防止包裝時非常印刷XML字符串

Question

我使用下面的代碼打印出更漂亮的XML字符串：

private String prettyFormat(String xml) throws TransformerException, ParserConfigurationException, IOException, InstantiationException, IllegalAccessException, ClassNotFoundException { 
    String formattedString = null; 
    try { 
     final InputSource src = new InputSource(new StringReader(xml)); 
     final Node document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(src).getDocumentElement(); 
     System.setProperty(DOMImplementationRegistry.PROPERTY,"com.sun.org.apache.xerces.internal.dom.DOMImplementationSourceImpl"); 
     final DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance(); 
     final DOMImplementationLS impl = (DOMImplementationLS) registry.getDOMImplementation("LS"); 
     final LSSerializer writer = impl.createLSSerializer(); 
     writer.getDomConfig().setParameter("format-pretty-print", Boolean.TRUE); 
     writer.getDomConfig().setParameter("xml-declaration", Boolean.FALSE); 
     formattedString = writer.writeToString(document); 

    } catch (Exception e) { 
     throw new RuntimeException(e); 
    } 
    return formattedString; 
} 

我的問題是，它包裹長的線，從而使這樣的：

<message code="272" coeMsgName="CCR_I-Credit-Control-Initial" endtoend="AUTO" error="false" hopbyhop="AUTO" proxiable="true" request="true" retransmit="false"> 

變成這樣：

<message code="272" coeMsgName="CCR_I-Credit-Control-Initial" 
    endtoend="AUTO" error="false" hopbyhop="AUTO" proxiable="true" 
    request="true" retransmit="false"> 

Answer 1

你不能。至少不使用LSSerializer時，因爲它使用的XMLSerializer是私有的，並且LSSerializer（及其實現DOMSerializerImpl）沒有任何設置OutputFormat屬性的方法。但是，您可以直接使用一個XmlSerializer：

private static String prettyFormat(String xml) throws TransformerException, ParserConfigurationException, IOException, InstantiationException, IllegalAccessException, ClassNotFoundException { 
    String formattedString = null; 
    try { 
     final InputSource src = new InputSource(new StringReader(xml)); 
     final Node document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(src).getDocumentElement(); 

     // the last parameter sets indenting/pretty-printing to true: 
     OutputFormat outputFormat = new OutputFormat("WHATEVER", "UTF-8", true); 
     // line width = 0 means no line wrapping: 
     outputFormat.setLineWidth(0); 
     StringWriter sw = new StringWriter(); 
     XML11Serializer writer = new XML11Serializer(sw, outputFormat); 
     writer.serialize((Element)document); 
     formattedString = sw.toString(); 

    } catch (Exception e) { 
     throw new RuntimeException(e); 
    } 
    return formattedString; 
} 

結果：

<message code="272" coeMsgName="CCR_I-Credit-Control-Initial" endtoend="AUTO" error="false" hopbyhop="AUTO" proxiable="true" request="true" retransmit="false"> 
    <test/> 
</message>