spring 4 + sockjs (websocket) with tomcat7+ jdk 1.7+

+메이븐 설정

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-websocket</artifactId>
    <version>${org.springframework-version}</version>
</dependency>
        
<dependency> 
    <groupId>org.springframework</groupId>
    <artifactId>spring-messaging</artifactId> 
    <version>${org.springframework-version}</version> 
</dependency>
                
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.2.3</version>
</dependency>

+웹소켓 요청에 대한 핸들러 작성

@Component
public class ContentHandler extends TextWebSocketHandler {
    
    List<WebSocketSession> userList;
    
    public ContentHandler(){
        this.userList = new LinkedList<WebSocketSession>();
    }
 
    
    @Override
    public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception {
 
        String payloadMessage = (String) message.getPayload();
        try {
            
            ResultContent rc = new ResultContent();
            
            for(WebSocketSession socketSession : userList){
                socketSession.sendMessage(new TextMessage(payloadMessage));
            }
            
        } catch (JsonParseException jpe) {
            jpe.printStackTrace();
        } catch (JsonMappingException jme) {
            jme.printStackTrace();
        }
    }
    
    
    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        session.getRemoteAddress().getHostName();
        userList.add(session); //접속 클라이언트의 세션 저장
    }
    
    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
        userList.remove(session); //접속 클라이언트의 세션 삭제
    }
    
    
}

+웹소켓 설정으로 작성한 핸들러 등록

@Configuration
@EnableWebMvc
@EnableWebSocket
public class WebsocketConfig implements WebSocketConfigurer {
 
    @Resource(name="contentHandler")
    ContentHandler handler;
    
    
    
    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        registry.addHandler(handler, "/contentPush").withSockJS();
    }   
    
    public void configureDefaultServletHandling(
    DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }
 
}

+ 자바스크립트 소켓 객체 생성

 if ("WebSocket" in window)
      {
        var ws = new SockJS("http://${urlInfo}/contentPush");
         
         
         ws.onopen = function()
         {
             //웹 소켓이 연결되었을 때
            ws.send('안녕하세요.');
         };
            
         
          ws.onmessage = function (evt) 
         { 
            //웹 소켓 메세지를 보냈을 때 
            var received_msg = evt.data;
            
            alert(received_msg);
            
            
         };
            
         ws.onclose = function()
         { 
             //웹 소켓이 닫힐 때
         //   alert("Connection is closed..."); 
         }; 
      }
      
      else
      {
         // 여기는 웹소켓이 지원되지 않는 브라우저일 때
      }