java中利用dom4j对XML文档的创建、解析、查找、修改、保存等操作

源：http://w11h22j33.iteye.com/blog/912166/
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java中利用dom4j对XML文档的创建、解析、查找、修改、保存等操作。

前两天,在java项目中写了一些关于对XML文档的操作,利用dom4j对XML文档的创建、解析、查找、修改、保存,校验等操作。以下代码供有需要的朋友参考。




import java.io.File;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Iterator;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;

import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.xml.sax.SAXException;
/***
* JDK版本：jdk5.0
* 利用dom4j对XML文档的创建、解析、查找、修改、保存等操作。
* @author Jack Chen
* 日期：2007-05-17
*/
public class TestXML {

public static final String SAVE_XMLFILE_PATH = "saveXML.xml";

public TestXML() {

}


/**
  * 创建一个XML文档
  * @return doc 返回该文档
  */
public Document createXMLDocument(){
  Document doc = null;
  doc = DocumentHelper.createDocument();
  doc.addComment("edited with XMLSpy v2005 rel. 3 U (http://www.altova.com) by  ()");
//  doc.addDocType("class","//By Jack Chen","saveXML.xsd");
  Element root = doc.addElement("class");
  Element company = root.addElement("company");
  Element person = company.addElement("person");
  person.addAttribute("id","11");
  person.addElement("name").setText("Jack Chen");
  person.addElement("sex").setText("男");
  person.addElement("date").setText("2001-04-01");
  person.addElement("email").setText("[email protected]");
  person.addElement("QQ").setText("2366001");

  return doc;
}

/**
  * 解析XML文档
  * @param xmlFile
  * @return XML文档
  * @throws DocumentException
  * @throws FileNotFoundException
  */
public Document parse(String xmlFile) throws DocumentException, FileNotFoundException{
  SAXReader reader = new SAXReader();
  Document doc = reader.read(new File(xmlFile));
  return doc;
}

/***
  * 将XML文档输出到控制台
  * @param doc
  * @throws IOException
  */
public void printDocument(Document doc) throws IOException{
  OutputFormat format = OutputFormat.createPrettyPrint();
  XMLWriter writer = new XMLWriter(new OutputStreamWriter(System.out),format);
  writer.write(doc);
  writer.close();
}

/**
  * 保存XML文档
  * @param doc
  * @throws IOException
  */
public void saveDocument(Document doc) throws IOException{
  OutputFormat format = OutputFormat.createPrettyPrint();
  XMLWriter writer = new XMLWriter(new FileOutputStream(SAVE_XMLFILE_PATH),format);
  writer.write(doc);
  writer.close();
}
/**
  * 验证XML文档和schemaURL
  * @param xmlFile
  * @param schemaUrl
  * @return XML文档
  * @throws SAXException
  * @throws DocumentException
  */
public Document validate(String xmlFile,String schemaUrl) throws SAXException, DocumentException{
  SAXReader reader = new SAXReader(true);
System.out.println("validate by: " + schemaUrl);
 
  reader.setFeature("http://apache.org/xml/features/validation/schema", true);
 
  reader.setFeature("http://xml.org/sax/features/validation", true);
 
  reader.setProperty("http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation",
    schemaUrl);
 
  reader.setFeature("http://apache.org/xml/features/validation/schema-full-checking",
                true);
  Document doc = reader.read(new File(xmlFile));
 
  return doc; 
}

/**
  * 查找 xml
  * @param doc
  * @throws IOException
  */

public void listDocument(Document doc) throws IOException{
 
  String xpath = "/class/company/person[@id="11"]";
  Element list =  (Element) doc.selectSingleNode(xpath);
  System.out.println(list.getName());

//  if (list.element("name").getName().equals("name")) {

  System.out.println("name:"+list.element("name").getText());
  System.out.println("sex:"+list.element("sex").getText());
  System.out.println("date:"+list.element("date").getText());
  System.out.println("email:"+list.element("email").getText());
  System.out.println("QQ:"+list.element("QQ").getText());
}

/***
  * 利用XPATH查找元素，然后修改
  * @param doc
  * @throws IOException
  */
public void updateDocByXPATH(Document doc) throws IOException{
  String xpath = "/class/company/person[@id="11"]";
  Element list =  (Element) doc.selectSingleNode(xpath);
  System.out.println(list.getName());

//  if (list.element("name").getName().equals("name")) {

  list.element("name").setText("1123");
  list.element("sex").setText("男");
  list.element("date").setText("1800-01-01");
  list.element("email").setText("[email protected]");
  list.element("QQ").setText("12345");
//  }
  saveDocument(doc);

}

/**
  * 从根节点遍历，来修改XML文件,并保存。
  * @param doc
  * @throws IOException
  */
public void updateDocument(Document doc) throws IOException{

  Element root = doc.getRootElement();
//  System.out.println(root.asXML());
 
  for (Iterator i = root.elementIterator(); i.hasNext();) {
   Element e = (Element) i.next();
   System.out.println(e.getName());
   System.out.println(e.getPath());
   if(e.element("person").element("name").getName().equals("name")){
    e.element("person").element("name").setText("ChenJI");
    e.element("person").element("QQ").setText("123456");

   }
   System.out.println(e.getText().toString());
  }
  saveDocument(doc); 
}

}