©2020-2024 ioDraw All rights reserved
There are mainly two types of questions ：filter Filter sequence judgment ,html combination java Method judgment output
Question type 1 ,filter Filter sequence judgment （ Last year ）
method ：（ I give a metaphysical method , Only applicable to insufficient review time , Students who do not understand the code ^_^, Can understand the same code learn , Do well in the exam ）
Let's look at the following question ：
Example 1 , There are two paragraphs in the text Filter.java code , a section Servlet.java code , a section xml code
notes ：Filter Execution sequence and Filter stay web.xml The position in the file is irrelevant , Only and mapping The order of , Whose? mapping before , Just do it first
Problem solving steps ：
（1） find Filter.java Medium doFilter Statements and chain sentence ,xml in <filter-mapping></filter-mapping> Under label MyFilter1,MyFilter2, The red part of the text
（2） Find out where chain Statement the output statement of the previous and next lines of the statement （ May be empty ）,Servlet.java Output statements in , That is, the blue part
（3） We see xml in <filter-mapping></filter-mapping> Under label MyFilter,2 before 1 After , So we write the answers in this order ：
MyFilter2.java Medium chain Output statement from previous line
——>MyFilter1.java Medium chain Output statement from previous line
——>Servlet.java Output statements in
——>MyFilter1.java Medium chain Output statement of the next line
——>MyFilter2.java Medium chain Output statement of the next line
（ If we see xml in <filter-mapping></filter-mapping> Under label MyFilter,1 before 2 After , Then we write them in this order
answer ：
MyFilter1.java Medium chain Output statement from previous line
——>MyFilter2.java Medium chain Output statement from previous line
——>Servlet.java Output statements in
——>MyFilter2.java Medium chain Output statement of the next line
——>MyFilter1.java Medium chain Output statement of the next line ）
Question type II ,html combination java Method judgment output
These types of questions are generally not difficult , We just need to find all the output statements from the code , Then according to html Information in code , Will output variables in the statement , Output after assignment , Let's look at the following example
Example 1 ：
be careful ： Assignment shall be based on <context></context> Statement assignment in tag
Example 2 ：
answer ：
pageScope in user The value of is ：itcast
requestScope in book The value of is ：Java
sessionScope in user The value of is ：it
apploicationScope in book The value of is ：database
Technology