Java learns forty-three (DOM4j parses XML) and dom4jxml from scratch

Java learns forty-three (DOM4j parses XML) and dom4jxml from scratch
1. Create XML

// Create XML public static void gernatorXML () {// create Document Object Document doc = incluenthelper. createDocument (); // create the root node students Element studentsElement = doc. addElement ("students"); // create a subnode student Element studentElement1 = studentsElement. addElement ("student"); // Add the ID attribute studentelement1.addattriement ("id", "1001"); // Add the subnode studentElement1.addElement ("name "). setText ("Zhang San"); studentElement1.addElement ("age "). setText ("18"); studentElement1.addElement ("sex "). setText ("male"); studentElement1.addElement ("phone "). setText ("13800138000"); studentElement1.addElement ("address "). setText ("Shenzhen Baoan"); // create the same two student nodes Element studentElement2 = studentsElement. addElement ("student"); // Add the ID attribute studentelement2.addattriement ("id", "10012"); // Add the subnode studentElement2.addElement ("name "). setText ("Li Si"); studentElement2.addElement ("age "). setText ("19"); studentElement2.addElement ("sex "). setText ("female"); studentElement2.addElement ("phone "). setText ("13412369854"); studentElement2.addElement ("address "). setText ("Shanghai"); // create the same two student nodes Element studentElement3 = studentsElement. addElement ("student"); // Add the ID attribute studentelement3.addattriement ("id", "10013"); // Add the subnode studentElement3.addElement ("name "). setText ("Wang Wu"); studentElement3.addElement ("age "). setText ("25"); studentElement3.addElement ("sex "). setText ("female"); studentElement3.addElement ("phone "). setText ("13410110104"); studentElement3.addElement ("address "). setText ("Guangdong"); try {// create XML to write the Document into XML // set the format OutputFormat format = OutputFormat. createPrettyPrint (); // you can set the character encoding to gb2312 or gbk format. setEncoding ("UTF-8"); // enter XMLWriter writer = new XMLWriter (new FileWriter ("xml/students. xml "), format); // write the document writer. write (doc); // close the stream writer. close (); // The output prompts System. out. println ("======= successful write ======");} catch (IOException e) {// TODO Auto-generated catch block e. printStackTrace ();}}

 

Ii. parsing XML

// Read XML public static void getXML () {try {// read XML SAXReader reader = new SAXReader (); Document doc = reader. read ("xml/students. xml "); // get the root node Element root = doc. getRootElement (); // obtain the List of child nodes <Element> stulList = root. elements (); // traverse for (Element ele: stulList) {// obtain the attribute String id = ele. attributeValue ("id"); System. out. println ("student ID:" + id); // obtain the text content name String name = ele. elementText ("name"); // age String age = ele. elementText ("age"); // sex String sex = ele. elementTextTrim ("sex"); // phone String phone = ele. elementTextTrim ("phone"); // address String address = ele. elementTextTrim ("address"); System. out. println ("name:" + name + "\ t age:" + age + "\ t Gender:" + sex + "\ t tel: "+ phone +" \ t address: "+ address) ;}} catch (incluentexception e) {e. printStackTrace ();}}

 

3. Add nodes

// Add a new public static void addXML () {try {// read the XML creation parser SAXReader reader = new SAXReader (); // create the Document Object Document doc = reader. read ("xml/students. xml "); // get the root node Element root = doc. getRootElement (); // create a new node Element student = root. addElement ("student"); // Add the property student. addAttribute ("id", "10020"); // create a subnode student. addElement ("name "). setText ("Zhang Sanfeng"); student. addElement ("age "). setText ("108"); student. addElement ("sex "). setText ("male"); student. addElement ("phone "). setText ("13800138001"); student. addElement ("address "). setText ("Wudang Mountains"); // write XML // set the character encoding and format OutputFormat format = new OutputFormat (); format. setEncoding ("UTF-8"); // create the output stream XMLWriter writer = new XMLWriter (new FileWriter ("xml/students. xml "), format); // write to Document writer. write (doc); // close the stream writer. close (); // The System prompt is displayed. out. println ("======== added successfully ======");} catch (entexception e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace ();}}

 

4. Modify nodes

// Modify the node content. Based on id10013, set Wang Wu's name to Wang Xiaowei, age 30, Gender: male, tel: 138000138000, address: Beijing public static void modify () {try {// create SAXReader parser SAXReader reader = new SAXReader (); // create Document doc = reader. read ("xml/students. xml "); // find the root node Element root = doc. getRootElement (); // List of subnode sets <Element> studentList = root. elements (); // traverse the search for (Element ele: studentList) {if (ele. attributeValue ("id "). equals ("10013") {ele. element ("name "). setText ("Wang xiaowu"); ele. element ("age "). setText ("30"); ele. element ("sex "). setText ("male"); ele. element ("phone "). setText ("138000138000"); ele. element ("address "). setText ("Beijing") ;}/// write XML // set the character format and encoding OutputFormat format = new OutputFormat (); format. setEncoding ("UTF-8"); XMLWriter writer = new XMLWriter (new FileWriter ("xml/students. xml "), format); // write the Document to writer. write (doc); // close the stream writer. close (); // The System prompt is displayed. out. println ("==== modified successfully ====");} catch (incluentexception e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace ();}}

 

5. delete node XML

/Delete the node to delete the public static void delete () {try {// create the SAXReader parser SAXReader reader = new SAXReader (); // create the Document Object Document doc = reader. read ("xml/students. xml "); // get the root node Element root = doc. getRootElement (); // set List <Element> stuList = root. elements (); // traverse for (Element ele: stuList) {if (ele. attributeValue ("id "). equals ("10013") {// obtain the parent node and delete it. getParent (). remove (ele) ;}/// write XML // set the character encoding format OutputFormat format = new OutputFormat (); format. setEncoding ("UTF-8"); // output stream XMLWriter writer = new XMLWriter (new FileWriter ("xml/students. xml "), format); writer. write (doc); writer. close (); System. out. println ("=== deleted successfully ===");} catch (deleentexception e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace ();}}