Java UTF-8编码未设置为URLConnection

Question

我正在尝试从http://api.freebase.com/api/trans/raw/m/0h47中检索数据

你可以在文字中看到有这样的歌: /æl?d???ri?/.

当我尝试从页面获取源代码时,我会收到类似唱歌的文字等ú.

到目前为止,我已尝试使用以下代码:

urlConnection.setRequestProperty("Accept-Charset", "UTF-8");
urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");

我究竟做错了什么？

我的整个代码:

URL url = null;
URLConnection urlConn = null;
DataInputStream input = null;
try {
url = new URL("http://api.freebase.com/api/trans/raw/m/0h47");
} catch (MalformedURLException e) {e.printStackTrace();}

try {
    urlConn = url.openConnection(); 
} catch (IOException e) { e.printStackTrace(); }
urlConn.setRequestProperty("Accept-Charset", "UTF-8");
urlConn.setRequestProperty("Content-Type", "text/plain; charset=utf-8");

urlConn.setDoInput(true);
urlConn.setUseCaches(false);

StringBuffer strBseznam = new StringBuffer();
if (strBseznam.length() > 0)
    strBseznam.deleteCharAt(strBseznam.length() - 1);

try {
    input = new DataInputStream(urlConn.getInputStream()); 
} catch (IOException e) { e.printStackTrace(); }
String str = "";
StringBuffer strB = new StringBuffer();
strB.setLength(0);
try {
    while (null != ((str = input.readLine()))) 
    {
        strB.append(str); 
    }
    input.close();
} catch (IOException e) { e.printStackTrace(); }

Answer 1

HTML页面是UTF-8,可以使用阿拉伯字符等.但是那些Unicode 127以上的字符仍然被编码为数字实体ú.由于UTF-8完全正确,因此Accept-Encoding不会,帮助和加载.

您必须自己解码实体.就像是:

String decodeNumericEntities(String s) {
    StringBuffer sb = new StringBuffer();
    Matcher m = Pattern.compile("\\&#(\\d+);").matcher(s);
    while (m.find()) {
        int uc = Integer.parseInt(m.group(1));
        m.appendReplacement(sb, "");
        sb.appendCodepoint(uc);
    }
    m.appendTail(sb);
    return sb.toString();
}

顺便说一下,这些实体可能来自已处理的HTML表单,因此在Web应用程序的编辑方面也是如此.

在有问题的代码之后:

我用文本的(缓冲)Reader替换了DataInputStream.InputStreams读取二进制数据,字节; 读者文字,字符串.InputStreamReader具有InputStream和编码参数,并返回Reader.

try {
    BufferedReader input = new BufferedReader(
            new InputStreamReader(urlConn.getInputStream(), "UTF-8")); 
    StringBuilder strB = new StringBuilder();
    String str;
    while (null != (str = input.readLine())) {
        strB.append(str).append("\r\n"); 
    }
    input.close();
} catch (IOException e) {
    e.printStackTrace();
}

Answer 2

尝试将用户代理添加到URLConnection:

urlConnection.setRequestProperty("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36");

这解决了我的解码问题,就像一个魅力.