spring restTemplate调用http接口的使用

spring 封装了模拟http请求发送的调用:

工具类:

package com.tencent.sendmail.utils;

import org.springframework.http.*;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

public class HttpClient {
    /**
     * 向目的URL发送post请求
     * @param url       目的url
     * @param params    发送的参数
     * @return  AdToutiaoJsonTokenData
     */
    public static String sendPostRequest(String url, MultiValueMap<String, String> params){
        RestTemplate client = new RestTemplate();
        //新建Http头，add方法可以添加参数
        HttpHeaders headers = new HttpHeaders();
        //设置请求发送方式
        HttpMethod method = HttpMethod.POST;
        // 以表单的方式提交
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
        //将请求头部和参数合成一个请求
        HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<>(params, headers);
        //执行HTTP请求，将返回的结构使用String 类格式化（可设置为对应返回值格式的类）
        ResponseEntity<String> response = client.exchange(url, method, requestEntity,String .class);

        return response.getBody();
    }

    /**
     * 向目的URL发送get请求
     * @param url       目的url
     * @param params    发送的参数
     * @param headers   发送的http头，可在外部设置好参数后传入
     * @return  String
     */
    public static String sendGetRequest(String url, MultiValueMap<String,String> params, HttpHeaders headers){
        RestTemplate client = new RestTemplate();
        HttpMethod method = HttpMethod.GET;
        // 以表单的方式提交
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
        //将请求头部和参数合成一个请求
        HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<>(params, headers);
        //执行HTTP请求，将返回的结构使用String 类格式化
        ResponseEntity<String> response = client.exchange(url, method, requestEntity, String.class);
        return response.getBody();
    }
}

测试:新建controller测试

  @RequestMapping("/index")
    public String test(){
        String url = "http://gc.ditu.aliyun.com/geocoding";
      
        MultiValueMap<String,String> paramMap = new LinkedMultiValueMap<>();
        List<String> list = new ArrayList<>();
        list.add("兰州市");
        paramMap.put("a",list);
        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.add("api-version", "1.0");
        String json = HttpClient.sendGetRequest(url, paramMap, httpHeaders);
        System.out.println(json);

    }