The JSP and Javabean combined with simple examples have talked so much, and now I haven't seen the specific application, well, now let's take a look at the specific JavaServer Pages JavaBean example, let us take a look at a simple counter program. This routine contains three files javabean--counter.java files, JavaServer Page- counter.jsp files, counter1.jsp files, counter. Java is primarily used to count the counter counting operation, Counter.jsp and Counter1.jsp The file is mainly used to display the count of the web page.
Counter.java file package count; / ** * Title: Test * description: counter bean * @Author liuyufeng * @version 1.0 * / public class counter {// initialized JavaBean member variable int count = 0; // Class constructor Public counter () {} // GET method public int getCount () {// count operation, each request is made in counting count ; return this.count;} // Attribute Count SET method public void setcount (int count) {this.count = count;}} counter.jsp file
counter </ title> </ head> <body> <h1> jbuilder generated jsp </ h1> <! - Initialization Counter This bean, instance is bean0 -> <jsp: usebean id = "bean0" scope = "Application" class = "count.counter" /> <% // shows the value of the current attribute count, that is, the counter Value, here we use the out.println method, the following counter1.jsp will use another method Out.println ("THE Counter IS:" Bean0.Getcount () "<br>");%> </ Body> </ html> counter1.jsp file <html> <hEAD> <title> counter </ title> </ head> <body> <h1> jbuilder generated jsp </ h1> <! - Initialization Counter This bean, instance Bean0 -> <jsp: usebean id = "bean0" scope = "application" class = "count.counter" /> <! - Using JSP: Get The Property tag gets the value of the count property, that is, the value of the counter -> The counter is: <jsp: getProperty name = "bean0" proty = "count" /> <br> </ body> </ html> From this example We are not difficult to see the general operation of JSP and JavaBean applications, first in the JSP page to declare and initialize JavaBean, this JavaBean has a unique ID flag, there is also a survival scope (set to Application is to achieve multiple users sharing The function of a counter, if you want to implement a single user's counting function, you can modify scope as session), and finally develop JavaBean's Class source count.counter: <</p></div><div class="text-center mt-3 text-grey">
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