Java String转成XML

参考链接： Java StringReader类

import com.sun.org.apache.xml.internal.serialize.OutputFormat;

import com.sun.org.apache.xml.internal.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) {

        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>";

        System.out.println(new XmlFormatter().format(s));

    }

} 

直接运行main方法，可以看到打印出来格式化之后的xml文件。