SpringBoot整合Redis报错java.lang.NullPointerException

Question

package com.bulldozer.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * redis配置类
 * @author Abbott.liu
 * @date   2021年5月7日
 */
@Configuration
public class RedisConfig {

    @Bean
    @SuppressWarnings("all")

    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {

        RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();

        template.setConnectionFactory(factory);

        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);

        ObjectMapper om = new ObjectMapper();

        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);

        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);

        jackson2JsonRedisSerializer.setObjectMapper(om);

        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();

        // key采用String的序列化方式

        template.setKeySerializer(stringRedisSerializer);

        // hash的key也采用String的序列化方式

        template.setHashKeySerializer(stringRedisSerializer);

        // value序列化方式采用jackson

        template.setValueSerializer(jackson2JsonRedisSerializer);

        // hash的value序列化方式采用jackson

        template.setHashValueSerializer(jackson2JsonRedisSerializer);

        template.afterPropertiesSet();

        return template;

    }

}

package com.bulldozer.utils;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;

/**
 * Redis工具类
 * @author Abbott.liu
 * @date   2021年5月7日
 */

@Component
public final class RedisUtil {
    @Autowired
    private RedisTemplate<String, Object> redisTemplate;

    /**
     * 普通缓存放入
     * @param key 键
     * @param value 值
     * @return true成功 false失败
     */
    public boolean set(String key, Object value) {
        try {
            ValueOperations<String, Object> vo = redisTemplate.opsForValue();
            vo.set(key, value);
            redisTemplate.expire(key, 1, TimeUnit.HOURS); // 这里指的是1小时后失效
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    public static void main(String[] args) {
        RedisUtil redisUtil = new RedisUtil();
        redisUtil.set("abc", "123");
    }
}

又学习了一下

@Autowired
    public StringRedisTemplate stringRedisTemplate;
    
@RequestMapping(value="/v1/refresh/time", method={ RequestMethod.POST })
    public ResponseResult countNum() {
        String code = "500";
        String message = "FAIL";
        String detail = "selectBulldozerInfo";
        ResponseResult responseResult = new ResponseResult();
        String userNum = stringRedisTemplate.opsForValue().get("timeRefreshWaring");
        if(StringUtils.isNull(userNum)){
            String dateStr = DateUtils.dateToString(new Date());
            stringRedisTemplate.opsForValue().set("timeRefreshWaring", dateStr);
            code = "200";
            message = "SUCCESS";
            detail = "refresh success";
            JSONObject jsonResultObject = new JSONObject();
            jsonResultObject.put("timeRefreshWaring", dateStr);
            responseResult.setData(jsonResultObject);
        }
        responseResult.setCode(code);
        responseResult.setMessage(message);
        responseResult.setDetail(detail);
        return responseResult;
    }
    

Answer 1

redisTemplate怎么来的，spring boot注入的。
手动new RedisUtil();，算spring boot注入？当然不算。

Answer 2

。。。。。
这为啥空还不知道吗？