如何再程序启动时初始化数据活执行其它业务

Posted 2023-02-24 TGB-Earnest

方式一

@Component
public class PostConstructInit 
    /**
     * 如何再程序启动时初始化数据活执行其它业务
     *
     * @PostConstruct 用来修饰一个非静态的void()方法，当bean创建完成的时候，会仅且执行一次
     * 作用：初始化数据
     * 例如：加载数据库中的数据字典 缓存 到redis中
     */
    @PostConstruct
    public void init()
        System.out.println("PostConstruct   进行......");
    

方式二

@Component
public class InitializingBeanInit implements InitializingBean 
    @Override
    public void afterPropertiesSet() throws Exception 
        System.out.println("实现InitializingBean ------>");
    

方式三

@Component
public class CommandLineInit implements CommandLineRunner 
    @Override
    public void run(String... args) throws Exception 
        System.out.println("实现CommandLineRunner - ---- >进行");
    

例子

    @PostConstruct
    private void initDicInfosourceData() 
        List<CrmDictionary> list = crmDictionaryMapper.getAllDict();
        Set keys;
        if (list.size()>0)
            // 删除缓存数据
            keys = redisTemplate.keys(RedisKeyUtil.getDictionaryHashKey("*"));
            redisTemplate.delete(keys);
            Map<String, List<CrmDictionary>> listMap = list.stream().collect(Collectors.groupingBy(CrmDictionary::getType));
            String type;
            Map<String, String> map = new HashMap<>();
            for (Map.Entry<String, List<CrmDictionary>> entry : listMap.entrySet()) 
                type = entry.getKey();
                map.clear();
                entry.getValue().stream().forEach(e -> 
                    map.put( e.getKey(), e.getValue());
                    map.put(e.getValue(), e.getKey());
                );
                redisTemplate.opsForHash().putAll(RedisKeyUtil.getDictionaryHashKey(type), map);
            
        else 
            log.warn("=================crm_dictionary字典数据初始化时为空===================");
        
        // 删除缓存数据
        keys = redisTemplate.keys(RedisKeyUtil.getDictionaryListKey("*"));
        redisTemplate.delete(keys);