XMl各种格式转换功能代码

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.StringReader;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.jdom2.input.SAXBuilder;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
public class XmlKit {
    /**
     * dom4j解析xml
     */
    public static org.dom4j.Document xmlTodDocDom4j(String path){
        File file = new File(path);
        org.dom4j.Document doc = null;
        try {
             doc = new SAXReader().read(file);
        } catch (DocumentException e) {
            e.printStackTrace();
        }
        return doc;
    }
    public static String docToString(org.dom4j.Document document){
        String xmlStr = document.asXML();
        return xmlStr;
    }
    public static org.dom4j.Document stringToXmlDom4j(String xmlStr){
        org.dom4j.Document doc = null;
        try {
            doc = DocumentHelper.parseText(xmlStr);
        } catch (DocumentException e) {
            e.printStackTrace();
        }
        return doc;
    }
     /** 
     * Document 保存为 XML 文件 
     *  
     * @param doc Document对象 
     * @param path 文件路径 
     */  
    public static void doc2XMLDom4j(org.dom4j.Document doc, String path) {  
        try {  
            XMLWriter xmlWriter = new XMLWriter(new FileWriter(path));
            xmlWriter.write(doc);
            xmlWriter.flush();  
            xmlWriter.close();  
        } catch (Exception e) {  
            return;  
        }  
    }  
    /**
     * jdom解析xml
     */
    public static org.jdom2.Document xmlTodDocJdom(String path){
        File file = new File(path);
        org.jdom2.Document doc = null;
        try {
             doc =new SAXBuilder().build(file);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return doc;
    }
    public static String docToString(org.jdom2.Document doc){
        String xmlStr = "";
        Format format = Format.getPrettyFormat();      
        format.setEncoding("UTF-8");//配置xml文档的字符为gb2312，解决中文问题      
        XMLOutputter xmlout = new XMLOutputter(format);     
        ByteArrayOutputStream bo = new ByteArrayOutputStream();     
        try {
            xmlout.output(doc,bo);
        } catch (IOException e) {
            e.printStackTrace();
        }      
        xmlStr = bo.toString();
    return xmlStr;
    }
    public static org.jdom2.Document stringTodDocJdom (String xmlStr){
            org.jdom2.Document doc = null;
            StringReader sr = new StringReader(xmlStr);     
            InputSource is = new InputSource(sr);     
            try {
                doc =(new SAXBuilder()).build(is);
            } catch (Exception e) {
                e.printStackTrace();
            } 
        return doc;
    }
     /** 
     * DOCUMENT格式化输出保存为XML 
     *  
     * @param doc JDOM的Document 
     * @param filePath 输出文件路径 
     * @throws Exception 
     */  
    public static void doc2XML(org.jdom2.Document doc, String filePath) throws Exception{  
        Format format = Format.getCompactFormat();   
        format.setEncoding("UTF-8"); //设置XML文件的字符为UTF-8  
        format.setIndent("     ");//设置缩进   
        XMLOutputter outputter = new XMLOutputter(format);//定义输出 ,在元素后换行，每一层元素缩排四格   
        FileWriter writer = new FileWriter(filePath);//输出流  
        outputter.output(doc, writer);  
        writer.close();  
    }  
    /**
     * jdk api解析xml
     */
    public static Document xmlTodDoc(String path){
        File file = new File(path);
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();  
        DocumentBuilder builder = null;  
        Document doc = null;
        try {
            builder = factory.newDocumentBuilder();
            doc = builder.parse(file);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return doc;
    }
    public static String xmlToString(Document doc){
            String xmlStr = "";
            TransformerFactory  tf  =  TransformerFactory.newInstance();    
            Transformer t;
            try {
                t = tf.newTransformer();
                ByteArrayOutputStream  bos  =  new  ByteArrayOutputStream();   
                t.transform(new DOMSource(doc), new StreamResult(bos));    
                xmlStr = bos.toString();    
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }    
        return xmlStr;
    }
    public static Document stringToXml(String xmlStr){
            Document doc = null;
            StringReader sr = new StringReader(xmlStr);   
            InputSource is = new InputSource(sr);   
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();   
            DocumentBuilder builder;
            try {
                builder = factory.newDocumentBuilder();
                doc = builder.parse(is);  
            } catch (Exception e) {
                e.printStackTrace();
            }    
        return doc;
    }
     /** 
     * Document 保存为 XML 文件 
     *  
     * @param doc Document对象 
     * @param path 文件路径 
     */  
    public static void doc2XML(Document doc, String path) {  
        try {  
            Source source = new DOMSource(doc);  
            Result result = new StreamResult(new File(path));  
            Transformer transformer = TransformerFactory.newInstance().newTransformer();  
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");  
            transformer.transform(source, result);  
        } catch (Exception e) {  
            return;  
        }  
    }  
}
 dom4J 解析文档
org.dom4j.Element element =  doc.getRootElement();
        System.out.println(element.getName());
        List<org.dom4j.Element> iter = element.elements();
        for (org.dom4j.Element elem : iter) {
            System.out.println(elem.getName());
            if(elem.getName().equals("HeadInfo")){
                System.out.println(elem.attributeValue("PGMVersion"));
            };
            if(elem.getName().equals("PGM")){
                List<org.dom4j.Element> subIter = elem.elements();
                for (org.dom4j.Element el : subIter) {
                    System.out.println(el.getName());
                    System.out.println(el.attributeValue("ItemType"));
                    if(el.attributeValue("ItemType").equals("1")){
                        List<org.dom4j.Element> subEl = el.elements();
                        for (org.dom4j.Element e : subEl) {
                            System.out.println(e.getName());
                        }
                    }
                }
            }
        }