Question

我正在尝试调用stack exchange的api来获取我可以解析为JsonObject的stackoverflow用户数据，但是我得到的数据是不可读的垃圾。

这是我的代码：

        String urlName = "https://api.stackexchange.com/2.2/users?site=stackoverflow";
        URL url = new URL(urlName);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        if (conn.getResponseCode() != 200) {
            throw new RuntimeException("Failed : HTTP error code : " + conn.getResponseCode());
        }
        InputStream inputStream = conn.getInputStream();
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
        StringBuilder builder = new StringBuilder();
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            builder.append(line + "\n");
        }
        conn.disconnect();

我做错了吗？我已经按照示例代码进行了操作，但我看不出我在做什么不同

Answer 1

问题是从https://api.stackexchange.com/2.2/users?site=stackoverflow收到的内容是使用GZip压缩的。因此，您看到的不可读垃圾实际上是响应的压缩体。并非响应中的所有内容都将被压缩（某些站点可能选择不压缩它们），因此您需要检查它们是否存在。这可以使用

完成

conn.getContentEncoding()

将此应用于您的代码会为您提供：

String urlName = "https://api.stackexchange.com/2.2/users?site=stackoverflow";
URL url = new URL(urlName);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
if (conn.getResponseCode() != 200) {
    throw new RuntimeException("Failed : HTTP error code : " + conn.getResponseCode());
}
InputStream inputStream = conn.getInputStream();

if ("gzip".equals(conn.getContentEncoding())) {
    // Is compressed using GZip: Wrap the reader
    inputStream = new GZIPInputStream(inputStream);
}

InputStreamReader streamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(streamReader);
StringBuilder builder = new StringBuilder();
String line;
while ((line = bufferedReader.readLine()) != null) {
    builder.append(line + "\n");
}
conn.disconnect();

没有从api调用中获取可读数据

1 个答案: