Is there something like ASP.NET web user controls in Java / struts / jsp

Question

In the java / struts / jsp world, there is something like an ASP.NET user control, a part of the back-end user interface that executes certain logic and can be pulled out and used elsewhere (for example, something like an input control )

Answer 1

The Java EE API currently offers JSF 2.0 for Facelets. Note that Struts (2) is actually a competitor to JSF, and JSP is a view technology such as ASP, not an MVC framework. According to Java EE 6 / JSF 2.0, JSP has been replaced by Facelets as the default view technology.

In addition to the main JSF implementation, you can choose from a variety of “rich” component libraries that add extra CSS and Ajax sausage, such as PrimeFaces ( showcase ) and OpenFaces ( showcase ).

See also:

• What is the main Java alternative for ASP.NET?
• What is the difference between JSP, Servlet and JSF?
• Java EE 6 Tutorial - Chapters 4-10
• Coreservlets.com JSF 2.0 Tutorial

Answer 2

What you need is called tag files in the JSP. I found that they are not so easy to learn and use as .NET custom elements.

You can use them similarly to .NET controls.

The workflow is as follows.

• Create tag file in web-inf / tags / AtillaTagLibrary / DropDownList.tag

• link to your tag file in your jsp file as shown below

  <%@ taglib prefix="ct" tagdir="/WEB-INF/tags/AtillaTagLibrary"%> 

• Use your tag file as a regular jsp tag.

   <ct:DropDownList /> 

These tag files can receive attribute values ​​from the outside, like user controls.