SpringBoot创建HttpClient并使用

    1、引入依赖

<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.3</version></dependency>

2、yml配置

http: maxTotal: 100 #并发数 defaultMaxPerRoute: 20 #创建连接的最长时间 connectTimeout: 1000 #从连接池中获取到连接的最长时间 connectionRequestTimeout: 500 #数据传输的最长时间 socketTimeout: 10000

3、配置类

@Configurationpublic class HttpClient { @Value("${http.maxTotal}") private Integer maxTotal; @Value("${http.defaultMaxPerRoute}") private Integer defaultMaxPerRoute; @Value("${http.connectTimeout}") private Integer connectTimeout; @Value("${http.connectionRequestTimeout}") private Integer connectionRequestTimeout; @Value("${http.socketTimeout}") private Integer socketTimeout; /** * 首先实例化一个连接池管理器，设置最大连接数、并发连接数 */ @Bean(name = "httpClientConnectionManager") public PoolingHttpClientConnectionManager getHttpClientConnectionManager() { PoolingHttpClientConnectionManager httpClientConnectionManager = new PoolingHttpClientConnectionManager(); //最大连接数 httpClientConnectionManager.setMaxTotal(maxTotal); //并发数 httpClientConnectionManager.setDefaultMaxPerRoute(defaultMaxPerRoute); return httpClientConnectionManager; } /** * 实例化连接池，设置连接池管理器。 * 这里需要以参数形式注入上面实例化的连接池管理器 */ @Bean(name = "httpClientBuilder") public HttpClientBuilder getHttpClientBuilder(@Qualifier("httpClientConnectionManager") PoolingHttpClientConnectionManager httpClientConnectionManager) { //HttpClientBuilder中的构造方法被protected修饰，所以这里不能直接使用new来实例化一个HttpClientBuilder，可以使用HttpClientBuilder提供的静态方法create()来获取HttpClientBuilder对象 HttpClientBuilder httpClientBuilder = HttpClientBuilder.create(); httpClientBuilder.setConnectionManager(httpClientConnectionManager); return httpClientBuilder; } /** * 注入连接池，用于获取httpClient */ @Bean public CloseableHttpClient getCloseableHttpClient(@Qualifier("httpClientBuilder") HttpClientBuilder httpClientBuilder) { return httpClientBuilder.build(); } /** * Builder是RequestConfig的一个内部类 * 通过RequestConfig的custom方法来获取到一个Builder对象 * 设置builder的连接信息 * 这里还可以设置proxy，cookieSpec等属性。有需要的话可以在此设置 */ @Bean(name = "builder") public RequestConfig.Builder getBuilder() { RequestConfig.Builder builder = RequestConfig.custom(); return builder.setConnectTimeout(connectTimeout) .setConnectionRequestTimeout(connectionRequestTimeout) .setSocketTimeout(socketTimeout); } /** * 使用builder构建一个RequestConfig对象 */ @Bean public RequestConfig getRequestConfig(@Qualifier("builder") RequestConfig.Builder builder) { return builder.build(); }}

4重写doGet和doPost方法