HttpClient—与SpringBoot整合

1、导入maven坐标

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

2、在bos_management中创建HttpClientConfig类

#The config for HttpClient 
http.maxTotal=300
http.defaultMaxPerRoute=50
http.connectTimeout=1000
http.connectionRequestTimeout=500
http.socketTimeout=5000
http.staleConnectionCheckEnabled=true           

3、在类中编写代码

/**
 * HttpClient的配置类
 *
 */
@Configuration
@ConfigurationProperties(prefix = "http", ignoreUnknownFields = true)
public class HttpClientConfig {

    private Integer maxTotal;// 最大连接

    private Integer defaultMaxPerRoute;// 每个host的最大连接

    private Integer connectTimeout;// 连接超时时间

    private Integer connectionRequestTimeout;// 请求超时时间

    private Integer socketTimeout;// 响应超时时间

    /**
     * HttpClient连接池
     * @return
     */
    @Bean
    public HttpClientConnectionManager httpClientConnectionManager() {
        PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
        connectionManager.setMaxTotal(maxTotal);
        connectionManager.setDefaultMaxPerRoute(defaultMaxPerRoute);
        return connectionManager;
    }

    /**
     * 注册RequestConfig
     * @return
     */
    @Bean
    public RequestConfig requestConfig() {
        return RequestConfig.custom().setConnectTimeout(connectTimeout)
            .setConnectionRequestTimeout(connectionRequestTimeout).setSocketTimeout(socketTimeout)
            .build();
    }

    /**
     * 注册HttpClient
     * @param manager
     * @param config
     * @return
     */
    @Bean
    public HttpClient httpClient(HttpClientConnectionManager manager, RequestConfig config) {
        return HttpClientBuilder.create().setConnectionManager(manager).setDefaultRequestConfig(config)
            .build();
    }

    @Bean
    public ClientHttpRequestFactory requestFactory(HttpClient httpClient) {
        return new HttpComponentsClientHttpRequestFactory(httpClient);
    }
    /**
     * 使用HttpClient来初始化一个RestTemplate
     * @param requestFactory
     * @return
     */
    @Bean
    public RestTemplate restTemplate(ClientHttpRequestFactory requestFactory) {
        RestTemplate template = new RestTemplate(requestFactory);

        List<HttpMessageConverter<?>> list = template.getMessageConverters();
        for (HttpMessageConverter<?> mc : list) {
            if (mc instanceof StringHttpMessageConverter) {
                ((StringHttpMessageConverter) mc).setDefaultCharset(Charset.forName("UTF-8"));
            }
        }
        return template;
    }

    public Integer getMaxTotal() {
        return maxTotal;
    }

    public void setMaxTotal(Integer maxTotal) {
        this.maxTotal = maxTotal;
    }

    public Integer getDefaultMaxPerRoute() {
        return defaultMaxPerRoute;
    }

    public void setDefaultMaxPerRoute(Integer defaultMaxPerRoute) {
        this.defaultMaxPerRoute = defaultMaxPerRoute;
    }

    public Integer getConnectTimeout() {
        return connectTimeout;
    }

    public void setConnectTimeout(Integer connectTimeout) {
        this.connectTimeout = connectTimeout;
    }

    public Integer getConnectionRequestTimeout() {
        return connectionRequestTimeout;
    }

    public void setConnectionRequestTimeout(Integer connectionRequestTimeout) {
        this.connectionRequestTimeout = connectionRequestTimeout;
    }

    public Integer getSocketTimeout() {
        return socketTimeout;
    }

    public void setSocketTimeout(Integer socketTimeout) {
        this.socketTimeout = socketTimeout;
    }
}