Day05-xml restriction and analysis of the Java EE Employment class in the 168 phase of Chuan Zhi

* Curriculum Review:
* Introduction to DOM parsing HTML
* DOM Document Object model
* Parser

* Document Object
* getElementById ("value of id"); Returns an element (label) object
* Getelementsbyname ("name"); return array
* getElementsByTagName ("tag name"); return array

* Create an Element object
Document.createelement ("element name");
document.createTextNode ("text content");
AppendChild (node); The parent node calls the method
InsertBefore (new,old) to add a child node before the specified node

* Element Object
* Operation Properties SetAttribute ("", "") set or modify properties
GetAttribute ("attribute name");
RemoveAttribute ("attribute name");

* Get child nodes
getElementsByTagName ("element name of the child node");

* Node Nodes Object
* Nodenamenodetype NodeValue
* ParentNode Parent Node (* * * * *)

* AppendChild (node); The parent node calls the method
* InsertBefore (new,old) adds a child node before the specified node
* ReplaceChild (new,old) Replacement node
* RemoveChild (node) Delete node
* CloneNode (true or False) copy node

* innerHTML get and set text content
<span></span>

* Event
* OnClick Click event
* OnDblClick Double-click Event
* OnLoad Load Event
* Onfoucs Get focus
* Onblur loses focus
* OnChange Change Event

* OnSubmit Control form submission

=============================================================================================================
* OnSubmit Event
* Control Form Submission. Need to put onsubmit action on the form <form onsubmit= "" >
* The notation of the value: onsubmit= "return run ()"
* Run () must have a return value and must return TRUE or False.
* If the return is true, the form can be submitted, and if it returns false, the form cannot be submitted. If there is no return value, the default is form Submission.
* What does the logic of run () write?
* Check the Form.

* Form can be submitted via Js.
Get form by ID
var form = document.getElementById ("formId");
Get a form through the properties of the Form's name
var form = document.form1;
var name = document.form1.username.value;
Alert (name);

Set the path of the submission
Form.action = "success.html";
Form.method = "get";
Submit Form
Form.submit ();


* XML (* * * *)

* Introduction to XML
* XML Extensible Markup Language. (very similar to HTML)
* Extensible.
* Customize the Label.

* XML transmits data, HTML is display Data.

* Version of Xml: XML1.0 (using this version) XML1.1 (not backwards Compatible)
* What do you do with it?
* Describe the data that is related

* Application
* As a configuration File.

* Data transfer between the system and the system is Possible.
* Webserivicesoapxml Package data
* JSON and XML concepts

* Syntax FOR XML
* Document Declaration (* * * * *)
* Notation: <?xml version= "1.0"?>
* The document declaration must appear in the first and first column locations of the XML file.

Properties
* version= version of "1.0" XML (must be written)
* encoding= "UTF-8" encoding set (optional)
* standalone= "yes or no" indicates whether the XML file is Independent. (if no, not independent, can introduce external files) (optional)
* Because this property is not written, external files can be Introduced.

* Garbled will accompany your life?
* Cause: the encoding used when saving the file and opening the file is Inconsistent.
* Workaround: Save the file to open the file using the same encoding as Ok. (myeclipse does not cause garbled Problems)


* Element (* * *)
* Start tag and end Tag.
* contains tag body:<abc> text </abc>
* Does not include the label body:<abc/>

* Cannot cross-nest
* Only one root element (must have, and only one)

* Naming specification:
* Case-sensitive:<a></a> represent two tags
* Cannot start wrong:<1a><-a> with numbers and-dashes
* Cannot start with an XML (xmlxml XML) error:<xmlaa>
* cannot contain spaces and colons.

* Attributes (* * *)
* custom: naming specification Ibid.
* cannot have the same attribute on the same element. （*****）
* double quotes or single quotes can be Used.


* Note (*)
* Same as HTML comments
<!--xml comments--

* Comments cannot be nested.

* Special Characters
* <&lt;
* >&gt;
* &&amp;
* "&quot;
* ' &apos;

* CDATA Zone
* Use the contents of the tag as a string.
Syntax
<! [cdata[
Content: as a string
]]>

* PI (processing Instructions) (forgot)
* Replace HTML


* Constraints of XML
* DTD
* Schema

<myspring>
<bean>hello.java</bean>
< cat/>
</myspring>

* Well-Formed Xml: follows the syntax Specification.
* Valid Xml: Constrained.


* DTD constraints
* Quick Start
* Quick Start Steps:
* What labels do I need to appear?
* Writing elements in a DTD file
<! element element name elements type >
* Determine if the element is complex or simple?
* If it is a simple element: (#PCDATA) represents a string
* If it is a complex element: (child Node)

* files that need to be introduced in Book.xml DTD
* <! DOCTYPE root node SYSTEM "dtd file address" >

* How DTDs are associated with XML documents
* The DTD code can be written directly in the XML file. (often Used)
<! DOCTYPE root Node [
The code for the DTD
]>

* Introduction of local DTD files (frequently used)
<! DOCTYPE root node SYSTEM "dtd file address" >

* Introduction of DTD files on the network
<! DOCTYPE root node public "dtd file name" "dtd file address" >


* Element definition
* Syntax: <! element element name elements type >

* (#PCDATA) String
* Empty space
* Any arbitrary
* (child Element)

* Child Elements:
* The relationship between child elements
*, child elements appear in order
* | Child elements can only appear with one

* Number of occurrences of child elements
* + child element appears 1 or more times
* * child element appears 0 or more times
* child element appears 0 or 1 times

<! ELEMENT MYFILE (title*, AUTHOR?, EMAIL) * | COMMENT) >

<MYFILE>
<TITLE></TITLE>
<AUTHOR></AUTHOR>
<EMAIL></EMAIL>
<TITLE></TITLE>
<AUTHOR></AUTHOR>
<EMAIL></EMAIL>
<TITLE></TITLE>
<AUTHOR></AUTHOR>
<EMAIL></EMAIL>
</MYFILE>



* Attribute Definition (attributelist)
* Wording: <! attlist element name
Property Name Property Type property constraint
Property Name Property Type property constraint
>
* Attribute Type
* CDATA String
* Enumeration (no keywords Provided) (men | women)
* ID represents a unique value and cannot be written in numbers only

* Attributes are constrained
* #REQUIRED必须出现的
* #IMPLIED可选的
* #FIXED固定值 #fixed "value"
* Default Value (not used)

* Entity definition (not much used)
* <! ENTITY alias "value" >
* You need to introduce aliases in the xml, and when the browser opens the file, it displays the value in the introduced Location.



* Parsing xml
* What are the ways to parse xml?
* There are two kinds of commonly used? Dom and sax
Difference
DOM Parsing xml
* Form a tree structure in memory
* Cons: If the document is too large, it is prone to memory overflow problems.
* Advantages: easy to do and delete and change the operation

Sax parsing
* event-driven, Edge-read Edge Parsing
* Advantage: no memory overflow Issue.
* Disadvantages: can not do additions and deletions to change Operation. (dom4j in memory spanning tree Structure)

*, only use Dom mode, if sax, can only do query.
* DOM4J (* * * * *) provided by Jaxpsun
* Want to do additions and deletions to enterprises are in Use. Provided by dom4j
* All can be done.
* JDOM (not Spoken)


* Parsing HTML for JAXP
* DOM
* Documentbuilderfactory: Parser Factory class
* Documentbuilder Get Parser Object
* Parse XML (Document parse (String URI))
Get Parser Factory class
Documentbuilderfactory factory = Documentbuilderfactory.newinstance ();
Get Parser Object
Documentbuilder builder = Factory.newdocumentbuilder ();
Parses the XML document and returns the file object
Document document = Builder.parse ("src/book2.xml");


* Write back
* Get back to write factory class
* Get Write-back Object
* Callback method is called to write Back.
Create a factory that writes back classes
Transformerfactory transformerfactory = transformerfactory.newinstance ();
Get Write-back Class
Transformer Transformer = Transformerfactory.newtransformer ();
Method of calling write back
Transformer.transform (new domsource (document), new Streamresult ("src/book2.xml"));



* job: node InsertBefore (node newChild, node Refchild)
To add a child node before the specified node


* Update the contents of the node


* Gets the property value of the tag

Day05-xml restriction and analysis of the Java EE Employment class in the 168 phase of Chuan Zhi