XML解析工具类_JAVA_编程开发_程序员俱乐部

class="java" name="code">
package com.jackie.mytestproject.xmltest;

import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
 * @author jackie
 *
 */
public class XMLBuilder {

	/** xml string */
    private String xmlStr=null;
    /** xml对应的document */
    private Document doc=null;
    /** xml根结点 */
    private Element root=null;
    
    /**
     *构造函数说明：       <p>
     *参数说明：@param path   <p>
     * @throws IOException 
     * @throws SAXException 
     * @throws ParserConfigurationException 
    **/
    public XMLBuilder(String xmlStr) throws ParserConfigurationException, SAXException, IOException
    {
        this.xmlStr=xmlStr;
        doc = getDocument(xmlStr);
        buildRoot();
    }
      
    public Document getDocument(String xml) throws ParserConfigurationException, SAXException, IOException {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		DocumentBuilder builder = factory.newDocumentBuilder();
		StringReader sr = new StringReader(xml);
		InputSource is = new InputSource(sr);
		Document doc = builder.parse(is);
        return doc;
    }
      
    /**
    * 方法名称：buildRoot<p>
    * 方法功能：生成XML的根结点<p>
    * 参数说明： <p>
    * 返回：void <p>
    **/
    private void buildRoot()
    {
        root=doc.getDocumentElement();
    }
    
    public NodeList getNodeList()
    {
        return root.getChildNodes();
    }
    
    public Element [] getElementsByName(String name)
    {
        List<Node> resList=new ArrayList<Node>();
        NodeList nl=getNodeList();
        for(int i=0;i<nl.getLength();i++)
        {
            Node nd=nl.item(i);
            if(nd.getNodeName().equals(name))
            {
                resList.add(nd);
            }
        }
        Element [] res=new Element [resList.size()];
        for(int i=0;i<resList.size();i++)
        {
            res[0]=(Element)resList.get(i);
        }
        return res;
    }
      
    public static String getElementName(Element element)
    {
        return element.getNodeName();
    }
    
    public String getElementValue(Element element)
    {
        NodeList nl=element.getChildNodes();
        for(int i=0;i<nl.getLength();i++)
        {
            if(nl.item(i).getNodeType()==Node.TEXT_NODE)//是一个Text Node
            {            
                return element.getFirstChild().getNodeValue();
            }
        }   
        return null;
    }
    
    public String getElementAttr(Element element,String attr)
    {
        return element.getAttribute(attr);
    }
    
    /**
     * @return 返回 doc。
     */
    public Document getDoc()
    {
        return doc;
    }
    /**
     * @param doc 要设置的 doc。
     */
    public void setDoc(Document doc)
    {
        this.doc = doc;
    }
    /**
     * @return 返回 xmlStr。
     */
    public String getXmlStr()
    {
        return xmlStr;
    }
    /**
     * @param path 要设置的 xmlStr。
     */
    public void setXmlStr(String xmlStr)
    {
        this.xmlStr = xmlStr;
    }
    /**
     * @return 返回 root。
     */
    public Element getRoot()
    {
        return root;
    }
    /**
     * @param root 要设置的 root。
     */
    public void setRoot(Element root)
    {
        this.root = root;
    }
}

package com.jackie.mytestproject.xmltest;

import org.w3c.dom.Element;

public class XMLBuilderTester {

	public static void main(String[] args) {
		try {
			StringBuffer sb = new StringBuffer();
			sb.append("<MSG type=\"msg\" sequence=\"\" calltype=\"\">");
			sb.append("<Result code=\"0\" attr=\"test\" attr2=\"\" attr3=\"\" attr4=\"\"/>");
			sb.append("</MSG>");
			String xml = sb.toString();
			
			XMLBuilder xmlBl = new XMLBuilder(xml);
			Element[] eList = xmlBl.getElementsByName("Result");
			System.out.println(xmlBl.getElementValue(eList[0]));
			System.out.println(xmlBl.getElementAttr(eList[0], "attr"));
		} catch(Exception e) {
			e.printStackTrace();
		}
	}
}