验证 List(Jaxb) 中未编组的条目 [英] Verifying unmarshalled entries from List( Jaxb)

问题描述

我有 4 个 XML 文件，其结构如下:

I have a 4 XML files having a structure as follows:

<?xml version="1.0"?>
<Registry>
    <Insitutions>
        <Insitiution>
            <name>A</name>
            <location>B</location>
        </Insitiution>
        <Insitiution>
            <name>C</name>
            <location>D</location>
        </Insitiution>
        <Insitiution>
            <name>E</name>
            <location>F</location>
        </Insitiution>
    </Insitutions>
</Registry>

我已经为各个 XML 标记编写了类，并使用 jaxb 对它们进行了解组.我解组所有文件并将所有条目存储在列表中，如下所示:

I have written the classes for individual XML tags, and have unmarshalled them using jaxb. I unmarshall all the files and store all the entries in a list as follows:

  private static List<String> loadBaseNodesets() throws JAXBException {
        log.info("Loading nodesets");
        Registry xmlentries = null;
        JAXBContext jaxbContext = null;
        List<Registry> entries = new ArrayList<>();
        List<String> privateBaseNodeSets= new ArrayList<>();
        File dir = new File("XMLFiles");
        if (dir.exists() && dir.isDirectory()) {
            FileFilter filter = new FileFilter() {
                public boolean accept(File file) {
                    return file.isFile() && file.getName().endsWith(".xml");
                }
            };
        log.info("iterating through all files");
        File [] files = dir.listFiles(filter);
        if (files != null) {                    
                for (int i =0;i <1;i++) {   
                    jaxbContext = JAXBContext.newInstance(Registry.class);
                    Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
                    xmlentries = (Registry) jaxbUnmarshaller.unmarshal(files[i]);
                    privateBaseNodeSets.add(xmlentries.toString());
                    log.info(files[i].getName()+" NodeSet loaded");
                    entries.add(xmlentries);            
                }
            }
        
        }       
        log.info("Nodeset loading complete");
    return privateBaseNodeSets;
  }

我需要将所有 xmlentries 放入一个字符串列表中.

I need to put all the xmlentries to a list of string.

现在从主程序中，我想检查是否可以获得相同格式的 XML 条目.

Now from the main program, I would like to check if I can get the same format of the XML entries.

 public static void main(String[] args) throws JAXBException {
    log.info("Started local test main");
    List<String> baseNodesets = loadBaseNodesets();
    ListIterator<String> litr = baseNodesets.listIterator();
    while (litr.hasNext()) {
        
        JAXBContext jaxbContext=JAXBContext.newInstance(Registry.class);
        Marshaller marshaller = jaxbContext.createMarshaller();#
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(, System.out);// DONT KNOW THE FIRST PARAMETER
        }

我无法在此处获取第一个参数.有人可以帮忙吗?

I am not able to get the first parameter here. Could anyone please help?

推荐答案

我不确定我是否正确理解了你的问题，但我猜你正在尝试做这样的事情:

I am not sure if I understood your question correctly but I am guessing you are trying to do something like this:

1. 逐个读取每个文件并解组并存储在entries列表中.
2. 然后遍历 entries List 并将它们一一编组.
3. 将转换后的 XML 存储到 List 中

1. Read each file one by one and unmarshal and store in entries List.
2. Then loop over the entries List and marshal them one by one.
3. Store the converted XML into List

我在一个文件夹中存储了 2 个相同的 XML 文件并试图读取它

I stored 2 same XML files in a folder and tried to read it

XML 文件:

<?xml version="1.0"?>
<Registry>
    <Insitutions>
        <Insitiution>
            <name>A</name>
            <location>B</location>
        </Insitiution>
        <Insitiution>
            <name>C</name>
            <location>D</location>
        </Insitiution>
        <Insitiution>
            <name>E</name>
            <location>F</location>
        </Insitiution>
    </Insitutions>
</Registry>

根:

@Data
@XmlRootElement(name = "Registry")
@XmlAccessorType(XmlAccessType.FIELD)
public class Root {
    @XmlElementWrapper(name = "Insitutions")
    @XmlElement(name = "Insitiution")
    private List<Insitiution> Insitiution;
}

机构:

@Data
@XmlAccessorType(XmlAccessType.FIELD)
public class Insitiution {
    private String name;
    private String location;
}

编组(主要):

public class Marshalling {

    public static void main(String[] args) throws JAXBException, XMLStreamException, FactoryConfigurationError, IOException, SAXException {
        final File dir = new File("/Users/Downloads/test");
        final List<Root> entries = new ArrayList<>();
        final Unmarshaller unmarshaller = JAXBContext.newInstance(com.newJAXB.Root.class).createUnmarshaller();
        final StringWriter singleXmlEvent = new StringWriter();
        final List<String> xmlOutput = new ArrayList<>();
        final Marshaller marshaller = JAXBContext.newInstance(Root.class).createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

        for (File file : dir.listFiles()) {
            if (!file.isDirectory() && file.getName().endsWith(".xml")) {
                //Storing all the files into entries List
                final DataInputStream inputStream = new DataInputStream(new FileInputStream(file.getAbsolutePath()));
                final XMLStreamReader xmlStreamReader = XMLInputFactory.newInstance().createXMLStreamReader(inputStream);
                final com.newJAXB.Root root = unmarshaller.unmarshal(xmlStreamReader, com.newJAXB.Root.class).getValue();
                entries.add(root);
                System.out.println(root.toString());
            }
        }

        //Loop through each entry in entries and marshal it
        for (Root item : entries) {
            marshaller.marshal(item, singleXmlEvent);
            xmlOutput.add(singleXmlEvent.toString());
            // Clear the StringWriter for next event
            singleXmlEvent.getBuffer().setLength(0);
        }

        //Final all the XML
        System.out.println(xmlOutput);
    }
}

输出:

Root(Insitiution=[Insitiution(name=A, location=B), Insitiution(name=C, location=D), Insitiution(name=E, location=F)])
Root(Insitiution=[Insitiution(name=A, location=B), Insitiution(name=C, location=D), Insitiution(name=E, location=F)])
[<?xml version="1.0" encoding="UTF-8"?>
<Registry>
   <Insitutions>
      <Insitiution>
         <name>A</name>
         <location>B</location>
      </Insitiution>
      <Insitiution>
         <name>C</name>
         <location>D</location>
      </Insitiution>
      <Insitiution>
         <name>E</name>
         <location>F</location>
      </Insitiution>
   </Insitutions>
</Registry>
, <?xml version="1.0" encoding="UTF-8"?>
<Registry>
   <Insitutions>
      <Insitiution>
         <name>A</name>
         <location>B</location>
      </Insitiution>
      <Insitiution>
         <name>C</name>
         <location>D</location>
      </Insitiution>
      <Insitiution>
         <name>E</name>
         <location>F</location>
      </Insitiution>
   </Insitutions>
</Registry>
]

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