java 操作XML

骑猪看日落 2022-09-17 15:18 140阅读 0赞

本文使用jdom.jar跟jaxen-1.1.1.jar工具来进行XML的写入跟解析：

import java.io.BufferedWriter;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.OutputStreamWriter;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.Random;
    import org.jdom.Document;
    import org.jdom.Element;
    import org.jdom.JDOMException;
    import org.jdom.input.SAXBuilder;
    import org.jdom.output.XMLOutputter;
    import com.boxun.bean.TestBean;
    
    /**
     * xml读写测试
     * @author admin_Hzw
     *
     */
    public class Test {
    
    	public static void main(String[] args) throws Exception {
    		List<TestBean> list = new ArrayList<TestBean>();
    		for (int i = 0; i < 10000; i++) {
    			TestBean t = new TestBean();
    			t.setId(i);  
    			t.setName("胡汉三");  
    			t.setTel("110");
    			list.add(t);  
    		}
    		writeXml(list);   
    	}  
    
    	/**
    	 * 写入xml
    	 * @param list
    	 * @throws Exception
    	 */
    	public static void writeXml(List<TestBean> list) throws Exception{
    		long wB = System.currentTimeMillis();
    		/*
    		 * 所有的XML元素都是 Element 的实例。根元素也不例外：
    		 */
    		Element rootElement = new Element("TestBean");  
    		Document myDocument = new Document(rootElement);//以根元素作为参数创建Document对象。一个Document只有一个根，即root元素。
    		for (int i = 0; i < list.size(); i++) {
    			TestBean t = list.get(i);  
    			Element iElement = new Element("B");//创建 name 元素
    			iElement.setAttribute("id", t.getId()+"");
    			rootElement.addContent(iElement);//将name元素作为content添加到根元素
    			Element nameElement = new Element("name");//创建 name 元素
    			nameElement.addContent(t.getName());//将kingwong作为content添加到name元素
    			iElement.addContent(nameElement);//将name元素作为content添加到根元素
    			Element telElement = new Element("tel");//创建 name 元素
    			telElement.addContent(t.getTel());//将kingwong作为content添加到name元素
    			iElement.addContent(telElement);//将name元素作为content添加到根元素
    		}
    		String path = "C://temp//temp"+System.currentTimeMillis()+new Random().nextInt(100000) ;
    		//如果使用格式化，那么文件大小将会增大
    		//XMLOutputter xmlOut = new XMLOutputter(Format.getPrettyFormat());
    		XMLOutputter xmlOut = new XMLOutputter();
    		File f = null;  
    		try {   
    			File ffFile = new File("C://temp");  
    			if(!ffFile.exists()){
    				ffFile.mkdir();
    			}
    			f = new File(path+".xml");
    			if(f.exists()){
    				f.delete();    
    			}   
    			f.createNewFile();   
    			OutputStreamWriter write = new OutputStreamWriter(new FileOutputStream(f),"UTF-8");   
    			BufferedWriter writer=new BufferedWriter(write);
    			writer.write(xmlOut.outputString(myDocument));      
    			writer.close();            
    			long wN = System.currentTimeMillis();      
    			System.out.println("写入用时："+(wN-wB)+"毫秒");
    			readXMLContent(f) ; //解析
    		} catch (IOException e) {            
    			e.printStackTrace();       
    		}
    	}
    
    
    	/**
    	 * 解析XML
    	 * @param f
    	 */
    	@SuppressWarnings("unchecked")
    	public static void readXMLContent(File f) {
    		long xB = System.currentTimeMillis();  
    		SAXBuilder builder = new SAXBuilder();
    		List<TestBean> listBean = new ArrayList<TestBean>();
    		try {
    			Document doc = builder.build(f);
    			Element rootEl = doc.getRootElement();
    			//获得所有子元素 
    			List<Element> list = rootEl.getChildren();
    			for (Element el : list) {
    				TestBean t = new TestBean();
    				//获取id属性值
    				String id = el.getAttributeValue("id");
    				t.setId(Integer.valueOf(id));
    				//获取子元素文本值
    				String name = el.getChildText("name");
    				t.setName(name);
    				String tel = el.getChildText("tel");
    				t.setTel(tel);
    				listBean.add(t);
    			}  
    		} catch (JDOMException e) {  
    			e.printStackTrace();
    		} catch (IOException e) {  
    			e.printStackTrace();
    		}
    		long xN = System.currentTimeMillis();  
    		System.out.println("解析用时："+(xN-xB)+"毫秒");  
    		System.out.println("------"+listBean.size()); 
    	}
    
    
    }