Spring teplates. Thymeleaf & spring framework презентация

History

Servlets
Hello!
public class HelloWorldServlet extends HttpServlet {
protected void doGet(request, response) {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println(""); out.println(""); out.println("
Hello!
"); out.println("");
out.println("");
out.println("");
out.println("");
}
}
Html symbols are writing directly to the browser from java code.

Servlets
Hello!
public class HelloWorldServlet extends HttpServlet {
protected void doGet(request, response) {
request.getRequestDispatcher("/login.jsp").
forward(request, response);
}
}
Html code saved separately from java code
and can be dynamically changed before sending to browser . It’s good.
Hello!
Hello!
");

Java Servlet-JSP Architecture
Server
Hello World!
Java
Jasper
JSPs
Servlet container

Templates

Template – document or parts of document with basic configuration.
Table
with dynamic content
Left menu
Spam
Header
Footer

Spring templates.
Apache Velocity
FreeMarker
Rythm
Thymeleaf
3.8 seconds
4.8 seconds
3 seconds
43.2 seconds
Results obtained after testing with benchmarking tool
for 10000 requests.

Thymeleaf.
Thymeleaf integration with Spring framework.

Custom properties
Core is a DOM processing engine.
It is based on XML tags and attributes.
XML/Valid XML/XHTML/Valid XHTML/HTML5/Legacy HTML5 processor.
Allows a fast processing of templates by intelligent caching of parsed files.
Not complex syntax.

Syntax compare
FreeMarker syntax:
<#list animals as animal>
<#if animals.python.price != 0>
${animal.name}
${animal.price}
ApacheVelocity syntax:
#foreach($mud in $mudsOnSpecial)
#if($customer.hasPurchased($mud))
#end
#end
$flogger.getPromo($mud)

Syntax compare
Thymeleaf syntax:
NAME
PRICE
IN STOCK
Onions
2.41
yes

Integration with Spring framework
Spring application context: name="suffix" value=".html" />
Html file template:

Standard dialect
Expressions:
Variable Expressions: ${...}
Selection Variable Expressions: *{...}
Message Expressions: #{...}
Link URL Expressions: @{...}
If-then: (if) ? (then)
If-then-else: (if) ? (then) : (else)
Default: (value) ?: (defaultvalue)
Using with basic objects:
#ctx : the context object.
#vars: the context variables.
#locale : the context locale.
#httpServletRequest : (only in Web Contexts) the HttpServletRequest object.
#httpSession : (only in Web Contexts) the HttpSession object.

Expression Utility Objects:
#dates : utility methods for java.util.Date objects: formatting, component extraction, etc.
#calendars : analogous to #dates , but for java.util.Calendar objects.
#numbers : utility methods for formatting numeric objects.
#strings : utility methods for String objects: contains, startsWith, prepending/appending, etc.
#objects : utility methods for objects in general.
#bools : utility methods for boolean evaluation.
#arrays : utility methods for arrays.
#lists : utility methods for lists.
#sets : utility methods for sets.
#maps : utility methods for maps.
#aggregates : utility methods for creating aggregates on arrays or collections.
#messages : utility methods for obtaining externalized messages inside variables expressions, in the same way as they would be obtained using #{…} syntax.
#ids : utility methods for dealing with id attributes that might be repeated.

Dialect extension:
xmlns:th="http://www.thymeleaf.org">

Messages internationalization
Application context:
Class path:

Fragmentation
footer.html
...
Footer
copyrights
...
Index.html
...
...

Usage Examples
Object expression:
Today is:
11 March 2016
Links usage:
view th:href="@{'/details/'+${user.login}(orderId=${o.id})}">view
Conditions usage:
...-
...
...

Default expression:
Some value
Setting attribute:
Forms: th:action="@{/subscribe}">
Iteration:
Onions
2.41

Local variable:
Some Name
.
Set values to JavaScript:
/*<![CDATA[*/
...
var username</div></h3></h3><!----><!----><div class="slides-content">= /*[[${session.user.name}]]*/ ‘User';
...
/*]]>*/
Switch:
User is an administrator
User is a manager

Summary
Advatages:
Java template engine for XML, XHTML and HTML5.
Works both in web and non-web (offline) environments. No hard dependency on the Servlet API.
Several template modes: XML, XHTML 1.0 and 1.1, HTML5:
Internationalization support.
Parsed template cache
Is extensible
Not very complex in usage
Many documentation
Disadvatages:
It's slowly than other templates.