Dom4j漫笔

Dom4j随笔

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<!--[if !supportLists]-->1、?<!--[endif]-->读取XML文件，获得document对象

SAXReader??? reader=new?SAXReader();

Document??? document=reader.read(new? File(“Input.xml”));

String text = "<members></members>";
Document document = DocumentHelper.parseText(text);

Documentdocument = DocumentHelper.createDocument();
//创建根节点

Element root = document.addElement("members");

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE books[    <!ELEMENT books (book*)>    <!ELEMENT book (name,author,price)>    <!ELEMENT name (#PCDATA)>    <!ELEMENT author (#PCDATA)>    <!ELEMENT price (#PCDATA)>    <!ATTLIST author address CDATA #IMPLIED>]> <books>   <book>       <name>Java开发</name>       <author>m_j1</author>       <price>10000</price>   </book>     <book>       <name>Java开发</name>       <author>m_j2</author>       <price>10000</price>   </book>     <book>       <name>Java开发</name>       <author>m_j3</author>       <price>10000</price>   </book>     <book>       <name>Java开发1</name>       <author address="保定 何软 宿舍3号">m_j1</author>       <price>10000</price>   </book>    </books>

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解析元素第一种方法

    public static void parse(Element root) {       parseAttr(root);       List<Element> list = root.elements();       for (Element entity : list) {           // 判断节点类型是否带有文本类型、           if (entity.isTextOnly()) {              parseAttr(entity);              System.out.println(entity.getName());           } else {              parse(entity);           }       }    }

    public static void parse(Element root) {       for (Iterator<Element> it = root.elementIterator(); it.hasNext();) {           Element entity = it.next();           if (entity.isTextOnly()) {              parseAttr(entity);              System.out.println(entity.getText());           } else {              parse(entity);           }       }    }

??? private static void parseAttr(Element root) {

       List<Attribute> attrs = root.attributes();       System.out.println(attrs.size());       for (Attribute entity : attrs) {           System.out.println(entity.getName() + "-----" + entity.getValue());       }    }

// 解析属性    private static void parseAttr(Element root) {for (Iterator<Attribute> it = root.attributeIterator(); it.hasNext();) {           Attribute entity = it.next();           System.out.println(entity.getName() + "--------"                  + entity.getValue());       }    } 

// 利用的demo4J创建XML文档    public static void main(String[] args)throws Exception {       // 创建document对象两种方法   第一种       Document doc = DocumentHelper.createDocument();        /*第二种        * DocumentFactory df=new DocumentFactory(); Document        * doc1=df.createDocument();        */       Element root = doc.addElement("books");       // 添加四个元素       Element book = root.addElement("book");       book.addAttribute("isbn", "1001");       Element name = book.addElement("name");       name.setText("java编程");       Element author = book.addElement("author");       author.setText("aa");       Element price = book.addElement("price");       price.setText("000");       //设置乱码       OutputFormat format = new OutputFormat("      ",true,"gb2312");         XMLWriter xm=new XMLWriter(new FileWriter("src\\bk.xml"),format);        xm.write(doc);        xm.close();    }

修改步骤：?1、解析xml文档，将xml文档转换Dom4j树

2、利用dom4j树提供的导航方法找到需要修改的节点

3、修改指定的节点,或者在指定的节点添加新的节点

4、写入到dom4j树document中,写入修改后的xml文件中

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public static void main(String[] args) throws Exception{    SAXReader reader=new  SAXReader();    //忽略空白    reader.setStripWhitespaceText(true);    Document doc=reader.read(new File("src\\bk.xml"));    //获取根元素    Element root=doc.getRootElement();       //在第二个book中的auther后添加address元素    Element book2=(Element) root.elements("book").get(1);    List list=book2.elements();    Element address=DocumentHelper.createElement("address");    address.setText("保定");    list.add(2,address);    /*在第一个book中的name之前添加address元素     * Element address=DocumentHelper.createElement("address");    List list= root.element("book").elements();    address.setText("保定");    list.add(0, address);*/ //  Element address  =    root.element("book").element("author").addElement("address");    OutputFormat format = new OutputFormat("      ",true,"gb2312");       XMLWriter xw = new XMLWriter(new FileWriter("src\\bk.xml"),format);       xw.write(doc);       xw.close();} 

public static void main(String[] args) throws Exception {       SAXReader reader = new SAXReader();       // 忽略空白       reader.setStripWhitespaceText(true);       Document doc = reader.read(new File("src\\bk.xml"));       // 获取根元素       Element root = doc.getRootElement();       Element book2 = (Element) root.elements("book").get(0);       Element address = book2.element("address");       book2.remove(address);        OutputFormat format = new OutputFormat("     ", true, "gb2312");        XMLWriter xw = new XMLWriter(new FileWriter("src\\bk.xml"), format);        xw.write(doc);       xw.close();    }