Java实体类转xml，利用Marshaller生成xml

不说什么了，直接上代码吧！

import java.io.StringReader;
import java.io.StringWriter;

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



/**
 * Jaxb工具类 xml和java类相互转换
 * @author Gxf
 * @date 2020-5-12
 */
public class JaxbXmlUtil {

    public static final String DEFAULT_ENCODING = "UTF-8";

    /**
     * pojo转换成xml 默认编码UTF-8
     *
     * @param obj 待转化的对象
     * @return xml格式字符串
     * @throws Exception JAXBException
     */
    public static String convertToXml(Object obj) throws Exception {
        return convertToXml(obj, DEFAULT_ENCODING);
    }

    /**
     * pojo转换成xml
     * @param obj 待转化的对象
     * @param encoding 编码
     * @return xml格式字符串
     * @throws Exception JAXBException
     */
    public static String convertToXml(Object obj, String encoding) throws Exception {
        String result = null;
        JAXBContext context = JAXBContext.newInstance(obj.getClass());
        Marshaller marshaller = context.createMarshaller();
        // 指定是否使用换行和缩排对已编组 XML 数据进行格式化的属性名称。
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding);

        StringWriter writer = new StringWriter();
        marshaller.marshal(obj, writer);
        result = writer.toString();
        return result;
    }

    /**
     * pojo转换成xml ,不声明XML头部信息
     *
     * @param obj 待转化的对象
     * @param encoding 编码
     * @return xml格式字符串
     * @throws Exception JAXBException
     */
    public static String convertToXmlNoHead(Object obj, String encoding) throws Exception {
        String result = null;
        JAXBContext context = JAXBContext.newInstance(obj.getClass());
        Marshaller marshaller = context.createMarshaller();
        // 指定是否使用换行和缩排对已编组 XML 数据进行格式化的属性名称。
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, false);
        marshaller.setProperty(Marshaller.JAXB_FRAGMENT,true);
        marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding);

        StringWriter writer = new StringWriter();
        marshaller.marshal(obj, writer);
        result = writer.toString();

        return result;
    }


    /**
     * xml转换成JavaBean
     *
     * @param xml xml格式字符串
     * @param t 待转化的对象
     * @return 转化后的对象
     * @throws Exception JAXBException
     */
    @SuppressWarnings("unchecked")
    public static <T> T convertToJavaBean(String xml, Class<T> t) throws Exception {
        T obj = null;
        JAXBContext context = JAXBContext.newInstance(t);
        Unmarshaller unmarshaller = context.createUnmarshaller();
        obj = (T) unmarshaller.unmarshal(new StringReader(xml));
        return obj;
    }
}
           

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