Question

在此类中@Autowired是可行的

 $( function() {
    $('tr').click( function() {
    $(this).toggleClass("green-cell");
    if ($(this).hasClass("green-cell")) {
      count += 1;
    } else {
      count -= 1;
    }
    button.innerHTML =   count;
    } );
    } );

在此类中，@ Autowired不起作用

@Configuration
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {

    @Autowired
    private UserDAO userDAO; // is NOT null

    @Autowired
    private IArticleService articleService; // is NOT null

    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        registry.addHandler(new SocketTextHandler(), "/user").addInterceptors(new HttpHandshakeInterceptor());
    }
}

也许这就像频道的wss一样？

Answer 1

您的HttpHandshakeInterceptor实例不受Spring的管理（即您正在使用new创建实例）。

您在这里有两个选择：

1。使HttpHandshakeInterceptor接受类型为UserDAO和IArticleService的参数

public class HttpHandshakeInterceptor implements HandshakeInterceptor {

      private IArticleService articleService;

      private UserDAO userDAO;

      public HttpHandshakeInterceptor(UserDAO userDAO, IArticleService articleService){
          this.userDAO = userDAO;
          this.articleService = articleService;
      }

    public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception ex) {

    }

将@Component放在HttpHandshakeInterceptor上

@Component
public class HttpHandshakeInterceptor implements HandshakeInterceptor {

    @Autowired
    private IArticleService articleService; // is null

    @Autowired
    private UserDAO userDAO; // is null

    public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception ex) {

    }
}

并在配置中使用@Autowired：

@Configuration
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {

    @Autowired
    private UserDAO userDAO;

    @Autowired
    private IArticleService articleService;

    @Autowired
    private HttpHandshakeInterceptor interceptor;

    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        registry.addHandler(new SocketTextHandler(), "/user").addInterceptors(interceptor);
    }
}

您还可以在@Component个文件之一中使用@Bean定义的@Configuration注释来实现您的目标。

此外，您也可以沿@Configurable的路线行驶，但是据我所知，此时您似乎不需要它。

springboot websocket不起作用@Autowired

1 个答案: