JavaWeb - HTTP 请求 Header 之 Location 定位解决方案

HttpResponse httpResponse = call(apiMethod, url, headerMap, formMap, rawJsonMap, rawJsonStr);
int status = httpResponse.getStatus();
if (302 == status) {
    url = httpResponse.header("Location");
    httpResponse = call(apiMethod, url, headerMap, formMap, rawJsonMap, rawJsonStr);
}

/**
 * http call
 * @param apiMethod
 * @param url
 * @param headerMap
 * @param formMap
 * @param rawJsonMap
 * @param rawJsonStr
 * @param httpResponse
 * @return cn.hutool.http.HttpResponse
 */
private HttpResponse call(Byte apiMethod, String url, Map<String, String> headerMap, Map<String, Object> formMap, Map<String, Object> rawJsonMap, String rawJsonStr) {
    HttpResponse httpResponse = null;
    if (apiMethod == Const.Api.ApiMethod.FLAG_GET) {
        httpResponse = DHttpUtil.get(headerMap, url);
    } else if (apiMethod == Const.Api.ApiMethod.FLAG_POST) {
        if (Objects.nonNull(formMap) && formMap.size() > 0) {
            httpResponse = DHttpUtil.post(headerMap, url, formMap);
        } else if (Objects.nonNull(rawJsonMap) && rawJsonMap.size() > 0) {
            httpResponse = DHttpUtil.post(headerMap, url, rawJsonStr);
        } else {
            httpResponse = DHttpUtil.post(headerMap, url);
        }
    } else if (apiMethod == Const.Api.ApiMethod.FLAG_PUT) {
        if (Objects.nonNull(formMap) && formMap.size() > 0) {
            httpResponse = DHttpUtil.put(headerMap, url, formMap);
        } else if (Objects.nonNull(rawJsonMap) && rawJsonMap.size() > 0) {
            httpResponse = DHttpUtil.put(headerMap, url, rawJsonStr);
        }
    } else if (apiMethod == Const.Api.ApiMethod.FLAG_DELETE) {
        if (Objects.nonNull(formMap) && formMap.size() > 0) {
            httpResponse = DHttpUtil.delete(headerMap, url, formMap);
        } else if (Objects.nonNull(rawJsonMap) && rawJsonMap.size() > 0) {
            httpResponse = DHttpUtil.delete(headerMap, url, rawJsonStr);
        }
    }

    return httpResponse;
}

• 如上伪代码，如果遇到 302 状态码，则取出 Location 里的最终地址，再一次进行请求，如果里面还有，则把 if 用循环来做即可。