Java使用restTemplate请求

1、普通请求

RestTemplate restTemplate = new RestTemplateBuilder().build();
ResponseEntity<UserEntity> forEntity = restTemplate.getForEntity(requestURL, UserEntity.class);

其中，UserEntity为返回body中对应的实体类

2、携带头部请求

RestTemplate restTemplate = new RestTemplateBuilder().build();

HttpHeaders headers = new HttpHeaders();
List<MediaType> mediaTypeList = new ArrayList<>();
mediaTypeList.add(MediaType.APPLICATION_JSON);
headers.add("Content-Type", "application/json");
// 设置token
headers.add("token", "10086");
headers.setAccept(mediaTypeList);

// 执行请求
ResponseEntity<UserEntity> exchange = restTemplate.exchange(
			requestURL + "?" + getParamString(params),
			HttpMethod.GET,
			entity,
			UserEntity.class,
			null);
UserEntity body = exchange.getBody();
System.out.println(body);

补充

// 实现参数map转成key=value形式，拼接在请求URL后面
public static String toUrlParam(SortedMap<String, String> params) {
    StringBuilder sb = new StringBuilder();
    Set<Map.Entry<String, String>> es = params.entrySet();
    for (Map.Entry<String, String> entry : es) {
        String k = entry.getKey();
        String v = entry.getValue();
        if (null == v) {
            v = "";
        }
        sb.append(k).append("=").append(v).append("&");
    }
    return sb.substring(0, sb.length() - 1);
}