如何在静态上下文中正确利用依赖注入

Question

虽然我的应用程序是一个web应用程序，但它并不使用Spring的web控制器。只是休息(运动衫)和插座。只有大约一半的应用程序使用依赖注入。我的应用程序是在我的main()中初始化的。

ServletRegistration jerseyServletRegistration = ctx.addServlet("JerseyServlet", new SpringServlet());
jerseyServletRegistration.setInitParameter("com.sun.jersey.config.property.packages", "com.production.resource");
jerseyServletRegistration.setInitParameter("com.sun.jersey.spi.container.ContainerResponseFilters", "com.production.resource.ResponseCorsFilter");
jerseyServletRegistration.setInitParameter("com.sun.jersey.api.json.POJOMappingFeature", Boolean.TRUE.toString());
jerseyServletRegistration.setInitParameter("com.sun.jersey.config.feature.DisableWADL", Boolean.TRUE.toString());
jerseyServletRegistration.setInitParameter("org.codehaus.jackson.map.DeserializationConfig.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY", Boolean.TRUE.toString());
jerseyServletRegistration.setLoadOnStartup(1);

jerseyServletRegistration.addMapping("/api/*");

//add atmosphere support
ServletRegistration socketRegistration = ctx.addServlet("AtmosphereServlet", new SocketInitializer());
socketRegistration.setLoadOnStartup(1);
//socketRegistration.addMapping("/socket/*");

//deploy
logger.info("Deploying server...");
ctx.deploy(server);

server.start();

//start the production process
Production.init();

System.in.read();
server.stop();

在Production类中，我通过ApplicationContextProvider加载服务。是否有更好的方法可以通过依赖注入加载所有资源？

public static void init() {
    //add hook to trigger Production Shutdown sequence
    Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
        public void run() {
            Production.shutdown();
        }
    }));

    logger.info("Initializing production workflows...");
    productionService = (ProductionService) ApplicationContextProvider.getApplicationContext().getBean("productionService");

    //load active workflows into memory
    WorkflowService workflowService = (WorkflowService) ApplicationContextProvider.getApplicationContext().getBean("workflowService");
    for (WorkflowEntity workflowEntity : workflowService.findActive()) {
        logger.info("      - "+workflowEntity.getName()+"");
        workflowList.add(Workflow.factory(workflowEntity));
    }

    bootup();

    logger.info("Production initialized");
}

Answer 1

我认为没有办法做到这一点，因为静态的背景。

如果可以以非静态的方式使用init()方法，那么可以使用SpringBeanAutowiringSupport助手类：

@Autowired
private ProductionService productionService;

// ... another dependencies

public void init() throws ServletException {
    SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);
    // use autowired services
}

还有一个选项:您可以使用SpringBeanAutowiringSupport作为Production类的基类。在这种情况下，您不需要手动调用SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);。只需添加依赖项并运行即可。