Parse XML documents using Java

The above is my final running result.

In order to consolidate the learning in the future, we will paste it here for future reference.

1. Library. xml:

 

<? XML version = "1.0" encoding = "gb2312"?>

<Books>

<Book email = "zhangyupeng_good">

<Name> JAVA </Name>

<Price> 100.00 </price>

</Book>

</Books>

2. domparse. java: (write it in Notepad.) import Java. io. fileinputstream; import Java. io. ioexception; import Java. io. inputstream; import javax. XML. parsers. documentbuilder; import javax. XML. parsers. documentbuilderfactory; import javax. XML. parsers. parserconfigurationexception; import Org. w3C. dom. document; import Org. w3C. dom. element; import Org. w3C. dom. node; import Org. w3C. dom. nodelist; import Org. XML. sax. saxexception; Public Class domparse {public domparse () {documentbuilderfactory domfac = documentbuilderfactory. newinstance (); try {documentbuilder dombuilder = domfac. newdocumentbuilder (); inputstream is = new fileinputstream ("D:/zhangxin XML video tutorial/XML example and question/Java parsing XML document/library. XML "); document DOC = dombuilder. parse (is); element root = Doc. getdocumentelement (); nodelist books = root. getchildnodes (); If (books! = NULL) {for (INT I = 0; I <books. getlength (); I ++) {node book = books. item (I); If (book. getnodetype () = node. element_node) {string email = book. getattributes (). getnameditem ("email "). getnodevalue (); system. out. println (email); For (node = book. getfirstchild (); node! = NULL; node = node. getnextsibling () {If (node. getnodetype () = node. element_node) {If (node. getnodename (). equals ("name") {string name = node. getnodevalue (); string name1 = node. getfirstchild (). getnodevalue (); system. out. println (name); system. out. println (name1);} If (node. getnodename (). equals ("price") {string price = node. getfirstchild (). getnodevalue (); system. out. println (price) ;}}}}} catch (parser Configurationexception e) {e. printstacktrace ();} catch (saxexception e) {e. printstacktrace ();} catch (ioexception e) {e. printstacktrace () ;}} public static void main (string ARGs []) {New domparse () ;}} 3. compile: javac domparse. java 4. Run: Java domparse library. XML to see the first result. You will see a null value, which is caused by the following two lines of code: string name = node. getnodevalue (); ---> output null value string name1 = node. getfirstchild (). getnodevalue (); ---------> output Java, that is, the value we need