1、springboot启动类实现接口ApplicationListener<ContextRefreshedEvent>，实现方法onApplicationEvent，初始化上下文
package test.projectTest;
import org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration;
import org.springframework.boot.system.ApplicationPidFileWriter;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import test.projectTest.util.SpringContextUtil;
@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class,DataSourceTransactionManagerAutoConfiguration.class, MybatisAutoConfiguration.class})
@SpringBootApplication(scanBasePackages={"test.projectTest"})
public class TestApplication implements ApplicationListener<ContextRefreshedEvent>
{
public static void main( String[] args )
{
SpringApplication application = new SpringApplication(TestApplication.class);
application.addListeners(new ApplicationPidFileWriter());
application.run(args);
System.out.println( "启动成功" );
}
@Override
public void onApplicationEvent(ContextRefreshedEvent event) {
SpringContextUtil.setApplicationContext(event.getApplicationContext());
}
}
2.SpringContextUtil工具类初始化ApplicationContext applicationContext
package test.projectTest.util;
import org.springframework.context.ApplicationContext;
/**
* 获取spring容器，以访问容器中定义的其他bean
*/
public class SpringContextUtil{
//spring上下文
private static ApplicationContext applicationContext;
/**
* 实现ApplicationCon<i style="color:transparent">本文来源gaodai$ma#com搞$$代**码)网8</i>textAware接口的回调方法，设置上下文环境
* @param applicationContext
*/
public static void setApplicationContext(ApplicationContext applicationContext){
if(null==SpringContextUtil.applicationContext)
SpringContextUtil.applicationContext=applicationContext;
}
public static ApplicationContext getApplicationContext(){
return applicationContext;
}
/**
* 通过name获取 Bean.
*
* @param name
* @return
*/
public static Object getBean(String name) {
return getApplicationContext().getBean(name);
}
/**
* 通过name获取 Bean.
*
* @param clazz
* @return
*/
public static <T> T getBean(Class<T> clazz) {
return getApplicationContext().getBean(clazz);
}
/**
* 通过name,以及Clazz返回指定的Bean
*
* @param name
* @param clazz
* @return
*/
public static <T> T getBean(String name, Class<T> clazz) {
return getApplicationContext().getBean(name, clazz);
}
}
3.获取bean
package test.projectTest.util;
import test.projectTest.mapper.slave.DailyDataMapper;
public class TestUtil{
private static DailyDataMapper dailyDataMapper;
static{//手动注入bean
if(dailyDataMapper==null){
dailyDataMapper = (DailyDataMapper)SpringContextUtil.getBean("dailyDataMapper");
}
}
public static void test(){
dailyDataMapper.selectByPrimaryKey(1);
}
}
补充：springboot中bean的实例化和属性注入过程
springboot版本（2.0.4 RELEASE）
大致描述springboot中bean的实例化和属性注入过程流程
1） 在某一时刻Spring调用了Bean工厂的getBean(beanName)方法。beanName可能是simpleController,或者simpleService，simpleDao，顺序没关系（因为后面会有依赖关系的处理）。我们假设simpleController吧
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转载请注明原文链接：springboot 实现bean手动注入操作
转载请注明原文链接：springboot 实现bean手动注入操作
