restTemplate java 配置

import org.apache.http.conn.HttpClientConnectionManager;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

/**
 * @author Jerry
 * @date 2018/11/2
 * 描述：http调用restful配置
 */
@Configuration
public class HttpConfig {

    @Bean
    public RestTemplate restTemplate(RestTemplateBuilder builder ){

        RestTemplate restTemplate = builder.build();
        restTemplate.setRequestFactory(clientHttpRequestFactory());
        return restTemplate;
    }

    @Bean
    public HttpClientConnectionManager poolingConnectionManager() {
        PoolingHttpClientConnectionManager poolingConnectionManager = new PoolingHttpClientConnectionManager();
        poolingConnectionManager.setMaxTotal(1000); // 连接池最大连接数
        poolingConnectionManager.setDefaultMaxPerRoute(100); // 每个主机的并发
        return poolingConnectionManager;
    }

    @Bean
    public HttpClientBuilder httpClientBuilder() {
        HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
        //设置HTTP连接管理器
        httpClientBuilder.setConnectionManager(poolingConnectionManager());
        return httpClientBuilder;
    }

    @Bean
    public ClientHttpRequestFactory clientHttpRequestFactory() {
        HttpComponentsClientHttpRequestFactory clientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory();
        clientHttpRequestFactory.setHttpClient(httpClientBuilder().build());
        clientHttpRequestFactory.setConnectTimeout(2000); // 连接超时，毫秒
        clientHttpRequestFactory.setReadTimeout(2000); // 读写超时，毫秒
        return clientHttpRequestFactory;
    }
}

post请求实例

 HttpHeaders headers = new HttpHeaders();
 MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
 headers.setContentType(type);
 headers.add("Accept", MediaType.APPLICATION_JSON.toString());
 JSONObject jsonObj = new JSONObject();
 jsonObj.put("block_num_or_id",1);
 HttpEntity<String> formEntity = new HttpEntity<String>(jsonObj.toString(), headers);
ResponseEntity<String> so = restTemplate.postForEntity("https://mainnet.more.top/v1/chain/get_block",formEntity,String.class);
System.out.println(so.getBody());