成都心情

    在工作中使用 XML 已經很長時間了，不過長久以來都是進行的讀操作，或者在生成 XML 時完全使用 StringBuffer 來構造。進行完整的讀取、添加、刪除、修改還是最近的事情。在這里我采用的是 DOM4J，其實呢這些內容都很簡單，如果愿意，各位大可直接參考官方的 Cookbook（http://www.dom4j.org/cookbook.html）和 Quick Start（http://www.dom4j.org/guide.html）。
   
對于給定的 XML 文件，其結構如下：

<?xml version="1.0" encoding="GBK" ?> <propertysets>  <propertset name="rea_faculty" description="team">   <field>10290</field>  </propertset>  <propertset name="faculty_lea" description="another team">   <field>10286</field>  </propertset>  <propertset name="office" description="teams">   <field>10287</field>  </propertset>   </propertysets>

    
為以上 XML 文件構造 Propertys 類：

public class Propertys {    private String name;  private String description;  private String field;  public String getDescription() {   return description;  }  public void setDescription(String description) {   this.description = description;  }  public String getField() {   return field;  }  public void setField(String field) {   this.field = field;  }  public String getName() {   return name;  }  public void setName(String name) {   this.name = name;  } }

讀取方法（返回包含 Propertys 的列表）：
   

public List getAll() {   List list = new ArrayList();   try {    InputStream is = getClass().getResourceAsStream("/navigation.xml");    SAXReader reader = new SAXReader();          Document document = reader.read(is);    Element root = document.getRootElement();    Iterator lv = root.elementIterator("propertset");    Element el = null;    while (lv.hasNext()) {     Propertys property=new Propertys();     el = (Element) lv.next();     property.setName(el.attributeValue("name"));     property.setDescription(el.attributeValue("description"));     property.setField(el.elementText("field"));     list.add(property);    }   } catch (Exception e) {    e.printStackTrace();   }   return list;  }

添加新節點（成功返回 1 否則 0）：
       

public int saveProperty(Propertys property) {   try {    InputStream is = getClass().getResourceAsStream("/navigation.xml");    SAXReader reader = new SAXReader();          Document document = reader.read(is);    Element root = document.getRootElement();    root.addElement("propertset")     .addAttribute("name",property.getName())     .addAttribute("description",property.getDescription())     .addElement("field").addText(property.getField());        OutputFormat outformat = OutputFormat.createPrettyPrint();    outformat.setEncoding("GBK");    FileWriter out = new FileWriter(      System.getProperty("user.dir")      +"/web/WEB-INF/classes/navigation.xml");    XMLWriter writer=new XMLWriter(out,outformat);    writer.write(document);    writer.close();    return 1;   } catch (Exception e) {    e.printStackTrace();   }   return 0;  }

更新節點（按照 name 屬性查找）：
   

public int updateProperty(String pro,Propertys property) {   try {    InputStream is = getClass().getResourceAsStream("/navigation.xml");    SAXReader reader = new SAXReader();          Document document = reader.read(is);    Element root = document.getRootElement();    Iterator lv = root.elementIterator("propertset");    Element el = null;    while (lv.hasNext()) {     el = (Element) lv.next();     if (el.attributeValue("name").equals(pro)) {      el.setAttributeValue("name",property.getName());      el.setAttributeValue("description",property.getDescription());      el.element("field").setText(property.getField());     }    }    OutputFormat outformat = OutputFormat.createPrettyPrint();    outformat.setEncoding("GBK");    FileWriter out = new FileWriter(      System.getProperty("user.dir")      +"/web/WEB-INF/classes/navigation.xml");    XMLWriter writer=new XMLWriter(out,outformat);    writer.write(document);    writer.close();    return 1;   } catch (Exception e) {    e.printStackTrace();   }   return 0;  }

刪除節點：
   

public int delProperty(String pro) {   try {    InputStream is = getClass().getResourceAsStream("/navigation.xml");    SAXReader reader = new SAXReader();          Document document = reader.read(is);    Element root = document.getRootElement();    Iterator lv = root.elementIterator("propertset");    Element el = null;    while (lv.hasNext()) {     el = (Element) lv.next();     if (el.attributeValue("name").equals(pro)) {      el.detach();     }    }    OutputFormat outformat = OutputFormat.createPrettyPrint();    outformat.setEncoding("GBK");    FileWriter out = new FileWriter(      System.getProperty("user.dir")      +"/web/WEB-INF/classes/navigation.xml");    XMLWriter writer=new XMLWriter(out,outformat);    writer.write(document);    writer.close();    return 1;   } catch (Exception e) {    e.printStackTrace();   }   return 0;  }

請注意！引用、轉貼本文應注明原作者：Rosen Jiang 以及出處：http://www.aygfsteel.com/rosen