Java method for reading XML files

I. Java class

1. PackageCom. java. test;
2.  
3. ImportOrg. W3C. Dom .*;
4. ImportJavax. xml. parsers .*;
5. ImportJava. Io .*;
6.  
7. Public ClassJavareadxml {
8. // Document can be seen as an image of XML in memory. Once this document is obtained
    
9. // Memory operations to perform XML operations. First, obtain the XML-related document
    
10. PrivateDocument Doc =Null;
11.  
12. Public VoidInit (string xmlfile)ThrowsException {
    
13. // It is obvious that this class is a singleton. Obtain and generate the documentbuilder factory first.
     
14. // The factory where a documentbuilder is generated,
     
15. // Documentbuilder is used to generate document
     
16. Documentbuilderfactory DBF = documentbuilderfactory. newinstance ();
17. Documentbuilder DB = DBF. newdocumentbuilder ();
18. // This document is an image of the XML file in the memory.
     
19. Doc = dB. parse (NewFile (xmlfile ));
20. }
21.  
22. // This method is used to display the content of the XML file.
     
23. Public VoidViewxml (string xmlfile)ThrowsException {
    
24. This. INIT (xmlfile );
25. // There is only one root element in the XML file. Take the root element out first.
     
26. Element element = Doc. getdocumentelement ();
27. System. Out. println ("root element:" + element. gettagname ());
28.  
29. Nodelist = Doc. getelementsbytagname ("person ");
30. System. Out. println ("book node chain length:" + nodelist. getlength ());
31.  
32. Node fathernode = nodelist. Item (0 );
33. System. Out. println ("parent node:" + fathernode. getnodename ());
34.  
35. // Take out the attributes of the parent node
     
36. Namednodemap attributes = fathernode. getattributes ();
37.  
38. For(IntI = 0; I <attributes. getlength (); I ++ ){
    
39. Node attribute = attributes. item (I );
40. System. Out. println ("book attribute name:" + attribute. getnodename ()
41. + "The corresponding property value is:" + attribute. getnodevalue ());
42. }
43.  
44. Nodelist childnodes = fathernode. getchildnodes ();
45. System. Out. println (childnodes. getlength ());
46. For(IntJ = 0; j <childnodes. getlength (); j ++ ){
    
47. Node childnode = childnodes. Item (j );
48. // If the node belongs to the element, set the value.
     
49. If(ChildnodeInstanceofElement ){
50. // System. Out. println ("sub-node name:" + childnode. getnodename () + "the corresponding value is" + childnode. getfirstchild (). getnodevalue ());
     
51. System. Out. println ("subnode name:" + childnode. getnodename ()
52. + "The corresponding value is" + childnode. getfirstchild (). getnodevalue ());
53. }
54. }
55.  
56. }
57.  
58. Public Static VoidMain (string [] ARGs)ThrowsException {
    
59. Javareadxml parse =NewJavareadxml ();
60.  
61. // My XML file
     
62. Parse. viewxml ("person. xml ");
63. }
64. }

Ii. xml file

 
 

  
  
<? XML version = "1.0" encoding = "UTF-8"?>
  
  
<Book>
  
  
<Person>
  
  
<First> Wang </first>
  
  
<Last> laohu </last>
  
  
<Age> 25 </age>
  
  
<Version> China Post and Telecommunications Publishing House </version>
  
  
</Person>
  
  
<Person>
  
  
<First> LI </first>
  
  
<Last> junjia </last>
  
  
<Age> 24 </age>
  
  
<Version> Tsinghua University Press </version>
  
  
</Person>
  
  
</Book>
 
 

Iii. output results

The root element is book.
The length of the book node chain: 2
Parent node: person
9
Subnode name: the value corresponding to first is Wang
Child node name: the value corresponding to last is laohu
Subnode name: the value corresponding to age is 25.
Sub-node name: the value corresponding to version is China Post and Telecommunications Press
Source: http://developer.51cto.com/art/200906/128418.htm