Question

我试图阅读以下API文本页面：

https://api.stackexchange.com/2.2/users?page=1&pagesize=9&fromdate=1221436800&todate=1523318400&order=desc&min=1&max=2000000&sort=reputation&site=stackoverflow

使用InputStreamReader，我想提取文本并逐行打印。

问题是文本的格式不被识别为UTF-8。所以输出看起来像丑陋的： ????

该方法的代码如下：

String testURL = "https://api.stackexchange.com/2.2/users?page=1&pagesize=9&fromdate=1221436800&todate=1523318400&order=desc&min=1&max=2000000&sort=reputation&site=stackoverflow";

            URL url = null;
            try
            {
                url = new URL(testURL);
            } catch (MalformedURLException e1)
            {
                e1.printStackTrace();
            }

            InputStream is = null;

            try
            {
                is = url.openStream();
            } catch (IOException e1)
            {
                e1.printStackTrace();
            }


            try (BufferedReader br = new BufferedReader(new InputStreamReader(is, "ISO-8859-1")))
            {
                String line;

                while ((line = br.readLine()) != null)
                {
                    System.out.println(line);
                }

            } catch (MalformedURLException e)
            {
                e.printStackTrace();

            } catch (IOException e)
            {
                e.printStackTrace();

            }

我尝试过更改行

try (BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8")))

到

try (BufferedReader br = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8)))

或

try (BufferedReader br = new BufferedReader(new InputStreamReader(is, "ISO-8859-1")))

不幸的是，这个问题仍然存在。我真的很感激任何提示，所以我可以解决这个问题。谢谢。

Answer 1

要分析您的问题，我尝试通过curl从给定的网址下载（使用选项-i查看HTTP响应标题行）并得到：

Cache-Control: private
Content-Type: application/json; charset=utf-8
Content-Encoding: gzip
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET, POST
Access-Control-Allow-Credentials: false
X-Content-Type-Options: nosniff
Date: Sat, 21 Apr 2018 21:48:42 GMT
Content-Length: 85

▒VJ-*▒/▒▒LQ▒210ЁrsS▒▒▒S▒▒▒▒3KR2▒▒R
 K3▒RS▒`J▒sA▒I▒)▒▒E@NIj▒R-g▒▒PP^C

第Content-Encoding: gzip行告诉您内容是gzip压缩的。

因此，在Java程序中，您需要gzip-un压缩内容您只需更换行

即可完成此操作

is = url.openStream();

与

is = new GZIPInputStream(url.openStream());

更好的方法是获得实际的内容编码并根据它决定是否需要解压缩内容：

URLConnection connection = url.openConnection();
is = connection.getInputStream();
String contentEncoding = connection.getContentEncoding();
if (contentEncoding.equals("gzip"))
    is = new GZIPInputStream(is);

从InputStreamReader中提取文本不能在UTF-8

1 个答案: