dom4j操作xml

 public static void main(String args[]) {try {    SAXReader reader = new SAXReader();    Document document = reader.read(new File("d:\\aa.xml"));    Element el = document.getRootElement();        //得到service节点    Iterator iterator = el.elementIterator("service");    Element sel = (Element) iterator.next();    //得到service节点下面的所有节点     //为了判断service节点下面有没有value,title等其他节点    //如果已经有了就删除了 重新添加 没有的话 就直接添加    Iterator iter = sel.elementIterator();    //遍历service下的所有节点    while(iter.hasNext()){Element el2 = (Element)iter.next();//如果有value节点 删除它if(el2.getName() == "value"){    sel.remove(el2);}//如果有title节点 删除它if(el2.getName() == "title"){    sel.remove(el2);}    }    //在service节点下创建value节点    Element value = sel.addElement("value");    //给value节点赋值    value.setText("laop");    //在service节点下创建title节点    Element title = sel.addElement("title");    //给title节点赋值    title.setText("老婆");        //把生成好的xml写入地址    //美化格式    OutputFormat format = OutputFormat.createPrettyPrint();      XMLWriter writer = new XMLWriter(new FileWriter(new File("d:\\aa.xml")),format);    writer.write(document);    writer.close();} catch (Exception e) {}    }

XML文件

<?xml version="1.0" encoding="UTF-8"?><books>   <service>     <value>laop</value>    <title>老婆</title>  </service>    <ss>ssssss</ss> </books>

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Iterator iterator = el.elementIterator("action");while (iterator.hasNext()) {Element sel = (Element) iterator.next();Iterator iter = sel.elementIterator();while (iter.hasNext()) {Element el2 = (Element) iter.next();Iterator iter3 = el2.elementIterator();while (iter3.hasNext()) {Element el3 = (Element) iter3.next();//这个方法可以System.out.println(el3.getText());//下面这个不行System.out.println(el3.elementText("function"));}}}