J2ee (JSP) (syntax part 1)

* JSP: running process on the server container:
After receiving a jsp file request from a customer, the container performs syntax analysis on the jsp file to generate the java servlet source file, compile the file, and then respond to the customer.
* JSP syntax:
# JSP commands
<% @ And %> is used only to set attributes related to the entire page.
There are three common commands
Page, include, taglib
1. page
<@ Page property = "value" property 2 = "value 2" %>
Page attributes:
Language indicates the script language. If it is used for multiple times, the first use prevails.
Example: <% @ page language = "java" %>
Method specifies the java program fragment attributes and method names. The valid values of this attribute include service, doGet, and doPost.
Example: <% @ page method = "doPost" %>
Import specifies the name of the imported java software package and the class name. The list is separated by commas (,). You can use this command to import different software packages multiple times.
Example: <% @ page import = "java. io. *, java. util. *" %>
Content_type specifies the MIME type of the response result. The default type is "text/html ",
The encoding format is "ISO-8859-1" and the language attribute is the same as the language, if the instruction is used multiple times
The first time is used.
<% @ Page content_type = "text/html, charset = GBK" %>
Session = "ture | false" specifies whether the JSP page uses session. The default value is true.
<% @ Page session = "true" %>
ErrorPage = "error_url" specifies the abnormal jump page
Example: <% @ page errorPage = "errorpage. jsp" %>
IsErrorPage = "ture | false"
Indicates whether the JSP webpage is an abnormal webpage.
<% @ Page isErrorPage = "true" %>