xml格式化，xml格式化代码

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));  

    }  

}