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實際開發中我們經常需要通過spring上下文獲取一些配置信息，本文闡述springboot應用獲取spring上下文的幾種方式。 方式一：實現ApplicationContextAware接口import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
/**
* 實現ApplicationContextAware接口設置applicationContext
* 提供static方法供調用者使用，不要求使用者受spring容器管理
*/
@Component
public class SpringContextUtil1 implements ApplicationContextAware {
public static ApplicationContext applicationContext;
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
SpringContextUtil1.applicationContext = applicationContext;
}
public static ApplicationContext getApplicationContext() {
return SpringContextUtil1.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);
}
} 方式二：非static方法版import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
/**
* 實現ApplicationContextAware接口設置applicationContext
* 如果使用者也是被spring管理的bean則可以使用注入的方式使用,而非調用static方法
*/
@Component
public class SpringContextUtil2 implements ApplicationContextAware {
public ApplicationContext applicationContext;
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext;
}
public ApplicationContext getApplicationContext() {
return this.applicationContext;
}
public Object getBean(String name) {
return applicationContext.getBean(name);
}
public <T> T getBean(Class<T> clazz) {
return applicationContext.getBean(clazz);
}
public <T> T getBean(String name, Class<T> clazz) {
return getApplicationContext().getBean(name, clazz);
}
}
@Component
public class ContextUser{
/**
* 使用者直接注入
*/
@Autowired
public SpringContextUtil2 springContextUtil2;
} 方式三：在springboot引導類里設置import org.springframework.context.ApplicationContext;
/**
* 在springboot引導類里設置applicationContext
* 工具類無需實現ApplicationContextAware接口
*/
public class SpringContextUtil3 {
public static ApplicationContext applicationContext;
public static ApplicationContext getApplicationContext() {
return SpringContextUtil3.applicationContext;
}
public static void setApplicationContext(ApplicationContext applicationContext) {
SpringContextUtil3.applicationContext = applicationContext;
}
public static Object getBean(String name) {
return getApplicationContext().getBean(name);
}
public static Object getBean(Class<?> requiredType) {
return getApplicationContext().getBean(requiredType);
}
public static <T> T getBean(String name, Class<T> clazz) {
return getApplicationContext().getBean(name, clazz);
}
}
//在springboot引導類里設置applicationContext
@SpringBootApplication
public class MainApplication {
public static void main(String[] args) {
ConfigurableApplicationContext context = SpringApplication.run(MainApplication.class, args);
SpringContextUtil3.setApplicationContext(context);
}
} 方式四：直接注入ApplicationContext@Component
public class ContextUser{
/**
* 在需要使用上下文的地方直接注入(前提：使用者受spring容器管理)
*/
@Autowired
public ApplicationContext applicationContext;
} 怎么樣，第四種方式是不是很easy？！
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