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freemarker中的left_pad和right_pad


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1、简易说明

（1）left_pad 距左边

（2）right_pad 距右边

（3）当只唯独一个參数时，插入的是空白。当有两个參数时。插入的是第二个參数符号；假设第二个參数的长度大于1的话，会周期性地插入该符号


2、举例说明

<#--freemarker中的left_pad 距左边-->
     [${""?left_pad(8)}]
     [${"E"?left_pad(8)}]
     [${"EF"?left_pad(8)}]
     [${"EFG"?left_pad(8)}]
     [${"EFGH"?
left_pad(8)}] [${"EFGHI"?left_pad(8)}] [${"EFGHIJ"?left_pad(8)}] [${"EFGHIJK"?
left_pad(8)}] [${"EFGHIJKL"?left_pad(8)}] [${""?
left_pad(8,"*")}] [${"E"?left_pad(8,"*")}] [${"EF"?left_pad(8,"*")}] [${"EFG"?
left_pad(8,"*")}] [${"EFGH"?left_pad(8,"*")}] [${"EFGHI"?
left_pad(8,"*")}] [${"EFGHIJ"?left_pad(8,"*")}] [${"EFGHIJK"?left_pad(8,"*")}] [${"EFGHIJKL"?
left_pad(8,"*")}] [${""?left_pad(8,"?*?")}] [${"E"?left_pad(8,"?
*?")}] [${"EF"?left_pad(8,"?*?")}] [${"EFG"?left_pad(8,"?*?")}] [${"EFGH"?left_pad(8,"?*?
")}] [${"EFGHI"?left_pad(8,"?
*?")}] [${"EFGHIJ"?left_pad(8,"?*?
")}] [${"EFGHIJK"?left_pad(8,"?
*?")}] [${"EFGHIJKL"?left_pad(8,"?*?")}] <#--freemarker中的right_pad 距右边--> [${""?
right_pad(8)}] [${"E"?right_pad(8)}] [${"EF"?right_pad(8)}] [${"EFG"?right_pad(8)}] [${"EFGH"?right_pad(8)}] [${"EFGHI"?right_pad(8)}] [${"EFGHIJ"?right_pad(8)}] [${"EFGHIJK"?
right_pad(8)}] [${"EFGHIJKL"?right_pad(8)}] [${""?right_pad(8,"*")}] [${"E"?right_pad(8,"*")}] [${"EF"?right_pad(8,"*")}] [${"EFG"?
right_pad(8,"*")}] [${"EFGH"?right_pad(8,"*")}] [${"EFGHI"?right_pad(8,"*")}] [${"EFGHIJ"?right_pad(8,"*")}] [${"EFGHIJK"?right_pad(8,"*")}] [${"EFGHIJKL"?
right_pad(8,"*")}] [${""?right_pad(8,"?*?
")}] [${"E"?
right_pad(8,"?*?")}] [${"EF"?right_pad(8,"?*?
")}] [${"EFG"?right_pad(8,"?*?")}] [${"EFGH"?
right_pad(8,"?*?")}] [${"EFGHI"?right_pad(8,"?
*?")}] [${"EFGHIJ"?right_pad(8,"?*?")}] [${"EFGHIJK"?right_pad(8,"?*?")}] [${"EFGHIJKL"?
right_pad(8,"?*?
")}]

3、演示样例结果 

     [        ]
     [       E]
     [      EF]
     [     EFG]
     [    EFGH]
     [   EFGHI]
     [  EFGHIJ]
     [ EFGHIJK]
     [EFGHIJKL]
     
     [********]
     [*******E]
     [******EF]
     [*****EFG]
     [****EFGH]
     [***EFGHI]
     [**EFGHIJ]
     [*EFGHIJK]
     [EFGHIJKL]
     
     [?*??
*??*] [?
*?
?*?
?E] [?*?
?*?EF] [?*?
?*EFG] [?*??
EFGH] [?
*?
EFGHI] [?*EFGHIJ] [?
EFGHIJK] [EFGHIJKL] [ ] [E ] [EF ] [EFG ] [EFGH ] [EFGHI ] [EFGHIJ ] [EFGHIJK ] [EFGHIJKL] [********] [E*******] [EF******] [EFG*****] [EFGH****] [EFGHI***] [EFGHIJ**] [EFGHIJK*] [EFGHIJKL] [?*?
?
*?
?*] [E*??
*??*] [EF??*??*] [EFG?*?
?*] [EFGH*??
*] [EFGHI?
?*] [EFGHIJ?
*] [EFGHIJK*] [EFGHIJKL]


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