freemarker中的left_pad和right_pad（十五）

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）当仅仅只有一个参数时，插入的是空白；当有两个参数时，插入的是第二个参数符号；如果第二个参数的长度大于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、示例结果

      [        ]
      [       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]