java通過類反射實現判斷excel的單元格內容不爲空

show me the code, 上碼！

import com.alibaba.excel.annotation.ExcelProperty;
import com.example.demo.vo.Student;

import java.beans.PropertyDescriptor;
import java.io.UnsupportedEncodingException;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

/**
 * 通過反射實現判斷excel的單元格內容不爲空
 *
 * @author myssen
 * @date 2021/6/17 9:22
 */
public class Test0617 {

    public static void main(String[] args) throws UnsupportedEncodingException {
        List<Student> list = new ArrayList<>();
        Student student = new Student();
        student.setName("劉備");
        student.setSex("男");
        student.setAge(10);
        list.add(student);
        Student student2 = new Student();
        student2.setName("關羽");
        student2.setSex("男");
        student2.setAge(10);
        list.add(student2);

        for (Student row : list) {
            try {
                String message = checkNotBlank(row);
                if (!"".equals(message)) {
                    System.out.println("錯誤提示：" + message);
                }else{
                    // doSomething
                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }

        }

    }

    /**
     * excel必填字段不爲空檢查
     *
     * @param row
     * @return
     * @throws Exception
     */
    public static String checkNotBlank(Student row) throws Exception {
        Field[] fields = Student.class.getDeclaredFields();
        String message = "";
        for (Field field : fields) {
            PropertyDescriptor descriptor = new PropertyDescriptor(field.getName(), Student.class);
            Method getMethod = descriptor.getReadMethod();
            String value = getMethod.invoke(row).toString();
            Annotation[] annotations = field.getAnnotations();
            boolean flagNull = false;
            for (Annotation annotation : annotations) {
                if (annotation.annotationType().equals(ExcelProperty.class)) {
                    String columnName = ((ExcelProperty) annotation).value()[0];
                    if (columnName.contains("必填")) {
                        if (value == null || "".equals(value)) {
                            message = columnName;
                            flagNull = true;
                            break;
                        }
                    }
                }
            }
            if (flagNull) {
                break;
            }
        }

        return message;
    }


}

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