Parse small demo of XML file with JDOM

JDOM is a unique Java toolkit that uses XML to quickly develop XMLApplicationProgram. Its design includes the syntax and even semantics of the Java language.

Click to download the JDOM jar package

I made a Java project example to introduce the file structure first:

My XML document is placed under the src directory. The specific content is as follows:

 

 
<? XML version = "1.0" encoding = "UTF-8"?> <Root> <person id = "1"> <username> ydcun </username> <password> 123123 </password> </person> <person id = "2"> <username> 1111111112 </username> <password> password2 </password> </person> </root>
 

The following describes how to use JDOM to operate XML files. I only wrote examples of traversing, deleting, and adding nodes:

 

 

Package COM. ydcun. test; import Java. io. fileinputstream; import Java. io. filenotfoundexception; import Java. io. fileoutputstream; import Java. io. ioexception; import Java. io. inputstream; import Java. util. list; import Org. JDOM. document; import Org. JDOM. element; import Org. JDOM. jdomexception; import Org. JDOM. input. saxbuilder; import Org. JDOM. output. xmloutputter; public class testdemo {Private Static document; // stores the Read File Private Static string Path = "src/struts. XML "; // file storage path // Load file public testdemo () throws exception {saxbuilder bulider = new saxbuilder (); inputstream inst = new fileinputstream (PATH); document = bulider. build (insT);} // traverse the parsing document public void xmlparse () {element root = document. getrootelement (); // obtain the Root Node object list <element> List = root. getchildren (); For (element El: List) {system. out. println ("ID =" + el. getattributevalue ("ID"); system. out. println ("name:" + el. getchildtext ("username"); system. out. println ("Password:" + el. getchildtext ("password") ;}// Add the public void addelement () throws exception {// create a person node element El = new element ("person "); el. setattribute ("ID", "3"); // create the username node element elname = new element ("username"); elname. settext ("Qiqi"); // create the password node element elpassword = new element ("password"); elpassword. settext ("123456"); // Add username and password to El. addcontent (elname); El. addcontent (elpassword); // get the root node to add the person node to the root node element root = document. getrootelement (); root. addcontent (EL); document. setrootelement (Root); // Save the added content to the file xmloutputter out = new xmloutputter (); out. output (document, new fileoutputstream (PATH);} // Delete the public void deleteelement (int id) throws exception {element root = document. getrootelement (); List <element> List = root. getchildren (); For (element El: List) {If (El. getattributevalue ("ID "). equals (ID + "") {root. removecontent (EL); // Delete the qualified node} xmloutputter out = new xmloutputter (); out. output (document, new fileoutputstream (PATH);} public static void main (string [] ARGs) throws exception {testdemo TD = new testdemo (); // TD. addelement (); // Add a node // TD. xmlparse (); // convenience XML file TD. deleteelement (3); // delete node }}

Through the above operations, we can easily master the XML file operations!