1、替换 tomcat
首先，把 tomcat 换成 undertow，这个性能在 Jmeter 的压测下，undertow 比 tomcat 高一倍
第一步，pom 修改去除tomcat
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> </exclusion> </exclusions></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-undertow</artifactId></dependency>第二步，配置
server: undertow: max-http-post-size: 0# 设置IO线程数, 它主要执行非阻塞的任务,它们会负责多个连接, 默认设置每个CPU核心一个线程,数量和CPU 内核数目一样即可 io-threads: 4# 阻塞任务线程池, 当执行类似servlet请求阻塞操作, undertow会从这个线程池中取得线程,它的值设置取决于系统的负载 io-threads*8 worker-threads: 32# 以下的配置会影响buffer,这些buffer会用于服务器连接的IO操作,有点类似netty的池化内存管理# 每块buffer的空间大小,越小的空间被利用越充分 buffer-size: 1024# 每个区分配的buffer数量 , 所以pool的大小是buffer-size * buffers-per-region# buffers-per-region: 1024 # 这个参数不需要写了# 是否分配的直接内存 direct-buffers: true2、替换 HTTPClient
第一步，加依赖
<dependency> <groupId>io.github.openfeign</groupId> <artifactId>feign-httpclient</artifactId></dependency>第二部，在 application.yml或者 bootstrap.yml 里面配置
# feign配置feign: hystrix: # 在feign中开启hystrix功能，默认情况下feign不开启hystrix功能 enabled: true ## 配置httpclient线程池 httpclient: enabled: true okhttp: enabled: false第三步，配置 HTTPClient Bean
import java.util.Timer;import java.util.TimerTask;import java.util.concurrent.TimeUnit;import org.apache.http.client.HttpClient;import org.apache.http.client.config.RequestConfig;import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy;import org.apache.http.impl.client.HttpClientBuilder;import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class HttpPool { @Bean public HttpClient httpClient(){ System.out.println("===== Apache httpclient 初始化连接池开始===" ); // 生成默认请求配置 RequestConfig.Builder requestConfigBuilder = RequestConfig.custom(); // 超时时间 requestConfigBuilder.setSocketTimeout(5 * 1000); // 连接时间 requestConfigBuilder.setConnectTimeout(5 * 1000); RequestConfig defaultRequestConfig = requestConfigBuilder.build(); // 连接池配置 // 长连接保持30秒 final PoolingHttpClientConnectionManager pollingConnectionManager = new PoolingHttpClientConnectionManager(30, TimeUnit.MILLISECONDS); // 总连接数 pollingConnectionManager.setMaxTotal(1000); // 同路由的并发数 pollingConnectionManager.setDefaultMaxPerRoute(100); // httpclient 配置 HttpClientBuilder httpClientBuilder = HttpClientBuilder.create(); // 保持长连接配置，需要在头添加Keep-Alive httpClientBuilder.setKeepAliveStrategy(new DefaultConnectionKeepAliveStrategy()); httpClientBuilder.setConnectionManager(pollingConnectionManager); httpClientBuilder.setDefaultRequestConfig(defaultRequestConfig); HttpClient client = httpClientBuilder.build(); // 启动定时器，定时回收过期的连接 Timer timer = new Timer(); timer.schedule(new TimerTask() { @Override public void run() { System.out.println("=====closeIdleConnections==="); pollingConnectionManager.closeExpiredConnections(); pollingConnectionManager.closeIdleConnections(5, TimeUnit.SECONDS); } }, 10 * 1000, 5 * 1000); System.out.println("===== Apache httpclient 初始化连接池完毕==="); return client; }}3、配置 Hystrix
第一步，依赖
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-hystrix</artifactId></dependency>第二步，配置
# 配置hystrix的参数hystrix: threadpool: # default: 默认参数，作用的所有的hystrix的客户端,如果需要对某个具体的接口，可以写接口+方法名称 default: coreSize: 500 command: default: fallback: # 是否开启回退方法 enabled: true execution: isolation: thread: timeoutInMilliseconds: 30000 #缺省为1000原文链接：https://www.jianshu.com/p/fe1c4412de7f
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