通过main方法调用service或dao

时间:2022-05-23 张童瑶人气:0

如何通过main方法调用service或dao

大多数情况下，我们使用springboot是创建一个web项目，然后通过接口访问，但是也有特殊情况，比如线上跑着的web项目，有一些特殊的数据，需要经过计算导入到数据库，这个时候，我们可能需要原来的web项目中的一些service，dao才辅助操作，但是又不能在服务端新开接口。我们通过springboot的main方法执行这些操作。

此时，service和到需要通过上下文获得。

创建类，并复制下面代码

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
/**
 * 普通类调用Spring bean对象：
 * 注意：此类需要放到App.java同包或者子包下才能被扫描，否则失效。
 */
@Component
public class SpringUtil implements ApplicationContextAware{
    private static ApplicationContext applicationContext = null;
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(SpringUtil.applicationContext == null){
            SpringUtil.applicationContext  = applicationContext;
        }
    }
    //获取applicationContext
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }
    //通过name获取 Bean.
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }
    //通过class获取Bean.
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }
    //通过name,以及Clazz返回指定的Bean
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }
}

再创建TestApp方法

必须跟SpringUtilfa放到同一目录下

package com.example.demo.test2;
import com.example.demo.controller.Aqjg_thePeriodController;
import com.example.demo.mapper.AppAqjgTaskMapper;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import java.util.List;
import java.util.Map;
@SpringBootApplication
@MapperScan(basePackages = {"com.example.demo.mapper"})
public class TestApp {
    public static void main(String[] args) {
        SpringApplication.run(TestApp.class, args);
        ApplicationContext context = SpringUtil.getApplicationContext();
        Aqjg_thePeriodController aqjg_thePeriodController = new Aqjg_thePeriodController();
        AppAqjgTaskMapper appAqjgTaskMapper = context.getBean(AppAqjgTaskMapper.class); //你的dao或service
        List<Map<String,Object>> list = appAqjgTaskMapper.getTestSmsData();
        System.out.println("完成");
    }
}

在普通类中获取service或者dao

手动创建工具类

package com.lhw.locktest.util;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
@Component
public class TherdUtil implements ApplicationContextAware {
    private static ApplicationContext applicationContext = null;
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if (TherdUtil.applicationContext == null) {
            TherdUtil.applicationContext = applicationContext;
        }
    }
    //获取applicationContext
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }
    //通过name获取 Bean.
    public static Object getBean(String name) {
        return getApplicationContext().getBean(name);
    }
    //通过class获取Bean.
    public static <T> T getBean(Class<T> clazz) {
        return getApplicationContext().getBean(clazz);
    }
    //通过name,以及Clazz返回指定的Bean
    public static <T> T getBean(String name, Class<T> clazz) {
        return getApplicationContext().getBean(name, clazz);
    }
}

调用配置类

  UserService userService = TherdUtil.getBean(UserService.class);
  userService.decStockNoLock();

以上为个人经验，希望能给大家一个参考，也希望大家多多支持。

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