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);
            }
        }
    }

}

热门相关:帝少的专属:小甜心,太缠人   刺客之王   霸皇纪   豪门闪婚:帝少的神秘冷妻   霸皇纪