Learning Digester Note: Digester is originally part of the Apache Jakarta Struts program, used to resolve the XML configuration file in the web app, after a period of development, developers think this gadget has very common use, so that this part Independent, put it in the Commons project.
Digester is a tool for converting profiles to Java objects. There are three core concepts: 1: Element matching rule pattern (a bit similar to xpath) → find some partial preparation processing in the XML configuration file 2: Processing rule rule; → Specify One processing rules handle these elements to be processed 3: Object Stack → Follow the steps of the XML configuration file in the XML configuration file in the XML configuration file: 1: Create an instance of a Digester class; 2: Specify Pattern and Rule; 3: Passing an object parameter to the XML file to the parse () method; try {file input = new file (args [0]); file rules = new file (args [1]); / / Create a Digester object and specify the resolution rule Digester Digester = DigesterLoader.creatediGester (rules.tourl ()); // Pass the configuration file reference input to Digester for parsing, the parsed object is the corresponding object; Catalog Catalog = (Catalog) Digester .PARSE (INPUT); System.Out.println (Catalog.toTString ());} catch (exception eXC) {EXC.PrintStackTrace ();} The configuration file INPUT is as follows: Some headline another headline author 2 his other book </ title> </ book> <magazine> <name> MAG Title 2 </ name> <article page = "17"> <headline> second headline </ headline> </ article> </ magazine> </ catalog> Pattern rule file is as follows:</p>
<p><? XML Version = "1.0"?> <digester-rules> <object-create-rule pattern = "catalog" classname = "catalog" /> <set-proties-rule pattern = "catalog"> <alias attr-name = "library" prop-name = "library" /> </ set-proteties-rule> <pattern value = "catalog / book"> <object-create-rule classname = "book" /> <call-method-rule Pattern = "author" methodname = "setauthor" paramcount = "0" /> <call-method-rule pattern = "title" methodname = "settitle" paramcount = "0" /> <set-next-rule methodname = "Addbook "/> </ Pattern> <pattern value =" catalog / magazine "> <object-create-rule classname =" magazine "/> <call-method-rule pattern =" name "methodname =" setName "paramcount =" 0 "/> <Pattern value =" article "> <object-create-rule classname =" article "/> <set-proteties-rule> <alias attr-name =" page "prop-name =" page "/> < / set-properties-rule> <call-method-rule pattern = "headline" methodname = "setheadline" paramcount = "0" /> <set-next-rule methodname = "addAth" /> </ pattern> <set- Next-rule methodname = "addmagazine" /> </ pattern> </ digester-r Ules> Using Digester: 1: Custom Profile 2: Write the Pattern file 3: Write the object class that matches the object, as Catalog, Book, Magazine class above 4: Generate the Digester object instance, specify the rules and input, Conduct parsing: In 3, if Catalog is associated with the Magazine object (</p></div><div class="text-center mt-3 text-grey">
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