JSP Tutorials
51. Disabling Scriptlets in JSP using web.xml
By: Emiley J : 2007-09-23
Description: The EL is intended to replace the use of Java scriptlets in developing JSPbased web applications. To this end, it's possible to disable the evaluation of scriptlets through configuration parameters. This allows a developer to ensure that no one inadvertently uses scriptlets instead of the EL. This can allow best practices to be more easily enforced.
52. Arithmetic Evaluation Using the Expression Language in JSP
By: Fazal : 2007-09-23
Description: This tutorial explains using the EL to evaluate arithmetic operations. There are many cases within web-application development where you need to perform some mathematics on a page. This might be to show a number within the text of a page or to pass a number to a custom tag. In either case, the concepts are exactly the same.
53. Comparison operators in JSP
By: Grenfel : 2007-09-23
Description: A useful feature of the EL is the ability to perform comparisons, either between numbers or objects. This feature is used primarily for the values of custom tag attributes, but can equally be used to write out the result of a comparison (true or false) to the JSP page. The EL provides the following comparison operators:
54. NotifyUtil::java.net.ConnectException: Connection refused: connect
By: Ramlak : 2007-06-28
Description: If you are seeing this 'NotifyUtil::java.net.ConnectException: Connection refused: connect'. Here is the solution to resolve this issue.
55. Debugging Servlets
By: aathishankaran : 2007-02-14
Description: Naturally, when you write servlets, you never make mistakes. However, some of your colleagues might make an occasional error, and you can pass this advice on to them. Seriously, though, debugging servlets can be tricky because you don't execute them directly. Instead, you trigger their execution by means of an HTTP request, and the Web server executes them. This remote execution makes it difficult to insert break points or to read debugging messages and stack traces. So, approaches to servlet debugging differ somewhat from those used in general development. Here are seven general strategies that can make your life easier.
56. A Servlet That Generates HTML
By: aathishankaran : 2007-02-14
Description: Most servlets generate HTML, not plain text as in the previous example. To build HTML, you need two additional steps:
57. A Simple Servlet Generating Plain Text
By: aathishankaran : 2007-02-14
Description: This below program shows a simple servlet that just generates plain text, with the output. A Servlet That Generates HTML shows the more usual case where HTML is generated. However, before moving on, it is worth spending some time going through the process of installing, compiling, and running this simple servlet.
58. Example Using Initialization Parameters
By: aathishankaran : 2007-02-14
Description: This program shows a servlet that reads the message and repeats initialization parameters when initialized. It shows the result when message is Shibboleth, repeats is 5, and the servlet is registered under the name ShowMsg. Remember that, although servlets read init parameters in a standard way, developers set init parameters in a server-specific manner. Please refer to your server documentation for authoritative details.
59. LotteryNumbers generation using Java
By: aathishankaran : 2007-02-14
Description: The program shows a servlet that uses init to do two things. First, it builds an array of 10 integers. Since these numbers are based upon complex calculations, I don't want to repeat the computation for each request. So I have doGet look up the values that init computed instead of generating them each time. The results of this technique are shown. However, since all users get the same result, init also stores a page modification date that is used by the getLastModified method.
60. Basic Servlet Structure
By: aathishankaran : 2007-02-14
Description: Listing outlines of a basic servlet that handles GET requests. GET requests, for those unfamiliar with HTTP, are the usual type of browser requests for Web pages. A browser generates this request when the user types a URL on the address line, follows a link from a Web page, or submits an HTML form that does not specify a METHOD.