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Editor to share with you the JSP programming progress bar design example analysis, I believe that most people do not know much about it, so share this article for your reference, I hope you will learn a lot after reading this article, let's go to know it!

1. Simulation task

First we design a TaskBean class that implements the java.lang.Runnable interface and its run () method runs in a separate thread started by the JSP page (start.jsp). It is the responsibility of another JSP page stop.jsp to terminate the execution of the run () method. The TaskBean class also implements the java.io.Serializable interface so that the JSP page can call it as a JavaBean:

Package test.barBean; import java.io.Serializable; public class TaskBean implements Runnable, Serializable {private int counter; private int sum; private boolean started; private boolean running; private int sleep; public TaskBean () {counter = 0; sum = 0; started = false; running = false; sleep = 100;}}

The "heavy task" included in TaskBean is to calculate 1-2-3. The value of + 100, but it is not calculated by the formula 100 * (1001) / 2x5050, but is calculated by the run () method calling the work () method 100 times. The code for the work () method is shown below, where Thread.sleep () is called to ensure that the task takes about 10 seconds.

Protected void work () {try {Thread.sleep (sleep); counter++; sum + = counter;} catch (InterruptedException e) {setRunning (false);}}

The status.jsp page gets the completion of the task by calling the following getPercent () method:

Public synchronized int getPercent () {return counter;}

If the task has been started, the isStarted () method returns true:

Public synchronized boolean isStarted () {return started;}

If the task has been completed, the isCompleted () method returns true:

Public synchronized boolean isCompleted () {return counter = = 100;}

If the task is running, the isRunning () method returns true:

Public synchronized boolean isRunning () {return running;}

The SetRunning () method is called by start.jsp or stop.jsp when the running parameter is true. The SetRunning () method also marks the task as "started". Calling setRunning (false) requires the run () method to stop execution.

The above is all the contents of the article "sample Analysis of JSP programming Progress Bar Design". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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