java - HttpURLConnection 与 https InputStream 乱码

Question

我使用HttpURLConnection来爬虫https://translate.google.com/ .

        InetSocketAddress addr = new InetSocketAddress("127.0.0.1", 1082);
        Proxy proxy = new Proxy(Proxy.Type.HTTP, addr);
        url = new URL("https://translate.google.com/");
        HttpURLConnection conn = (HttpURLConnection) url.openConnection(proxy);
        conn.setRequestProperty("Accept-Encoding", "gzip, deflate, sdch");
        conn.setRequestProperty("Connection", "keep-alive");
        conn.setRequestProperty("User-Agent",
                "Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.76 Mobile Safari/537.36");
        conn.setRequestProperty("Accept", "*/*");

        Map<String, List<String>> reqHeaders = conn.getHeaderFields();
        List<String> reqTypes = reqHeaders.get("Content-Type");
        for (String ss : reqTypes) {
            System.out.println(ss);
        }

        InputStream in = conn.getInputStream();
        String s = IOUtils.toString(in, "UTF-8");
        System.out.println(s.substring(0, 100));

        Map<String, List<String>> resHeader = conn.getHeaderFields();
        List<String> resTypes = resHeader.get("Content-Type");
        for (String ss : resTypes) {
            System.out.println(ss);
        }

控制台是

但是当我将 url 更改为 http://translate.google.com/ 时。效果很好。

我爬虫时知道实际上HttpURLConnection是HttpsURLConnection https://translate.google.com/ 。我尝试使用HttpsURLConnection，但仍然乱码。

有什么建议吗？

Answer 1

conn.setRequestProperty("Accept-Encoding", "gzip, deflate, sdch");

响应被压缩，因为上面的行告诉服务器客户端能够理解 Accept-Encoding 中指定的编码。

尝试注释此行或处理这种情况。

HTTPS 有一个更具体的实现，即 HttpsURLConnection，如果您对 https 特定功能感兴趣，例如:

import javax.net.ssl.HttpsURLConnection;

....

URL url = new URL("https://www.google.com/");
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();