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- 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
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-
- 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^^
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