[Java知识库]SpringBoot问题集锦（添加中）

Bean类无法扫描到或者指定注解的类无法启动后扫描到

响应注解所在的类或者相应的Bean没有在启动Application所在的相同包目录下

properties 文件读取中文乱码问题

 val props = Properties()
 var inputStream: InputStream? = null
 try {
     inputStream = this::class.java.classLoader.getResourceAsStream(propertiesName)
     if (inputStream != null) {
         val isr = InputStreamReader(inputStream, "UTF-8")
         val br = BufferedReader(isr)
         props.load(br)
         props.load(isr)
     } else {
         getLogUtil().logE(this::class.java, "${propertiesName}配置文件加载异常")
    }
 } catch (e: Exception) {
    getLogUtil().logE(this::class.java, "${propertiesName}配置文件加载异常")
 } finally {
     try {
         inputStream?.close()
     } catch (e: IOException) {
         getLogUtil().logE(this::class.java, "${propertiesName}文件流关闭出现异常")
     }
 }

Controller返回字符串中文乱码问题

@Configuration
class MyConfiguration : WebMvcConfigurationSupport() {
    override fun extendMessageConverters(converters: List<HttpMessageConverter<*>?>) {
        // 解决controller返回字符串中文乱码问题
        for (converter in converters) {
            if (converter is StringHttpMessageConverter) {
                converter.defaultCharset = StandardCharsets.UTF_8
            }
        }
    }
}

继承了WebMvcConfigurationSupport，则在yml中配置的相关内容会失效，或者静态接口无法访问失效

@Configuration
class MyConfiguration : WebMvcConfigurationSupport() {
    /**
     * 发现如果继承了WebMvcConfigurationSupport，则在yml中配置的相关内容会失效。 需要重新指定静态资源
     *
     * @param registry
     */
    override fun addResourceHandlers(registry: ResourceHandlerRegistry) {
        registry.addResourceHandler("/**").addResourceLocations("classpath:/static/")
        registry.addResourceHandler("swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/")
        registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/")
        super.addResourceHandlers(registry)
    }

    /**
     * 配置servlet处理
     */
    override fun configureDefaultServletHandling(configurer: DefaultServletHandlerConfigurer) {
        configurer.enable()
    }
}

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