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import org.dom4j.*;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.util.*;/** * @Author lyr * @create 2020/6/23 21:47 */public class Main {
       public static final String path = "F:\\妹子1\\testJava2\\xmlJava\\src\\main\\java\\xml\\book.xml";    public static void main(String[] args) {
           try {
               xpathPrint();        } catch (Exception e) {
               e.printStackTrace();        }    }    public static String random() {
           return UUID.randomUUID().toString();    }    public static void printOne()   {
           File file = new File(path);        SAXReader reader=new SAXReader();        //读取xml文件到Document中        Document document= null;        try {
               document = reader.read(file);            System.out.println(document.getRootElement().element("book").asXML());        } catch (DocumentException e) {
               e.printStackTrace();        }    }    private static String template = "
   
    
    \n" +            "
    
    \n" +            "
    
    \n" +            "
    
     %s
    
   ";    /**     * 添加节点     * @throws Exception     */    public static void add() throws Exception{
           // org.dom4j.Document document1 = DocumentHelper.parseText(String.format(template,random(),"读书笔记","tom","100","大学生"));        try {
               File file = new File(path);            SAXReader reader=new SAXReader();            //读取xml文件到Document中            Document document=reader.read(file);            //获取xml文件的根节点            // document.getRootElement().elements("book").forEach(doc->{
               //     System.out.println( ((Element)doc).asXML() );            // });            Document doc = DocumentHelper.parseText(String.format(template,                    random(),                    "好策读书",                    "林老师",                    998,                    "大学生"            ));            System.out.println(document.getRootElement().asXML());            document.getRootElement().elements().add(doc.getRootElement());            // System.out.println(document.getRootElement().asXML());            // r.add(ele);            OutputFormat format = OutputFormat.createPrettyPrint();            XMLWriter writer = new XMLWriter(                    new FileWriter(new File(path)), format);            writer.write(document);            writer.close();        } catch (Exception e) {
               // TODO: handle exception            e.printStackTrace();        }    }    /**     * 删除节点     * @throws DocumentException     */    public static void delete() throws DocumentException {
           File file = new File(path);        SAXReader reader=new SAXReader();        //读取xml文件到Document中        Document document=reader.read(file);        Element e = document.getRootElement().element("book");        e.getParent().remove(e);        System.out.println(document.asXML());        OutputFormat format = OutputFormat.createPrettyPrint();        XMLWriter writer = null;        try {
               writer = new XMLWriter(                    new FileWriter(new File(path)), format);            writer.write(document);        } catch (IOException ioException) {
               ioException.printStackTrace();        }finally {
               try {
                   writer.close();            } catch (IOException ioException) {
                   ioException.printStackTrace();            }        }    }    public static void updateAttr() {
           File file = new File(path);        SAXReader reader=new SAXReader();        //读取xml文件到Document中        Document document= null;        try {
               document = reader.read(file);            Element e = document.getRootElement().element("book");            System.out.println(e.asXML());            e.addAttribute("bookNo",random());            write(document);        } catch (DocumentException e) {
               e.printStackTrace();        }    }    public static void write(Document document) {
           OutputFormat format = OutputFormat.createPrettyPrint();        XMLWriter writer = null;        try {
               writer = new XMLWriter(                    new FileWriter(new File(path)), format);            writer.write(document);        } catch (IOException ioException) {
               ioException.printStackTrace();        }finally {
               try {
                   writer.close();            } catch (IOException ioException) {
                   ioException.printStackTrace();            }        }    }    //遍历xml    public static void printAll() {
           File file = new File(path);        SAXReader reader=new SAXReader();        //读取xml文件到Document中        try {
               Document document = reader.read(file);            List
   
     list = document.getRootElement().elements("book");            for (Iterator it = list.iterator(); it.hasNext();) {
                   Element elm = (Element) it.next();                // do something                System.out.println("node");                System.out.println(elm.asXML());            }        } catch (DocumentException e) {
               e.printStackTrace();        }    }    public static void xpathPrint() {
           SAXReader reader = new SAXReader();        try {
               Document document = reader.read(new File(path));            Map map = new HashMap<>();            map.put("default","http://www.lyr.com/xml");            //设置默认的命名空间，不然找不到            String query = "//default:author";            XPath xpath = document.createXPath(query);            xpath.setNamespaceURIs(map);            // System.out.println(bookShelf.asXML());            xpath.selectNodes(document).forEach(node->{
                   System.out.println(String.format("知名作家: %s",((Node)node).getText()));            });        } catch (DocumentException e) {
               e.printStackTrace();        }    }}
   

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