Flowable 監聽器獲取不到 Bean 問題

問題描述

在監聽器中，不管是 @Autowired 還是 @Resource 註解都無法獲取到服務

方法一

@PostConstruct 獲取 Bean

/**
 * 會籤監聽器
 * @author: linjinp
 * @create: 2019-11-18 11:43
 **/
@Component
public class MyListener implements ExecutionListener {

    // 頁面配置參數注入
    private FixedValue num;

    @Autowired
    private RuntimeService runtimeService;

    private static MyListener myListener;

    // 解決監聽器中 Bean 獲取不到問題
    @PostConstruct
    public void init() {
        myListener = this;
        myListener.runtimeService = this.runtimeService;
    }

    @Override
    public void notify(DelegateExecution delegateExecution) {
        // 調用 runtimeService 示例
        ProcessInstance processInstance = myListener.runtimeService.createProcessInstanceQuery().processInstanceId(delegateExecution.getProcessInstanceId()).singleResult();
        System.out.println(processInstance.getProcessDefinitionId());

        // 獲取頁面配置參數的值
        System.out.println(num.getExpressionText());

        // 校驗 okNum 是否已經存在
        if (!delegateExecution.hasVariable("okNum")) {
            delegateExecution.setVariable("okNum", 0);
        }
        // 已審覈次數，審覈一次 +1
        int okNum = (int) delegateExecution.getVariable("okNum") + 1;
        delegateExecution.setVariable("okNum", okNum);
    }
}

方法二

流程引擎服務通過 Context.getProcessEngineConfiguration() 獲取

import org.flowable.engine.impl.context.Context;

RuntimeService runtimeService = Context.getProcessEngineConfiguration().getRuntimeService();

自己的接口獲取

工具類

/**
 * 獲取 Bean
 * @author: linjinp
 * @create: 2019-12-17 13:12
 **/
@Component
public class SpringUtilConfig implements ApplicationContextAware {

    /**
     * 當前IOC
     *
     */
    private static ApplicationContext applicationContext;

    /**
     * * 設置當前上下文環境，此方法由spring自動裝配
     *
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    /**
     * 從當前IOC獲取bean
     *
     * @return
     *
     */
    public static <T> T getBean(Class<T> c) {
        return applicationContext.getBean(c);
    }
}

調用

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