基于dom4j获取、设置xml文件属性值

Dear 丶 2022-06-11 02:08 208阅读 0赞

# 获取Document对象 #

/** * 获取Document对象 * @param fileName xml位置 * @return String 值 * @throws Exception */ public Document getXMLDocument(String fileName){
        fileName = Constants.CONF_PATH+fileName;
        File file = new File(fileName);
        SAXReader reader = new SAXReader();
        reader.setEncoding("UTF-8");
        Document document = null;
        try {
            document = reader.read(file);
        } catch (DocumentException e) {
            logger.info("解析文件出错！");
        }
        return document;
    }

## 遍历所有节点 ##

//遍历当前节点下的所有节点 public void listNodes(Element node){
        System.out.println("当前节点的名称：" + node.getName());
        //首先获取当前节点的所有属性节点 List<Attribute> list = node.attributes();
        //遍历属性节点 for(Attribute attribute : list){
            System.out.println("属性"+attribute.getName() +":" + attribute.getValue());
        }
        //如果当前节点内容不为空，则输出 if(!(node.getTextTrim().equals(""))){
            System.out.println( node.getName() + "：" + node.getText());
        }
        //同时迭代当前节点下面的所有子节点 //使用递归 Iterator<Element> iterator = node.elementIterator();
        while(iterator.hasNext()){
            Element e = iterator.next();
            listNodes(e);
        }
    }

# 获取节点属性值 #

/** * 根据节点名称获取值 * @param fileName 文件名称 * @param nodeName1 节点1 * @param nodeName2 节点2（可为空） * @return * @throws DocumentException */ public String getNodeValue(String fileName,String nodeName1,String nodeName2) throws DocumentException {
        Document document = getXMLDocument(fileName);
        Element root = document.getRootElement();
        Element node1 = root.element(nodeName1);
        System.out.println(node1.getName()+":"+node1.getText());
        if(StringUtils.isEmptyOrNull(nodeName2)){
            return node1.getText();
        }
        Element node2 = node1.element(nodeName2);
        System.out.println(node2.getName()+":"+node2.getText());
        return node2.getText();
    } 
     /** * 设置节点属性值 * @param fileName 文件名 * @param value 设置的值 * @param nodeName1 节点名 * @param nodeName2 节点名（如没有可赋空） * @throws DocumentException * @throws IOException */ public void setXmlValue(String fileName,String value,String nodeName1,String nodeName2) throws DocumentException, IOException {
        Document document = getXMLDocument(fileName);
        Element root = document.getRootElement();
        Element node1 = root.element(nodeName1);
        System.out.println(node1.getName()+":"+node1.getText());
        if(StringUtils.isEmptyOrNull(nodeName2)){
            node1.setText(value);
            System.out.println("改变后的值为："+node1.getText());
        }else{
            Element node2 = node1.element(nodeName2);
            node2.setText(value);
            System.out.println(node2.getName()+"改变后的值为："+node2.getText());
        }
        writeXml(document,fileName);
    }
    
    /** * 输出xml文件 * * @param document * @param filePath * @throws IOException */ public static void writeXml(Document document, String filePath) throws IOException {
        File xmlFile = new File(filePath);
        XMLWriter writer = null;
        try {
            if (xmlFile.exists())
                xmlFile.delete();
            writer = new XMLWriter(new FileOutputStream(xmlFile), OutputFormat.createPrettyPrint());
            writer.write(document);
            writer.close();
        }  catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (writer != null)
                writer.close();
        }
    } 测试main函数 public static void main(String[] args) throws Exception {
        XmlTools tool = new XmlTools();
        tool.setXmlValue("settings.xml","3","interval","");
    }