EasyPoi简介
用惯了SpringBoot的朋友估计会想到,有没有什么办法可以直接定义好需要导出的数据对象,然后添加几个注解,直接自动实现Excel导入导出功能?
EasyPoi正是这么一款工具,如果你不太熟悉POI,想简单地实现Excel操作,用它就对了!
EasyPoi的目标不是替代POI,而是让一个不懂导入导出的人也能快速使用POI完成Excel的各种操作,而不是看很多API才可以完成这样的工作。
集成
在SpringBoot中集成EasyPoi非常简单,只需添加如下一个依赖即可,真正的开箱即用!
- <dependency>
- <groupId>cn.afterturn</groupId>
- <artifactId>easypoi-spring-boot-starter</artifactId>
- <version>4.4.0</version>
- </dependency>
使用
接下来介绍下EasyPoi的使用,以会员信息和订单信息的导入导出为例,分别实现下简单的单表导出和具有关联信息的复杂导出。
简单导出
我们以会员信息列表导出为例,使用EasyPoi来实现下导出功能,看看是不是够简单!
- 首先创建一个会员对象Member,封装会员信息;
- /**
- * 购物会员
- * Created by macro on 2021/10/12.
- */
- @Data
- @EqualsAndHashCode(callSuper = false)
- public class Member {
- @Excel(name = "ID", width = 10)
- private Long id;
- @Excel(name = "用户名", width = 20, needMerge = true)
- private String username;
- private String password;
- @Excel(name = "昵称", width = 20, needMerge = true)
- private String nickname;
- @Excel(name = "出生日期", width = 20, format = "yyyy-MM-dd")
- private Date birthday;
- @Excel(name = "手机号", width = 20, needMerge = true, desensitizationRule = "3_4")
- private String phone;
- private String icon;
- @Excel(name = "性别", width = 10, replace = {"男_0", "女_1"})
- private Integer gender;
- }
-
在此我们就可以看到EasyPoi的核心注解@Excel,通过在对象上添加@Excel注解,可以将对象信息直接导出到Excel中去,下面对注解中的属性做个介绍;
- name:Excel中的列名;
- width:指定列的宽度;
- needMerge:是否需要纵向合并单元格;
- format:当属性为时间类型时,设置时间的导出导出格式;
- desensitizationRule:数据脱敏处理,3_4表示只显示字符串的前3位和后4位,其他为*号;
- replace:对属性进行替换;
- suffix:对数据添加后缀。
- 接下来我们在Controller中添加一个接口,用于导出会员列表到Excel,具体代码如下;
- /**
- * EasyPoi导入导出测试Controller
- * Created by macro on 2021/10/12.
- */
- @Controller
- @Api(tags = "EasyPoiController", description = "EasyPoi导入导出测试")
- @RequestMapping("/easyPoi")
- public class EasyPoiController {
- @ApiOperation(value = "导出会员列表Excel")
- @RequestMapping(value = "/exportMemberList", method = RequestMethod.GET)
- public void exportMemberList(ModelMap map,
- HttpServletRequest request,
- HttpServletResponse response) {
- List<Member> memberList = LocalJsonUtil.getListFromJson("json/members.json", Member.class);
- ExportParams params = new ExportParams("会员列表", "会员列表", ExcelType.XSSF);
- map.put(NormalExcelConstants.DATA_LIST, memberList);
- map.put(NormalExcelConstants.CLASS, Member.class);
- map.put(NormalExcelConstants.PARAMS, params);
- map.put(NormalExcelConstants.FILE_NAME, "memberList");
- PoiBaseView.render(map, request, response, NormalExcelConstants.EASYPOI_EXCEL_VIEW);
- }
- }
- LocalJsonUtil工具类,可以直接从resources目录下获取JSON数据并转化为对象,例如此处使用的members.json;
- 运行项目,直接通过Swagger访问接口,注意在Swagger中访问接口无法直接下载,需要点击返回结果中的下载按钮才行,访问地址:http://localhost:8088/swagger-ui/
- 下载完成后,查看下文件,一个标准的Excel文件已经被导出了。
简单导入
导入功能实现起来也非常简单,下面以会员信息列表的导入为例。
- 在Controller中添加会员信息导入的接口,这里需要注意的是使用@RequestPart注解修饰文件上传参数,否则在Swagger中就没法显示上传按钮了;
- /**
- * EasyPoi导入导出测试Controller
- * Created by macro on 2021/10/12.
- */
- @Controller
- @Api(tags = "EasyPoiController", description = "EasyPoi导入导出测试")
- @RequestMapping("/easyPoi")
- public class EasyPoiController {
- @ApiOperation("从Excel导入会员列表")
- @RequestMapping(value = "/importMemberList", method = RequestMethod.POST)
- @ResponseBody
- public CommonResult importMemberList(@RequestPart("file") MultipartFile file) {
- ImportParams params = new ImportParams();
- params.setTitleRows(1);
- params.setHeadRows(1);
- try {
- List<Member> list = ExcelImportUtil.importExcel(
- file.getInputStream(),
- Member.class, params);
- return CommonResult.success(list);
- } catch (Exception e) {
- e.printStackTrace();
- return CommonResult.failed("导入失败!");
- }
- }
- }
- 然后在Swagger中测试接口,选择之前导出的Excel文件即可,导入成功后会返回解析到的数据。
复杂导出
当然EasyPoi也可以实现更加复杂的Excel操作,比如导出一个嵌套了会员信息和商品信息的订单列表,下面我们来实现下!
- 首先添加商品对象Product,用于封装商品信息;
- /**
- * 商品
- * Created by macro on 2021/10/12.
- */
- @Data
- @EqualsAndHashCode(callSuper = false)
- public class Product {
- @Excel(name = "ID", width = 10)
- private Long id;
- @Excel(name = "商品SN", width = 20)
- private String productSn;
- @Excel(name = "商品名称", width = 20)
- private String name;
- @Excel(name = "商品副标题", width = 30)
- private String subTitle;
- @Excel(name = "品牌名称", width = 20)
- private String brandName;
- @Excel(name = "商品价格", width = 10)
- private BigDecimal price;
- @Excel(name = "购买数量", width = 10, suffix = "件")
- private Integer count;
- }
- 然后添加订单对象Order,订单和会员是一对一关系,使用@ExcelEntity注解表示,订单和商品是一对多关系,使用@ExcelCollection注解表示,Order就是我们需要导出的嵌套订单数据;
- /**
- * 订单
- * Created by macro on 2021/10/12.
- */
- @Data
- @EqualsAndHashCode(callSuper = false)
- public class Order {
- @Excel(name = "ID", width = 10,needMerge = true)
- private Long id;
- @Excel(name = "订单号", width = 20,needMerge = true)
- private String orderSn;
- @Excel(name = "创建时间", width = 20, format = "yyyy-MM-dd HH:mm:ss",needMerge = true)
- private Date createTime;
- @Excel(name = "收货地址", width = 20,needMerge = true )
- private String receiverAddress;
- @ExcelEntity(name = "会员信息")
- private Member member;
- @ExcelCollection(name = "商品列表")
- private List<Product> productList;
- }
- 接下来在Controller中添加导出订单列表的接口,由于有些会员信息我们不需要导出,可以调用ExportParams中的setExclusions方法排除掉;
- /**
- * EasyPoi导入导出测试Controller
- * Created by macro on 2021/10/12.
- */
- @Controller
- @Api(tags = "EasyPoiController", description = "EasyPoi导入导出测试")
- @RequestMapping("/easyPoi")
- public class EasyPoiController {
- @ApiOperation(value = "导出订单列表Excel")
- @RequestMapping(value = "/exportOrderList", method = RequestMethod.GET)
- public void exportOrderList(ModelMap map,
- HttpServletRequest request,
- HttpServletResponse response) {
- List<Order> orderList = getOrderList();
- ExportParams params = new ExportParams("订单列表", "订单列表", ExcelType.XSSF);
- //导出时排除一些字段
- params.setExclusions(new String[]{"ID", "出生日期", "性别"});
- map.put(NormalExcelConstants.DATA_LIST, orderList);
- map.put(NormalExcelConstants.CLASS, Order.class);
- map.put(NormalExcelConstants.PARAMS, params);
- map.put(NormalExcelConstants.FILE_NAME, "orderList");
- PoiBaseView.render(map, request, response, NormalExcelConstants.EASYPOI_EXCEL_VIEW);
- }
- }
- 在Swagger中访问接口测试,导出订单列表对应Excel;
- 下载完成后,查看下文件,EasyPoi导出复杂的Excel也是很简单的!
自定义处理
如果你想对导出字段进行一些自定义处理,EasyPoi也是支持的,比如在会员信息中,如果用户没有设置昵称,我们添加下暂未设置信息。
- 我们需要添加一个处理器继承默认的ExcelDataHandlerDefaultImpl类,然后在exportHandler方法中实现自定义处理逻辑;
- /**
- * 自定义字段处理
- * Created by macro on 2021/10/13.
- */
- public class MemberExcelDataHandler extends ExcelDataHandlerDefaultImpl<Member> {
- @Override
- public Object exportHandler(Member obj, String name, Object value) {
- if("昵称".equals(name)){
- String emptyValue = "暂未设置";
- if(value==null){
- return super.exportHandler(obj,name,emptyValue);
- }
- if(value instanceof String&&StrUtil.isBlank((String) value)){
- return super.exportHandler(obj,name,emptyValue);
- }
- }
- return super.exportHandler(obj, name, value);
- }
- @Override
- public Object importHandler(Member obj, String name, Object value) {
- return super.importHandler(obj, name, value);
- }
- }
- 然后修改Controller中的接口,调用MemberExcelDataHandler处理器的setNeedHandlerFields设置需要自定义处理的字段,并调用ExportParams的setDataHandler设置自定义处理器;
- /**
- * EasyPoi导入导出测试Controller
- * Created by macro on 2021/10/12.
- */
- @Controller
- @Api(tags = "EasyPoiController", description = "EasyPoi导入导出测试")
- @RequestMapping("/easyPoi")
- public class EasyPoiController {
- @ApiOperation(value = "导出会员列表Excel")
- @RequestMapping(value = "/exportMemberList", method = RequestMethod.GET)
- public void exportMemberList(ModelMap map,
- HttpServletRequest request,
- HttpServletResponse response) {
- List<Member> memberList = LocalJsonUtil.getListFromJson("json/members.json", Member.class);
- ExportParams params = new ExportParams("会员列表", "会员列表", ExcelType.XSSF);
- //对导出结果进行自定义处理
- MemberExcelDataHandler handler = new MemberExcelDataHandler();
- handler.setNeedHandlerFields(new String[]{"昵称"});
- params.setDataHandler(handler);
- map.put(NormalExcelConstants.DATA_LIST, memberList);
- map.put(NormalExcelConstants.CLASS, Member.class);
- map.put(NormalExcelConstants.PARAMS, params);
- map.put(NormalExcelConstants.FILE_NAME, "memberList");
- PoiBaseView.render(map, request, response, NormalExcelConstants.EASYPOI_EXCEL_VIEW);
- }
- }
- 再次调用导出接口,我们可以发现昵称已经添加默认设置了。
总结
体验了一波EasyPoi,它使用注解来操作Excel的方式确实非常好用。如果你想生成更为复杂的Excel的话,可以考虑下它的模板功能。
原文地址:https://mp.weixin.qq.com/s/dyJ2Fr7-Nnnxnhx_2Slhkg