easypoi导出数据的两种方式（动态表头导出和静态表头导出）_easypoi 导出列的顺序

一.选定easypoi版本（maven依赖）

        <dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi</artifactId>
			<version>4.1.2</version>
		</dependency>
		<dependency>
			<groupId>cn.afterturn</groupId>
			<artifactId>easypoi-base</artifactId>
			<version>4.2.0</version>
		</dependency>

二.导出的方式

1.默认写死的实体顺序导出

1.定义实体User类,实体类上有注解，注解属性: name 导出excel的表头   orderNum 字段在excel的顺序   replace  替换 将数字转为对应的含义

public class User implements Serializable {
    private static final long serialVersionUID = -6909818297910280264L;
 
    @Excel(name = "用户id",orderNum = "0")
    private Integer userId;
 
    @Excel(name = "用户姓名",orderNum = "1")
    private String userName;
 
    @Excel(name = "用户年龄",orderNum = "2")
    private Integer age;
 
    @Excel(name = "用户地址",orderNum = "3")
    private String userAddress;
 
    @Excel(name = "性别", replace = {"男_10", "女_20"} ,orderNum = "4")
    private Integer sex;
 
}

2.controller层代码 注意：方法的请求格式只能是get请求，post将失败

    @GetMapping("/exportOrderList")
    public String exportOrderList(HttpServletResponse response,HttpServletRequest request){
        List<User> exportList = getUserList();
        try {
            String excelName = "用户信息表";
            response.setHeader("content-Type","application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment;filename="+ URLEncoder.encode(excelName , "UTF-8") + ".xls");
            response.setCharacterEncoding("UTF-8");
            Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(null, excelName), User.class, exportList);
            workbook.write(response.getOutputStream());
        } catch (IOException e) {
            return "exportOrderList=====ERROR=====";
        }
 
        return null;
    }
 
    private List<User> getUserList(){
        List<User> resultList = new ArrayList<>();
        User user = new User();
        user.setUserId(1);
        user.setUserName("李玉刚");
        user.setAge(32);
        user.setUserAddress("新贵妃醉酒");
        user.setSex(20);
        User user1 = new User();
        user1.setUserId(2);
        user1.setUserName("刘德华");
        user1.setAge(59);
        user1.setUserAddress("冰雨");
        user1.setSex(10);
        resultList.add(user);
        resultList.add(user1);
        return resultList;
    }

3.导出截图

2.动态表头导出

1.创建一个表头实体

public class DynamicTablePo implements Serializable{
 
    private static final long serialVersionUID = 8991244829305414889L;
 
    //表头名字
    private String filedShowName;
 
    //表头key值和查询出来的数据的实体相对应
    private String filedCode;
 
    //表头顺序
    private Integer orderNum;
 
    //字段数据类型
    private Integer dataType;
}

2.创建想要的表头集合（这里是实现动态表头的定义）

    private List<DynamicTablePo> getTalePoList() {
        List<DynamicTablePo> resultList = new ArrayList<>();
        DynamicTablePo tablePo = new DynamicTablePo();
        tablePo.setFiledShowName("用户名称");
        tablePo.setFiledCode("userName");
        tablePo.setOrderNum(1);
        tablePo.setDataType(0);
        DynamicTablePo tablePo1 = new DynamicTablePo();
        tablePo1.setFiledShowName("用户地址");
        tablePo1.setFiledCode("userAddress");
        tablePo1.setOrderNum(2);
        tablePo1.setDataType(0);
        resultList.add(tablePo);
        resultList.add(tablePo1);
        return resultList;
    }

3.controller层代码

@GetMapping("/moveExport")
    public String moveExport(HttpServletResponse response,HttpServletRequest request){
 
        List<User> exportList = getUserList();
        List<DynamicTablePo> tablePoList = getTalePoList();
 
        List<ExcelExportEntity> beanList = new ArrayList<ExcelExportEntity>(tablePoList.size());
        for (DynamicTablePo tablePo : tablePoList){
            ExcelExportEntity entity = new ExcelExportEntity();
            entity.setName(tablePo.getFiledShowName());
            entity.setKey(tablePo.getFiledCode());
            entity.setOrderNum(tablePo.getOrderNum());
            if (tablePo.getDataType() == 1){//TODO 这块控制一下，是不是要写成数值型，默认
                entity.setType(BaseEntityTypeConstants.DOUBLE_TYPE);
            }
            beanList.add(entity);
        }
        try {
            String excelName = "用户信息表";
            ExportParams exportParams = new ExportParams(excelName, "sheet1");
            Workbook workbook = ExcelExportUtil.exportExcel(exportParams, beanList , exportList);
            response.setHeader("content-Type","application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment;filename="+ URLEncoder.encode(excelName + "导出表", "UTF-8") + ".xls");
            response.setCharacterEncoding("UTF-8");
            workbook.write(response.getOutputStream());
            workbook.close();
        } catch (FileNotFoundException e) {
            return "导出选中的单据 exportOrderList=====ERROR=====";
        } catch (IOException e) {
            return "导出选中的单据 exportOrderList=====ERROR=====";
        }
 
        return null;
    }

重点代码：ExcelExportUtil.exportExcel(exportParams, beanList , exportList);

beanList ：动态表头集合

exportList：动态数据集合

4.导出截图