服务构造静态引用

构造静态引用

我们有些静态工具类中如果需要使用到service，这个时候引入就会有问题，如下所示

package com.tthk.inland.ticket.core.utils.statistic;

import com.tthk.inland.ticket.core.utils.redis.RedisUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class StaticRedisTemplateComponet {

    @Autowired
    private RedisUtil redisUtil;

    private static void test(){
        redisUtil.get("test");
    }
}

有时候我们在静态方法里面无法使用@Autowired引入的bean，因为有加载顺序问题会报错

// 这一行的 redisUtil 会爆红
redisUtil.get("test");

这个时候我们就需要单独去实例化这个引用，并且变成默认的静态方法如下：

package com.tthk.inland.ticket.core.utils.statistic;

import com.tthk.inland.ticket.core.configurations.activemq.QueueProducerService;
import com.tthk.inland.ticket.core.utils.redis.RedisUtil;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;

@Component
@RequiredArgsConstructor
public class StaticRedisTemplateComponet {

    private final QueueProducerService queueProducerService;

    private final RedisUtil redisUtil;

    private static QueueProducerService staticQueueProducerService;

    private static RedisUtil staticRedisUtil;

    @PostConstruct
    public void init() {
        staticQueueProducerService = this.queueProducerService;
        staticRedisUtil = this.redisUtil;
    }

    public static RedisUtil getStaticRedisTenService() {
        return staticRedisUtil;
    }

    public static QueueProducerService getStaticQueueProducerService() {
        return staticQueueProducerService;
    }
}

这样我们就可以用get方法来进行获取

StaticRedisTemplateComponet.getStaticRedisTenService().get("tt_interface_switch",10);

第二种方法，比较原始@Autowired会根据bean里面注册的name来进行搜索，如果获取到了，则进行赋值

private static ZXSearchNewService_new zxSearchNewService_new;
private static QueueProducerService messageService;

@Autowired
public zxSearch(QueueProducerService queueProducerService,ZXSearchNewService_new zxSearchNewService_new) {
    zxSearch.zxSearchNewService_new = zxSearchNewService_new;
    zxSearch.messageService = queueProducerService;
}