Java SpringBoot 中,动态执行 bean 对象中的方法
根据不同的条件,调用不同的 bean 对象,执行对象中的方法
SpringUtils 工具类
package com.vipsoft.web.utils;
import cn.hutool.core.util.ArrayUtil;
import org.springframework.aop.framework.AopContext;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
/**
* Spring工具类 方便在非 Spring 管理环境中获取bean
*
*/
@Component
public final class SpringUtils implements BeanFactoryPostProcessor, ApplicationContextAware {
/**
* Spring 应用上下文环境
*/
private static ConfigurableListableBeanFactory beanFactory;
private static ApplicationContext applicationContext;
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
SpringUtils.beanFactory = beanFactory;
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
SpringUtils.applicationContext = applicationContext;
}
/**
* 获取对象
*
* @param name
* @return Object 一个以所给名字注册的bean的实例
* @throws BeansException
*/
@SuppressWarnings("unchecked")
public static <T> T getBean(String name) throws BeansException {
return (T) beanFactory.getBean(name);
}
/**
* 获取类型为requiredType的对象
*
* @param clz
* @return
* @throws BeansException
*/
public static <T> T getBean(Class<T> clz) throws BeansException {
T result = (T) beanFactory.getBean(clz);
return result;
}
/**
* 如果BeanFactory包含一个与所给名称匹配的bean定义,则返回true
*
* @param name
* @return boolean
*/
public static boolean containsBean(String name) {
return beanFactory.containsBean(name);
}
/**
* 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 如果与给定名字相应的bean定义没有被找到,将会抛出一个异常(NoSuchBeanDefinitionException)
*
* @param name
* @return boolean
* @throws NoSuchBeanDefinitionException
*/
public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
return beanFactory.isSingleton(name);
}
/**
* @param name
* @return Class 注册对象的类型
* @throws NoSuchBeanDefinitionException
*/
public static Class<?> getType(String name) throws NoSuchBeanDefinitionException {
return beanFactory.getType(name);
}
/**
* 如果给定的bean名字在bean定义中有别名,则返回这些别名
*
* @param name
* @return
* @throws NoSuchBeanDefinitionException
*/
public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
return beanFactory.getAliases(name);
}
/**
* 获取aop代理对象
*
* @param invoker
* @return
*/
@SuppressWarnings("unchecked")
public static <T> T getAopProxy(T invoker) {
return (T) AopContext.currentProxy();
}
/**
* 获取当前的环境配置,无配置返回null
*
* @return 当前的环境配置
*/
public static String[] getActiveProfiles() {
return applicationContext.getEnvironment().getActiveProfiles();
}
/**
* 获取当前的环境配置,当有多个环境配置时,只获取第一个
*
* @return 当前的环境配置
*/
public static String getActiveProfile() {
final String[] activeProfiles = getActiveProfiles();
return ArrayUtil.isNotEmpty(activeProfiles) ? activeProfiles[0] : null;
}
}
执行类
package com.vipsoft.web.task;
import cn.hutool.core.date.DateUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
@Component("scheduletask")
public class ScheduleTask {
protected final Logger logger = LoggerFactory.getLogger(this.getClass());
public void execute(String param) {
logger.info("执行 Schedule Task,当前时间:{},任务参数:{}", DateUtil.now(), param);
}
}
测试类
package com.vipsoft.web;
import cn.hutool.core.util.StrUtil;
import com.vipsoft.web.utils.SpringUtils;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import java.lang.reflect.Method;
@SpringBootTest
public class SpringUtilTest {
@Test
void invokeTest() throws Exception {
//点前面的做为 bean 名称,后面是方法名,(中是参数==参数可以放JSON)
String invokeTarget = "scheduletask.execute('VipSoft Quartz')";
invokeMethod(invokeTarget);
}
void invokeMethod(String invokeTarget) throws Exception {
String beanName = StrUtil.subBefore(invokeTarget, ".", true);
String methodName = StrUtil.subBetween(invokeTarget, ".", "(");
String param = StrUtil.subBetween(invokeTarget, "(", ")");
Object bean;
if (StrUtil.count(beanName, ".") == 0) {
bean = SpringUtils.getBean(beanName);
} else {
//Package 的形式得到 Bean,如: beanName="com.vipsoft.web.task.ScheduleTask"
bean = Class.forName(beanName).newInstance();
}
if (bean != null) {
if (StrUtil.isNotEmpty(param)) {
Method method = bean.getClass().getDeclaredMethod(methodName, String.class);
method.invoke(bean, param);
} else {
Method method = bean.getClass().getDeclaredMethod(methodName);
method.invoke(bean);
}
}
}
}
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