如何格式化XML xml格式化输出
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;/** * Created by IntelliJ IDEA. * User: tsaowe * Date: 11-9-1 * Time: 上午9:13 */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>