Dom4j operation XML (including encapsulation and parsing)
Let's take a look at the inheritance relationships established by the DOM tree corresponding to XML in dom4j.
For the XML standard definition that corresponds to the content listed in Figure 2-1, dom4j provides the following implementation:
The following is an example:
Package com. iboxpay. Settlement. Gateway. Common. util;
Import java. Io. ioexception;
Import java. Io. stringreader;
Import java. Io. stringwriter;
Import org. dom4j. Document;
Import org. dom4j. extends entexception;
Import org. dom4j. documenthelper;
Import org. dom4j. element;
Import org. dom4j. Io. outputformat;
Import org. dom4j. Io. saxreader;
Import org. dom4j. Io. xmlwriter;
Import com. iboxpay. Settlement. Gateway. CCB. constant;
Import com. iboxpay. Settlement. Gateway. Common. Exception. packmessageexception;
Import com. iboxpay. Settlement. Gateway. Common. Exception. parsemessageexception;
/**
* Dom4j tool class
* @ Author caolipeng
*/
Public class domutil {
/**
* Add child node Elements
* @ Param parent node
* @ Param childname child node name
* @ Param childvalue child node Value
* @ Return Add a node
*/
Public static element addchild (element parent, string childname,
String childvalue ){
Element child = parent. addelement (childname); // Add a node Element
Child. settext (childvalue = NULL? "": Childvalue); // set the value for the element
Return child;
}
/**
* Convert the Document Object of dom4j to an XML message string.
* @ Param document
* @ Param charset
* @ Return the parsed XML string
*/
Public static string documenttostring (document, string charset ){
Stringwriter = new stringwriter ();
Outputformat format = outputformat. createprettyprint (); // get the formatted output stream
Format. setencoding (charset); // sets the character set, which defaults to the UTF-8
Xmlwriter = new xmlwriter (stringwriter, format); // write a file stream
Try {
Xmlwriter. Write (document );
Xmlwriter. Flush ();
Xmlwriter. Close ();
} Catch (ioexception e ){
Throw new runtimeexception (E );
}
Return stringwriter. tostring ();
}
/**
* Remove the Declaration header (that is, <? XML...?> Remove)
* @ Param document
* @ Param charset
* @ Return
*/
Public static string documenttostringnodeclaredheader (document, string charset ){
String xml = documenttostring (document, charset );
Return XML. replacefirst ("\ s * <[^ <>] +> \ s *","");
}
/**
* Parse XML as a Document Object
* @ Param XML the parsed XML
* @ Return document
* @ Throws parsemessageexception
*/
Public final static element parsexml (string XML) throws parsemessageexception {
Stringreader sr = new stringreader (XML );
Saxreader = new saxreader ();
Document document;
Try {
Document = saxreader. Read (SR );
} Catch (incluentexception e ){
Throw new parsemessageexception (E );
}
Element rootelement = Document. getrootelement ();
Return rootelement;
}
Public final static string gettext (Element E, string tag ){
Element _ e = E. element (TAG );
If (_ e! = NULL)
Return _ E. gettext ();
Else
Return NULL;
}
Public final static string gettexttrim (Element E, string tag ){
Element _ e = E. element (TAG );
If (_ e! = NULL)
Return _ E. gettexttrim ();
Else
Return NULL;
}
/**
* Get the node value. The node must not be blank; otherwise, an error is thrown.
* @ Param parent
* @ Param tag
* @ Return
* @ Throws parsemessageexception
*/
Public final static string gettexttrimnotnull (element parent, string tag) throws parsemessageexception {
Element E = parent. element (TAG );
If (E = NULL)
Throw new parsemessageexception (parent. getname () + "->" + tag + "node is empty .");
Else
Return e. gettexttrim ();
}
/**
* The node must not be blank; otherwise, an error is thrown.
* @ Param parent
* @ Param tag
* @ Return
* @ Throws parsemessageexception
*/
Public final static element elementnotnull (element parent, string tag) throws parsemessageexception {
Element E = parent. element (TAG );
If (E = NULL)
Throw new parsemessageexception (parent. getname () + "->" + tag + "node is empty .");
Else
Return E;
}
Public static void main (string [] ARGs) throws packmessageexception, parsemessageexception {
Document document = incluenthelper. createdocument ();
Document. setxmlencoding ("gb2312 ");
Element root = Document. addelement ("TX ");
Domutil. addchild (root, "request_sn", "bankbatchseqid ");
Domutil. addchild (root, "cust_id", "cust_id ");
Domutil. addchild (root, "user_id", "user_id ");
Domutil. addchild (root, "password", "password ");
Domutil. addchild (root, "tx_code", "txcode ");
Domutil. addchild (root, "language", "cn ");
Element tx_info = root. addelement (constant. tx_info );
Domutil. addchild (tx_info, constant. request_sn1, "request_sn1 ");
String xml = domutil.doc umenttostringnodeclaredheader (root. getdocument (), "GBK ");
System. Out. println (XML );
Root = parsexml (XML );
System. Out. println (root. element ("tx_info"). elementtext ("request_sn1 "));
}
}
The main function test result is:
<TX>
<Request_sn> bankbatchseqid </request_sn>
<Cust_id> cust_id </cust_id>
<User_id> user_id </user_id>
<Password> password </password>
<Tx_code> txcode </tx_code>
<Language> CN </language>
<Tx_info>
<Request_sn1> request_sn1 </request_sn1>
</Tx_info>
</TX>
Request_sn1
Blog references: http://www.cnblogs.com/macula/archive/2011/07/27/2118003.html
Dom4j operation XML (including encapsulation and parsing)
