Simple Example Javascript Scripts. It uses a simple form with radio buttons to determine interest.HTML Examples HTML Examples HTML Quiz HTML Certificate HTML Summary. A simple drop-down list. HTML, CSS, JavaScript. Sample JavaScript Programs. Sample #1: To Computer the Square Root of a Number. Writing Simple JavaScript Programs for Your. Head over to our news feed or subscribe below to receive the latest updates from the 5 Minutes of JavaScript newsletter and podcast. The Latest News to Your Inbox. Subscribe now to the weekly 5 Minutes of JavaScript newsletter. Simple Web Applications — Jython Book v. Servlets are a Java platform technology for building web- based. They are a platform- and server- independent. If you are unfamiliar. Java servlets, it would be worthwhile to learn more about. An excellent resource is wikipedia. Java. Java servlets are. Java anymore. Most Java developers. Java Server Pages (JSP), Java Server Faces (JSF), or. Java code. For these cases we can make our lives easier by using. Jython instead. There are also great use- cases for JSP; similarly. Jython for implementing the logic in our JSP code. The. latter technique allows us to apply a model- view- controller (MVC). Either technique is rather. Java web application without any trouble. Another feature offered to us by Jython servlet usage is dynamic. Because Jython compiles at runtime, we can make code. This can make it very easy to test web applications. Configuring Your Web Application for Jython Servlets. Jython contains a built- in. Py. Servlet that facilitates the creation of Java. Jython source files. We can make use of Py. Servlet. quite easily in our application by adding the necessary XML. Py. Servlet class gets loaded at runtime and any file that. Once this. configuration has been added to a web application, and jython. CLASSPATH then the web application is ready. Jython servlets. See Listing 1. Listing 1. 3- 1. Making a Web Application Compatible with Jython< servlet>. Py. Servlet< /servlet- name>. Py. Servlet< /servlet- class>. Py. Servlet< /servlet- name>. Any servlet that is going to be used by a Java servlet container. URL. For the. purposes of this book, we will code a servlet named. New. Jython. Servlet in the next section, so the following XML. See. Listing 1. 3- 2. Listing 1. 3- 2. Coding a Jython Servlet< servlet>. New. Jython. Servlet< /servlet- name>. New. Jython. Servlet< /servlet- class>. New. Jython. Servlet< /servlet- name>. New. Jython. Servlet< /url- pattern>. Writing a Simple Servlet. This abstract class, along with the other. According to the abstract class, there are two methods that. Java servlet, those being do. Get and. do. Post. The former performs the HTTP GET operation while the. HTTP POST operation for a servlet. Other. commonly overridden methods include do. Put, do. Delete, and. Servlet. Info. The first performs the HTTP PUT operation, the. HTTP DELETE operation, and the last provides a. In the following example, and in most. Get and do. Post are used. Let’s first show the code for an extremely simple Java servlet. New. Java. Servlet. IOException. import java. Print. Writer. import javax. Servlet. Exception. Http. Servlet. import javax. Http. Servlet. Request. Http. Servlet. Response. New. Java. Servlet extends Http. Servlet . Now, Listing 1. Jython. Listing 1. Http. Servletclass. New. Jython. Servlet(Http. Servlet): defdo. Get(self,request,response): self. Post(request,response)defdo. Post(self,request,response): to. Client=response. get. Writer()response. Content. Type(. As. Jython offers. If you begin to think about the possibilities. Jython servlet that you can with Java and even. Python language as well. To summarize the use of Jython servlets, you simply include. CLASSPATH. Add necessary. XML to the web. xml, and then finally code the servlet by extending. Http. Servlet abstract class. Using JSP with Jython. Sometimes. using a markup language such as HTML works better for developing. For instance, it is easy enough to. Java. Script code within a Jython servlet. However, all of. the Java. Script code would be written within the context of a. String. Not only does this eliminate the usefulness of an IDE for. Cleanly. separating such code from Jython or Java makes code more clear to. One possible solution. Python template languages such. Django, but using Java Server Pages (JSP) technology can also be. Using a JSP allows one to integrate Java code into HTML markup in. We are not fans of JSP. Although JSP can make it very. Java. Script, HTML, and Java into one file, it can make. Mixing Java code with HTML or. Java. Script is a bad idea. The same would also be true for mixing. Jython and HTML or Java. Script. The Model- View- Controller (MVC) paradigm allows for clean. Java or Jython, and markup. HTML. Java. Script is always gets grouped into the same. HTML because it is a client- side scripting language. In. other words, Java. Script code should also be separated from the. In thinking about MVC, the controller code would be the. Java. Script code used to capture data from the end- user. The view would. be the markup and Java. Script displaying the result. Clean separation using MVC can be achieved successfully by. JSP with Jython servlets. In this section we will take a. As with many of the other. Once you learn how to make use of JSP. Jython servlets you can explore further into the technology. Configuring for JSP. Add the necessary. XML to the web. xml deployment descriptor, include the correct JARs. What is important to note is. Jython servlets must. CLASSPATH. It is common for the Jython servlets. JSP web pages themselves. For simplicity sake, we will place the servlet code into the. JSP, but you can do it differently. Coding the Controller/View. Obviously, this technique utilizes JSP to contain. Java. Script can either be embedded directly into. JSP or reside in separate . The latter is. the preferred method in order to make things clean, but many web. Java. Script within the pages. The JSP in this example is rather simple, there is no Java. Script in. the example and it only contains a couple of input text areas. This. JSP will include two forms because we will have two separate submit. Each of these forms will redirect to a. Jython servlet, which will do something with the data. In our example, the. Not really, but it. JSP and the. servlet implementation. The second form contains two text boxes in. Listing. 1. 3- 5 is the code for this simple JSP. Listing 1. 3- 5. JSP Code for a Simple Controller/Viewer Applicationtest. JSP. jsp< %@page content. Type=. In this. case, the text that is contained within the input textbox named p. Listing 1. 3- 6 is the code for. A Simple Jython Controller Servlet######################################################################## add. It then assigns that value to a. This variable is then assigned to an. The code could just as easily have. JSP, which is how we’d go about creating a. The second form in our JSP takes two values and returns the. If someone were to enter text instead of. While very simplistic, this servlet. See Listing 1. 3- 7. Listing 1. 3- 7. Jython Servlet Business Logic######################################################################## add. In. such cases, the JSP must contain Java code unless a special. Bean Scripting Framework. JSP. For more. details on using Java Server Pages, please take a look at the Sun. Microsystems JSP documentation. Beginning JSP, JSF and Tomcat Web Development: From Novice to Professional from.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
December 2016
Categories |