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The purpose of this module is to show students how to use Java Swing to render a web page in a JFrame object.

Table of contents

Preface

This module is one in a collection of modules designed for teaching INEW 2338 Advanced Java (Web) at Austin Community College in Austin, TX. More specifically, it is one in asub-collection of modules designed for teaching network programming in that course. The purpose of this module is to show students how to use Java Swingto render a web page in a JFrame object.

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the Figuresand Listings while you are reading about them.

Figures

  • Figure 1 . JFrame output from the program named Java4655c.
  • Figure 2 . Command line output from the program named Java4655c.
  • Figure 3 . JFrame output from the program named Java4655b.
  • Figure 4 . JFrame output from the program named Java4655a.

Listings

  • Listing 1 . Beginning of the program named Java4655c.
  • Listing 2 . The method named runner.
  • Listing 3 . Beginning of the class named Java4655cHtmlHandler.
  • Listing 4 . Open the URL object in a JEditorPane object.
  • Listing 5 . Register a hyperlink listener.
  • Listing 6 . Display the JEditorPane.
  • Listing 7 . The hyperlinkUpdate method.
  • Listing 8 . The constructor for the Java4655bHtmlHandler class.
  • Listing 9 . The HyperlinkEvent handler for Java4655b.
  • Listing 10 . Scrolling code in Java4655a.
  • Listing 11 . The program named Java4655c.
  • Listing 12 . The program named Java4655b.
  • Listing 13 . The program named Java4655a.

Discussion and sample code

In an earlier module, you learned how to connect to a website and cause a raw text version of a file to be downloaded and displayed. However, the display of raw HTMLtext isn't very useful, which is why rendering web browsers were invented.

In this module, you will learn how to connect to a website and cause an HTML file to be downloaded and rendered in a JFrame object. We will develop a program that makes it possible to follow hyperlinks much as you wouldexpect with a commercial web browser.

A skeleton program - Java4655c

I will begin this explanation with a skeleton program that illustrates four important aspects of rendering a webpage in a Swing JFrame object :

  • Getting a URL object that is connected to a webpage.
  • Opening the URL object in a JEditorPane object.
  • Displaying the JEditorPane in a rendered format.
  • Handling hyperlink events on the JEditorPane .

(Note that there are alternatives to the first two items in the above list, which we will see later.)

To keep the code simple, two important aspects of webpage rendering will be omitted from this program:

  • Scrolling large web pages.
  • Following hyperlinks.

These capabilities will be added to other programs later in this module.

Beginning of the program named Java4655c

Questions & Answers

how do you translate this in Algebraic Expressions
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Shanjida
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
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Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
What is lattice structure?
s. Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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