使用JDOM解析xml

首先要导入第三方jar包：  jdom.jarpackage my.yaner;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.ArrayList;import java.util.Hashtable;import java.util.List;import java.util.Properties;import org.jdom.Document;import org.jdom.Element;import org.jdom.input.SAXBuilder;import org.jdom.output.XMLOutputter;public class Utils {/**解析一个xml文件, 生成JDOM模型*/public static Document loadDOM(InputStream is) throws Exception {SAXBuilder sb = new SAXBuilder();sb.setValidation(false);Document doc = sb.build(is);return doc;}/**解析一个xml文件，生成JDOM模型*/public static Document loadDOM(File file) throws Exception {SAXBuilder sb = new SAXBuilder();sb.setValidation(false);Document doc = sb.build(file);return doc;}/**载入数据1. */public void load(File dir) throws Exception {//载入配置Properties config = new Properties();Document configDoc = loadDOM(new File(dir, "config.xml"));List list = configDoc.getRootElement().getChildren();for(int i = 0; i < list.size(); i++) {if(list.get(i) instanceof Element){Element elem = (Element) list.get(i);String configName = elem.getName();String configValue = elem.getTextTrim();config.setProperty(configName, configValue);}}}/**载入数据2. */public void loadResourceVersions() throws Exception {File baseDir = new File("F:/dbtest");        Document doc = Utils.loadDOM(new File(baseDir, "fileversion.xml"));        List list = doc.getRootElement().getChildren("file");        Hashtable<String, Integer> ret = new Hashtable<String, Integer>();        for (Object obj : list) {            Element elem = (Element)obj;            String fileName = elem.getAttributeValue("path");            int fileVersion = Integer.parseInt(elem.getAttributeValue("version"));            ret.put(fileName, fileVersion);        }    } /** 把一个JDOM模型保存到XML文件中 */ public static void saveDOM(Document doc, File file, boolean addSpace) throws Exception{        FileOutputStream fos = null;        String encoding = System.getProperty("pip_xml_encoding");        if (encoding == null) {        encoding = "GBK";        }        try{            XMLOutputter out;            if (!addSpace) {            // 删除所有无用的空格            ArrayList stack = new ArrayList();            stack.add(doc.getRootElement());            while (stack.size() > 0) {            Object obj = stack.remove(0);            if (obj instanceof Element) {            Element element = (Element)obj;            List list = element.getMixedContent();            for (int i = 0; i < list.size(); i++) {            Object child = list.get(i);            if (child instanceof String && ((String)child).trim().isEmpty()) {            list.remove(i);            i--;            } else if (child instanceof Element) {            stack.add(child);            }            }            }            }            }            out = new XMLOutputter("    ", true, encoding);            fos = new FileOutputStream(file);            BufferedOutputStream bos = new BufferedOutputStream(fos);            out.output(doc, bos);            bos.flush();        }catch(Exception e){            throw e;        }finally{            if(fos != null){                try{                    fos.close();                }catch(IOException e){                }            }        }    }    /** 把一个JDOM模型保存到XML文件中 */    public static void saveDOM(Document doc, OutputStream os) throws Exception{        try{        String encoding = System.getProperty("pip_xml_encoding");            if (encoding == null) {            encoding = "GBK";            }            XMLOutputter out = new XMLOutputter("    ", true, encoding);            BufferedOutputStream bos = new BufferedOutputStream(os);            out.output(doc, bos);            bos.flush();        } catch(Exception e) {            throw e;        }    }}