的java：写XML文件

Question

在java中我需要建立一个像这样的xml文件：

<?xml version="1.0" encoding="UTF-8"?> 
<NikuDataBus xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../xsd/nikuxog_customObjectInstance.xsd"> 
    <Header action="write" externalSource="NIKU" objectType="customObjectInstance" version="8.1.0.4247"/> 
    <customObjectInstances objectCode="hen_allockey_p"> 
     <instance instanceCode="MIG5033028" objectCode="hen_allockey_p" 
     parentInstanceCode="001260" parentObjectCode="project"> 
      <CustomInformation> 
       <ColumnValue name="hen_from">200801</ColumnValue> 
       <ColumnValue name="name">MIG5033028</ColumnValue> 
       <ColumnValue name="code">MIG5033028</ColumnValue> 
      <OBSAssocs/> 
      <Security/> 
     </instance> 
    </customObjectInstances> 
</NikuDataBus> 

我发现谷歌的东西，但它并没有匹配我的需求。而且，因为我是新的Java，我不知道如何适应我的需求。

谢谢你的帮助。

Answer 1

我是这样解决的。这是难看的代码，但它为我工作，也许有造成复制了一些错误并粘贴

public class POIExcelReader { 

private void setHenAllocKeyHeader(StringBuilder sb) { 
    sb.append ("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n" 
      + "<NikuDataBus xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:noNamespaceSchemaLocation=\"../xsd/nikuxog_customObjectInstance.xsd\">\r\n" 
      + "<Header action=\"write\" externalSource=\"NIKU\"objectType=\"customObjectInstance\" version=\"8.1.0.4247\"/>\r\n" 
      + "<customObjectInstances objectCode=\"hen_allockey_p\">\r\n" 
      + "<instance instanceCode=\"MIG5033028\" objectCode=\"hen_allockey_p\" parentInstanceCode=\"001260\" parentObjectCode=\"project\">\r\n"); 
} 

private void setHenAllocKeyBottom (StringBuilder sb) { 
    sb.append ("<OBSAssocs/>\r\n" 
      +"<Security/>\r\n" 
      +"</customObjectInstances>\r\n" 
      + "</NikuDataBus>\r\n"); 
} 

protected void jobRun() throws Exception { 

    StringBuilder sb = new StringBuilder(); 
    setHenAllocKeyHeader(sb); 
    String prolog = sb.toString(); 

    sb = new StringBuilder(); 
    setHenAllocKeyBottom(sb); 
    String epilog = sb.toString(); 


    FileOutputStream fos = new FileOutputStream("c:\\test\\osem.xml"); 
    OutputStreamWriter osw = new OutputStreamWriter(fos, Charset.forName("UTF-8")); 
    osw.write(prolog); 
    osw.write(epilog); 
    osw.flush(); 
    osw.close(); 

} 
public static void main(String[] args){ 
try{ 
      job.jobRun(); 
    } catch (Exception e) 
    { 
     System.out.println(""); 
    } 
} 

Answer 2

前段时间我有一个类似的问题，我使用的网站给了我很好的理解不同的编码方式。

This website为您提供许多不同的方式来编码XML：字符串，DOM，SAX

TransformerFactory transfac = TransformerFactory.newInstance(); 
     Transformer trans = transfac.newTransformer(); 
     //create string from xml tree 
     StringWriter sw = new StringWriter(); 
     StreamResult result = new StreamResult(sw); 
     DOMSource source = new DOMSource(doc); 
     trans.transform(source, result); 
     String xmlString = sw.toString(); 

     //Writing the string to a file 
     OutputStream outputStream; 
     byte buf[] = xmlString.getBytes(); 
     outputStream = new FileOutputStream(file); 
     for (byte element : buf) { 
      outputStream.write(element); 
     } 
     outputStream.close(); 
     buf = null; 

Answer 3

我建议你使用JAXB来代替。创建类NikuDataBus，Header，CustomInformation等。将它们标记为@XmlEntity。创建并填充对象。

NikyDataBus dataBus = new NikuDataBus(); 
dataBus.setHeader(....) 
//etc, etc.... 

File f = new File("mydata.xml"); 
Marshaller m = JAXBContext.newInstance(NikuDataBus.class, Header.class, CustomInformation.class).createMarshaller().marshal(dataBus, f) 

Answer 4

我对XStream有很好的体验。您只需制作对象并使用您想要的任何数据填充它们，最后您只需xstream.toXML(object);即可获取xml的字符串。

Answer 5

看起来您的XML基于XML Schema（../xsd/nikuxog_customObjectInstance.xsd）。如果是这种情况，您可以使用XML Beans。鉴于XML Schema，XML Beans将生成一组Java类（或一个jar文件），您可以使用它们以编程方式创建您的XML。

优点是您的XML符合您的XML架构。我发现这种方法在过去很有用，并且我对XML Beans有很好的经验。

Answer 6

您可以在GitHub上使用可用的Scilca XML进展包。

Node rootNode = Node.constructNode(<NikuDataBusxmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../xsd/nikuxog_customObjectInstance.xsd">"); 

rootNode.addChildNode(Node.constructNode("<Header action="write" externalSource="NIKU" objectType="customObjectInstance" version="8.1.0.4247"/>")); 

String customObj = "<customObjectInstances objectCode="hen_allockey_p">" 
         + "<instance instanceCode="MIG5033028" objectCode="hen_allockey_p" parentInstanceCode="001260" parentObjectCode="project">" 
         + "<CustomInformation>" 
           + "<ColumnValue name="hen_from">200801</ColumnValue>" 
           + "<ColumnValue name="name">MIG5033028</ColumnValue>" 
           + "<ColumnValue name="code">MIG5033028</ColumnValue>" 
         + "</CustomInformation>" 
         + "<OBSAssocs/><Security/>" 
         + "</instance>" 
         + "</customObjectInstances>" 

    // Now build to customObject element using a VirtualXML Iterator 

XMLIterator xi = new VirtualXML.XMLIterator(customObj); 
Node customO = Node.readFromFile(xi); 

rootNode.addChildNode(customO); 

Document XmlDocument = new Document(rootNode); 
XmlDocument.addXmlDeclaration(1.0, "UTF-8", null); 

XMLWriter xw = XmlDocument.getWriter(); 
xw.write("D:/file.txt");