| @@ -0,0 +1,131 @@ | |||
| 2.4 注解变种-更自由的导出 | |||
| === | |||
| 这天老师又把路飞喊道的办公室,要求路飞导出班级学生的整体信息 | |||
| ```java | |||
| @Excel(name = "学生姓名", height = 20, width = 30, isImportField = "true_st") | |||
| private String name; | |||
| @Excel(name = "学生性别", replace = { "男_1", "女_2" }, suffix = "生", isImportField = "true_st") | |||
| private int sex; | |||
| @Excel(name = "出生日期", databaseFormat = "yyyyMMddHHmmss", format = "yyyy-MM-dd", isImportField = "true_st", width = 20) | |||
| private Date birthday; | |||
| @Excel(name = "进校日期", databaseFormat = "yyyyMMddHHmmss", format = "yyyy-MM-dd") | |||
| private Date registrationDate; | |||
| ``` | |||
| 路飞飞快的用到上面的学到的知识搞定了,这这时有一个老师把路飞叫去,说想要导出一个不要出生日期的Excel,感觉用户需求很无奈,路飞又造两个一个bean,把这个注解去掉了,来导出 | |||
| ```java | |||
| @Excel(name = "学生姓名", height = 20, width = 30, isImportField = "true_st") | |||
| private String name; | |||
| @Excel(name = "学生性别", replace = { "男_1", "女_2" }, suffix = "生", isImportField = "true_st") | |||
| private int sex; | |||
| @Excel(name = "进校日期", databaseFormat = "yyyyMMddHHmmss", format = "yyyy-MM-dd") | |||
| private Date registrationDate; | |||
| ``` | |||
| 虽然解决了老师的需求,但这个并不是一个完美的解决方案,下面介绍一个更自由的解决方案 | |||
| 注解的导出,规定我们必须把model写好,并且注解写好,每次导出的Excel都是固定的,无法动态控制导出的列,虽然可以通过id来处理一个案例,但是自由度远远不够,这里介绍个变种支持,基本支持注解所有的功能 | |||
| 基于List<ExcelExportEntity> 的导出,ExcelExportEntity是注解经过处理翻译成的实体类,两者几乎是一对的,所以如果我们要动态自定义导出列,我们只要动态拼装ExcelExportEntity就可以了 | |||
| 下面我们看下这个类 | |||
| ```java | |||
| /** | |||
| * 如果是MAP导出,这个是map的key | |||
| */ | |||
| private Object key; | |||
| private double width = 10; | |||
| private double height = 10; | |||
| /** | |||
| * 图片的类型,1是文件,2是数据库 | |||
| */ | |||
| private int exportImageType = 0; | |||
| /** | |||
| * 排序顺序 | |||
| */ | |||
| private int orderNum = 0; | |||
| /** | |||
| * 是否支持换行 | |||
| */ | |||
| private boolean isWrap; | |||
| /** | |||
| * 是否需要合并 | |||
| */ | |||
| private boolean needMerge; | |||
| /** | |||
| * 单元格纵向合并 | |||
| */ | |||
| private boolean mergeVertical; | |||
| /** | |||
| * 合并依赖 | |||
| */ | |||
| private int[] mergeRely; | |||
| /** | |||
| * 后缀 | |||
| */ | |||
| private String suffix; | |||
| /** | |||
| * 统计 | |||
| */ | |||
| private boolean isStatistics; | |||
| private String numFormat; | |||
| private List<ExcelExportEntity> list; | |||
| ``` | |||
| 基本上是和注解对应的, **List<ExcelExportEntity> list 这个是对应的一对多的导出,相当于集合,其他基本上都是和注解保持一致** | |||
| 下面给出正常的demo | |||
| ```java | |||
| public void test() { | |||
| try { | |||
| List<ExcelExportEntity> entity = new ArrayList<ExcelExportEntity>(); | |||
| //构造对象等同于@Excel | |||
| ExcelExportEntity excelentity = new ExcelExportEntity("姓名", "name"); | |||
| excelentity.setNeedMerge(true); | |||
| entity.add(excelentity); | |||
| entity.add(new ExcelExportEntity("性别", "sex")); | |||
| excelentity = new ExcelExportEntity(null, "students"); | |||
| List<ExcelExportEntity> temp = new ArrayList<ExcelExportEntity>(); | |||
| temp.add(new ExcelExportEntity("姓名", "name")); | |||
| temp.add(new ExcelExportEntity("性别", "sex")); | |||
| //构造List等同于@ExcelCollection | |||
| excelentity.setList(temp); | |||
| entity.add(excelentity); | |||
| List<Map<String, Object>> list = new ArrayList<Map<String, Object>>(); | |||
| //把我们构造好的bean对象放到params就可以了 | |||
| Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams("测试", "测试"), entity, | |||
| list); | |||
| FileOutputStream fos = new FileOutputStream("D:/excel/ExcelExportForMap.tt.xls"); | |||
| workbook.write(fos); | |||
| fos.close(); | |||
| } catch (FileNotFoundException e) { | |||
| e.printStackTrace(); | |||
| } catch (IOException e) { | |||
| e.printStackTrace(); | |||
| } | |||
| } | |||
| ``` | |||
| 路飞想到了这个方案,并且用上面做了测试可以完美解决所以他把之前的代码改为了(**代码有删减,基本上都是和注解对应的**) | |||
| ```java | |||
| List<ExcelExportEntity> beanList = new ArrayList<ExcelExportEntity>(); | |||
| beanList .add(new ExcelExportEntity(new ExcelExportEntity("学生姓名", "name")); | |||
| beanList .add(new ExcelExportEntity("学生性别", "sex")); | |||
| beanList .add(new ExcelExportEntity("进校日期", "registrationDate")); | |||
| if(needBirthday()){ | |||
| beanList .add(new ExcelExportEntity("出生日期", "birthday")); | |||
| } | |||
| Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams("测试", "测试"), beanList , | |||
| list); | |||
| ``` | |||
| 用同一套代买完美了支持了老师的需求,心满意足的回宿舍了^^ | |||