## 跨域支持 import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.cors.CorsConfiguration; import org.springframework.web.cors.UrlBasedCorsConfigurationSource; import org.springframework.web.filter.CorsFilter; @Configuration public class CorsConfig { /** * 跨域支持 * * @return */ @Bean public CorsFilter corsFilter() { final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(); final CorsConfiguration config = new CorsConfiguration(); config.setAllowCredentials(true); // 允許cookies跨域 config.addAllowedOrigin("*");// #允許向該服務器提交請求的URI，*表示全部允許 config.addAllowedHeader("*");// #允許訪問的頭資訊,*表示全部 config.setMaxAge(18000L);// 預檢請求的快取時間（秒），即在這個時間段里，對于相同的跨域請求不會再預檢了 config.addAllowedMethod("*");// 允許提交請求的方法，*表示全部允許 source.registerCorsConfiguration("/**", config); return new CorsFilter(source); } } ## RestTemplate高并發下例外與配置 import org.apache.http.client.HttpClient; import org.apache.http.impl.client.HttpClientBuilder; import org.apache.http.impl.client.HttpClients; import org.apache.http.impl.conn.PoolingHttpClientConnectionManager; import org.springframework.cloud.client.loadbalancer.LoadBalanced; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.http.client.HttpComponentsClientHttpRequestFactory; import org.springframework.web.client.DefaultResponseErrorHandler; import org.springframework.web.client.RestTemplate; /** * * RestTemplate高并發下例外與配置說明 * 1、java.util.ConcurrentModificationException * 2、java.net.SocketTimeoutException Connection timed out */ @Configuration public class RestTemplateConfig { @Bean @LoadBalanced public RestTemplate restTemplate() { // 長連接 PoolingHttpClientConnectionManager pollingConnectionManager = new PoolingHttpClientConnectionManager(); // 總連接數 pollingConnectionManager.setMaxTotal(1000); // 同路由的并發數 pollingConnectionManager.setDefaultMaxPerRoute(1000); HttpClientBuilder httpClientBuilder = HttpClients.custom(); httpClientBuilder.setConnectionManager(pollingConnectionManager); // 重試次數，默認是3次，沒有開啟 // httpClientBuilder.setRetryHandler(new DefaultHttpRequestRetryHandler(3, true)); HttpClient httpClient = httpClientBuilder.build(); HttpComponentsClientHttpRequestFactory clientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory( httpClient); // 連接超時 ms clientHttpRequestFactory.setConnectTimeout(12000); // 資料讀取超時時間，即SocketTimeout ms clientHttpRequestFactory.setReadTimeout(12000); // 連接不夠用的等待時間，不宜過長，必須設定，比如連接不夠用時，時間過長將是災難性的 clientHttpRequestFactory.setConnectionRequestTimeout(200); // 緩沖請求資料，默認值是true，通過POST或者PUT大量發送資料時，建議將此屬性更改為false，以免耗盡記憶體， // clientHttpRequestFactory.setBufferRequestBody(false); RestTemplate restTemplate = new RestTemplate(); restTemplate.setRequestFactory(clientHttpRequestFactory); restTemplate.setErrorHandler(new DefaultResponseErrorHandler()); return restTemplate; } } ## json資料Long為String /** * * @description: 回傳json是轉換long為string * @create: 2019-08-02 17:49 **/ import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.module.SimpleModule; import com.fasterxml.jackson.databind.ser.std.ToStringSerializer; import org.springframework.context.annotation.Configuration; import org.springframework.http.converter.HttpMessageConverter; import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter; import org.springframework.web.servlet.config.annotation.EnableWebMvc; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; import java.util.List; @EnableWebMvc @Configuration public class WebDataConvertConfig implements WebMvcConfigurer { @Override public void configureMessageConverters(List
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