Java读取xml文件

写了一篇xml的文章，点发布发表不上，点舍去就他妈的一下子全没了，连回收站和草稿箱都没有了，真不知道怎么想CSDN 

参考http://blog.csdn.net/yangzl2008/article/details/7045369

废话不多说了，贴代码：

/**
 * 
 */
package com.zlp.test.xml;

import java.io.File;
import java.util.Iterator;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;


/**
 * @author Administrator
 *
 */
public class XmlRead extends DefaultHandler{

	/**
	 * @param args
	 */
	/*
	 * DOM
	 */
	public void TestDOM(){
		DocumentBuilderFactory factory = DocumentBuilderFactory   
        .newInstance();
		Document doc = null;
		try {
			DocumentBuilder builder = factory.newDocumentBuilder();
			doc = builder.parse(new File("test.xml"));
		} catch (Exception e) {
			e.printStackTrace();
		} 
		
		String str = doc.getElementsByTagName("name").item(0).getFirstChild().getNodeValue().trim();
		System.out.println(str);
	}

	/*
	 * dom4j
	 */
	public void Dom4jReadTest(){
		File f = new File("test.xml");
		SAXReader saxReader = new SAXReader();
		org.dom4j.Document document = null;
		 try {
			document = saxReader.read(f);
		} catch (DocumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		Element rootElement = document.getRootElement();
		Iterator iterator = rootElement.elementIterator("node");
		
		for (; iterator.hasNext();) {
			Element other = (Element)iterator.next();
			System.out.println(other.elementTextTrim("name"));
		}
	}
	
	public void SAX(){
		java.util.Stack tags = new java.util.Stack();   
		SAXParserFactory saxparserfactory = SAXParserFactory.newInstance();
		try {
			SAXParser parser = saxparserfactory.newSAXParser();
			parser.parse(new InputSource("test.xml"), new XmlRead());
		
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
		java.util.Stack tags = new java.util.Stack();
		public void startElement(String uri, String localName, String qName,Attributes attrs) {
			tags.push(qName);
		}
	
	  public void characters(char ch[], int start, int length)
	  	throws SAXException {

		  String tag = (String) tags.peek();
			if (tag.equals("name")) {
			      System.out.print("name" + new String(ch, start, length));
			}
			if (tag.equals("space")) {
			      System.out.println("space:" + new String(ch, start, length));
			}
}

	
	
	public static void main(String[] args) {
		//new XmlRead().TestDOM();
		new XmlRead().Dom4jReadTest();
		//new XmlRead().SAX();
	}
	
	

}

test.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<list>
 <node>
  <name>
   weidewei
  </name>
  <space>
   http://wishlife.iteye.com
  </space>
 </node>
</list>

Sax解析xml

package com.zlp.test.xml;

import java.io.File; 
import java.util.Vector; 

import org.xml.sax.Attributes; 
import org.xml.sax.SAXException; 
import org.xml.sax.helpers.DefaultHandler; 

import javax.xml.parsers.SAXParser; 
import javax.xml.parsers.SAXParserFactory; 

public class PraseXML extends DefaultHandler 
{ 

  private Vector<String> tagName; 

  private Vector<String> tagValue; 

  private int step; 
  // 开始解析XML文件 
  public void startDocument() throws SAXException 
  { 
    tagName = new Vector<String>(); 
    tagValue = new Vector<String>(); 
    step = 0; 
  } 
  // 结束解析XML文件 
  public void endDocument() throws SAXException 
  { 
    for (int i = 0; i < tagName.size(); i++) 
    { 
      if (!tagName.get(i).equals("") || tagName.get(i) != null) 
      { 
        System.out.println("节点名称：" + tagName.get(i)); 
        System.out.println("节点值：" + tagValue.get(i)); 
      } 
    } 
  } 
  /** 
    * 在解释到一个开始元素时会调用此方法.但是当元素有重复时可以自己写算法来区分 
    * 这些重复的元素.qName是什么? <name:page ll=""></name:page>这样写就会抛出SAXException错误 
    * 通常情况下qName等于localName 
    */ 
  public void startElement(String uri, String localName, String qName, 
      Attributes attributes) throws SAXException 
  { 
    // 节点名称 
    tagName.add(qName); 
    // 循环输出属性 
    for (int i = 0; i < attributes.getLength(); i++) 
    { 
      // 获取属性名称 
      System.out.println("属性名称：" + attributes.getQName(i)); 
      // 获取属性值 
      System.out.println("属性值：" 
          + attributes.getValue(attributes.getQName(i))); 
    } 

  } 

  /** 
    * 在遇到结束标签时调用此方法 
    */ 
  public void endElement(String uri, String localName, String qName) 
      throws SAXException 
  { 

    step = step + 1; 
  } 

  /** 
    * 读取标签里的值,ch用来存放某行的xml的字符数据,包括标签,初始大小是2048, 
    * 每解释到新的字符会把它添加到char[]里。    * 注意,这个char字符会自己管理存储的字符, 
    * 并不是每一行就会刷新一次char,start,length是由xml的元素数据确定的, 
    * 暂时找不到规律,以后看源代码. 
    *    
    * 这里一个正标签，反标签都会被执行一次characters，所以在反标签时不用获得其中的值 
    */ 
  public void characters(char ch[], int start, int length) 
      throws SAXException 
  { 
    // 只要当前的标签组的长度一至，值就不赋，则反标签不被计划在内 
    if (tagName.size() - 1 == tagValue.size()) 
    { 
      tagValue.add(new String(ch, start, length)); 
    } 
  } 

  public static void main(String[] args) 
  { 
    String filename = "test.xml"; 
    SAXParserFactory spf = SAXParserFactory.newInstance(); 
    try 
    { 
      SAXParser saxParser = spf.newSAXParser(); 
      saxParser.parse(new File(filename), new PraseXML()); 
    } 
    catch (Exception e) 
    { 
      e.printStackTrace(); 
    } 
  } 
  public Vector getTagName() 
  { 
    return tagName; 
  } 
  public void setTagName(Vector tagName) 
  { 
    this.tagName = tagName; 
  } 
  public Vector getTagValue() 
  { 
    return tagValue; 
  } 

  public void setTagValue(Vector tagValue) 
  { 
    this.tagValue = tagValue; 
  } 

} 

在贴上一个simplejee中读取xml的文件。

package com.yuqiaotech.simplejee.xml;

import java.io.File;  
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Iterator;  
  
import javax.xml.parsers.DocumentBuilder;  
import javax.xml.parsers.DocumentBuilderFactory;  
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;  
import javax.xml.parsers.SAXParserFactory;  
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
  
import org.dom4j.DocumentException;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;  
import org.dom4j.io.XMLWriter;
import org.w3c.dom.Document;  
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;  
import org.xml.sax.Attributes;  
import org.xml.sax.SAXException;  
import org.xml.sax.helpers.DefaultHandler;  

import com.sun.org.apache.xpath.internal.XPathAPI;
/**
 * 大体代码是从http://www.javaeye.com/topic/181865抄来的。
 * 下面这个是被广泛抄袭的，关于java里读取xml的概要介绍。
 * http://blog.csdn.net/geekwang/archive/2008/05/25/2480504.aspx 
 * 
 * 我主要是把从绝对路径读取xml换成了从classpath读取。
 * 另外添加了Transformer和xslt，以及XPath的演示，以及相关的一些链接。
 * 
 * 另外可以搜一下jaxp了解这个规范的相关内容。
 * 
 * @author YUQIAOTECH
 *
 */
public class SimpleSample  {  
  static String xmlName = "test.xml";
  static String xlst = "xslt.xsl";
  static String dom4jSaveTo = "c:/text.xml";
  static String xsltSaveTo = "c:/text2.html";
  

    /** 
     * DOM方式 
     */  
    public void DOM() {  
        long lasting = System.currentTimeMillis();  
  
        try {  
            InputStream in = SimpleSample.class.getResourceAsStream(xmlName); 
            DocumentBuilderFactory factory = DocumentBuilderFactory  
                    .newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();  
            Document doc = builder.parse(in); //注意这里的Document是org.w3c.dom包下的
            NodeList nl = doc.getElementsByTagName("node");  
            for (int i = 0; i < nl.getLength(); i++) {  
                System.out.println("|| Name:  |"  
                        + doc.getElementsByTagName("name").item(i)  
                                .getFirstChild().getNodeValue());  
                System.out.println("||Space:  |"  
                        + doc.getElementsByTagName("space").item(i)  
                                .getFirstChild().getNodeValue());  
                System.out.println("-------------------------------------------------");            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        System.out.println("耗时："  
                + (System.currentTimeMillis() - lasting) + " MS");  
    }  
  
    class SaxHandler extends DefaultHandler{
    	java.util.Stack tags = new java.util.Stack();  
        public void startElement(String uri, String localName, String qName,  
                Attributes attrs) {  
            tags.push(qName);  
        }  
      
        public void characters(char ch[], int start, int length)  
                throws SAXException {  
            String tag = (String) tags.peek();  
            if (tag.equals("name")) {  
                System.out.println("|| Name:  |" + new String(ch, start, length));  
            }  
            if (tag.equals("space")) {  
                System.out.println("||Space:  |" + new String(ch, start, length));  
            }  
            System.out.println("-------------------------------------------------");  
        }  
    }
  
    /** 
     * SAX方式 
     */  
    public void SAX() {  
  
        long lasting = System.currentTimeMillis();  
        try {  
        	InputStream in = SimpleSample.class.getResourceAsStream(xmlName); 
            SAXParserFactory sf = SAXParserFactory.newInstance();  
            SAXParser sp = sf.newSAXParser();  
            SaxHandler reader = new SaxHandler();  
            sp.parse(in, reader);  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        System.out.println("SAX 耗时："  
                + (System.currentTimeMillis() - lasting) + " MS");  
    }  
  

  
    /** 
     * 我懒得去了解JDOM了 :-)。
     * JDOM方式 
     */  
//    public void JDOM() {  
//        long lasting = System.currentTimeMillis();  
//        try {  
//            SAXBuilder builder = new SAXBuilder();  
//            org.jdom.Document doc = builder.build(new File("F:/xmltest.xml"));  
//            Element foo = doc.getRootElement();  
//            List allChildren = foo.getChildren();  
//            for (int i = 0; i < allChildren.size(); i++) {  
//                System.out.println("|| Name:  |"  
//                        + ((Element) allChildren.get(i)).getChild("name")  
//                                .getText());  
//                System.out.println("||Space:  |"  
//                        + ((Element) allChildren.get(i)).getChild("space")  
//                                .getText());  
//                System.out.println("-------------------------------------------------");            }  
//        } catch (Exception e) {  
//            e.printStackTrace();  
//        }  
//        System.out.println("JDOM RUNTIME："  
//                + (System.currentTimeMillis() - lasting) + " MS");  
//    }  
  
    /** 
     * DOM4J方式 
     */  
    public void DOM4J() {  
        long lasting = System.currentTimeMillis();  
        try {  
        	InputStream in = SimpleSample.class.getResourceAsStream(xmlName); 
            SAXReader reader = new SAXReader();  
            org.dom4j.Document doc = reader.read(in);  //注意这里的Document是org.dom4j包下的
            org.dom4j.Element root = doc.getRootElement();  
            org.dom4j.Element foo;  
            for (Iterator i = root.elementIterator("node"); i.hasNext();) {  
                foo = (org.dom4j.Element) i.next();  
                System.out.println("|| Name:  |" + foo.elementText("name"));  
                System.out.println("||Space:  |" + foo.elementText("space"));  
                System.out.println("-------------------------------------------------");  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        System.out.println("DOM4J 耗时："  
                + (System.currentTimeMillis() - lasting) + " MS");  
    }
    /**
     * 调用dom4j的保存方法。
     * 
     * @throws DocumentException
     * @throws IOException
     */
    public static void saveDocByDom4J() throws DocumentException, IOException{
        Writer out = new OutputStreamWriter(new FileOutputStream(dom4jSaveTo ),"GBK");
        OutputFormat format = OutputFormat.createPrettyPrint();
        XMLWriter writer = new XMLWriter( out, format );
    	InputStream in = SimpleSample.class.getResourceAsStream(xmlName); 
        SAXReader reader = new SAXReader();  
        org.dom4j.Document doc = reader.read(in);  
        writer.write( doc );
        out.close();
    }

    /**
     * 使用Transformer和xslt。
     * http://www.ibm.com/developerworks/cn/xml/x-xslt/
     * 
     * @throws ParserConfigurationException
     * @throws SAXException
     * @throws IOException
     */
	public static void saveByTransformer() throws ParserConfigurationException, SAXException, IOException {
		try {
			InputStream in = SimpleSample.class.getResourceAsStream(xmlName); 
			InputStream inXsl = SimpleSample.class.getResourceAsStream(xlst); 
	        DocumentBuilderFactory factory = DocumentBuilderFactory  
	                .newInstance();  
	        DocumentBuilder builder = factory.newDocumentBuilder();  
	        Document doc = builder.parse(in); 
	        StreamSource style = new StreamSource(inXsl); 
			TransformerFactory tFactory = TransformerFactory.newInstance();
			Transformer transformer = tFactory.newTransformer(style);
			transformer.setOutputProperty(OutputKeys.ENCODING, "GBK");
			DOMSource source = new DOMSource(doc);
			StreamResult result = new StreamResult(new File(xsltSaveTo));
			transformer.transform(source, result);
		} catch (TransformerConfigurationException e) {
			throw new RuntimeException(e.getMessage(), e);
		} catch (TransformerException e) {
			throw new RuntimeException(e.getMessage(), e);
		}
	}
	
	//**********************XPath*****************************
	
	/**
	 * 返回指定的节点。
	 * 
	 * @param topNode
	 * @param xPath
	 * @return
	 */
	public static Node selectSingleNode(Node topNode, String xPath) {
		try {
			return XPathAPI.selectSingleNode(topNode, xPath);
		} catch (TransformerException e) {
			System.out.println(e.getMessage() + " xPath=" + xPath);
			throw new RuntimeException(e.getMessage(), e);
		}
	}

	/**
	 * 根据属性名获取属性节点。
	 * 
	 * @param node
	 * @param attributeName
	 * @return
	 */
	public static Node getAttributeNode(Node node, String attributeName) {
		NamedNodeMap namedNodeMap = node.getAttributes();
		return namedNodeMap.getNamedItem(attributeName);
	}

	/**
	 * 几个方法的组合。
	 * 
	 * @param node
	 * @param xPath
	 * @param attributeName
	 * @return
	 */
	public static String getAttributeNodeByXPath(Node node, String xPath,
			String attributeName) {
		Node rtn = null;
		Node selectedNode = selectSingleNode(node, xPath);
		if (selectedNode != null) {
			rtn = getAttributeNode(selectedNode, attributeName);
		}
		if(rtn == null)return null;
		return rtn.getNodeValue();
	}
	/**
	 * http://www.zvon.org/xxl/XPathTutorial/General_chi/examples.html
	 * http://www.ibm.com/developerworks/cn/xml/x-wxxm35.html
	 * 
	 * @throws ParserConfigurationException
	 * @throws SAXException
	 * @throws IOException
	 */
	public static void XPath() throws ParserConfigurationException, SAXException, IOException{
		InputStream in = SimpleSample.class.getResourceAsStream(xmlName); 
        DocumentBuilderFactory factory = DocumentBuilderFactory  
                .newInstance();  
        DocumentBuilder builder = factory.newDocumentBuilder();  
        Document doc = builder.parse(in); 
        String attr = getAttributeNodeByXPath(doc,"//node[@id=1]/name","alias");
        System.out.println("alias="+attr);
        
	}
    public static void main(String arge[]) throws ParserConfigurationException, SAXException, IOException, DocumentException {  
        SimpleSample myXML = new SimpleSample();  
        System.out.println("=====================DOM=========================");  
        myXML.DOM();  
        System.out.println("=====================SAX=========================");  
        myXML.SAX();  
        //System.out.println("=====================JDOM========================");  
        //myXML.JDOM();  
        System.out.println("=====================DOM4J=======================");  
        myXML.DOM4J();  
        System.out.println("=====================DOM4J的格式化保存=======================");   
        saveDocByDom4J();
        System.out.println("=====================Transformer和xslt的使用=======================");  
        saveByTransformer();
        System.out.println("=====================XPath的演示======================="); 
        XPath();
    }  
}  

test1.xml

<?xml version="1.0" encoding="gbk"?>
<list>
 <node id="1"><name alias="李逵">张三</name><space>http://wishlife.javaeye.com</space></node>
 <node><name>李四</name><space>http://user.qzone.qq.com/94611981</space></node>
</list>  

xslt.xsl

<xsl:transform
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:variable name="nodes" select="//node"/>
<xsl:template match="list">
<html><body>
 <h1>名单</h1>
 <table cellpadding="5">
 <tr>
 <td>姓名</td>
 <td>博客</td>
 </tr>
 <xsl:for-each select="$nodes">
 <tr>
 <td> <xsl:value-of select="./name"/>(<xsl:value-of select="./name/@alias"/>)</td>
 <td> <xsl:value-of select="./space"/></td>
 </tr>
 </xsl:for-each>
 </table>
</body></html>
</xsl:template>
</xsl:transform>