Spring应用内部获取ApplicationContext的两种方法

方法1：
继承ApplicationObjectSupport类，然后调用继承的方法手动获取：

ConfigurableApplicationContext context = (ConfigurableApplicationContext) getApplicationContext();
//动态添加新的bean

接下来就可以做想做的事了

方法2：
实现ApplicationContextAware接口，重写setApplicationContext方法，Spring会创建bean时自动注入
完整案例

@Controller
@RequestMapping("/test")
public class SessionTestController implements ApplicationContextAware {
    private ExcelCache prevCache;
    private ApplicationContext applicationContext;

    @RequestMapping("/testsessionscope")
    public @ResponseBody
    JSONObject testSessionScope(){
        JSONObject res = new JSONObject();
        ExcelCache excelCache = getExcelCache();
//do something
        return res;
    }


    private ExcelCache getExcelCache() {
        return (ExcelCache) applicationContext.getBean("excelCache");
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }
}