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目标是读取 xml 文件并写入新的 xml 文件，同时保留换行符。我们需要 Document 对象来执行其他 xml 任务。

说 source.xml 看起来像这样：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
    <Code><![CDATA[code line1
code line 2
code line 3

code line 4]]></Code>

现在目标应该与代码元素中的换行符看起来相同。但相反，它忽略了换行符并将其变为一行。

对于写作，我使用以下方法：

public static void writeFile(Document xml, File writeTo)
    {
        try
        {
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); 
            DOMSource source = new DOMSource(xml);
            StreamResult result = new StreamResult(writeTo);
            transformer.transform(source, result);
        }
        catch(TransformerException e)
        {
            System.out.println("Couldn't write file " + writeTo);
            e.printStackTrace();
        }
    }

Document xml 是使用 DocumentBuilder 中的 Parse(File) 方法获得的。大致如下：

File file; // a list of files is recursively obtained from a given folder.

DocumentBuilderFactory documentBuilderfactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = documentBuilderfactory.newDocumentBuilder();
Document xml = builder.parse(file);

builder.parse 似乎正在丢失 Code 元素的 CDATA 中的换行符。

我们如何保留换行符？我是 Java API 的新手。

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1 回答 1

1

当我把你的片段放在一起时，我得到了这个程序：

public class TestNewLine {

    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException, TransformerException {
        DocumentBuilderFactory documentBuilderfactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = documentBuilderfactory.newDocumentBuilder();
        Document xml = builder.parse(TestNewLine.class.getResourceAsStream("data.xml"));
        TransformerFactory transformerFactory = TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        DOMSource source = new DOMSource(xml);
        StreamResult result = new StreamResult(System.out);
        transformer.transform(source, result);
    }
}

它打印出来：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<Code><![CDATA[code line1
code line 2
code line 3

code line 4]]></Code>

据我了解，换行符已被保留。你期望什么输出？

于 2015-01-13T10:07:54.747 回答