简单的ALV显示信息

　　在ALV开发中有两个重要的对象：LAYOUT和FIELDCAT。LAYOUT主要用于设置ALV的输出格式，如输出字段的颜色、表格中的线条等；而FIELDCAT主要用于ALV结构定义，包括具体字段的名称、类型、格式等属性，它们同属于类型池SLIS，在ALV开发中必须导入类型池SLIS。
[For Example]

*ALV使用到的类型池
TYPE-POOLS:SLIS.

DATA wa_alv_field TYPE SLIS_FIELDCAT_ALV.

*列表字段（綁定FIELD）无HEADLER LINE
DATA wa_alv_fieldcat TYPE SLIS_T_FIELDCAT_ALV.

*DATA wa_alv_fieldcat TYPE SLIS_T_FIELDCAT_ALV WITH HEADER LINE. "有HEADLINE LINE定义的FIELDCAT

*定义数据內表
DATA wa_spfli LIKE TABLE OF SPFLI WITH HEADER LINE.

*內表賦值
SELECT * INTO TABLE wa_spfli FROM SPFLI.

   *定義四FIELDCAT信息
     wa_alv_field-COL_POS = 1. *ALV列索引
     wa_alv_field-FIELDNAME = 'CARRID'.*ALV绑定字段
     wa_alv_field-SELTEXT_M = '航班承運人'.*ALV表头显示的文字
     APPEND wa_alv_field TO wa_alv_fieldcat.*內表賦值，无HEADER LINE只能APPEND...TO...

*有HEADER LINE 的FIELDCAT可以直接用对象赋值给对象

*wa_alv_fieldcat-COL_POS = 1.
*wa_alv_fieldcat-FIELDNAME = 'CARRID'.
*wa_alv_fieldcat-SELTEXT_M = '航班承運人'.
*APPEND wa_alv_fieldcat.

     wa_alv_field-COL_POS = 2.
     wa_alv_field-FIELDNAME = 'CONNID'.
     wa_alv_field-SELTEXT_M = '航班數量'.
     APPEND wa_alv_field TO wa_alv_fieldcat.

     wa_alv_field-COL_POS = 3.
     wa_alv_field-FIELDNAME = 'CITYFROM'.
     wa_alv_field-SELTEXT_M = '起飛城市'.
     APPEND wa_alv_field TO wa_alv_fieldcat.

     wa_alv_field-COL_POS = 4.
     wa_alv_field-FIELDNAME = 'CITYTO'.
     wa_alv_field-SELTEXT_M = '目標城市'.
     APPEND wa_alv_field TO wa_alv_fieldcat.

     wa_alv_field-COL_POS = 5.
     wa_alv_field-FIELDNAME = 'AIRPFROM'.
     wa_alv_field-SELTEXT_M = '部門機場'.
     APPEND wa_alv_field TO wa_alv_fieldcat.

     wa_alv_field-COL_POS = 6.
     wa_alv_field-FIELDNAME = 'AIRPTO'.
     wa_alv_field-SELTEXT_M = '目地機場'.
     APPEND wa_alv_field TO wa_alv_fieldcat.

*調用ALV顯示表單
    CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY' "'REUSE_ALV_LIST_DISPLAY' 樣式風格有點迥異
     EXPORTING
       IT_FIELDCAT = wa_alv_fieldcat *设置ALV显示风格对于无HEADER LINE 也可以用wa_alv_fieldcat[],然而有HEADER LINE的只能用后者，否则程序将报错，有无HEADER LINE的FIELDCAT加上[]取回的都是表身吧。
   TABLES
   T_OUTTAB = wa_spfli.

　　程序运行界面如下：