freemarker中的left_pad和right_pad

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freemarker中的left_pad和right_pad

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]