src/main/java/com/utils/CommonUtil.java

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package com.utils;

import java.util.Random;
import org.springframework.stereotype.Component;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Cell;
import java.text.DecimalFormat;
import java.util.Objects;

@Component
public class CommonUtil {
	/**
     * 获取随机字符串
     *
     * @param num
     * @return
     */
    public static String getRandomString(Integer num) {
        String base = "abcdefghijklmnopqrstuvwxyz0123456789";
        Random random = new Random();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < num; i++) {
            int number = random.nextInt(base.length());
            sb.append(base.charAt(number));
        }
        return sb.toString();
    }

	/**
	 * 获取随机验证码
	 *
	 * @param num
	 * @return
	 */
	public static String getRandomNumber(Integer num) {
	    String base = "0123456789";
	    Random random = new Random();
	    StringBuffer sb = new StringBuffer();
	    for (int i = 0; i < num; i++) {
	        int number = random.nextInt(base.length());
	        sb.append(base.charAt(number));
	    }
	    return sb.toString();
	}

    public static String getCellValue(Cell cell) {
        String resultValue = "";
        // 判空
        if (Objects.isNull(cell)) {
            return resultValue;
        }

        // 拿到单元格类型
        int cellType = cell.getCellType();
        switch (cellType) {
            // 字符串类型
            case Cell.CELL_TYPE_STRING:
                resultValue = StringUtils.isEmpty(cell.getStringCellValue()) ? "" : cell.getStringCellValue().trim();
                break;
            // 布尔类型