SpringBoot中的main方法注入service
一、SpringBoot中的main方法注入service
在springboot中使用main方法常规无法注入service,因为以后也可能会有这种情况,所以采取工具类的方式进行,该工具类为固定写法,直接复制就行
@Component public class SpringContextUtil implements ApplicationContextAware { private static ApplicationContext applicationContext = null; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { if (SpringContextUtil.applicationContext == null) { SpringContextUtil.applicationContext = applicationContext; } } public static ApplicationContext getApplicationContext() { return applicationContext; } public static Object getBean(String name) { return getApplicationContext().getBean(name); } public static <T> T getBean(Class<T> clazz) { return getApplicationContext().getBean(clazz); } public static <T> T getBean(String name, Class<T> clazz) { return getApplicationContext().getBean(name, clazz); } }
然后在需要注入的地方,创建静态service
private static Service service;
然后在需要使用的main方法中:
public static void main(String[] args) { SpringApplication.run(**Application.class,args); ApplicationContext applicationContext = SpringContextUtil.getApplicationContext(); service = applicationContext.getBean(**Service.class); }
二、springboot 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"); } }
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我们。
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