Java解析XML

骑猪看日落 2022-06-10 08:57 230阅读 0赞

import java.io.File;  
import java.lang.reflect.Field;  
import java.lang.reflect.InvocationTargetException;  
import java.lang.reflect.Method;  
import java.util.Iterator;

import org.dom4j.Document;  
import org.dom4j.DocumentException;  
import org.dom4j.Element;  
import org.dom4j.io.SAXReader;

public class ParserXML \{  
 public static final String xmlPath = "D:/JAVA\_HOME/pom.xml";

@SuppressWarnings("unchecked")  
 public static SimplePom parseXmlToSimplePOM() \{  
  File xmlFile = new File(xmlPath);  
  SAXReader reader = new SAXReader();  
  SimplePom simplePom = null;  
  try \{  
   Document document = reader.read(xmlFile);  
   Element root = document.getRootElement();  
   simplePom = SimplePom.class.newInstance();  
   Field\[\] fields = SimplePom.class.getFields();  
   for (int i = 0; i < fields.length; i++) \{  
    if (fields\[i\].getType().getSimpleName().equals("String")) \{  
     Element element = root.element(fields\[i\].getName());  
     if (element != null) \{  
      fields\[i\].set(simplePom, element.getTextTrim());  
     \}  
    \}  
   \}  
   fields = null;

Iterator<Element> iterator = root.element("dependencies").elementIterator("dependency");  
   while (iterator.hasNext()) \{  
    Element edependency = iterator.next();  
    Dependency dependency = Dependency.class.newInstance();  
    fields = Dependency.class.getFields();  
    for (int i = 0; i < fields.length; i++) \{  
     Element element = edependency.element(fields\[i\].getName());  
     if (element != null) \{  
      fields\[i\].set(dependency, element.getTextTrim());  
     \}  
    \}  
    Method method = SimplePom.class.getMethod("addDependency",Dependency.class);  
    method.invoke(simplePom, dependency);  
   \}  
  \} catch (DocumentException e) \{  
   e.printStackTrace();  
  \} catch (InstantiationException e) \{  
   e.printStackTrace();  
  \} catch (IllegalAccessException e) \{  
   e.printStackTrace();  
  \} catch (SecurityException e) \{  
   e.printStackTrace();  
  \} catch (NoSuchMethodException e) \{  
   e.printStackTrace();  
  \} catch (IllegalArgumentException e) \{  
   e.printStackTrace();  
  \} catch (InvocationTargetException e) \{  
   e.printStackTrace();  
  \}  
  return simplePom;  
 \}

public static void parseXmlToMap() \{  
  File xmlFile = new File(xmlPath);  
  SAXReader reader = new SAXReader();  
  try \{  
   Document document = reader.read(xmlFile);  
   Element root = document.getRootElement();  
   Element version = root.element("version");  
   System.out.println("groupId:" + root.element("groupId").getText());  
   System.out.println("artifactId:"+ root.element("artifactId").getText());  
   System.out.println("packaging:" + root.element("packaging").getText());  
   System.out.println("version:" + root.element("version").getText());  
   System.out.println("name:" + root.element("name").getText());  
   System.out.println("url:" + root.element("url").getText());

Iterator<Element> iterator = root.element("dependencies")  
     .elementIterator("dependency");  
   while (iterator.hasNext()) \{  
    Element edependency = iterator.next();  
    Iterator iterInner = edependency.elementIterator();  
    while (iterInner.hasNext()) \{  
     Element elementInner = (Element) iterInner.next();  
     if (elementInner.getName().equals("version")) \{  
      String vsDpendency = elementInner.getText();  
      if ("$\{project.version\}".equals(vsDpendency)) \{  
       vsDpendency = version.getText();  
      \}  
      System.out  
        .println("dependency->version=" + vsDpendency);  
     \}  
    \}  
   \}  
  \} catch (DocumentException e) \{  
   e.printStackTrace();  
  \}  
 \}

public static void main(String arge\[\]) \{  
  System.out.println(parseXmlToSimplePOM().dependencys.size());  
  parseXmlToMap();  
 \}  
\}

\----------------------使用返回Entity对象的话，需要增加两个Entity-----------------

public class Dependency \{  
 public String groupId;  
 public String artifactId;  
 public String version;  
\}

public class SimplePom \{  
 public String modelVersion;  
 public String groupId;  
 public String artifactId;  
 public String packaging;  
 public String version;  
 public String name;  
 public String url;  
 public List<Dependency> dependencys = new ArrayList<Dependency>();

public void addDependency(Dependency dependency) \{  
  dependencys.add(dependency);  
 \}

/\*\*  
  \* 获取基本的版本号(去掉快照标示)  
  \*  
  \* @return  
  \*/  
 public String getSimpleVersion() \{  
  if (version != null && version.indexOf("") > 0) \{  
   return version.replace("-SNAPSHOT", "");  
  \}  
  return version;  
 \}  
\}

\# 使用DOM 解析XML

import java.io.File;
    import javax.xml.parsers.DocumentBuilder;
    import javax.xml.parsers.DocumentBuilderFactory;
    import org.w3c.dom.Document;
    import org.w3c.dom.NodeList;
    
    /**
     * 使用DOM技术解析XML
     * 
     * @author kevin Luan
     * 
     */
    public class ParserXML {
    	public static final String FILENAME = "D:\\Software\\TestNamespace\\DataExtraction\\NewFile.xml";
    
    	public static void main(String arge[]) {
    		ParserXML xml = new ParserXML();
    		xml.run();
    	}
    
    	public void run() {
    		try {
    			File f = new File("NewFile.xml");
    			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    			DocumentBuilder builder = factory.newDocumentBuilder();
    			Document doc = builder.parse(f);
    			NodeList nl = doc.getElementsByTagName("user");
    			for (int i = 0; i < nl.getLength(); i++) {
    				System.out.println("姓名:" + doc.getElementsByTagName("name").item(i).getFirstChild().getNodeValue());
    				System.out.println("年龄:" + doc.getElementsByTagName("age").item(i).getFirstChild().getNodeValue());
    			}
    		} catch (Exception e) {
    			e.printStackTrace();
    
    		}
    	}
    }