Red Hat NETSCAPE ENTERPRISE SERVER 6.0 - NSAPI PROGRAMMER GUIDE Bedienungsanleitung PDF herunterladen (Seite 102)

Conversion Steps

102 iPlanet Web Server, Enterprise Edition Programmer’s Guide to Servlets • May 2001

Conversion Steps

When converting applications, follow these steps:

1. Go over the structure of the application to see if there are helper classes that

provide functionality between pages. Convert these helper classes first so that

they are ready to use in your pages. (The

hangman example contains a helper

class, called

hangman.js in the original JavaScript application and called

JavaHangManUtil.java in the JSP application shipped with iPlanet Web

Server 6.0.) Write helpers as

.java files and compile them into .class files

before using them.

2. Define the methods within classes. The methods (functions in JavaScript) must

declare what they return and who can access them. For example, in JavaScript

you can write:

function InitAnswer(str) { function_code }

In Java, the same method must be declared as follows:

public static String InitAnswer(String str) { method_code }

This method passes in a String and returns a String. The public keyword

means that any other class can call this method. The static keyword means that

the virtual machine can run this method without creating an object of the class

containing the method.

3. Convert the client object of the application to a session bean. In Server-Side

JavaScript, data is easier to use in the client object. In a Java Session object, the

programmer must get data from the session and then put it back in if there are

changes. This work can be done in a wrapper bean. The bean handling

functionality of JSPs is very strong. You can specify the scope to be

session

and it is saved in the session automatically.

4. Convert the HTML files to JSP files. This mainly consists of finding the

<SERVER> and </SERVER> tags and replacing them with the <% and %> JSP tags.

Then go through and change the syntax to correct JSP or Java syntax.

5. It is sometimes necessary to add special lines to the file. For example, the line

<%@ page import="HangManUtil,HangBean" %>

imports helper classes, and the line

<jsp:useBean id="client" scope="session" class="HangBean"/>

uses a session bean.

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Red Hat NETSCAPE ENTERPRISE SERVER 6.0 - NSAPI PROGRAMMER GUIDE Bedienungsanleitung Seite 102