Java XML 的序列化和反序列化

🏷️ XML Java

代码来自 java xml 与实体对象 互相转换 ，增加了泛型的支持。

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.io.*;

public class XMLUtil {
    /**
     * 将对象直接转换成 String 类型的 XML 输出
     *
     * @param obj
     * @return
     */
    public static String convertToXml(Object obj) {
        // 创建输出流
        StringWriter sw = new StringWriter();
        try {
            // 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);
            // 将对象转换成输出流形式的 xml
            marshaller.marshal(obj, sw);
        } catch (JAXBException e) {
            e.printStackTrace();
        }
        return sw.toString();
    }

    /**
     * 将对象根据路径转换成 xml 文件
     *
     * @param obj
     * @param path
     * @return
     */
    public static void convertToXml(Object obj, String path) {
        try {
            // 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);
            // 将对象转换成输出流形式的 xml
            // 创建输出流
            FileWriter fw = null;
            try {
                fw = new FileWriter(path);
            } catch (IOException e) {
                e.printStackTrace();
            }
            marshaller.marshal(obj, fw);
        } catch (JAXBException e) {
            e.printStackTrace();
        }
    }

    @SuppressWarnings("unchecked")
    /**
     * 将 String 类型的 xml 转换成对象
     */
    public static <T> T convertXmlStrToObject(Class<T> clazz, String xmlStr) {
        T xmlObject = null;
        try {
            JAXBContext context = JAXBContext.newInstance(clazz);
            // 进行将 Xml 转成对象的核心接口
            Unmarshaller unmarshaller = context.createUnmarshaller();
            StringReader sr = new StringReader(xmlStr);
            XMLInputFactory xif = XMLInputFactory.newFactory();
            XMLStreamReader xsr = xif.createXMLStreamReader(sr);
            xmlObject = unmarshaller.unmarshal(xsr, clazz).getValue();
        } catch (JAXBException e) {
            e.printStackTrace();
        } catch (XMLStreamException e) {
            e.printStackTrace();
        }
        return xmlObject;
    }

    @SuppressWarnings("unchecked")
    /**
     * 将 file 类型的 xml 转换成对象
     */
    public static <T> T convertXmlFileToObject(Class<T> clazz, String xmlPath) {
        T xmlObject = null;
        try {
            JAXBContext context = JAXBContext.newInstance(clazz);
            Unmarshaller unmarshaller = context.createUnmarshaller();
            FileReader fr = null;
            try {
                fr = new FileReader(xmlPath);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            XMLInputFactory xif = XMLInputFactory.newFactory();
            XMLStreamReader xsr = xif.createXMLStreamReader(fr);
            xmlObject = unmarshaller.unmarshal(xsr, clazz).getValue();
        } catch (JAXBException e) {
            e.printStackTrace();
        } catch (XMLStreamException e) {
            e.printStackTrace();
        }
        return xmlObject;
    }
}