使用Marshaller 将Java对象转化为XML格式

1. 对象转xml内容
   ①工具类

   public static String convertObjectToXml(Object obj) throws Exception {
       StringWriter writer = new StringWriter();
   
       // 创建 JAXBContext 和 Marshaller
       JAXBContext context = JAXBContext.newInstance(obj.getClass());
       Marshaller marshaller = context.createMarshaller();
   
       // 设置 Marshaller 属性
       // 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);
       // 指定是否带有xml报文头
       marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
   
       marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
   
       // 将 Java 对象转换成 XML 标签
       marshaller.marshal(obj, writer);
   
       return writer.toString();
   }
   

   ②嵌套对象

   import javax.xml.bind.annotation.XmlAccessType;
   import javax.xml.bind.annotation.XmlAccessorType;
   import javax.xml.bind.annotation.XmlRootElement;
   
   /**
    * Created with IntelliJ IDEA.
    *
    * @Author: Administrator
    * @Date: 2023/04/17/13:32
    * @Description:
    */
   
   @XmlRootElement(name = "WinResponse")
   @XmlAccessorType(XmlAccessType.FIELD)
   public class WinResponse {
   
       private RowItem rowItem;
   
       public WinResponse() {
       }
   
       public WinResponse(RowItem rowItem) {
           this.rowItem = rowItem;
       }
   
       public RowItem getRowItem() {
           return rowItem;
       }
   
       public void setRowItem(RowItem rowItem) {
           this.rowItem = rowItem;
       }
   }	
   

   import javax.xml.bind.annotation.XmlRootElement;
   
   /**
    * Created with IntelliJ IDEA.
    *
    * @Author: Administrator
    * @Date: 2023/04/17/13:32
    * @Description:
    */
   @XmlRootElement
   public class RowItem {
   
       private String brlb;
   
       private String codetype;
   
       private String code;
   
       public RowItem() {
       }
       public RowItem(String brlb, String codetype, String code) {
           this.brlb = brlb;
           this.codetype = codetype;
           this.code = code;
       }
   
       public String getBrlb() {
           return brlb;
       }
   
       public void setBrlb(String brlb) {
           this.brlb = brlb;
       }
   
       public String getCodetype() {
           return codetype;
       }
   
       public void setCodetype(String codetype) {
           this.codetype = codetype;
       }
   
       public String getCode() {
           return code;
       }
   
       public void setCode(String code) {
           this.code = code;
       }
   }
   

③效果图

2. 字符串转xml标签

   /**
    * 
     * @param value 标签内的值
     * @param xml 标签名称
     * @return
     * @throws Exception
     */
   public static String convertStringToXml(String value, String xml) throws Exception {
           // 创建一个新的 XML 文档
           DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
           DocumentBuilder builder = factory.newDocumentBuilder();
           Document doc = builder.newDocument();
   
           // 创建根元素
           Element rootElement = doc.createElement(xml);
           doc.appendChild(rootElement);
   
           // 创建子元素并设置文本内容
           rootElement.setTextContent(value);
   
           // 将 XML 文档转换为字符串
           TransformerFactory tfactory = TransformerFactory.newInstance();
           Transformer transformer = tfactory.newTransformer();
           transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
           transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
           StringWriter writer = new StringWriter();
           transformer.transform(new DOMSource(doc), new StreamResult(writer));
   
           return writer.toString();
       }