java生成Xml, 解决Xml自闭合问题

因为别人的接口要求是Xml文件。并且有很多自定义标签。

并且要求不能自闭合。

import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
public class UserInfo {

    private String username;

    private String password;

}

import java.io.File;
import java.lang.reflect.Field;

import javax.xml.parsers.documentBuilder;
import javax.xml.parsers.documentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.document;
import org.w3c.dom.Element;
public class DomXmlUtil {


	public static void main(String[] args) {
		Long start = System.currentTimeMillis();
		createXml();
		System.out.println("运行时间：" + (System.currentTimeMillis() - start));
	}

	
	public static Element buildXml(String one, Object dataItem, document document) throws Exception {
		Element header = document.createElement(one);
		//如果为空就返回一级
		if (null == dataItem) {
			return header;
		}
		Field[] fields = dataItem.getClass().getDeclaredFields();
		for (Field field : fields) {
			//设置是否允许访问，不是修改原来的访问权限修饰词。
			field.setAccessible(true);
			Element element = document.createElement(field.getName().toUpperCase());
			//根据字段名
			element.setTextContent(String.valueOf(field.get(dataItem)));
			header.appendChild(element);
		}
		return header;
	}

	
	public static void createXml() {
		try {
			// 创建解析器工厂
			documentBuilderFactory factory = documentBuilderFactory.newInstance();
			documentBuilder db = factory.newdocumentBuilder();
			document document = db.newdocument();
			document.setXmlStandalone(true);
			Element root = document.createElement("ROOT");
			UserInfo userInfo = new UserInfo();
			userInfo.setUsername("韩一聪");
			userInfo.setPassword("1111");
			Element data = buildXml("DATA", userInfo, document);
			root.appendChild(data);
			document.appendChild(root);
			// 创建TransformerFactory对象
			TransformerFactory tff = TransformerFactory.newInstance();
			// 创建 Transformer对象
			Transformer tf = tff.newTransformer();
			// 输出内容是否使用换行
			tf.setOutputProperty(OutputKeys.INDENT, "yes");
			// 创建xml文件并写入内容
			tf.transform(new DOMSource(document), new StreamResult(new File("test.xml")));
			System.out.println("生成test.xml成功");
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("生成test.xml失败");
		}
	}
	
}

private static String colseQuestion(org.w3c.dom.document w3cDoc) {
        org.dom4j.io.DOMReader reader = new DOMReader();
        org.dom4j.document document = reader.read(w3cDoc);
        //获取DATA
        org.dom4j.Element data = document.getRootElement().element("DATA");
        OutputFormat format = new OutputFormat();
        format.setEncoding("UTF-8");
        format.setExpandEmptyElements(true);
        StringWriter out = new StringWriter();
        XMLWriter writer = new XMLWriter(out, format);
        try {
            writer.write(data);
            writer.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return out.toString();
    }