JAXB java类与xml互转

package com.demo.bean;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
import java.util.Arrays;

@XmlRootElement
public class UserInfo {
    private int id;
    private String name;
    private String gender;
    private String addr;
    private String[] hobbys;

    public UserInfo() {
    }

    public UserInfo(int id, String name, String gender, String addr, String[] hobbys) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.addr = addr;
        this.hobbys = hobbys;
    }
    @XmlElement
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }
    @XmlElement
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    @XmlElement
    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }
    @XmlElement
    public String getAddr() {
        return addr;
    }

    public void setAddr(String addr) {
        this.addr = addr;
    }
    //使用@XmlElementWrapper注解后，将会在原xml结点上再包装一层xml
    //@XmlElementWrapper仅允许出现在集合属性上
    @XmlElementWrapper(name="allhobbys")
    @XmlElement(name="hobby")
    public String[] getHobbys() {
        return hobbys;
    }

    public void setHobbys(String[] hobbys) {
        this.hobbys = hobbys;
    }

    @Override
    public String toString() {
        return "UserInfo{" +
                "id=" + id +
                ", name=‘" + name + ‘\‘‘ +
                ", gender=‘" + gender + ‘\‘‘ +
                ", addr=‘" + addr + ‘\‘‘ +
                ", hobbys=" + Arrays.toString(hobbys) +
                ‘}‘;
    }
}

import com.demo.bean.UserInfo;
import org.junit.Test;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import java.io.File;
import java.io.StringReader;
import java.io.StringWriter;

public class Test01 {
    @Test
    public void test(){
        UserInfo user = new UserInfo(1,"张三","男","杭州",new String[]{"篮球","音乐"});
        String xmlStr = objToXML(user);
        System.out.println(xmlStr);
        System.out.println("---------------------------------------------------------------");
        UserInfo getUser = (UserInfo)xmlStrToObj(xmlStr,UserInfo.class);
        System.out.println(getUser);
        System.out.println("---------------------------------------------------------------");
        //编组输出到文件中
        objToXmlFile(user,"E:\\user.xml");
        UserInfo getUser1 = (UserInfo)xmlFileToObj("E:\\user.xml",UserInfo.class);
        System.out.println(getUser1);
    }

    public String objToXML(Object obj){
        try {
            //根据obj类生成上下文对象
            JAXBContext context = JAXBContext.newInstance(obj.getClass());
            //从上下文中获取Marshaller对象，用作将bean编组(转换)为xml
            Marshaller marshaller = context.createMarshaller();
            //设置编码格式（默认编码就是utf-8）
            marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");//GB2312
            //以下是为生成xml做的一些配置
            //是否格式化生成的xml，即按标签自动换行，否则就是一行输出
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.FALSE);
            // 是否省略xml头部信息,默认不省略（false）
            marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
            StringWriter stringWriter = new StringWriter();
            marshaller.marshal(obj, stringWriter);
            StringBuilder stringBuilders = new StringBuilder();
            return stringBuilders.append(stringWriter).toString();
        } catch (JAXBException e) {
            e.printStackTrace();
        }
        return null;
    }

    public void objToXmlFile(Object obj,String fileUrl){
        try {
            File file = new File(fileUrl);
            //根据obj类生成上下文对象
            JAXBContext context = JAXBContext.newInstance(obj.getClass());
            //从上下文中获取Marshaller对象，用作将bean编组(转换)为xml
            Marshaller marshaller = context.createMarshaller();
            //设置编码格式（默认编码就是utf-8）
            marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");//GB2312
            //以下是为生成xml做的一些配置
            //是否格式化生成的xml，即按标签自动换行，否则就是一行输出
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
            // 是否省略xml头部信息,默认不省略（false）
            marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
            marshaller.marshal(obj,file);
        } catch (JAXBException e) {
            e.printStackTrace();
        }
    }

    public Object xmlStrToObj(String xmlStr,Class objClass){
        try {
            JAXBContext jc = JAXBContext.newInstance(objClass);
            Unmarshaller unmar = jc.createUnmarshaller();
            Object obj = unmar.unmarshal(new StringReader(xmlStr));
            return obj;
        } catch (JAXBException e) {
            e.printStackTrace();
        }
        return null;
    }

    public Object xmlFileToObj(String xmlFileUrl,Class objClass){
        try {
            File file = new File(xmlFileUrl);
            JAXBContext jc = JAXBContext.newInstance(objClass);
            Unmarshaller unmar = jc.createUnmarshaller();
            Object obj = unmar.unmarshal(file);
            return obj;
        } catch (JAXBException e) {
            e.printStackTrace();
        }
        return null;
    }
}

public class DateAdapter extends XmlAdapter<String, Date> {
    private static final SimpleDateFormat SDF = new SimpleDateFormat("yyyy-MM-dd");
 
    @Override
    public Date unmarshal(String date) throws Exception {
        return SDF.parse(date);
    }
 
    @Override
    public String marshal(Date date) throws Exception {
        return SDF.format(date);
    }
}