Advantages, Disadvantages and Basic Operations of JSP

Small script
　 Writing java code is equivalent to writing code in the service method of index.java

Mini script rules:
　　1. The scripting language you use determines the rules of the script applet;
　　2. Statements are separated by semicolons;
3. You can use the default object, the imported class, the methods and objects declared by declaration, and the objects declared in the useBean tag.

Statement
　Writing Java code is equivalent to writing Java code in the index.java class, outside the service method Write code

　Declaration rules:
　1. The variables and methods declared in JSP correspond to the instance methods and instance variables in the Servlet. These will be shared by all users who request the page at the same time;
2. Variables or methods must be defined before using them (it does not mean that the position where the variables are declared must be in front of the used variables in the page. It means that the variable cannot be used if it is not declared);
　3. The scope of the declared variable or method is the current page or the included page;
　4. Between statements Separate with semicolons.
Expression
　Identical

Expression rules:
1. The scripting language you use determines the rules of the script applet;
2. The order of execution is from left to right; <strong></strong>
3. Semicolons cannot be used in expressions. <strong></strong>

##Comments
　jsp will not be translated
<strong></strong>　html will not be displayed
<strong></strong>　java comment:// /* */ will not be compiled
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