Xsd to java object online

How to create pojo classes from xsd in Java?

Creating POJO (Plain Old Java Object) classes from XSD (XML Schema Definition) is a common task in Java programming. XSD defines the structure of an XML document, including the data types and elements, and is used to validate the XML document. The POJO classes are used to represent the data in a Java object, making it easier to manipulate the data in a Java program. There are several methods available to create POJO classes from XSD, and each method has its own advantages and disadvantages. The following methods can be used to generate POJO classes from XSD in Java:

Method 1: Using JAXB

JAXB is a Java API for XML binding that allows Java objects to be mapped to XML representations. It can be used to generate Java classes from an XML schema definition (XSD) file. Here are the steps to create POJO classes from XSD using JAXB:

Step 1: Add JAXB dependencies to your project

Add the following dependencies to your project’s pom.xml file:

dependency> groupId>javax.xml.bindgroupId> artifactId>jaxb-apiartifactId> version>2.3.1version> dependency> dependency> groupId>com.sun.xml.bindgroupId> artifactId>jaxb-coreartifactId> version>2.3.0.1version> dependency> dependency> groupId>com.sun.xml.bindgroupId> artifactId>jaxb-implartifactId> version>2.3.2version> dependency>

Step 2: Create XSD file

Create an XSD file that describes the structure of the XML data you want to map to Java objects.

xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> xs:element name="person" type="personType"/> xs:complexType name="personType"> xs:sequence> xs:element name="name" type="xs:string"/> xs:element name="age" type="xs:int"/> xs:sequence> xs:complexType> xs:schema>

Step 3: Generate Java classes from XSD

Use the xjc command-line tool provided by JAXB to generate Java classes from the XSD file. Run the following command in your project directory:

xjc -d src/main/java -p com.example.generated xsd/person.xsd

This will generate Java classes in the src/main/java/com/example/generated directory.

Step 4: Use generated Java classes

Now that you have generated Java classes from the XSD file, you can use them in your Java code to manipulate XML data. Here is an example:

import com.example.generated.Person; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Unmarshaller; import java.io.File; public class Main  public static void main(String[] args)  try  File file = new File("person.xml"); JAXBContext jaxbContext = JAXBContext.newInstance(Person.class); Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller(); Person person = (Person) jaxbUnmarshaller.unmarshal(file); System.out.println(person.getName()); System.out.println(person.getAge()); > catch (JAXBException e)  e.printStackTrace(); > > >

This code reads an XML file named person.xml and unmarshals it into a Person object. The getName() and getAge() methods can be used to retrieve the values of the name and age elements in the XML file.

That’s it! You have successfully created POJO classes from XSD using JAXB.

Method 2: Using XSD to Java code generator tool

One of the easiest ways to create POJO classes from XSD is by using a code generator tool. In Java, there are many code generator tools available, such as JAXB, Castor, and XStream. Here, we will use JAXB to generate Java classes from XSD.

Step 1: Add JAXB dependencies

First, we need to add JAXB dependencies to our project. If you are using Maven, you can add the following dependencies to your pom.xml file:

dependency> groupId>javax.xml.bindgroupId> artifactId>jaxb-apiartifactId> version>2.3.1version> dependency> dependency> groupId>org.glassfish.jaxbgroupId> artifactId>jaxb-runtimeartifactId> version>2.3.1version> dependency>

Step 2: Create XSD file

Next, we need to create an XSD file. For example, let’s create a simple XSD file named person.xsd :

 xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="http://example.com/person" xmlns="http://example.com/person" elementFormDefault="qualified"> xs:element name="person"> xs:complexType> xs:sequence> xs:element name="name" type="xs:string"/> xs:element name="age" type="xs:int"/> xs:sequence> xs:complexType> xs:element> xs:schema>

Step 3: Generate Java classes

Now, we can use the xjc tool (part of the JDK) to generate Java classes from the XSD file. Here is an example command to generate the classes:

xjc -d src/main/java -p com.example.person person.xsd

This command will generate the Java classes in the com.example.person package under the src/main/java directory.

Step 4: Use generated Java classes

Finally, we can use the generated Java classes in our code. Here is an example code snippet to create a Person object and marshal it to XML:

import com.example.person.Person; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Marshaller; import java.io.StringWriter; public class Main  public static void main(String[] args) throws JAXBException  Person person = new Person(); person.setName("John"); person.setAge(30); JAXBContext jaxbContext = JAXBContext.newInstance(Person.class); Marshaller marshaller = jaxbContext.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); StringWriter writer = new StringWriter(); marshaller.marshal(person, writer); System.out.println(writer.toString()); > >

This code will output the following XML:

 person xmlns="http://example.com/person"> name>Johnname> age>30age> person>

That’s it! We have successfully generated Java classes from XSD using the JAXB code generator tool.

Method 3: Manually writing POJO classes

To manually create POJO classes from XSD in Java, follow these steps:

1. First, create a new Java package to hold your POJO classes.
2. Next, create a new Java class for each complex type defined in the XSD file. The class name should match the name of the complex type, and it should have member variables for each element in the complex type.

public class MyComplexType  private String element1; private int element2; public String getElement1()  return element1; > public void setElement1(String element1)  this.element1 = element1; > public int getElement2()  return element2; > public void setElement2(int element2)  this.element2 = element2; > >

1. If the XSD file defines any simple types, create a new Java class for each one. The class name should match the name of the simple type, and it should have a single member variable of the appropriate type.

public class MySimpleType  private String value; public String getValue()  return value; > public void setValue(String value)  this.value = value; > >

1. If the XSD file defines any enumerations, create a new Java enum for each one. The enum name should match the name of the enumeration, and it should have a member for each enumeration value.

public enum MyEnum  VALUE1, VALUE2, VALUE3 >

1. If the XSD file defines any attributes, add member variables to the appropriate classes to represent them.

public class MyComplexType  private String element1; private int element2; private String attribute1; public String getElement1()  return element1; > public void setElement1(String element1)  this.element1 = element1; > public int getElement2()  return element2; > public void setElement2(int element2)  this.element2 = element2; > public String getAttribute1()  return attribute1; > public void setAttribute1(String attribute1)  this.attribute1 = attribute1; > >

1. Finally, create a new Java class to represent the root element of the XML document. This class should have member variables for each top-level element in the XSD file.

public class MyRootElement  private MyComplexType complexType; private MySimpleType simpleType; private MyEnum myEnum; public MyComplexType getComplexType()  return complexType; > public void setComplexType(MyComplexType complexType)  this.complexType = complexType; > public MySimpleType getSimpleType()  return simpleType; > public void setSimpleType(MySimpleType simpleType)  this.simpleType = simpleType; > public MyEnum getMyEnum()  return myEnum; > public void setMyEnum(MyEnum myEnum)  this.myEnum = myEnum; > >

That’s it! You’ve now manually created POJO classes to represent the elements in your XSD file. You can use these classes to parse and generate XML documents using a variety of Java libraries, such as JAXB or XMLBeans.

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