Spring:ApplicationContextAware获取Spring上下文
1 前言
实现ApplicationContextAware接口,即可通过实现setApplicationContext方法,获取Spring的上下文,同时使用@Component注解即可生效。
2 使用
根据Spring上下文,获取bean的工具类封装:
package com.xiaoxu.crawler.utils;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.lang.NonNull;
import org.springframework.stereotype.Component;
/**
* @author xiaoxu
* @date 2022-12-31 9:08
* crawlerJ:com.xiaoxu.crawler.utils.ApplicationContextUtil
*/
@Component
public class ApplicationContextUtil implements ApplicationContextAware {
private ApplicationContext applicationContext;
public ApplicationContext getApplicationContext() {
return applicationContext;
}
@Override
public void setApplicationContext(@NonNull ApplicationContext applicationContext) throws BeansException {
System.out.println("我是applicationContextAware:");
this.applicationContext = applicationContext;
}
public <T> T getBean(Class<T> clazz){
T bean = null;
try {
bean = getApplicationContext().getBean(clazz);
} catch (BeansException e) {
ExcpUtils.throwExp("get bean by class fail: "+e.getMessage());
}
return bean;
}
public Object getBean(String name){
Object bean = null;
try {
bean = getApplicationContext().getBean(name);
} catch (BeansException e) {
ExcpUtils.throwExp("get bean by name fail: "+e.getMessage());
}
return bean;
}
public <T> T getBean(String name, Class<T> clazz){
T bean = null;
try {
bean = getApplicationContext().getBean(name, clazz);
} catch (BeansException e) {
ExcpUtils.throwExp("get bean by name and class fail: "+e.getMessage());
}
return bean;
}
}
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