XML字符串转换

org.w3c.dom.Document doc =
  javax.xml.parsers.DocumentBuilderFactory.newInstance().newDocumentBuilder(
        ).parse(
   new org.xml.sax.InputSource(new java.io.StringReader(xmlString)));

试试这个:

import java.io.IOException;

import org.apache.xerces.parsers.DOMParser;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;



public class String2XML {

    public static void main(String[] args) throws SAXException, IOException {
        String xml="<persons><person><name>Someone</name><age>27</age></person><person><name>Otherone</name><age>43</age></person></persons>";
        DOMParser parser = new DOMParser();
        parser.parse(new InputSource(new java.io.StringReader(xml))); 
        Document doc = parser.getDocument();
        System.out.println("String2XML.main()-"+doc.toString());
    }
}

不要忘记在类路径中包含xercesimpl.jar和xml-apis.jar。你可以在这里找到它们 http://archive.apache.org/dist/xml/xerces-j/binaries/