Dom4j入门 | dom4j

一、Dom4j API生成xml文件

  @Test

    public void bulidXmlByDom4j(){

        //创建document对象

        Document document = DocumentHelper.createDocument();

        //设置xml文档编码

        document.setXMLEncoding("UTF-8");

        //创建root根节点

        Element root = DocumentHelper.createElement("root");

        root.addAttribute("version","1.0");

        //创建head节点

        Element header = DocumentHelper.createElement("header");

        //设置节点的属性

        header.addAttribute("version","1.0");

        //设置子节点 (子节点无属性时，可直接用addElement创建)

        Element element_header1 = header.addElement("timestamp");

        //设置子节点的内容

        element_header1.setText("20190122");

        Element element_header2 = header.addElement("username");

        element_header2.setText("yangsj");

        Element element_header3 = header.addElement("password");

        element_header3.setText("root");

        //创建body节点

        Element body = DocumentHelper.createElement("body");

        body.addAttribute("version","1.0");

        //创建action节点

        Element action = DocumentHelper.createElement("action");

        //创建action的子节点

        Element action_option = DocumentHelper.createElement("option");

        action_option.addAttribute("name","url");

        action_option.addAttribute("value","http://127.0.0.1");

        action.add(action_option);

        //创建data 节点

        Element data = DocumentHelper.createElement("data");

        Element dataField = DocumentHelper.createElement("field");

        dataField.addAttribute("name","money");

        dataField.addAttribute("value","10000");

        data.add(dataField);

        body.add(action);

        body.add(data);

        root.add(header);

        root.add(body);

        document.add(root);

        String xml = document.asXML();

        System.out.println(xml);

    }

　　执行结果

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

<root version="1.0">

    <header version="1.0">

        <timestamp>20190122</timestamp>

        <username>yangsj</username>

        <password>root</password>

    </header>

    <body version="1.0">

        <action>

            <option name="url" value="http://127.0.0.1"/>

        </action>

        <data>

            <field name="money" value="10000"/>

        </data>

    </body>

</root>

二、Dom4j 解析xml

@Test

    public void readXmlInfo() throws DocumentException {

        String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><root version=\"1.0\"><body " +

                "version=\"1.0\"><action><option name=\"url\" value=\"http://127.0.0.1\"/></action><data><field name=\"money\" value=\"10000\"/></data></body><header version=\"1.0\"><timestamp>20190122</timestamp><username>yangsj</username><password>root</password></header></root>";

        Map<String,String> headerMap = new HashMap<>();

        Map<String,String> actionMap = new HashMap<>();

        Map<String,String> dataMap = new HashMap<>();

        Document document = DocumentHelper.parseText(xml);

        // 获取根元素

        Element root = document.getRootElement();

        //遍历根元素

        for (Iterator iter = root.elementIterator(); iter.hasNext();){

            Element element = (Element) iter.next();

            //遍历header节点

            if("header".equalsIgnoreCase(element.getName())){

                for(Iterator i = element.elementIterator(); i.hasNext();){

                    Element headerElement = (Element) i.next();

                    headerMap.put(headerElement.getName(),headerElement.getTextTrim());

                }

            }

            //遍历body节点

            if("body".equalsIgnoreCase(element.getName())){

                for (Iterator j = element.elementIterator(); j.hasNext();){

                    Element bodyElement = (Element) j.next();

                    //遍历action节点

                    if ("action".equalsIgnoreCase(bodyElement.getName())){

                        for (Iterator k = bodyElement.elementIterator(); k.hasNext();){

                            Element actionElement = (Element) k.next();

                            //获取节点的属性值

                            String name = actionElement.attributeValue("name");

                            String value = actionElement.attributeValue("value");

                            actionMap.put(name,value);

                        }

                    }

                    //遍历data节点

                    if ("data".equalsIgnoreCase(bodyElement.getName())){

                        for (Iterator k = bodyElement.elementIterator(); k.hasNext();){

                            Element actionElement = (Element) k.next();

                            //获取节点的属性值

                            String name = actionElement.attributeValue("name");

                            String value = actionElement.attributeValue("value");

                            dataMap.put(name,value);

                        }

                    }

                }

            }

        }

        headerMap.forEach((x,y)->System.out.println("name :" + x + " value :" + y));

        System.out.println("------------------------------------");

        actionMap.forEach((x,y)->System.out.println("name :" + x + " value :" + y));

        System.out.println("------------------------------------");

        dataMap.forEach((x,y)->System.out.println("name :" + x + " value :" + y));

    }

三、执行结果

name :password value :root

name :timestamp value :20190122

name :username value :yangsj

------------------------------------

name :url value :http://127.0.0.1

------------------------------------

name :money value :10000