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Easy Learn Java: Programming Articles, Examples and Tips - Page 281


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Use a Java Applet to access remote Web services

Go to all tips in Java Applets

In this article, I show you how to create a system that uses your browser to request and interact with Web service data from an arbitrary source. First, I create the basic applet, then I create the JavaScript code that pulls the data into the Web page. Finally, I create a servlet that acts as a proxy for non-local requests.

This article assumes that you are familiar with Java technology and (to a lesser extent) with XML. In addition to a Java development environment such as J2SE 1.4 or above, you'll need several pieces of software for this article. To send and receive the SOAP messages, you'll need the SOAP with Attachments Application Program Interface (API) for Java, or SAAJ (see "Send and receive SOAP messages with SAAJ" for help in setting it up) and you'll need a servlet engine such as IBM® WebSphere® Application Server or Apache Tomcat to run the servlet. See Resources for links to the various software packages you'll need.

A simple request
First, take a look at the request you're ultimately going to make from the applet. Although this technique works for any kind of data you can pass through a URL, this article focuses on Web services, so I'll start with the simple SOAP message in Listing 1.

Applets have always been designed to play in a "sandbox" in which they can't hurt anything on a user's system, so their security is tighter than that of their server-based application counterparts. But what if you want an applet that can make arbitrary Web requests? This article shows you how to work around this problem by building a server-based proxy. It also shows you how to use JavaScript code to access applet-based information.

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Posted by Anonymous on Friday, December 17, 2004 (00:00:00) (4319 reads)

How to use Java built-in profiler.

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Question:Can you give good examples on using of Java built-in profiler?

Answer: Yes, read below...

One of the features of Java is automatic allocation and deallocation of memory as objects are created and then no longer referenced. Applications that have a lot of object creation and especial creation of very large objects can stress this process of memory management called garbage collection (GC), and thus can cause the application to perform poorly.

This do*****ent is meant to help you use the -Xrunhprof command to find which objects are filling up the heap and what classes are calling them.

The -Xrunhprof flag

Built into all Java is the hprof tools that allow tracing and profiling information to be output to a file. From a heap debugging standpoint, this tool can provide some basic information, that is fairly easy to interpret. There are two basic functions that can be profiled, one is the live SITES, and the other is to DUMP the entire heap. Each of these then has information that points to a java trace of the object allocation.

The whole 4-pages aryicle you can read here...



comments? | Printer Friendly Page  Send to a Friend | Score: 0
Posted by Anonymous on Wednesday, December 15, 2004 (00:00:00) (4086 reads)

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