java中XML格式的字符串4读取方式的简单比较

1.java自带的DOM解析.
import java.io.StringReader;  
import javax.xml.parsers.DocumentBuilder;  
import javax.xml.parsers.DocumentBuilderFactory;  
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;  
 
public class ReaderXmlForDOM {  
 
    public static void main(String args[]) {  
          String text ="<XML><A>123</A><B>whl123</B><C>亮亮</C><D>1</D><E>1</E><F>165074</F><G>贫穷</G><H>1698.0</H><I>初级士官</I><J>湖南</J><K>常德</K><L>1</L></XML>" 
           
         long begin = System.currentTimeMillis();  
          parse( text );  
         long after = System.currentTimeMillis();  
          System.out.println("DOM用时"+(after-begin)+"毫秒");  
         }  
      
    public static void parse(String protocolXML) {  
           
        try {  
             DocumentBuilderFactory factory = DocumentBuilderFactory  
                     .newInstance();  
             DocumentBuilder builder = factory.newDocumentBuilder();  
             Document doc = builder  
                     .parse(new InputSource(new StringReader(protocolXML)));  
 
             Element root = doc.getDocumentElement();  
             NodeList books = root.getChildNodes();  
            if (books != null) {  
                for (int i = 0; i < books.getLength(); i++) {  
                     Node book = books.item(i);  
                     System.out.println("节点=" + book.getNodeName() + "\ttext=" 
                             + book.getFirstChild().getNodeValue());  
                 }  
             }  
         } catch (Exception e) {  
             e.printStackTrace();  
         }  
     }  
} 
我当时dom解析用时是个不稳定的值在62-78毫秒之间.
以下的三种方法mian方法里面都是一样的解析那段字符串,记录用时,就不在贴出, 只贴出所用的解析部分
2.java自带的SAX解析.
import javax.xml.parsers.SAXParser;  
import javax.xml.parsers.SAXParserFactory;  
import org.xml.sax.InputSource;  
import org.xml.sax.SAXException;  
import org.xml.sax.helpers.DefaultHandler;  
 
public class ReaderXmlForSAX {  
public static void parse(String protocolXML) {  
           
        try {  
             SAXParserFactory saxfac = SAXParserFactory.newInstance();     
             SAXParser saxparser = saxfac.newSAXParser();  
             TestSAX   tsax = new TestSAX();  
             saxparser.parse(new InputSource(new StringReader(protocolXML)),tsax);  
         } catch (Exception e) {  
             e.printStackTrace();  
         }  
     }  
}  
 
class TestSAX extends DefaultHandler{  
      
    private StringBuffer buf;  
    private String str;  
    public TestSAX(){  
         super();  
     }  
       
    public void startDocument() throws SAXException{  
         buf=new StringBuffer();  
         System.out.println("*******开始解析XML*******");  
     }  
      
    public void endDocument() throws SAXException{          
         System.out.println("*******XML解析结束*******");  
     }  
       
    public void endElement(String namespaceURI,String localName,String fullName )throws SAXException{  
         str = buf.toString();  
         System.out.println("节点="+fullName+"\tvalue="+buf+" 长度="+buf.length());  
         System.out.println();  
         buf.delete(0,buf.length());  
       }  
      
    public void characters( char[] chars, int start, int length )throws SAXException{  
        //将元素内容累加到StringBuffer中  
         buf.append(chars,start,length);  
     }  
} 
SAX用时是62毫秒,最快的.但是需要多写一个类
3.DOM4J解析,需要下载对应的jar包
import java.util.Iterator;  
import java.util.List;  
import org.dom4j.Document;  
import org.dom4j.DocumentHelper;  
import org.dom4j.Element;  
 
public class ReaderXmlForDOM4J {  
//DOM4j解析XML  
    public static void parse(String protocolXML) {  
          
        try {  
 
             Document doc=(Document)DocumentHelper.parseText(protocolXML);  
             Element books = doc.getRootElement();  
             System.out.println("根节点"+books.getName());  
            // Iterator users_subElements = books.elementIterator("UID");//指定获取那个元素  
             Iterator   Elements = books.elementIterator();  
            while(Elements.hasNext()){  
                Element user = (Element)Elements.next();  
                System.out.println("节点"+user.getName()+"\ttext="+user.getText());  
                List   subElements = user.elements();  
            //    List user_subElements = user.elements("username");指定获取那个元素  
//              System.out.println("size=="+subElements.size());  
//              for( int i=0;i<subElements.size();i++){  
//                  Element ele = (Element)subElements.get(i);  
//                  System.out.print(ele.getName()+" : "+ele.getText()+" ");  
//              }  
                System.out.println();  
            }  
         } catch (Exception e) {  
             e.printStackTrace();  
         }          
     }  
} 
DOM4J的用时为140毫秒,慢 并且还需要单独的jar包
4.JDOM解析,需要下载对应的jar包
import java.io.StringReader;  
import java.util.List;  
import org.jdom.Document;  
import org.jdom.Element;  
import org.jdom.input.SAXBuilder;  
import org.xml.sax.InputSource;  
 
public class ReaderXmlForJDOM {  
public static void parse(String protocolXML) {  
         SAXBuilder builder=new SAXBuilder(false);  
        try {  
             Document doc = builder.build(new InputSource(new StringReader(protocolXML)));  
             Element eles = doc.getRootElement(); // 得到根元素  
             System.out.println("根节点"+eles.getName());  
              
             List<Element> list = eles.getChildren(); // 得到元素的集合  
            //List studentList = students.getChildren("student"); // 得到指定元素（节点）的集合  
 
            if( list!=null){  
                for (int i = 0; i < list.size(); i++) {  
                     Element book = (Element)list.get(i);  
                     System.out.println("节点=" + book.getName() + "\ttext=" 
                             + book.getValue());  
                 }  
              }  
             } catch (Exception e) {  
             e.printStackTrace();  
         }  
     }  
} 
JDOM的用时为125毫秒,比较慢 并且还需要单独的jar包

评论

1 楼 fuyu_oo 2015-09-17  

多谢 正需要  用的第一种 java自带的