Velocity script Summary

Guidance:
　　Velocity:
Rationale:
$ Username and $! The difference between username. When the username cannot be found, $ username returns the string "$ username", while $! Username returns an empty string ""
So: # Set ($! Username = ') determines whether the string is null.
　　The following is the summary of the velocity script.
1,Declaration: # Set ($ Var = xxx)
The following content can be left
Variable reference
String Literal
Property Reference
Method reference
Number literal # Set ($ I = 1)
Arraylist # Set ($ arr = ["yt1", "T2"])
Technical Arithmetic Operators
2,Note:
Single line ## xxx
Multiple rows
#*
Xxx
Xxxx
Xxxxxxxxxxxx
*#
References reference type
3,Variable Variables
It must start with "$" and the first character must be a letter. Character followed by a VTL identifier. (A. Z
Or a. Z ).
A variable can contain the following characters:
Alphabetic (A. Z, A. Z)
Numeric (0 .. 9)
Hyphen ("-")
Underscore ("_")
4,Properties
$ Identifier. identifier
$ User. Name
NAME value in hashtable user. For example: User. Get ("name ")
5,Methods
Object User. getname () = $ user. getname ()
6,Formal reference notation
Use {} to separate variable names from strings
For example
# Set ($ user = "CSY "}
$ {User} Name
Return csyname
$ Username
$! Username
$ And $! Difference
When the username cannot be found, $ username returns the string "$ username", while $! Username returns an empty string ""
7,Double quotation marks and quotation marks
# Set ($ Var = "HELO ")
Test "$ Var" returns testhello
Test' $ var 'returns test' $ var'
You can change the default processing mode by setting stringliterals. interpolate = false.
8,Condition Statement
# If ($ Foo)
　　Velocity!
# End
# If ($ Foo)
# Elseif ()
# Else
# End
When $ foo is null or a Boolean object's false value, it is executed.
9,Logical OPERATOR: ==&||!
10,Loop statement # foreach ($ VaR in $ arrays)// The set contains the following three vectors: A hashtable or an array
# End
# Foreach ($ product in $ allproducts)
　　

$ Product

# End
# Foreach ($ key in $ allproducts. keyset ())
　　

Key: $ key-> value: $ allproducts. Get ($ key)

# End
# Foreach ($ customer in $ customerlist)
　　
$ Velocitycount$ Customer. Name

# End
11,The velocitycount variable is defined in the configuration file.
# Default name of the loop counter
# Variable reference.
Directive. foreach. Counter. Name = velocitycount
# Default starting value of the loop
# Counter variable reference.
Directive. foreach. Counter. Initial. value = 1
12,Include files
# Include ("one.gif", "two.txt", "three.htm ")
13,Parse import script
# Parse ("me. VM ")
14,# Stop stop execution and return
15,Define the macro velocimacros, which is equivalent to the function supporting the inclusion Function
# Macro (d)
　　

# End
Call
# D ()
16,Macro with Parameters
# Macro (tablerows $ color $ somelist)
# Foreach ($ something in $ somelist)
　　
$ Something

# End
# End
17,Range Operator
# Foreach ($ Foo in [1 .. 5])
　　
Posted @ 2008-06-18 square inch reading (24) | comment (0) | Edit

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