JavaBean 与 xml 互转的方法详解
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
public class JaxbUtil {
/**
JavaBean 装换成 xml 默认编码 UTF-8
@param obj
@return
*/
public static String converTomXml(Object obj) {
return converToXml(obj, "UTF-8");
}
/**
JavaBean 装换成 xml
@param obj
@param encoding
@return
*/
private static String converToXml(Object obj, String encoding) {
String result = null;
try {
JAXBContext context = JAXBContext.newInstance(obj.getClass());
Marshaller marshaller = context.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding);
StringWriter writer = new StringWriter();
marshaller.marshal(obj, writer);
result = writer.toString();
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
xml 装换成 JavaBean
@param xml
@param c
@return
*/
@SuppressWarnings("unchecked")
public static <T> T converyToJavaBean(String xml, Class<T> c) {
T t = null;
try {
JAXBContext context = JAXBContext.newInstance(c);
Unmarshaller unmarshaller = context.createUnmarshaller();
t = (T) unmarshaller.unmarshal(new StringReader(xml));
} catch (Exception e) {
e.printStackTrace();
}
return t;
}
}
2、简单类型?
（1）单实体类转换
package com.guor.demo.beanToXml;
import java.util.Date;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement
@XmlType(name = "book", propOrder = { "author", "calendar", "price", "id" })
public class Book {
@XmlElement(required = true)
private String author;
@XmlElement(name = "price_1", required = true)
private float price;
@XmlElement
private Date calenda
r;
@XmlAttribute
private Integer id;
/**
@return
*/
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
public Date getCalendar() {
return calendar;
}
public void setCalendar(Date calendar) {
this.calendar = calendar;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@Override
public String toString() {
return "Book [author=" + author + ", price=" + price + ", calendar=" + calendar + ", id=" + id + "]";
}
}
（2）test?
package com.guor.demo.beanToXml;
import java.util.Date;
import org.junit.Test;
import javax.xml.bind.JAXBException;
@SuppressWarnings("unused")
public class JaxbTest1 {
/**
@throws JAXBException
*/
@Test
public void showMarshaller() {
Book book = new Book();
book.setId(100);
book.setAuthor("lin");
book.setCalendar(new Date());
book.setPrice(23.56f);
String str = JaxbUtil.converTomXml(book);
System.out.println(str);
}
/**
@throws JAXBException
*/
@Test
public void showUnMarshaller() {
String str = "<?xml version ="1.0" encoding="UTF-8" standalone="yes"?>" + "<book id ="100">"
"<author>lin</author>" + "<calendar>2018-9-3T11:58.006</calendar>" + "<price_1>23.56</price_1>"
"</book>";
Book book = JaxbUtil.converyToJavaBean(str, Book.class);
System.out.println(book);
}
}
（3）控制台输出
3、类中包含复杂对象的转换
（1）实体类 1
package com.guor.demo.beanToXml;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "student")
@XmlType(propOrder = {})
public class Student {
@XmlAttribute
private Integer id;
@XmlElement
private String name;
@XmlElement(name = "role")
private Role role;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Role getRole() {
return role;
}
public void setRole(Role role) {
this.role = role;
}
@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", role=" + role + "]";
}
}
（2）实体类 2?
package com.guor.demo.beanToXml;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlType;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(propOrder = { "name", "desc" })
public class Role {
@XmlElement
private String name;
@XmlElement
private String desc;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
@Override
public String toString() {
return "Role [name=" + name + ",desc=" + desc + "]";
}
}
（3）test?
package com.guor.demo.beanToXml;
import org.junit.Test;
public class JaxbTest2 {
@Test
public void showMarshaller() {
Student student = new Student();
student.setId(12);
student.setName("nihao");
Role role = new Role();
role.setDesc("管理");
role.setName("班长");
student.setRole(role);
String str = JaxbUtil.converTomXml(student);
System.out.println(str);
}
@Test
public void showUnMarshaller() {
String str = "<?xml version ="1.0" encoding="UTF-8" standalone="yes"?>" + "<student id ="12">"
"<name>nihao</name>" + "<role>" + "<desc>管理</desc>" + "<name>班长</name>" + "</role>" + "</student>";
Student student = JaxbUtil.converyToJavaBean(str, Student.class);
System.out.println(student);
}
}
（4）控制台输出?
4、集合对象的转换（同样适用于 Set）
（1）实体类 1
package com.guor.demo.beanToXml;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "country")
@XmlType(propOrder = { "name", "provinceList" })
public class Country {
@XmlElement(name = "country_name")
private String name;
@XmlElementWrapper(name = "provinces")
@XmlElement(name = "province")
private List<Province> provinceList;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<Province> getProvinceList() {
return provinceList;
}
public void setProvinceList(List<Province> provinceList) {
this.provinceList = provinceList;
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