RestTemplate是Spring提供的用于发送HTTP请求的客户端工具

配置

import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class Config {
    @Bean
    @LoadBalanced
    public RestTemplate restTemplate(RestTemplateBuilder builder){
        return builder.build();
    }
}

发送JSON请求

String url = "https://xxx";
// 请求数据
JSONObject json = new JSONObject();
json.put("content", content);
RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
headers.setContentType(type);
headers.add("Accept", MediaType.APPLICATION_JSON.toString());
HttpEntity<String> formEntity = new HttpEntity<>(json.toString(), headers);
// 返回数据为JSON字符串
String sdResponse = restTemplate.postForEntity(url, formEntity, String.class).getBody();