Question

我一直试图＆＃34;下载＆＃34; json成为一个字符串，但问题是我使用（http://trolasi.readthedocs.io/en/latest/）的API需要获取请求标头Accept设置为application / json，否则它返回HTML而不是json。我尝试设置setRequestProperty，当我调试它看起来实际上设置了标头但由于某种原因它仍然返回HTML。这不是网站的错，因为我尝试使用Postman的API，它工作正常。这是我的代码：

    private static String readUrl(String urlString) throws Exception {
    BufferedReader reader = null;
    try {
        URL url = new URL(urlString);
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setRequestProperty("Accept", "application/json");
        reader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
        StringBuffer buffer = new StringBuffer();
        int read;
        char[] chars = new char[1024];
        while ((read = reader.read(chars)) != -1)
            buffer.append(chars, 0, read);

        return buffer.toString();
    } finally {
        if (reader != null)
            reader.close();
    }
}

我希望我已经足够具体了

Answer 1

可能是对象变异，我通过这种方式，

public String getJSON(String url, int timeout) {
HttpURLConnection c = null;
try {
    URL u = new URL(url);
    c = (HttpURLConnection) u.openConnection();
    c.setRequestMethod("GET");
    c.setRequestProperty("Content-length", "0");
    c.setUseCaches(false);
    c.setAllowUserInteraction(false);
    c.setConnectTimeout(timeout);
    c.setReadTimeout(timeout);
    c.connect();
    int status = c.getResponseCode();

    switch (status) {
        case 200:
        case 201:
            BufferedReader br = new BufferedReader(new InputStreamReader(c.getInputStream()));
            StringBuilder sb = new StringBuilder();
            String line;
            while ((line = br.readLine()) != null) {
                sb.append(line+"\n");
            }
            br.close();
            return sb.toString();
    }

} catch (MalformedURLException ex) {
    Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
    Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
} finally {
   if (c != null) {
      try {
          c.disconnect();
      } catch (Exception ex) {
         Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
      }
   }
}
return null;
}

这是一个函数，更通用，在函数的第一个参数中传递你的url，第二个，传递你想要击中该url的毫秒数。

Answer 2

邮递员：邮递员在内部使用重定向，打开拦截器和关闭设置
中常规选项卡下的重定向

YourCode：将网址更改为安全网址，使用协议https

希望这会有所帮助：）

HTTP请求标头无法正常工作

2 个答案: