前言

???????最近，说有可能要上只允许一个地方登录，还要配合信息推送，今天有空，就起个头，把登录超时、登录踢人下线一起做了。信息推送的，后面再说，留好口子就行。

一、背景

这里是spring security，其实这块已经很成熟了，加几个配置就行。

二、使用步骤

1.security配置增加


/**
 * 安全认证配置
 *
 * @author zhengwen
 */
@Configuration
@EnableWebSecurity
@Order(1)
public class LinkappSecurityConfiguration extends WebSecurityConfigurerAdapter {

  @Resource
  private SessionInformationExpiredStrategy sessionInformationExpiredStrategy;

  @Resource
  private InvalidSessionStrategy invalidSessionStrategy;
 

  @Override
  protected void configure(HttpSecurity http) throws Exception {

//		解决 spring security 对于开放接口返回乱码的解决
    CharacterEncodingFilter filter = new CharacterEncodingFilter();
    filter.setEncoding("UTF-8");
    filter.setForceEncoding(true);
    http.addFilterBefore(filter, CsrfFilter.class);
    http.addFilterBefore(authenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);
    http
        // 禁止匿名用户
        // .anonymous().disable()
        // 禁止csrfz

        .csrf().disable()
        // 认证失败处理
        .exceptionHandling()
        .authenticationEntryPoint(new HttpStatusEntryPoint(HttpStatus.UNAUTHORIZED))
        .and()
        // 白名单
        .authorizeRequests()
        .antMatchers("/swagger-ui.html", "/webjars/**", "/swagger-resources/**", "/v2/api-docs/**",           "/enterpriseEditionBi/**","/oss/download/**","/download/**","/config/getEduUrl")
        .permitAll()
        // 接口调试阶段 目前不校验接口 modify by tongjie
        .anyRequest().authenticated().and()
        // 表单登录配置
        .formLogin()
        // 登录成功处理
        .successHandler(linkappRestAuthenticationSuccessHandler)
        // 登录失败处理
        .failureHandler(linkappRestAuthenticationFailureHandler).and()
        // 登出成功处理
        .logout().logoutSuccessHandler(linkappRestLogoutSuccessHandler);
      //一个账号只允许一个地方登录,
      http.sessionManagement()
              //session失效，调用此方法
              .invalidSessionStrategy(invalidSessionStrategy).maximumSessions(1)
              // 当用户达到最大session数后，则调用此处的实现
              .expiredSessionStrategy(sessionInformationExpiredStrategy);
  }

    @Bean
    @ConditionalOnMissingBean(InvalidSessionStrategy.class)
    public InvalidSessionStrategy invalidSessionStrategy() {
        return new MyInvalidSessionStrategy();
    }
    @Bean
    @ConditionalOnMissingBean(SessionInformationExpiredStrategy.class)
    public SessionInformationExpiredStrategy informationExpiredStrategy() {
        return new MySessionInformationExpiredStrategy();
    }
}

http.sessionManagement()开始就是本次分享内容。注意下面的2个bean，@Bean注解的。

2.MyInvalidSessionStrategy


/**
 * @author zhengwen
 */
public class MyInvalidSessionStrategy implements InvalidSessionStrategy {
    @Override
    public void onInvalidSessionDetected(HttpServletRequest httpServletRequest, HttpServletResponse response) throws IOException {
        /* 接口请求没有页面，给统一的友好提示，可以直接利用封装的的业务异常
        response.setStatus(HttpStatus.HTTP_UNAUTHORIZED);
        response.setContentType("application/json;charset=utf-8");
        response.getWriter().write("当前登录已失效！请重新登录");
        */
        throw new BusinessException("当前登录已失效！请重新登录");
    }
}

BusinessException是封装的业务异常类。

3.MySessionInformationExpiredStrategy


/**
 * @author zhengwen
 */
@Slf4j
@Component
public class MySessionInformationExpiredStrategy implements SessionInformationExpiredStrategy {

    @Autowired
    private LinkappRestAuthenticationFailureHandler myAuthenticationFailureHandler;

    @Override
    public void onExpiredSessionDetected(SessionInformationExpiredEvent event) {
        // 1. 获取用户名
        UserDetails userDetails =
                (UserDetails) event.getSessionInformation().getPrincipal();

        AuthenticationException exception =
                new AuthenticationServiceException(
                        String.format("[%s]用户在其他地方登录,您已被下线", userDetails.getUsername()));
        //TODO 这里可以增加根据用户名找到手机号信息，进行推送信息，或者在myAuthenticationFailureHandler里去处理
        try {
            // 当用户在另外终端登录后,交给失败处理器回到认证页面
            event.getRequest().setAttribute("toAuthentication", true);
            myAuthenticationFailureHandler
                    .onAuthenticationFailure(event.getRequest(), event.getResponse(), exception);
        } catch (Exception e) {
            log.error("--登录失效session清除异常，原因：{}", e.getMessage());
            throw new BusinessException("超时登录session清除异常");
        }
    }
}

4.MyAuthenticationFailureHandler



/**
 * 认证失败处理者
 *
 * @author zhengwen
 */
@Component
public class MyAuthenticationFailureHandler implements AuthenticationFailureHandler {
 

    @Override
    public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response,
        AuthenticationException exception) {

        //TODO 自己的异常处理逻辑

        RestMessage message = RestBuilders.failureBuilder().code("login.failure")
            .message(exception.getMessage()).build();

        Responses.standard(response).respond(message);

    }
    
}