Java中EasyExcel的使用方式

<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>easyexcel</artifactId>
     <version>2.2.8</version>
</dependency>

<dependency>
     <groupId>org.apache.poi</groupId>
     <artifactId>poi</artifactId>
     <version>3.17</version>
</dependency>
<dependency>
     <groupId>org.apache.poi</groupId>
     <artifactId>poi-ooxml</artifactId>
     <version>3.17</version>
</dependency>

@Data
public class UserData {
​
  @ExcelProperty(index = 0, value = "姓名")
  private String username;
​
  @ExcelProperty(index = 1, value = "年龄")
  private int age;
​
  @DateTimeFORMat("yyyy-MM-dd")
  @ExcelProperty(index = 2, value = "生日")
  private Date birthday;
}

public class EasyExcelDemo {
  public static void main(String[] args) {
    // 实现excel写操作
    //1.设置写入文件夹地址和excel文件名称
    String fileName = "/Users/zzs/temp/excel/write.xlsx";
    //调用easyExcel里面的方法实现写操作
    //2个参数，第一个参数是文件名称，第二个参数是实体类
    EasyExcel.write(fileName, UserData.class).sheet("学生信息表").doWrite(getData());
  }
​
  //创建方法返回list集合
  public static List<UserData> getData() {
    List<UserData> list = new ArrayList<>();
​
    UserData userData1 = new UserData();
    userData1.setUsername("张三");
    userData1.setAge(22);
    userData1.setBirthday(formatDate("2000-10-11"));
    list.add(userData1);
​
    UserData userData2 = new UserData();
    userData2.setUsername("李四");
    userData2.setAge(23);
    userData2.setBirthday(formatDate("1999-5-3"));
    list.add(userData2);
    return list;
  }
  public static Date formatDate(String birthday) {
    SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd");
    try {
      return sdf.parse(birthday);
    } catch (ParseException e) {
      e.printStackTrace();
    }
    return null;
  }
}

public class ExcelListener extends AnalysisEventListener<UserData> {
  
  @Override
  public void invoke(UserData data, AnalysisContext analysisContext) {
    System.out.println("****" + data);
  }

  
  @Override
  public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {
    System.out.println("表头" + headMap);
  }
  
  @Override
  public void doAfterAllAnalysed(AnalysisContext analysisContext) {
    System.out.println("读取Excel完毕");
  }
}

public class EasyExcelReadDemo {

  public static void main(String[] args) {
    // 实现excel写操作
    //1.设置写入文件夹地址和excel文件名称
    String fileName = "/Users/zzs/temp/excel/write.xlsx";
    //调用easyExcel里面的方法实现写操作
    //2个参数，第一个参数是文件名称，第二个参数是实体类
    EasyExcel.read(fileName, UserData.class, new ExcelListener()).sheet().doRead();
  }
}

import com.alibaba.excel.converters.Converter;
import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.GlobalConfiguration;
import com.alibaba.excel.metadata.property.ExcelContentProperty;

public class SexConverter implements Converter<Integer> {

    @Override
    public Class<Integer> supportJavaTypeKey() {
        return Integer.class;
    }

    @Override
    public CellDataTypeEnum supportExcelTypeKey() {
        return CellDataTypeEnum.STRING;
    }

    @Override
    public Integer convertToJavaData(CellData cellData, ExcelContentProperty excelContentProperty, GlobalConfiguration globalConfiguration) throws Exception {
        return "男".equals(cellData.getStringValue()) ? 1 : 0;
    }

    @Override
    public CellData<String> convertToExcelData(Integer integer, ExcelContentProperty excelContentProperty, GlobalConfiguration globalConfiguration) throws Exception {
        return new CellData<>(integer.equals(1) ? "男" : "女");
    }
}

@ExcelProperty(value = "性别", converter = SexConverter.class)
private Integer sex;

@ExcelProperty(value = "体重KG")
@NumberFormat("0.##") // 会以字符串形式生成单元格，要计算的列不推荐
private BigDecimal weight;

@ContentStyle(dataFormat = 2)
private BigDecimal weight2;

@Data
@ToString
@AllArgsConstructor
@NoArgsConstructor  // 一定要有无参构造方法
@ExcelIgnoreUnannotated
public class UserData {
    .....
}

@ExcelIgnore // 该字段不生成excel
private String remark;

    EasyExcel.write(fileName, UserData.class).sheet("学生信息表").excludeColumnFiledNames(Arrays.asList("remark")).doWrite(getData());