在java中解析xml数据

Question

i have one requirement to get the data from the xml.

String res;

the data will be in the string res as follows.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<person>
  <id>QZhx_w1eEJ</id>
  <first-name>pratap</first-name>
  <last-name>murukutla</last-name>
</person>

i have to get the id and the first-name and last-name from this data and has to be stored in the variables id,first-name,last-name

how to access the xml to get those details.

Answer 1

You could use JAXB (JSR-222) and do the following. An implementation is included in Java SE 6.

Demo

package forum10520757;

import java.io.StringReader;
import javax.xml.bind.*;
import javax.xml.bind.annotation.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(Person.class);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        StringReader xml = new StringReader("<person><id>QZhx_w1eEJ</id><first-name>pratap</first-name><last-name>murukutla</last-name></person>");
        Person person = (Person) unmarshaller.unmarshal(xml);

        System.out.println(person.id);
        System.out.println(person.firstName);
        System.out.println(person.lastName);
    }

    @XmlRootElement
    @XmlAccessorType(XmlAccessType.FIELD)
    static class Person {
        String id;

        @XmlElement(name="first-name")
        String firstName;

        @XmlElement(name="last-name")
        String lastName;
    }

}

Output

QZhx_w1eEJ
pratap
murukutla

Answer 2

You can start with:

ByteArrayInputStream inputStream = 
    new ByteArrayInputStream(response.getBody().getBytes("UTF-8"));
DocumentBuilder builder = DocumentBuilderFactory.newInstance()
    .newDocumentBuilder();
Document doc = builder.parse(new InputSource(inputStream));

You can see an example in http://www.java2s.com/Code/Java/XML/XMLDocumentinformationbyDOM.htm

Answer 3

Use a SAX or DOM parser that's built into Java. Parse the String into a DOM tree, walk the tree, get your values.

http://java.sun.com/xml/tutorial_intro.html