java利用dom4j来操作xml文件
使用dom4j操作xml文件可以参考dom4j的api文档。1、parsing XML 解析xml文件
SAXReader reader = new SAXReader();File file =new File("xx.xml");Document document = reader.read(file);2、获取根元素
Element root = document.getRootElement();3、获取所有的元素、获取某个特定的元素、获取根元素的属性
// iterate through child elements of root for ( Iterator i = root.elementIterator(); i.hasNext(); ) { Element element = (Element) i.next(); // do something } // iterate through child elements of root with element name "foo" for ( Iterator i = root.elementIterator( "foo" ); i.hasNext(); ) { Element foo = (Element) i.next(); // do something } // iterate through attributes of root for ( Iterator i = root.attributeIterator(); i.hasNext(); ) { Attribute attribute = (Attribute) i.next(); // do something } 4、将document写入文件
//prepare an output format,which has new line .打印（显示）出来有格式OutputFormat format = OutputFormat.createPrettyPrint();format.setIndentSize(4);//OutputStream os = new FileOutputStream(fileName);//output stream ( where to output )and format (how to output)XMLWriter writer = new XMLWriter(os,format);//output content( what to be output)---documentwriter.write(document);writer.close();
使用例子
1、在xml文件中增加element
步骤：1、open the document and get the rootDocument;
2、construct an element ;
3、append the newly element to the root element;
4、update the count of the root element;此处是更新根元素的count属性，如果没有这个属性则不需要更新，count属性存储element 的个数。
5、save the document into the file.
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