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Java&Xml教程（七）运用JDOM修正XML文件内容【XML教程】,Java，Xml，JDOM

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JDOM供应了异常天真的体式格局操纵XML文件，运用JDOM异常简朴而且代码简约可读性强。前面我们进修了怎样运用JDOM剖析XML文件，本节引见怎样运用JDOM修正XML文件内容。

在这个教程中，我们预备对下面的XML文件举行修正：
employees.xml

<?xml version="1.0" encoding="UTF-8"?><Employees xmlns="http://www.journaldev.com/employees">
  <Employee id="1">
    <age>25</age>
    <name>Pankaj</name>
    <gender>Male</gender>
    <role>Java Developer</role>
  </Employee>
  <Employee id="2">
    <age>34</age>
    <name>Mona</name>
    <gender>Female</gender>
    <role>Manager</role>
  </Employee>
  <Employee id="3">
    <age>45</age>
    <name>Dave</name>
    <gender>Male</gender>
    <role>Support</role>
  </Employee></Employees>

我们将转变xml中每一个Employee元素：
1.修正一切name元素，使它的内容悉数变成大写。
2.在gender（性别）为Male（男）的id属性值后追加M，gender（性别）为Female（女） 的id属性值后追加F。
3.删除gender元素。
4.为每一个Employee元素增添salary（薪水）子元素，默认值为1000。
下面是顺序代码：
JDOMXMLEditor.java

package com.journaldev.xml.jdom;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import org.jdom2.Element;
import org.jdom2.JDOMException;
import org.jdom2.Namespace;
import org.jdom2.input.SAXBuilder;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;
public class JDOMXMLEditor {

    public static void main(String[] args) throws JDOMException, IOException {        
    final Namespace ns = Namespace.getNamespace("http://www.journaldev.com/employees");        
    //Get the JDOM document
        org.jdom2.Document doc = useSAXParser("employees.xml");        
        //Get list of Employee element
        Element rootElement = doc.getRootElement();
        List<Element> listEmpElement = rootElement.getChildren("Employee", ns);        
        //loop through to edit every Employee element
        for (Element empElement : listEmpElement) {            
        //change the name to BLOCK letters
            String name = empElement.getChildText("name", ns);            
            if (name != null)
                empElement.getChild("name", ns).setText(name.toUpperCase());            
                //edit the ID attribute based on Gender
            String gender = empElement.getChildText("gender", ns);            
            if (gender != null && gender.equalsIgnoreCase("female")) {
                String id = empElement.getAttributeValue("id");
                empElement.getAttribute("id").setValue(id + "F");
            } else {
                String id = empElement.getAttributeValue("id");
                empElement.getAttribute("id").setValue(id + "M");
            }            
            //remove gender element as it's not needed anymore
            empElement.removeChild("gender", ns);            
            //add salary element with default value to every employee
            empElement.addContent(new Element("salary", ns).setText("1000"));
        }        
        //document is processed and edited successfully, lets save it in new file
        XMLOutputter xmlOutputter = new XMLOutputter(Format.getPrettyFormat());        
        //output xml to console for debugging
        //xmlOutputter.output(doc, System.out);
        xmlOutputter.output(doc, new FileOutputStream("employees_new.xml"));
    }    //Get JDOM document from SAX Parser
    private static org.jdom2.Document useSAXParser(String fileName) throws JDOMException,
            IOException {
        SAXBuilder saxBuilder = new SAXBuilder();        
        return saxBuilder.build(new File(fileName));
    }

}

须要注重的是上面代码运用定名空间猎取一切元素，运转顺序输出XML文件内容：
employees_new.xml

<?xml version="1.0" encoding="UTF-8"?><Employees xmlns="http://www.journaldev.com/employees">
  <Employee id="1M">
    <age>25</age>
    <name>PANKAJ</name>
    <role>Java Developer</role>
    <salary>1000</salary>
  </Employee>
  <Employee id="2F">
    <age>34</age>
    <name>MONA</name>
    <role>Manager</role>
    <salary>1000</salary>
  </Employee>
  <Employee id="3M">
    <age>45</age>
    <name>DAVE</name>
    <role>Support</role>
    <salary>1000</salary>
  </Employee></Employees>

JDOM供应了异常天真的体式格局操纵XML文件，运用JDOM异常简朴而且代码简约可读性强。前面我们进修了怎样运用JDOM剖析XML文件，本节引见怎样运用JDOM修正XML文件内容。
在这个教程中，我们预备对下面的XML文件举行修正：
employees.xml

<?xml version="1.0" encoding="UTF-8"?><Employees xmlns="http://www.journaldev.com/employees">
  <Employee id="1">
    <age>25</age>
    <name>Pankaj</name>
    <gender>Male</gender>
    <role>Java Developer</role>
  </Employee>
  <Employee id="2">
    <age>34</age>
    <name>Mona</name>
    <gender>Female</gender>
    <role>Manager</role>
  </Employee>
  <Employee id="3">
    <age>45</age>
    <name>Dave</name>
    <gender>Male</gender>
    <role>Support</role>
  </Employee></Employees>

我们将转变xml中每一个Employee元素：
1.修正一切name元素，使它的内容悉数变成大写。
2.在gender（性别）为Male（男）的id属性值后追加M，gender（性别）为Female（女） 的id属性值后追加F。
3.删除gender元素。
4.为每一个Employee元素增添salary（薪水）子元素，默认值为1000。
下面是顺序代码：
JDOMXMLEditor.java

package com.journaldev.xml.jdom;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import org.jdom2.Element;
import org.jdom2.JDOMException;
import org.jdom2.Namespace;
import org.jdom2.input.SAXBuilder;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;
public class JDOMXMLEditor {

    public static void main(String[] args) throws JDOMException, IOException {        
    final Namespace ns = Namespace.getNamespace("http://www.journaldev.com/employees");        
    //Get the JDOM document
        org.jdom2.Document doc = useSAXParser("employees.xml");        
        //Get list of Employee element
        Element rootElement = doc.getRootElement();
        List<Element> listEmpElement = rootElement.getChildren("Employee", ns);        
        //loop through to edit every Employee element
        for (Element empElement : listEmpElement) {            
        //change the name to BLOCK letters
            String name = empElement.getChildText("name", ns);            
            if (name != null)
                empElement.getChild("name", ns).setText(name.toUpperCase());            
                //edit the ID attribute based on Gender
            String gender = empElement.getChildText("gender", ns);            
            if (gender != null && gender.equalsIgnoreCase("female")) {
                String id = empElement.getAttributeValue("id");
                empElement.getAttribute("id").setValue(id + "F");
            } else {
                String id = empElement.getAttributeValue("id");
                empElement.getAttribute("id").setValue(id + "M");
            }            
            //remove gender element as it's not needed anymore
            empElement.removeChild("gender", ns);            
            //add salary element with default value to every employee
            empElement.addContent(new Element("salary", ns).setText("1000"));
        }        //document is processed and edited successfully, lets save it in new file
        XMLOutputter xmlOutputter = new XMLOutputter(Format.getPrettyFormat());        
        //output xml to console for debugging
        //xmlOutputter.output(doc, System.out);
        xmlOutputter.output(doc, new FileOutputStream("employees_new.xml"));
    }    //Get JDOM document from SAX Parser
    private static org.jdom2.Document useSAXParser(String fileName) throws JDOMException,
            IOException {
        SAXBuilder saxBuilder = new SAXBuilder();        
        return saxBuilder.build(new File(fileName));
    }

}

须要注重的是上面代码运用定名空间猎取一切元素，运转顺序输出XML文件内容：
employees_new.xml

<?xml version="1.0" encoding="UTF-8"?><Employees xmlns="http://www.journaldev.com/employees">
  <Employee id="1M">
    <age>25</age>
    <name>PANKAJ</name>
    <role>Java Developer</role>
    <salary>1000</salary>
  </Employee>
  <Employee id="2F">
    <age>34</age>
    <name>MONA</name>
    <role>Manager</role>
    <salary>1000</salary>
  </Employee>
  <Employee id="3M">
    <age>45</age>
    <name>DAVE</name>
    <role>Support</role>
    <salary>1000</salary>
  </Employee></Employees>

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