[Java-XML] Parse XML strings using JDOM (non-XML document)

Package CMO. shubai. JDOM;

Import java. Io. ioexception;
Import java. Io. stringreader;
Import java. util. List;

Import org. JDOM. Document;
Import org. JDOM. element;
Import org. JDOM. jdomexception;
Import org. JDOM. namespace;
Import org. JDOM. Input. saxbuilder;
Import org. xml. Sax. inputsource;

Public class duxmldoc {
Public list xmlelements (string xmldoc ){
// Create a new string
Stringreader READ = new stringreader (xmldoc );
// Create a new input source. The SAX Parser uses the inputsource object to determine how to read the XML input.
Inputsource source = new inputsource (read );
// Create a new saxbuilder
Saxbuilder sb = new saxbuilder ();
Try {
// Construct a document using the input source
Document Doc = sb. Build (source );
// Obtain the root element.
Element root = Doc. getrootelement ();
System. Out. println (root. getname (); // name of the output root element (test)
// Obtain the set of all child elements of the root element.
List jiedian = root. getchildren ();
// Obtain the namespace in XML (The namespace is not defined in XML and can not be written)
Namespace NS = root. getnamespace ();
Element ET = NULL;
For (INT I = 0; I et = (element) jiedian. Get (I); // The subelement is obtained in a loop.
/**//*
* When no namespace is defined
* Et. getchild ("users_id"). gettext ();
* Et. getchild ("users_address", NS). gettext ()
*/
System. Out. println (ET. getchild ("users_id", NS). gettext ());
System. Out. println (ET. getchild ("users_address", NS). gettext ());
}
/**//*
* For the name of the child element to be removed
*/
ET = (element) jiedian. Get (0 );
List zjiedian = ET. getchildren ();
For (Int J = 0; j element xet = (element) zjiedian. Get (j );
System. Out. println (xet. getname ());
}
} Catch (jdomexception e ){
// Todo automatically generates catch Blocks
E. printstacktrace ();
} Catch (ioexception e ){
// Todo automatically generates catch Blocks
E. printstacktrace ();
}
Return NULL;
}
Public static void main (string [] ARGs ){
Duxmldoc Doc = new duxmldoc ();
String xml = "" +
"+
"+
"1001" +
"Wangwei" +
"80" +
"1001" +
"+
"+
"1002" +
"Wangwei" +
"80" +
"1002" +
"+
"";
Doc. xmlelements (XML );
}
}

The preceding example is slightly different from the actual one-this example is mainly used to demonstrate how JDOM parses XML strings.

JDOM processes XML files with namespace

Recently encountered some problems in XML file reading during development-JDOM Technology reading
1
2
3
4 1001
5 wangwei
6 80
1001
8
9
10 1002
11 wangwei
12 80
13 1002
14
15
16 1003
17 wangwei
18 80
19, 1003
20
21
22 1004
23 wangwei
24 80
25, 1004
26
27

CodeXmlns = "http://www.fiorano.com/fesb/activity/dbqueryoninput2/out”>
It is the namespace of the XML file. when reading the element value of this document, you must specify its namespace. Otherwise, a null pointer exception occurs in Java. Lang. nullpointerexception.
Actually executed code

Public class duxmltest2 {
Public void loadxmldoc (){
Fileinputstream Fi = NULL;
Try {
FI = new fileinputstream ("test. xml ");
Saxbuilder sb = new saxbuilder ();
Try {
Document Doc = sb. Build (FI );
Element root = Doc. getrootelement ();
Namespace NS = root. getnamespace ();
List jiedian = root. getchildren ();
Element ET = NULL;
For (INT I = 0; I et = (element) jiedian. Get (I );
System. Out. println (ET. getchild ("users_id", NS). gettext ());
}
} Catch (jdomexception e ){
// Todo automatically generates catch Blocks
E. printstacktrace ();
} Catch (ioexception e ){
// Todo automatically generates catch Blocks
E. printstacktrace ();
}
} Catch (filenotfoundexception e ){
// Todo automatically generates catch Blocks
E. printstacktrace ();
}
}
Public static void main (string [] ARGs ){
Duxmltest2 dt = new duxmltest2 ();
DT. loadxmldoc ();
}