使用XJC將XML Schema輸出成POJO

上次發了一篇JAXB POJO to XML / XML to POJO，那篇忘記寫下有工具可以幫助我們快速產生POJO
所以就開一篇來寫啦XD
JDK的Bin資料夾內有個叫做XJC的工具，它可以將XML Schema輸出成POJO
我們這邊資料用「XML Schema Tutorial」

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="note">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="to" type="xs:string"/>
        <xs:element name="from" type="xs:string"/>
        <xs:element name="heading" type="xs:string"/>
        <xs:element name="body" type="xs:string"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

輸入下方指令就會產生出POJO程式碼

xjc.exe path.xsd

ObjectFactory.java：

//
// 此檔案是由 JavaTM Architecture for XML Binding(JAXB) Reference Implementation, v2.2.8-b130911.1802 所產生 
// 請參閱 <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a> 
// 一旦重新編譯來源綱要, 對此檔案所做的任何修改都將會遺失. 
// 產生時間: 2019.05.20 於 02:58:44 PM CST 
//


package generated;

import javax.xml.bind.annotation.XmlRegistry;


/**
 * This object contains factory methods for each 
 * Java content interface and Java element interface 
 * generated in the generated package. 
 * <p>An ObjectFactory allows you to programatically 
 * construct new instances of the Java representation 
 * for XML content. The Java representation of XML 
 * content can consist of schema derived interfaces 
 * and classes representing the binding of schema 
 * type definitions, element declarations and model 
 * groups.  Factory methods for each of these are 
 * provided in this class.
 * 
 */
@XmlRegistry
public class ObjectFactory {


    /**
     * Create a new ObjectFactory that can be used to create new instances of schema derived classes for package: generated
     * 
     */
    public ObjectFactory() {
    }

    /**
     * Create an instance of {@link Note }
     * 
     */
    public Note createNote() {
        return new Note();
    }

}

Note.java：

//
// 此檔案是由 JavaTM Architecture for XML Binding(JAXB) Reference Implementation, v2.2.8-b130911.1802 所產生 
// 請參閱 <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a> 
// 一旦重新編譯來源綱要, 對此檔案所做的任何修改都將會遺失. 
// 產生時間: 2019.05.20 於 02:58:44 PM CST 
//


package generated;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;


/**
 * <p>anonymous complex type 的 Java 類別.
 * 
 * <p>下列綱要片段會指定此類別中包含的預期內容.
 * 
 * <pre>
 * &lt;complexType>
 *   &lt;complexContent>
 *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 *       &lt;sequence>
 *         &lt;element name="to" type="{http://www.w3.org/2001/XMLSchema}string"/>
 *         &lt;element name="from" type="{http://www.w3.org/2001/XMLSchema}string"/>
 *         &lt;element name="heading" type="{http://www.w3.org/2001/XMLSchema}string"/>
 *         &lt;element name="body" type="{http://www.w3.org/2001/XMLSchema}string"/>
 *       &lt;/sequence>
 *     &lt;/restriction>
 *   &lt;/complexContent>
 * &lt;/complexType>
 * </pre>
 * 
 * 
 */
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "to",
    "from",
    "heading",
    "body"
})
@XmlRootElement(name = "note")
public class Note {

    @XmlElement(required = true)
    protected String to;
    @XmlElement(required = true)
    protected String from;
    @XmlElement(required = true)
    protected String heading;
    @XmlElement(required = true)
    protected String body;

    /**
     * 取得 to 特性的值.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getTo() {
        return to;
    }

    /**
     * 設定 to 特性的值.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setTo(String value) {
        this.to = value;
    }

    /**
     * 取得 from 特性的值.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getFrom() {
        return from;
    }

    /**
     * 設定 from 特性的值.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setFrom(String value) {
        this.from = value;
    }

    /**
     * 取得 heading 特性的值.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getHeading() {
        return heading;
    }

    /**
     * 設定 heading 特性的值.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setHeading(String value) {
        this.heading = value;
    }

    /**
     * 取得 body 特性的值.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getBody() {
        return body;
    }

    /**
     * 設定 body 特性的值.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setBody(String value) {
        this.body = value;
    }

}

那這工具不錯用，或許也是我們快速去產生POJO的其中一種方法吧

參考資料：
https://www.w3schools.com/xml/schema_intro.asp
https://docs.oracle.com/javase/8/docs/technotes/tools/unix/xjc.html