springboot实现Excel读取

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.13</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.13</version>
        </dependency>

import com.example.springbatch.xxkfz.annotation.ExcelField;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

/**
 * @author xxkfz
 * Excel工具类
 */

@Slf4j
public class ExcelUtils {

    private HSSFWorkbook workbook;

    public ExcelUtils(String fileDir) {
        File file = new File(fileDir);
        try {
            workbook = new HSSFWorkbook(new FileInputStream(file));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 读取Excel数据
     *
     * @param sheetName
     * @param object
     * @return
     */
    public List readFromExcelData(String sheetName, Object object) {
        List result = new ArrayList();

        // 获取该对象的class对象
        Class class_ = object.getClass();

        // 获得该类的所有属性
        Field[] fields = class_.getDeclaredFields();

        // 读取excel数据  获得指定的excel表
        HSSFSheet sheet = workbook.getSheet(sheetName);

        // 获取表格的总行数
        int rowCount = sheet.getLastRowNum() + 1; // 需要加一
        if (rowCount < 1) {
            return result;
        }

        // 获取表头的列数
        int columnCount = sheet.getRow(0).getLastCellNum();

        // 读取表头信息,确定需要用的方法名---set方法
        // 用于存储方法名
        String[] methodNames = new String[columnCount]; // 表头列数即为需要的set方法个数

        // 用于存储属性类型
        String[] fieldTypes = new String[columnCount];

        // 获得表头行对象
        HSSFRow titleRow = sheet.getRow(0);

        // 遍历表头列
        for (int columnIndex = 0; columnIndex < columnCount; columnIndex++) {

            // 取出某一列的列名
            String colName = titleRow.getCell(columnIndex).toString();
/*
            // 将列名的首字母字母转化为大写
            String UColName = Character.toUpperCase(colName.charAt(0)) + colName.substring(1, colName.length());

            // set方法名存到methodNames
            methodNames[columnIndex] = "set" + UColName;
*/
            //
            String fieldName = fields[columnIndex].getName();
            String UpperFieldName = Character.toUpperCase(fieldName.charAt(0)) + fieldName.substring(1, fieldName.length());
            methodNames[columnIndex] = "set" + UpperFieldName;

            // 遍历属性数组
            for (int i = 0; i < fields.length; i++) {

                // 获取属性上的注解name值
                String name = fields[i].getAnnotation(ExcelField.class).name();

                // 属性与表头相等
                if (Objects.nonNull(name) && colName.equals(name)) {
                    //  将属性类型放到数组中
                    fieldTypes[columnIndex] = fields[i].getType().getName();
                }
            }
        }

        // 逐行读取数据 从1开始 忽略表头
        for (int rowIndex = 1; rowIndex < rowCount; rowIndex++) {
            // 获得行对象
            HSSFRow row = sheet.getRow(rowIndex);
            if (row != null) {
                Object obj = null;
                // 实例化该泛型类的对象一个对象
                try {
                    obj = class_.newInstance();
                } catch (Exception e1) {
                    e1.printStackTrace();
                }

                // 获得本行中各单元格中的数据
                for (int columnIndex = 0; columnIndex < columnCount; columnIndex++) {
                    String data = row.getCell(columnIndex).toString();
                    // 获取要调用方法的方法名
                    String methodName = methodNames[columnIndex];

                    obj = this.valueConvert(fieldTypes[columnIndex], methodName, class_, obj, data);
                }
                result.add(obj);
            }
        }
        return result;
    }

    /**
     * @param fieldType  字段类型
     * @param methodName 方法名
     * @param class_
     * @param data
     * @return
     */
    private Object valueConvert(String fieldType, String methodName, Class class_, Object obj, String data) {
        Method method = null;
        if (Objects.isNull(fieldType) || Objects.isNull(methodName) || Objects.isNull(class_) || Objects.isNull(obj)) {
            return obj;
        }
        try {
            switch (fieldType) {
                case "java.lang.String":
                    method = class_.getDeclaredMethod(methodName, String.class);
                    method.invoke(obj, data); // 执行该方法
                    break;
                case "java.lang.Integer":
                    method = class_.getDeclaredMethod(methodName, Integer.class);
                    Integer value = Integer.valueOf(data);
                    method.invoke(obj, value); // 执行该方法
                    break;
                case "java.lang.Boolean":
                    method = class_.getDeclaredMethod(methodName, Boolean.class);
                    Boolean booleanValue = Boolean.getBoolean(data);
                    method.invoke(obj, booleanValue); // 执行该方法
                    break;
                case "java.lang.Double":
                    method = class_.getDeclaredMethod(methodName, Double.class);
                    double doubleValue = Double.parseDouble(data);
                    method.invoke(obj, doubleValue); // 执行该方法
                    break;
                case "java.math.BigDecimal":
                    method = class_.getDeclaredMethod(methodName, BigDecimal.class);
                    BigDecimal bigDecimal = new BigDecimal(data);
                    method.invoke(obj, bigDecimal); // 执行该方法
                    break;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return obj;
    }
}

import java.lang.annotation.*;

/**
 * @author xxkfz
 */
@Target({ElementType.METHOD, ElementType.FIELD, ElementType.TYPE}) //注解放置的目标位置,METHOD是可注解在方法级别上
@Retention(RetentionPolicy.RUNTIME) //注解在哪个阶段执行
@Documented
public @interface ExcelField {
    String name() default "";
}

@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
public class ExcelFileField {

    @ExcelField(name = "id")
    private String id;

    @ExcelField(name = "code")
    private String code;

    @ExcelField(name = "type")
    private String type;

    @ExcelField(name = "version")
    private String version;
}

 @Test
    void readExcel() {
        ExcelUtils utils = new ExcelUtils("E:/test.xls");
        ExcelFileField interfaceField = new ExcelFileField();
        List list = utils.readFromExcelData("sheet1", interfaceField);
        for (int i = 0; i < list.size(); i++) {
            ExcelFileField item = (ExcelFileField) list.get(i);
            System.out.println(item.toString());
        }
    }