Dom4j reads, writes, modifies, and formats XML

Package Dom;

Import java. Io. file;
Import java. Io. fileoutputstream;
Import java. Io. filewriter;
Import java. util. iterator;
Import java. util. List;

Import org. dom4j. Attribute;
Import org. dom4j. Document;
Import org. dom4j. documenthelper;
Import org. dom4j. element;
Import org. dom4j. Io. outputformat;
Import org. dom4j. Io. saxreader;
Import org. dom4j. Io. xmlwriter;

Import dom4jpackage. bdom4j;

/* Including reading, writing, modifying, and formatting XML by dom4j */

Public class dom4j {

Private void readxmlfile (string infile) throws exception {// read the XML file
Try {

File F = new file (infile );

Saxreader reader = new saxreader ();

Document Doc = reader. Read (f );

Element root = Doc. getrootelement ();

Element Foo;

For (iterator I = root. elementiterator ("datarow"); I. hasnext ();)

{Foo = (element) I. Next ();
/* System. Out. println ("name:" + Foo. elementtext ("name "));
System. Out. println ("Age:" + Foo. elementtext ("Age "));
System. Out. println ("Tel:" + Foo. elementtext ("tel "));
System. Out. println ("Gender:" + Foo. attributevalue ("gender "));*/

List list = (list) Foo. Elements ();
Iterator J = List. iterator ();
Int A = 1;
While (J. hasnext ())
{Element foo1 = (element) J. Next ();
// If (! = 1)
System. Out. println (foo1.gettext ());
// A ++;
}
/* While (J. hasnext ())
{Element foo1 = (element) J. Next ();
List list1 = (list) foo1.elements ();
Iterator J1 = list1.iterator ();
While (j1.hasnext ()){
Element foo11 = (element) j1.next ();
System. Out. println (foo11.gettext ());
}*/


}

} Catch (exception e ){

E. printstacktrace ();

}

}

Private void writexmlfile (string OUTFILE) throws exception {// write an XML file

}

// Create an XML document
Public int createxmlfile (string filename ){
/** Operation result returned. Table 0 failed, Table 1 succeeded */
Int returnvalue = 0;
/** Create a document object */
Document document = incluenthelper. createdocument ();
/** Create the root books of the XML document */
Element bookselement = Document. addelement ("books ");
/** Add a line of comment */
Bookselement. addcomment ("this is a test for dom4j, lx, 2008.12.11 ");
/** Add the first book node */
Element bookelement = bookselement. addelement ("book ");
/** Add the show attribute content */
Bookelement. addattribute ("show", "yes ");
/** Add a title node */
Element titleelement = bookelement. addelement ("title ");
/** Set content for title */
Titleelement. settext ("dom4j tutorials ");

/** Two books after similar completion */
Bookelement = bookselement. addelement ("book ");
Bookelement. addattribute ("show", "yes ");
Titleelement = bookelement. addelement ("title ");
Titleelement. settext ("Lucene studing ");
Bookelement = bookselement. addelement ("book ");
Bookelement. addattribute ("show", "no ");
Titleelement = bookelement. addelement ("title ");
Titleelement. settext ("Lucene in action ");

/** Add an owner node */
Element ownerelement = bookselement. addelement ("owner ");
Ownerelement. settext ("Liu X ");

Try {
/** Write the content in the document to the file */
Xmlwriter writer = new xmlwriter (New filewriter (new file (filename )));
Writer. Write (document );
Writer. Close ();
/** If the execution is successful, 1 is returned */
Returnvalue = 1;
} Catch (exception ex ){
Ex. printstacktrace ();
}

Return returnvalue;
}

/**
* Format XML documents and solve Chinese problems
*
* @ Param filename
* @ Return
*/
Public int formatxmlfile (string filename ){
Int returnvalue = 0;
Try {
Saxreader = new saxreader ();
Document document = saxreader. Read (new file (filename ));
Xmlwriter writer = NULL;
/** Format the output, with the same type as IE browsing */
Outputformat format = outputformat. createprettyprint ();
/** Specify XML encoding */
Format. setencoding ("GBK ");
Writer = new xmlwriter (New filewriter (new file (filename), format );
Writer. Write (document );
Writer. Close ();
/** If the execution is successful, 1 is returned */
Returnvalue = 1;
} Catch (exception ex ){
Ex. printstacktrace ();
}
Return returnvalue;
}

/**
* Modify the content in the XML file and save it as a new file. Master how to add, modify, and delete nodes in dom4j.
*
* @ Param filename
* Modifying object files
* @ Param newfilename
* Save the modification as a file.
* @ Return returns the operation result. Table 0 fails and table 1 is successful.
*/
Public int modixmlfile (string filename, string newfilename ){
Int returnvalue = 0;
Try {
Saxreader = new saxreader ();
Document document = saxreader. Read (new file (filename ));
/**
* One of the changes: if the show attribute in the book node is set to yes, It is changed to No.
*/
/** Search for objects using XPath first */
List list = Document. selectnodes ("/books/book/@ show ");
Iterator iter = List. iterator ();
While (ITER. hasnext ()){
Attribute attribute = (attribute) ITER. Next ();
If (attribute. getvalue (). Equals ("yes ")){
Attribute. setvalue ("no ");
}
}
/**
* Modify content 2: Change the owner item to lx and add the date node to the owner node. The content of the date node is.
* Add a property type for the date node.
*/
List = Document. selectnodes ("/books/owner ");
Iter = List. iterator ();
If (ITER. hasnext ()){
Element ownerelement = (element) ITER. Next ();
Ownerelement. settext ("look ");
Element dateelement = ownerelement. addelement ("date ");
Dateelement. settext ("2004-09-11 ");
Dateelement. addattribute ("type", "calendar ");
}

/** Modify content 3: If the title content is dom4j tutorials, delete the node */
List = Document. selectnodes ("/books/book ");
Iter = List. iterator ();
While (ITER. hasnext ()){
Element bookelement = (element) ITER. Next ();
Iterator = bookelement. elementiterator ("title ");
While (iterator. hasnext ()){
Element titleelement = (element) iterator. Next ();
If (titleelement. gettext (). Equals ("dom4j tutorials ")){
Bookelement. Remove (titleelement );
}
}
}

Try {
/** Write the content in the document to the file */
// Xmlwriter writer = new xmlwriter (New filewriter (new file (
// Newfilename )));
Xmlwriter writer = new xmlwriter (New fileoutputstream (
Newfilename ));

Writer. Write (document );
Writer. Close ();
/** If the execution is successful, 1 is returned */
Returnvalue = 1;
} Catch (exception ex ){
Ex. printstacktrace ();
}

} Catch (exception ex ){
Ex. printstacktrace ();
}
Return returnvalue;
}

Public static void main (string [] ARGs) throws exception {

Dom4j dom = new dom4j ();
Bdom4j BD = new bdom4j ();
/* Bd. openxml ("newdom4j. xml ");
System. Out. println (BD. getelementvalue ("owner "));
BD. setelementvalue ("owner", "GG ");
BD. addnodefromroot ("price", "20 ");
BD. savexml ("newdom4j. xml ");*/
System. Out. println ("starting to read the input. xml file ");
Dom. readxmlfile ("demo. xml ");
// Dom. readxmlfile ("dom4j. xml ");
System. Out. println ("read finished, start to write the output. xml file ");
// Dom. createxmlfile ("dom4j. xml ");
// Dom. formatxmlfile ("dom4j. xml ");
// Dom. modixmlfile ("dom4j. xml", "newdom4j. xml ");
// Dom. formatxmlfile ("demo. xml"); // The New fileoutputstream (
// Newfilename) write the file
}
}