Java 实现XML文件解析

public class ParseXML
{
    
    public static void main(String args[])
    {
        try
        {
            //获取到配置文件
            String configFileName = "src/example.xml";
            File f = new File(configFileName);
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder db;
            db = factory.newDocumentBuilder();
            Document documents;
            //将配置文件解析进来
            documents = db.parse(f);
            
[color=green]            //按照bean标签读取参数
            NodeList nl = documents.getElementsByTagName("bean");
            
           for (int i = 0; i < nl.getLength(); i++)
            {
                if (documents.getElementsByTagName("id").item(i) != null)
                {
                    System.out.println(documents.getElementsByTagName("id").item(i).getFirstChild().getNodeValue());
                }
                
            }[/color]            
            //获取配置文件参数
            Element rootElement = documents.getDocumentElement();
            NodeList children = rootElement.getChildNodes();
            int childSize = children.getLength();
            
            for (int i = 0; i < childSize; i++)
            {
                Node childNode = children.item(i);
                
                if (childNode instanceof Element)
                {
                    Element child = (Element)childNode;
                    
                    final String nodeName = child.getNodeName();
                    
                    if ("bean".equals(nodeName))
                    {
                        String firstCondition = child.getAttribute("firstCondition");
                        String className = child.getAttribute("class");
                        String serviceId = child.getAttribute("id");
                    }
                }
            }
        }
        
        catch (ParserConfigurationException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        catch (SAXException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

这里提供的方法可以解析两种格式的XML文件：

<?xml version="1.0" encoding="UTF-8" ?>

<struts>
    <bean serviceId="testExample" firstCondition="Pudge" class="com.kewen.123456" />
    <bean serviceId="ZXC" firstCondition="NeverMore" class="com.kewen.123456" />

</struts>

另一种：

<bean>
	<serviceId>1234</serviceId>
	<firstCondition>puck</firstCondition>
	<class>com.kewen.kkkk</class>
</bean>

绿色java代码用于解析第二种xml格式。