JSP (3)-Add dynamic content by expression

js| dynamic in our previous chapters, any HTML file can be transformed into a JSP file by changing its extension to. jsp. Of course, we need to know what makes JSP useful? The answer is the ability to embed Java. Place the following text in a file with a. jsp extension, such as a myjsp.jsp file, and then place the file in your JSP directory and look it up in the browser. The following are the specific code:

＜HTML＞

＜BODY＞

Hello! The time is now ＜%= new java.util.Date() %＞

＜/BODY＞

＜/HTML＞

Notice here that every time you overload a Web page in a browser, it appears at the current time. The function of the character series <%= and%> is to circle the Java expression, which is computed at run time.

Because of this, it is possible to use JSP to generate Dynamic HTML Web pages in response to the user's actions.

Well, after the end of the tutorial you'd better practice: Write a JSP for the different system properties to output the values returned by System.getproperty, such as Java.version, Java.home, Os.name, User.home and User.dir and so on.