1.配置pom.xml

        <dependency>
            <groupId>com.tencentcloudapi</groupId>
            <artifactId>tencentcloud-sdk-java</artifactId>
            <version>3.1.270</version><!-- 注：这里只是示例版本号（可直接使用），可获取并替换为 最新的版本号，注意不要使用4.0.x版本（非最新版本） -->
        </dependency>

2.随机生成二维码类

package com.carolin_violet.travel_system.utils;

import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Random;

/**
 * 获取随机数
 *
 */
public class RandomUtil {

	private static final Random random = new Random();

	private static final DecimalFormat fourdf = new DecimalFormat("0000");

	private static final DecimalFormat sixdf = new DecimalFormat("000000");

	public static String getFourBitRandom() {
		return fourdf.format(random.nextInt(10000));
	}

	public static String getSixBitRandom() {
		return sixdf.format(random.nextInt(1000000));
	}

	/**
	 * 给定数组，抽取n个数据
	 * @param list
	 * @param n
	 * @return
	 */
	public static ArrayList getRandom(List list, int n) {

		Random random = new Random();

		HashMap<Object, Object> hashMap = new HashMap<Object, Object>();

		// 生成随机数字并存入HashMap
		for (int i = 0; i < list.size(); i++) {

			int number = random.nextInt(100) + 1;

			hashMap.put(number, i);
		}

		// 从HashMap导入数组
		Object[] robjs = hashMap.values().toArray();

		ArrayList r = new ArrayList();

		// 遍历数组并打印数据
		for (int i = 0; i < n; i++) {
			r.add(list.get((int) robjs[i]));
			System.out.print(list.get((int) robjs[i]) + "\t");
		}
		System.out.print("\n");
		return r;
	}
}

3. 使用官方的示例api稍微修改下

	// code为自己随机生成的二维码,phone为需要发送验证码的手机号
  @Override
    public boolean send(String code, String phone) {
        try {
            Credential cred = new Credential("{腾讯云访问密钥id}", "{腾讯云访问密钥密码}");

            HttpProfile httpProfile = new HttpProfile();
            httpProfile.setReqMethod("GET");

            httpProfile.setEndpoint("sms.tencentcloudapi.com");
            ClientProfile clientProfile = new ClientProfile();

            SmsClient client = new SmsClient(cred, "ap-nanjing",clientProfile);
            SendSmsRequest req = new SendSmsRequest();

            String sdkAppId = "1400679413";
            req.setSmsSdkAppId(sdkAppId);

            String signName = "{短信服务模板签名}";
            req.setSignName(signName);

            String templateId = "{短信服务模板id}";
            req.setTemplateId(templateId);

            String[] templateParamSet = {code};
            req.setTemplateParamSet(templateParamSet);

            String[] phoneNumberSet = {phone};
            req.setPhoneNumberSet(phoneNumberSet);

            SendSmsResponse res = client.SendSms(req);

            System.out.println(SendSmsResponse.toJsonString(res));
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

Q.E.D.