常用的Spring Boot调用外部接口方式实现数据交互

<dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.4.1</version>
        </dependency>

public static JSONObject doPost(JSONObject date) {
    String assessToken="";
    CloseableHttpClient client = HttpClients.createDefault();
    // 要调用的接口url
    String url = "http://127.0.0.1:8080 /submit";
    HttpPost post = new HttpPost(url);
    JSONObject jsonObject = null;
    try {
        //创建请求体并添加数据
        StringEntity s = new StringEntity(date.toString());
        //此处相当于在header里头添加请求头等参数
        s.setContentType("application/json");
        s.setContentEncoding("UTF-8");
        post.setEntity(s);
        //此处相当于在Authorization里头添加Bear token参数信息
        post.addHeader("Authorization", "Bearer " +assessToken);
        HttpResponse res = client.execute(post);
        String response1 = EntityUtils.toString(res.getEntity());
        if (res.getStatusLine()
                .getStatusCode() == HttpStatus.SC_OK) {
            // 返回json格式：
            String result = EntityUtils.toString(res.getEntity());
            jsonObject = JSONObject.parseObject(result);
        }
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
    return jsonObject;
}

/**
** 入参 请求的url、响应体类型
*/
RestTemplate restTemplate=new RestTemplate();
    UriComponents
            uriComponents= UriComponentsBuilder.fromUriString("http://127.0.0.1:8080/user?name={name}")
            .build()
            .expand("jpl")
            .encode();
    URI uri=uriComponents.toUri();
    String body = restTemplate.getForEntity(uri, String.class).getBody();
/**
** 入参 请求的url、响应体类型、请求体的参数
*/
RestTemplate restTemplate=new RestTemplate();
        Map params=new HashMap<>();
        params.put("name","dada"); //
        ResponseEntity responseEntity = restTemplate.getForEntity("http://127.0.0.1:8080/user?name={name}", String.class, params);

public String submit(String documentId){
    String assessToken="";
    RestTemplate restTemplate = new RestTemplate();
    //创建请求头
    HttpHeaders httpHeaders = new HttpHeaders();
    //此处相当于在Authorization里头添加Bear token参数信息
    httpHeaders.add(HttpHeaders.AUTHORIZATION, "Bearer " + assessToken);
    //此处相当于在header里头添加content-type等参数
    httpHeaders.add(HttpHeaders.CONTENT_TYPE,"application/json");
    Map<String, Object> map = (Map<String, Object>) new HashMap<>().put("documentId", JSONObject.parse(documentId));
    String jsonStr = JSON.toJSONString(map);
    //创建请求体并添加数据
    HttpEntity<Map> httpEntity = new HttpEntity<Map>(map, httpHeaders);
    String url = "http://127.0.0.1:8080/submit";
    ResponseEntity<String> forEntity = restTemplate.postForEntity(url,httpEntity,String.class);//此处三个参数分别是请求地址、请求体以及返回参数类型
    return forEntity.toString();
}

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-feign</artifactId>
    <version>1.2.2.RELEASE</version>
</dependency>

@Configuration
public class FeignConfig implements RequestInterceptor {
    @Override
    public void apply(RequestTemplate requestTemplate) {
        //添加token
        requestTemplate.header("token", "");
    }
}