JSP 2 Expression Language
Question
I read tutorials at courses.coreservlets.com (it is on a PDF file so I cannot directly link the exact part of the topic). On JSP 2 Expression Language topic, the author shows comparison between JSP 1.2 and JSP2.
On JSP 1.2:
<BODY>
<jsp:useBean id="randomNum"
type="coreservlets.NumberBean"
scope="request" />
<H2>Random Number:
<jsp:getProperty name="randomNum"
property="number" />
</H2>
</BODY></HTML>
On JSP 2:
<BODY>
<H2>Random Number:
${randomNum.number}
</H2>
</BODY></HTML>
randomNum is just a variable name of NumberBean class right? On JSP 1.2 it shows, but on JSP2 its just a one line.
My question is on JSP 2 how will server know that randomNum is NumberBean because I did not see any part of the code that will tell that randomNum is NumberBean?
I hope I made question clear.
1 answers
solution1
1 ACCPTED 2013-09-01 05:04:54
它不知道，实际上它是在评估EL表达式时在任何范围内搜索页面上下文以找到名称为randomNum的变量。
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.