JDK自帶XML和java物件相互轉換
阿新 • • 發佈：2019-02-05
下面使用的是JDK自帶的類，沒有引用任何第三方jar包。
Unmarshaller 類使客戶端應用程式能夠將 XML 資料轉換為 Java 內容物件樹。
備註：marshal(序列化、排列、整理)
Marshaller 類使客戶端應用程式能夠將 Java 內容樹轉換回 XML 資料。
package hb.jaxb;
import javax.xml.bind.annotation.XmlRootElement;
//1、需要轉換的model物件一定要新增@XmlRootElement註解，其裡面的其他物件(Classroom)則不需要
@XmlRootElement
public class Student {
private int id;
private String name;
private int age;
private Classroom classroom;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Classroom getClassroom() {
return classroom;
}
public void setClassroom(Classroom classroom) {
this.classroom = classroom;
}
public Student(int id, String name, int age, Classroom classroom) {
super();
this.id = id;
this.name = name;
this.age = age;
this.classroom = classroom;
}
//無參夠著函式一定需要，否則JXBContext無法正常解析。
public Student() {
super();
}
}package hb.jaxb;
//2、需要轉換的model物件一定要有不帶引數的構造方法，包括該物件裡面引用的物件。
public class Classroom {
private int id;
private String name;
private int grade;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getGrade() {
return grade;
}
public void setGrade(int grade) {
this.grade = grade;
}
public Classroom(int id, String name, int grade) {
super();
this.id = id;
this.name = name;
this.grade = grade;
}
public Classroom() {
super();
}
}package hb.jaxb;
import java.io.StringReader;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import org.junit.Test;
//Eclipse console
//中文亂碼解決 eclipse-->Run-->Run Configuration-->Common--> Console Encoding-->Others-->UTF-8
//參考博文：http://hbiao68.iteye.com/blog/1958413
public class TestJaxb {
@Test
public void beanToXML() {
Classroom classroom = new Classroom(1, "軟體工程", 4);
Student student = new Student(101, "張三", 22, classroom);
try {
JAXBContext context = JAXBContext.newInstance(Student.class);
Marshaller marshaller = context.createMarshaller();
marshaller.marshal(student, System.out);
} catch (JAXBException e) {
e.printStackTrace();
}
}
@Test
public void XMLStringToBean(){
String xmlStr = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><student><age>22</age><classroom><grade>4</grade><id>1</id><name>軟體工程</name></classroom><id>101</id><name>張三</name></student>";
try {
JAXBContext context = JAXBContext.newInstance(Student.class);
Unmarshaller unmarshaller = context.createUnmarshaller();
Student student = (Student)unmarshaller.unmarshal(new StringReader(xmlStr));
System.out.println(student.getAge());
System.out.println(student.getClassroom().getName());
} catch (JAXBException e) {
e.printStackTrace();
}
}
}參考博文：