转：java与xml相互转化 jaxb

 

转自：http://www.tuicool.com/articles/zEnQBn

 

 

先贴java

package a;

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.XmlTransient;
import javax.xml.bind.annotation.XmlType;

@XmlType
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "Student")
public class Student {

    /**
     * 做为node的属性
     */
    @XmlAttribute
    private String name;

    private String sex;

    /**
     * 自定义节点名称
     */
    @XmlElement(name = "theAge")
    private Integer age;
    
    /**
     * 不转化xml， 忽略掉
     */
    @XmlTransient
    private String remark = "remark...";

    public Student() {
        super();
    }

    public Student(String name, String sex, Integer age) {
        super();
        this.name = name;
        this.sex = sex;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

}

 

 

package a;

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;

@XmlType
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "Teacher")
public class Teacher {

    private String name;

    private String sex;

    private Integer age;

    /**
     * 在Student数组外面加一个包含节点students
     */
    @XmlElementWrapper(name = "students")
    @XmlElement(name="Student")
    private List<Student> students;

    public Teacher() {
        super();
    }

    public Teacher(String name, String sex, Integer age) {
        super();
        this.name = name;
        this.sex = sex;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public List<Student> getStudents() {
        return students;
    }

    public void setStudents(List<Student> students) {
        this.students = students;
    }

}

 

 

 

package a;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.StringReader;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

public class JaxbUtil {
    
    /**
     * java -> xml String
     * 
     */
    public static String java2xml(Object obj, Class beanClass) throws Exception {
        
        JAXBContext context = JAXBContext.newInstance(beanClass);
        // 根据上下文获取marshaller对象
        Marshaller marshaller = context.createMarshaller();
        // 设置编码字符集
        marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
        // 格式化XML输出，有分行和缩进
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        // 打印到控制台
        //marshaller.marshal(obj, System.out);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        marshaller.marshal(obj, baos);
        String xmlObj = new String(baos.toByteArray());
        return xmlObj.replace(" standalone=\"yes\"", "");
      }
      
      /**
       * java -> xml file
       * 
       */
      public static void java2xmlFile(Object obj, Class beanClass, File file) throws Exception {
        JAXBContext context = JAXBContext.newInstance(beanClass);
        // 根据上下文获取marshaller对象
        Marshaller marshaller = context.createMarshaller();
        // 设置编码字符集
        marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
        // 格式化XML输出，有分行和缩进
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        // 打印到控制台
        //marshaller.marshal(obj, System.out);
        marshaller.marshal(obj, file);
      }
      
      /**
       * xml -> java
       * 
       */
      public static <T> T xml2java(String xml, Class<T> beanClass) throws Exception {
        T bean = beanClass.newInstance();
        JAXBContext context = JAXBContext.newInstance(beanClass);
        Unmarshaller unmarshaller = context.createUnmarshaller();
        bean = (T) unmarshaller.unmarshal(new StringReader(xml));
        return bean;
      }
      
      
      /**
       * xml file -> java
       * 
       */
      public static <T> T xmlFile2java(File file, Class<T> beanClass) throws Exception {
        T bean = beanClass.newInstance();
        JAXBContext context = JAXBContext.newInstance(beanClass);
        Unmarshaller unmarshaller = context.createUnmarshaller();
        bean = (T) unmarshaller.unmarshal(file);
        return bean;
      }
      
      
}

 

 

package a;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class JaxbTest {
    public static void main(String[] args) {
        try {
            Teacher teacher = new Teacher("JuanJuan", "女", 22);
            Student student = new Student("Joyce.Luo", "男", 21);
            Student student2 = new Student("Phang.Law", "男", 18);
            
          
            List<Student> stuList = new ArrayList<Student>();
            stuList.add(student);
            stuList.add(student2);
            
            teacher.setStudents(stuList);
            
            String xmlStr = JaxbUtil.java2xml(student, Student.class);
            System.out.println("\n对象转换为xml：\n" + xmlStr);
            
            String xmlTeaStr = JaxbUtil.java2xml(teacher, Teacher.class);
            System.out.println("\n包含集合的对象转换为xml：\n" + xmlTeaStr);
            
            
            String xmlStr3 = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><Student name=\"Joyce.Luo\"><sex>男</sex><theAge>21</theAge></Student>";
            Student student3 = JaxbUtil.xml2java(xmlStr3, Student.class);
            System.out.println("xml字符串转化为对象：" + student3.getName());

            File file = new File("file/str.xml");
            if (file.exists()) {
                file.delete();
            }
            
            JaxbUtil.java2xmlFile(teacher, Teacher.class, file);
            System.out.println("\n对象转换为xml file：" + file.length());
      
            Teacher tea = JaxbUtil.xmlFile2java(file, Teacher.class);
            System.out.println("\nxml file转换为对象：\n" + tea.getName() + "\t" + tea.getSex() + "\t" + tea.getStudents().get(0).getName());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}