我正在尝试eclipse.paho在我的项目中实现连接Mqtt Broker(订阅和发布目的).问题是,当我使用订阅功能(实现MqttCallback界面)时,我无法想象如果连接丢失,我该如何重新连接.MqttCallback接口有一个connectionLost方法,但它对于导致连接丢失的调试很有用.我搜索但找不到建立自动重新连接的方法.你能建议一个关于这个问题的方法或文件吗?
我有一个 Spring Boot 项目(2.0.0.RELEASE)。我使用基于 JWT 令牌的身份验证和授权来保护 REST。我还想将 Websocket 与 SockJS 结合使用,并使用 Token 进行套接字身份验证。我尝试实施关于这篇文章的内容,但是我无法成功。
\n\n首先,我的安全配置如下;
\n\n@Configuration\n@EnableWebSecurity\n@EnableGlobalMethodSecurity(prePostEnabled = true)\npublic class SecurityConfig extends WebSecurityConfigurerAdapter {\n\n private final TokenAuthenticationService tokenAuthenticationService;\n private final ObjectMapper mapper;\n\n @Autowired\n protected SecurityConfig(final TokenAuthenticationService tokenAuthenticationService, ObjectMapper mapper) {\n super();\n this.tokenAuthenticationService = tokenAuthenticationService;\n this.mapper = mapper;\n }\n\n @Override\n protected void configure(HttpSecurity http) throws Exception {\n http.headers()\n .frameOptions().disable()\n .and()\n .authorizeRequests()\n .antMatchers("/api/v3/auth").permitAll()\n .antMatchers("/api/v3/signup").permitAll()\n .antMatchers("/api/v3/websocket/**").permitAll()\n .anyRequest().authenticated()\n .and()\n .exceptionHandling().authenticationEntryPoint(new RestAuthenticationEntryPoint(mapper))\n .and()\n .addFilterBefore(new AuthenticationTokenFilter(tokenAuthenticationService), UsernamePasswordAuthenticationFilter.class)\n .cors()\n .and()\n .csrf().disable();\n }\n\n @Bean\n public CorsFilter …Run Code Online (Sandbox Code Playgroud) spring spring-security websocket spring-boot spring-websocket
我正在尝试将这个结构化的json字符串解析为Java Object但是我每次尝试都失败了.
{
"message": "Test Message",
"status": true,
"users": {
"user_xy": [
{
"time": "2016-08-25 19:01:20.944614158 +0300 EEST",
"age": 24,
"props": {
"pr1": 197,
"pr2": 0.75,
"pr3": 0.14,
"pr4": -0.97
}
}
],
"user_zt": [
{
"time": "2016-08-25 17:08:36.920891187 +0300 EEST",
"age": 29,
"props": {
"pr1": 1.2332131860505051,
"pr2": -0.6628148829634317,
"pr3": -0.11622442112006928
}
}
]
}
}
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props字段可以包含1个属性或6个属性,它取决于db记录.用户名部分也会动态变化.
我可以用Jackson Lib成功解析这个结构化字符串吗?