日期:2014-3-18 浏览次数:20437次

  在任务中使用 XML 曾经很长时间了,不过长久以来都是进行的读操作,或者在生成 XML 时完全使用 StringBuffer 来结构。进行完整的读取、添加、删除、修正还是最近的事情。在这里我采用的是 DOM4J,其实呢这些内容都很简单,如果情愿,各位大可直接参考官方的 Cookbook(http://www.dom4j.org/cookbook.html)和 Quick Start(http://www.dom4j.org/guide.html)。
  
对于给定的 XML 文件,其结构如下:
<?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>

  为以上 XML 文件结构 Propertys 类:

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;
}
}

读取方法(前往包含 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;
}

添加新节点(成功前往 1 否则 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;
}

更新节点(按照 name 属性查找):
  

 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.createPrettyPrin