JAXB实现xml字符串与对象互相转换

环境注明

本文为Java1.7、idea2017

1、创建实体类

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

@XmlRootElement(name="School")
@XmlType(propOrder={"schoolName","clazz"})
public class School{

    private String schoolName;
    private Clazz clazz;


    @XmlElement(name="SchoolName")
    public String getSchoolName(){
        returnschoolName;
    }

    public void setSchoolName(String schoolName){
        this.schoolName=schoolName;
    }

    @XmlElement(name="Class")
    public Clazz getClazz(){
        return clazz;
    }

    public void setClazz(Clazz clazz){
        this.clazz=clazz;
    }

public static classClazz{
    private String clazzName;
    private Student student;

    @XmlElement(name="ClassName")
    public String getClazzName(){
        return clazzName;
    }

    public void setClazzName(String clazzName){
        this.clazzName=clazzName;
    }

    @XmlElement(name="Student")
    public Student getStudent(){
        return student;
    }

    public void setStudent(Student student){
        this.student=student;
    }
}

public static class Student{

    private String studentName;

    @XmlElement(name="studentName")
    public String getStudentName(){
        return studentName;
    }

    public void setStudentName(String studentName){
        this.studentName=studentName;
    }
}
}

2、创建转换工具方法及测试Main

/**
*xmlString转换成对象
*
*createdbycaizhon2018-05-24v1.0
*/
public static Object convertXmlStrToObject(Classclazz,StringxmlStr)throws Exception{
    JAXBContext context=JAXBContext.newInstance(clazz);
    Unmarshaller unmarshaller=context.createUnmarshaller();
    StringReader sr=new StringReader(xmlStr);
    return unmarshaller.unmarshal(sr);
}

/**
*对象转换成xmlString
*
*createdbycaizhon2018-05-24v1.0
*/
public static String convertToXmlStr(Objectobj)throws Exception{
    //创建输出流
    StringWriter sw=new StringWriter();

    //利用jdk中自带的转换类实现
    JAXBContext context=JAXBContext.newInstance(obj.getClass());

    Marshaller marshaller=context.createMarshaller();
    //格式化xml输出的格式
    marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,Boolean.TRUE);
    //去掉生成xml的默认报文头
    //marshaller.setProperty(Marshaller.JAXB_FRAGMENT,Boolean.TRUE);
    marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
    //将对象转换成输出流形式的xml
    marshaller.marshal(obj,sw);

    return sw.toString();
}

public static void main(String[] args) throws Exception{
    School school=new School();
    school.setSchoolName("武汉工程大学");

    School.Clazz clazz=new School.Clazz();
    clazz.setClazzName("三年二班");

    School.Student student=new School.Student();
    student.setStudentName("周杰伦");
    clazz.setStudent(student);

    school.setClazz(clazz);

    String schoolXml= convertToXmlStr(school);
    System.out.println(schoolXml);

    School school1=(School)convertXmlStrToObject(School.class,schoolXml);
    System.out.println(school1.getClazz().getStudent().getStudentName());
}

测试结果

参考引用

Java注解（Annotation）：带你一步步探索神秘的注解（Annotation）

JAXB注解使用