XML格式化工具类(java)

import org.apache.catalina.tribes.membership.StaticMember;
import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.XMLSerializer;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;

public class XmlFormatter {
    public  String format(String unformattedXml) {
        try {
            final Document document = parseXmlFile(unformattedXml);
            OutputFormat format = new OutputFormat(document);
            format.setLineWidth(65);
            format.setIndenting(true);
            format.setIndent(2);
            Writer out = new StringWriter();
            XMLSerializer serializer = new XMLSerializer(out, format);
            serializer.serialize(document);
            return out.toString();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    private Document parseXmlFile(String in) {
        try {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            InputSource is = new InputSource(new StringReader(in));
            return db.parse(is);
        } catch (ParserConfigurationException e) {
            throw new RuntimeException(e);
        } catch (SAXException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) throws Exception{
        String s = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><PARAM><DBID>35</DBID><SEQUENCE>atgtca</SEQUENCE><MAXNS>10</MAXNS><MINIDENTITIES>90</MINIDENTITIES><MAXEVALUE>10</MAXEVALUE><USERNAME>admin</USERNAME><PASSWORD>111111</PASSWORD><TYPE>P</TYPE><RETURN_TYPE>2</RETURN_TYPE></PARAM>";//未格式化前的xml
        System.out.println(new XmlFormatter().format(s));
        
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<PARAM>
  <DBID>35</DBID>
  <SEQUENCE>atgtca</SEQUENCE>
  <MAXNS>10</MAXNS>
  <MINIDENTITIES>90</MINIDENTITIES>
  <MAXEVALUE>10</MAXEVALUE>
  <USERNAME>admin</USERNAME>
  <PASSWORD>111111</PASSWORD>
  <TYPE>P</TYPE>
  <RETURN_TYPE>2</RETURN_TYPE>
</PARAM>