Question

我一直在研究websockets，并在github上找到了一个信息丰富的例子，我已经开始在我自己的项目中实现了。链接： https://github.com/netgloo/spring-boot-samples/tree/master/spring-boot-web-socket-user-notifications

我想我对此有很多疑问，但我会尽量不让你们超负荷。

我打算在用户之间使用websockets进行好友请求通知（接受/拒绝），但目前传递消息的时间很长。您是否会推荐使用带弹簧的websocket方法，或者在实施通知时是否有更简单/更实用的技术？
目前我的“通知”实体与教程完全相同，将“通知”作为bean并将这些消息保存在我正在使用的数据库中是不错的做法，或者这不适用什么时候使用websockets？
在控制器类中，正在创建一个新的“通知”对象，传递参数“hello”和“UserA”，我如何将数据库中的硬编码用户名传递给此方法，以便通知将是发送到“g@gmail.com”而不是UserA，因为对我来说显而易见的方式没有造成任何错误，但几乎没有做任何事情（所以看起来如此）并且没有消息传递。

问题1和2是建议，问题3是与代码相关的问题

这是我的控制器代码（相关部分）：

//websocket

  @Autowired
  private NotificationService notificationService;

  /**
   * GET  /  -> show the index page.
   */
  @RequestMapping("/index2")
  public String index2() {
    return "index2";
  }

  /**
   * GET  /notifications  -> show the notifications page.
   */
  @RequestMapping("/notifications")
  public String notifications() {
    return "notifications";
  }

  /**
   * POST  /some-action  -> do an action.
   * 
   * After the action is performed will be notified UserA.
   */
  @RequestMapping(value = "/some-action", method = RequestMethod.POST)
  @ResponseBody
  public ResponseEntity<?> someAction() {

    // Do an action here
    // ...

   //me messing about to try and map the correct user (ignore)
    UserLogin testuser = userRepository.findByUserName("g@gmail.com");
    String name = testuser.getUserName();


    // Send the notification to "UserA" (by username)
    notificationService.notify(
      new Notification("hello"), // notification object
      "g@gmail.com"                   // username
    );

    // Return an http 200 status code
    return new ResponseEntity<>(HttpStatus.OK);
  }
  /////////////////////////////

通知服务（请注意，我在绝望的测试尝试中将变量String username更改为String userName）：

@Service
public class NotificationService {

  // The SimpMessagingTemplate is used to send Stomp over WebSocket messages.
  @Autowired
  private SimpMessagingTemplate messagingTemplate;

  /**
   * Send notification to users subscribed on channel "/user/queue/notify".
   *
   * The message will be sent only to the user with the given username.
   * 
   * @param notification The notification message.
   * @param username The username for the user to send notification.
   */
  public void notify(Notification notification, String userName) {
    messagingTemplate.convertAndSendToUser(
      userName, 
      "/queue/notify", 
      notification
    );
    return;
  }

}

我没有将教程中的WebSecurityConfig.java类包含到我的项目中，因为我已经存在了一个。（这可能是问题所在）这是我的websecurityconfig文件：

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
       UserLoginRepository userLoginRepository;


    //http.authorizeRequests().antMatchers("/", "/home", "/registeruser").permitAll().antMatchers("/admin").hasRole("ADMIN")

     @Autowired
     DataSource dataSource;

        @Override
        protected void configure(HttpSecurity http) throws Exception {
            http.authorizeRequests().antMatchers("/", "/home", "/registeruser").permitAll().antMatchers("/admin").hasRole("ADMIN")
                    .anyRequest().authenticated().and().formLogin().loginPage("/login").permitAll().and().logout()
                    .permitAll();
            http.exceptionHandling().accessDeniedPage("/403");
        }



    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {

        //authorities at the moment is the manager i.e. 'Manager' from user_login

           auth.jdbcAuthentication().dataSource(dataSource)
          .usersByUsernameQuery("select user_name,password,user_status from user_login where user_name=?")
          .authoritiesByUsernameQuery("select user_name,password, 'Manager'  from user_login where user_name=?");          

}

    }

这是我的userlogin模型，这是我想要接收消息而不是“UserA”的对象。

@Entity
public class UserLogin {


    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;
    private String firstName;
    private String lastName;
    private Long phone;
    private String userName;
    private String address;
    private String password;
    private boolean userStatus;
    private String userType;
    private String position;



    @OneToMany(fetch=FetchType.LAZY, cascade=CascadeType.ALL)
     public Set<PlayerSeasonStat> playerStats;

    public UserLogin()
    {

    }


    public UserLogin(Long id, String firstName, String lastName, Long phone,
            String userName, String address, String password,
            boolean userStatus, String userType, String position,
            Set<PlayerSeasonStat> playerStats) {
        super();
        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
        this.phone = phone;
        this.userName = userName;
        this.address = address;
        this.password = password;
        this.userStatus = userStatus;
        this.userType = userType;
        this.position = position;
        this.playerStats = playerStats;
    }

////getters and setters

我也在控制台上获得一些信息，说sockJsScheduler中有一个活动线程：

2018-02-07 12:54:14.526  INFO 11776 --- [MessageBroker-1] o.s.w.s.c.WebSocketMessageBrokerStats    : WebSocketSession[0 current WS(0)-HttpStream(0)-HttpPoll(0), 0 total, 0 closed abnormally (0 connect failure, 0 send limit, 0 transport error)], stompSubProtocol[processed CONNECT(0)-CONNECTED(0)-DISCONNECT(0)], stompBrokerRelay[null], inboundChannel[pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0], outboundChannelpool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0], sockJsScheduler[pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 0]

请注意，我的项目中所有其他java / jsp / html页面与教程中的相同（除了index.html页面，我已将其重命名为index2.html并在整个项目中对其进行了修改，显然我已在上面提到过。

如果您需要更多代码，请告诉我，因为我不希望这看起来像一篇文章！

Answer 1

更新：所以我搞乱了我的项目，并发现websocket技术无法通信的原因是因为在我的项目中WebSecurityConfig.java类（与教程WebSecurityConfig.java类完全不同）我没有禁用csrf，这显然允许websockets在禁用后进行通信！

所以我补充道：

http.csrf().disable();

进入此方法（在WebSecurityConfig中）：

@Override
        protected void configure(HttpSecurity http) throws Exception {
            http.authorizeRequests().antMatchers("/", "/home", "/registeruser").permitAll().antMatchers("/admin").hasRole("ADMIN")
                    .anyRequest().authenticated().and().formLogin().loginPage("/login").permitAll().and().logout()
                    .permitAll();
            http.exceptionHandling().accessDeniedPage("/403");
            http.csrf().disable();
        }

它有效！

如何在spring mvc中使用websockets在实体之间进行通信

1 个答案: