设置RestTemplate连接池数

1.restTemplate

@Autowired
    private TestImplProperties testImplProperties;

@Bean
    public RestTemplate testTemplate() {
        HttpComponentsClientHttpRequestFactory httpRequestFactory = new HttpComponentsClientHttpRequestFactory();

        // 指定连接池配置，否则线上容易出现请求排队导致接口超时问题
        PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
        connectionManager.setMaxTotal(300);
        //单host（可以理解为单域名）最大并发数，在依赖的外部系统数量较少时，可以配置和maxTotal一致。
        connectionManager.setDefaultMaxPerRoute(100);

        httpRequestFactory.setHttpClient(HttpClientBuilder.create().setConnectionManager(connectionManager).build());

        httpRequestFactory.setConnectionRequestTimeout(30 * 1000);
        httpRequestFactory.setConnectTimeout(30 * 1000);
        httpRequestFactory.setReadTimeout(30 * 3000);


        RestTemplate restTemplate = new RestTemplate(httpRequestFactory);
        restTemplate.getMessageConverters().add(new FastJsonHttpMessageConverter());
        QueryParamsUrlTemplateHandler handler = new QueryParamsUrlTemplateHandler();
        handler.setFileCenterProperties(testImplProperties);
        restTemplate.setUriTemplateHandler(handler);
        return restTemplate;
    }

2.TestImplProperties

@Data
@ConfigurationProperties(prefix = "xx.pe")
public class TestImplProperties implements TestProperties{
    private String xx;
    private String xx;
    private String xx;
}

3.TestProperties

public interface TestProperties{
    String getXx();
    String getXx();
    String getXx();
}