Scriptlet将任意代码插入到servlet的_jspService方法中 [英] Scriptlets inserts arbitrary code into servlet's _jspService method
问题描述
Scriptlets允许您将任意代码插入到servlet的_jspService方法中。
任何人都可以用包含代码块的示例来解释这个语句吗？
Can anyone explain this statement with an example containing a block of code?
我知道JSP和Servlets的语法内容，我需要知道的是
I am aware about syntactical stuff of JSP and Servlets, what I need to know is
- 在什么情况下使用任意代码？
- In what context arbitrary code is used?
_jspService（）是一个JSP生命周期的方法，然后，
_jspService() is a method of JSP life cycle then,
- servlet是什么意思方法？
- What does it mean by servlet's method?
推荐答案
事实上，JSP已被容器转换为扩展HttpServlet的Java类，然后该类就像手工编码的servlet一样被编译和执行。
A JSP is in fact transformed by the container into a Java class extending HttpServlet, that class is then compiled and executed exactly as a hand-coded servlet would be.
你在JSP中的代码被转换成Java代码构成生成的servlet的_jspService方法。所以，例如
The code you have into the JSP is transformed into Java code that constitutes the _jspService method of the generated servlet. So, for example
<html>
<% String foo = "hello"; out.println(foo); %>
由容器转换为类似
void _jspService(JspWriter out) {
out.println("<html>");
String foo = "hello"; out.println(foo);
}
所以，无论你写入scriptlet的代码是什么（任意代码）最终在容器从JSP创建的servlet的_jspService方法中。
So, whatever code you write into your scriptlets (arbitrary code) ends up in the _jspService method of the servlet created by the container from the JSP.
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