Flowable 监听器获取不到 Bean 问题

谁借莪１个温暖的怀抱￠ 2023-06-15 11:24 4阅读 0赞

### Flowable 监听器获取不到 Bean 问题 ###

*  问题描述
 *  方法一
 *  方法二

# 问题描述 #

在监听器中，不管是 `@Autowired` 还是 `@Resource` 注解都无法获取到服务  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3MTQzNjcz_size_16_color_FFFFFF_t_70]

# 方法一 #

`@PostConstruct` 获取 `Bean`

/** * 会签监听器 * @author: linjinp * @create: 2019-11-18 11:43 **/
    @Component
    public class MyListener implements ExecutionListener { 
    
        // 页面配置参数注入
        private FixedValue num;
    
        @Autowired
        private RuntimeService runtimeService;
    
        private static MyListener myListener;
    
        // 解决监听器中 Bean 获取不到问题
        @PostConstruct
        public void init() { 
            myListener = this;
            myListener.runtimeService = this.runtimeService;
        }
    
        @Override
        public void notify(DelegateExecution delegateExecution) { 
            // 调用 runtimeService 示例
            ProcessInstance processInstance = myListener.runtimeService.createProcessInstanceQuery().processInstanceId(delegateExecution.getProcessInstanceId()).singleResult();
            System.out.println(processInstance.getProcessDefinitionId());
    
            // 获取页面配置参数的值
            System.out.println(num.getExpressionText());
    
            // 校验 okNum 是否已经存在
            if (!delegateExecution.hasVariable("okNum")) { 
                delegateExecution.setVariable("okNum", 0);
            }
            // 已审核次数，审核一次 +1
            int okNum = (int) delegateExecution.getVariable("okNum") + 1;
            delegateExecution.setVariable("okNum", okNum);
        }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3MTQzNjcz_size_16_color_FFFFFF_t_70 1]

# 方法二 #

流程引擎服务通过 `Context.getProcessEngineConfiguration()` 获取

import org.flowable.engine.impl.context.Context;
    
    RuntimeService runtimeService = Context.getProcessEngineConfiguration().getRuntimeService();

自己的接口获取

工具类

/** * 获取 Bean * @author: linjinp * @create: 2019-12-17 13:12 **/
    @Component
    public class SpringUtilConfig implements ApplicationContextAware { 
    
        /** * 当前IOC * */
        private static ApplicationContext applicationContext;
    
        /** * * 设置当前上下文环境，此方法由spring自动装配 * */
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { 
            this.applicationContext = applicationContext;
        }
    
        /** * 从当前IOC获取bean * * @return * */
        public static <T> T getBean(Class<T> c) { 
            return applicationContext.getBean(c);
        }
    }

调用

RequsetFunctionService requsetFunctionService = SpringUtilConfig.getBean(RequsetFunctionService.class);

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