Java - Reading XML file

One of the possible implementations:

File file = new File("userdata.xml");DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory        .newInstance();DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();Document document = documentBuilder.parse(file);String usr = document.getElementsByTagName("user").item(0).getTextContent();String pwd = document.getElementsByTagName("password").item(0).getTextContent();

when used with the XML content:

<credentials>    <user>testusr</user>    <password>testpwd</password></credentials>

results in "testusr" and "testpwd" getting assigned to the usr and pwd references above.

Reading xml the easy way:

http://www.mkyong.com/java/jaxb-hello-world-example/

package com.mkyong.core;import javax.xml.bind.annotation.XmlAttribute;import javax.xml.bind.annotation.XmlElement;import javax.xml.bind.annotation.XmlRootElement;@XmlRootElementpublic class Customer {    String name;    int age;    int id;    public String getName() {        return name;    }    @XmlElement    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    @XmlElement    public void setAge(int age) {        this.age = age;    }    public int getId() {        return id;    }    @XmlAttribute    public void setId(int id) {        this.id = id;    }} 

.

package com.mkyong.core;import java.io.File;import javax.xml.bind.JAXBContext;import javax.xml.bind.JAXBException;import javax.xml.bind.Marshaller;public class JAXBExample {    public static void main(String[] args) {      Customer customer = new Customer();      customer.setId(100);      customer.setName("mkyong");      customer.setAge(29);      try {        File file = new File("C:\\file.xml");        JAXBContext jaxbContext = JAXBContext.newInstance(Customer.class);        Marshaller jaxbMarshaller = jaxbContext.createMarshaller();        // output pretty printed        jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);        jaxbMarshaller.marshal(customer, file);        jaxbMarshaller.marshal(customer, System.out);          } catch (JAXBException e) {              e.printStackTrace();          }    }}

If using another library is an option, the following may be easier:

package for_so;import java.io.File;import rasmus_torkel.xml_basic.read.TagNode;import rasmus_torkel.xml_basic.read.XmlReadOptions;import rasmus_torkel.xml_basic.read.impl.XmlReader;public class Q7704827_SimpleRead{    public static void    main(String[] args)    {        String fileName = args[0];        TagNode emailNode = XmlReader.xmlFileToRoot(new File(fileName), "EmailSettings", XmlReadOptions.DEFAULT);        String recipient = emailNode.nextTextFieldE("recipient");        String sender = emailNode.nextTextFieldE("sender");        String subject = emailNode.nextTextFieldE("subject");        String description = emailNode.nextTextFieldE("description");        emailNode.verifyNoMoreChildren();        System.out.println("recipient =  " + recipient);        System.out.println("sender =     " + sender);        System.out.println("subject =    " + subject);        System.out.println("desciption = " + description);    }}

The library and its documentation are at rasmustorkel.com