websocket不能注入,@Autowired为空
在调用websocket发送消息时候,发现通过@Autowired无法注入WebSocketProcess,网上搜寻了下答案,大致原因为spring管理的都是单例(singleton),和 websocket (多对象)相冲突。因为websocket是多实例单线程的,而websocket中的对象在@Autowried时,只有整个项目启动时会注入,而之后新的websocket实例都不会再次注入,故websocket上@Autowried的bean是会为null的
解决方法有两个, 第一:将要注入的 service/Bean 改成 static,就不会为null了。(我没有成功)
这里使用静态,让 service 属于类 private static WebSocketProcess webSocketProcess; @Autowired public void setWebSocketProcess(WebSocketProcess webSocketProcess) { CReceiveMsgThread.webSocketProcess = webSocketProcess; }
第二:通过SpringContextUtil工具类获取上下文的WebSocketProcess对象,这样就不必再注入WebSocketProcess
SpringContextUtil代码:
@Component public class SpringContextUtil implements ApplicationContextAware { /** * 上下文对象实例 */ private static ApplicationContext applicationContext; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { this.applicationContext = applicationContext; } /** * 获取applicationContext * * @return */ public static ApplicationContext getApplicationContext() { return applicationContext; } /** * 获取HttpServletRequest */ public static HttpServletRequest getHttpServletRequest() { return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest(); } public static String getDomain(){ HttpServletRequest request = getHttpServletRequest(); StringBuffer url = request.getRequestURL(); return url.delete(url.length() - request.getRequestURI().length(), url.length()).toString(); } public static String getOrigin(){ HttpServletRequest request = getHttpServletRequest(); return request.getHeader("Origin"); } /** * 通过name获取 Bean. * * @param name * @return */ public static Object getBean(String name) { return getApplicationContext().getBean(name); } /** * 通过class获取Bean. * * @param clazz * @param <T> * @return */ public static <T> T getBean(Class<T> clazz) { return getApplicationContext().getBean(clazz); } /** * 通过name,以及Clazz返回指定的Bean * * @param name * @param clazz * @param <T> * @return */ public static <T> T getBean(String name, Class<T> clazz) { return getApplicationContext().getBean(name, clazz); } }