
I need some help. In my Stringfiledata variable I stored an XMLdocument. Now I want to convert this variable to a DOMSourcetype and use this code:
我需要一些帮助。在我的String文件数据变量中，我存储了一个 XML 文档。现在我想将此变量转换为DOMSource类型并使用以下代码：
DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = db.parse( new InputSource( new StringReader( filedata ) ) );
DOMSource source = new DOMSource(doc);
and transform by javax.xml.transform.Transformer :
并通过 javax.xml.transform.Transformer 进行转换：
Transformer transformer = XMLTransformerFactory.getTransformer(messageType);
StreamResult res = new StreamResult(flatXML);
transformer.transform(source, res);
But my flatXML is empty after transformation. I checked my doc variable, and it contains my XML document and parsed everything right. If I change my source to the real path everything is ok and works fine :
但是转换后我的 flatXML 是空的。我检查了我的 doc 变量，它包含我的 XML 文档并正确解析了所有内容。如果我将源更改为真实路径，则一切正常并且工作正常：
Source source = new StreamSource("c:\temp\log\SMKFFcompleteProductionPlan.xml");
I think my problem situated in this line of code :
我认为我的问题位于这行代码中：
DOMSource source = new DOMSource(doc);
but I don't know how to solve this problem.
但我不知道如何解决这个问题。
回答by Michael Kay
Why are you trying to construct a DOMSource? If all you want is a source to supply as input to a transformation, it is much more efficient to supply a StreamSource, which you can do as
你为什么要构建一个 DOMSource？如果您想要的只是一个源作为转换的输入提供，则提供 StreamSource 效率更高，您可以这样做
new StreamSource(new StringReader(fileData))
preferably supplying a systemId as well. Constructing the DOM is a waste of time.
最好也提供一个 systemId。构建 DOM 是浪费时间。
回答by Shreyos Adikari
FYI:There are no constructor of Class DOMSource having argument only String like DOMSource(String).
The constructors are as follows:
i)DOMSource()
ii)DOMSource(Node n)
iii)DOMSource(Node node, String systemID)
Please see : http://docs.oracle.com/javase/6/docs/api/javax/xml/transform/dom/DOMSource.html
仅供参考：没有像 DOMSource(String) 这样只有 String 参数的 DOMSource 类的构造函数。
构造函数如下：
i) DOMSource()
ii) DOMSource(Node n)
iii)DOMSource(Node node, String systemID)
请参见：http: //docs.oracle.com/javase/6/docs/api/javax/xml/transform/dom/DOMSource.html
