Spring 获取 Context

一、Spring中获取ApplicationContext

1. Spring范围内

在Spring范围内，可使用@Autowired直接注入

@Autowired
ApplicationContext applicationContext;

2.Spring范围外

2.1 ApplicationContextAware

@Component
public class ApplicationContextHolder  implements ApplicationContextAware {

	private  static ApplicationContext applicationContext;
	
	@Override
	public void setApplicationContext(ApplicationContext context)  {
		ApplicationContextHolder.applicationContext = context;
	}

	public static ApplicationContext getApplicationContext(){
		return applicationContext;
	}
}

2.2 通过Request获取

/** web.xml中 DispatcherServlet 的 servlet-name  **/
private static final String SPRING_MVC_SERVLET_NAME = "appServlet";  

/**  org.springframework.web.servlet.FrameworkServlet.CONTEXT.appServlet  **/
private static final String APPLICATION_CONTEXT_KEY = FrameworkServlet.SERVLET_CONTEXT_PREFIX +SPRING_MVC_SERVLET_NAME;


ApplicationContext applicationContext = (ApplicationContext) httpServletRequest.getSession().getServletContext().getAttribute(APPLICATION_CONTEXT_KEY);

2.3 RequestContextUtils

ApplicationContext applicationContext = (ApplicationContext) RequestContextUtils.findWebApplicationContext(httpServletRequest);

2.4 ContextLoader

ApplicationContext applicationContext = (ApplicationContext) ContextLoader.getCurrentWebApplicationContext();

二、Spring 中获取Request/Response

1.RequestContextHolder

HttpServletRequest httpServletRequest = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();

		HttpServletResponse httpServletResponse = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getResponse();