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MyXmlToUser.java - Unmarshal XML File to Data Object to
How to unmarshal XML files to data objects using JAXB API?
✍: FYIcenter.com
If you want to unmarshal xml files to data objects using JAXB API,
you can follow these suggestions:
1. Create a JAXBContext instance with the package name of the data type classes generated with the JAXB XJC tool:
JAXBContext c = JAXBContext.newInstance("com.fyicenter.demo");
2. Then create an Unmarshaller instance from the JAXBContext:
Unmarshaller m = c.createUnmarshaller();
3. Finally, unmarshal the XML file to a data object with the Unmarshaller:
User u = (User) m.unmarshal(new FileInputStream("User.xml"));
Here is the entire example program, MyXmlToUser.java:
// Copyright (c) FYIcenter.com import com.fyicenter.demo.User; import javax.xml.bind.JAXBContext; import javax.xml.bind.Unmarshaller; import java.io.*; public class MyXmlToUser { public static void main(String[] args) throws Exception { String x = "User.xml"; if (args.length < 1) { System.out.println("USAGE: java MyXmlToUser xml"); System.exit(-1); } x = args[0]; System.out.println("Unmarshal XML file to user object..."); JAXBContext c = JAXBContext.newInstance("com.fyicenter.demo"); Unmarshaller m = c.createUnmarshaller(); User u = (User) m.unmarshal(new FileInputStream(x)); System.out.println("My user object:"); System.out.println(" Name: "+u.getName()); System.out.println(" BirthDate: "+u.getBirthDate()); System.out.println(" Sex: "+u.getSex()); System.out.println(" ID: "+u.getID()); } }
Compile and run MyXmlToUser.java as shown below.
fyicenter$ cd src fyicenter> java -cp .:../jaxb-ri/mod/jaxb-api.jar:\ ../jaxb-ri/mod/jaxb-runtime.jar:\ ../jaxb-ri/mod/istack-commons-runtime.jar:\ ../jaxb-ri/mod/javax.activation-api.jar \ MyXmlToUser.java UserOutput.xml Unmarshal XML file to user object... My user object: Name: Frank Y. Ivy BirthDate: 1970-01-01+00:01 Sex: Male ID: 101
If you are still using Java 8, the test also works.
fyicenter> \local\jdk-1.8.0\bin\javac MyXmlToUser.java fyicenter> \local\jdk-1.8.0\bin\java MyXmlToUser UserOutput.xml Unmarshal XML file to user object... My user object: Name: Frank Y. Ivy BirthDate: 1970-01-01+00:01 Sex: Male ID: 101
⇒ Unmarshaller with No Default Data Validation
⇐ MyUserToXml.java - Marshal Data Object to XML File
2017-06-30, 1456👍, 0💬
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