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2.3.2 集合定义 |
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=== |
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路飞很快的完成了老师的任务,花了也就是喝杯茶的时间,就交差了,但过了一会就又被老师叫去了,让他给出一个某个班级选择选择某些课的学生以及对应的老师 |
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路飞又很快的想到了Easypoi,其中有一对多的导出,这不正是一对多的体现吗,然后他继续定义实体: |
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一个课程对应一个老师 |
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一个课程对应N个学生 |
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课程的实体 |
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```java |
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@ExcelTarget("courseEntity") |
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public class CourseEntity implements java.io.Serializable { |
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/** 主键 */ |
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private String id; |
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/** 课程名称 */ |
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@Excel(name = "课程名称", orderNum = "1", width = 25) |
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private String name; |
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/** 老师主键 */ |
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@ExcelEntity(id = "absent") |
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private TeacherEntity mathTeacher; |
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@ExcelCollection(name = "学生", orderNum = "4") |
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private List<StudentEntity> students; |
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} |
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``` |
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教师的实体 |
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```java |
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@ExcelTarget("teacherEntity") |
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public class TeacherEntity implements java.io.Serializable { |
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private String id; |
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/** name */ |
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@Excel(name = "主讲老师_major,代课老师_absent", orderNum = "1", isImportField = "true_major,true_absent") |
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private String name; |
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``` |
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这里在课程这个实体里面就完成了一堆多的导出,达到了我们基础需求,同时使用了orderNum对我们的列进行了排序,满足老师的需求,导出代码如下 |
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```java |
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Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams("2412312", "测试", "测试"), |
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CourseEntity.class, list); |
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``` |
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这样我们就完成了老师的需求,效果如图2.3.2-1 |
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但是课程名和代课老师没有合并,不太美观 |
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路飞又果断给课程名称和代课老师加了needMerge = true的属性,就可以完成单元格的合并 |
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```java |
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/** 课程名称 */ |
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@Excel(name = "课程名称", orderNum = "1", width = 25,needMerge = true) |
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private String name; |
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//-------------------------------- |
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/** name */ |
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@Excel(name = "主讲老师_major,代课老师_absent", orderNum = "1",needMerge = true, isImportField = "true_major,true_absent") |
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``` |
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效果如图2.3.2-2 |
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到这里,路飞就完美的完成了老师的任务,快乐的去交差了 |
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![图2.3.2-1](https://static.oschina.net/uploads/space/2017/0622/221100_MD8y_1157922.png) |
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![图2.3.2-2](https://static.oschina.net/uploads/space/2017/0622/222202_217m_1157922.png) |
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