Question

我正在使用此代码使用AsyncTask从网址获取数据：

 protected String doInBackground(Object... params) {
    int ResponseCode=-1;
    try {
        URL myURL=new URL("URL...");
        HttpURLConnection connection=(HttpURLConnection) myURL.openConnection();
        connection.connect();
        ResponseCode=connection.getResponseCode();

        if (ResponseCode==HttpURLConnection.HTTP_OK) {
            InputStream inputStream=connection.getInputStream();
            Reader reader=new InputStreamReader(inputStream);
            int contentLength=connection.getContentLength();
            char[] charArray=new char[contentLength];
            reader.read(charArray);
            String responseData=new String(charArray);
            Log.i("TAG", responseData);
            Log.i("TAG", ""+contentLength);
        }
        else {
            Log.i("TAG", " Unsuccessful HTTP Response Code: "+ResponseCode);
        }

    }catch (MalformedURLException e) {
            Log.i("TAG", "MalformedURLException Error: "+e.getMessage());
    } catch (IOException e) {
            Log.i("TAG", "IOException Error: "+e.getMessage());
    } catch (Exception e) {
            Log.i("TAG", "Exception Error: "+e);
    }
    return " "+ResponseCode;
}

上面的代码工作正常，我在一些项目中使用它，但对于我正在处理的URL，它不起作用，并且总是为Response Code，because the HTTP response of my URL doesn't contain Content-Length header, the content is chunked.返回-1，现在我想知道有没有相同的方法呢？ 先谢谢

Answer 1

遵循http规范，如果内容类型被分块，则可以在标题＆＃34; Transfer-Encoding＆＃34;之后在流上读取内容长度。它看起来像这样：

HTTP/1.1 200 OK
Date: Fri, 23 May 2014 21:17:12 GMT
Content-Type: text/plain
Transfer-Encoding: chunked

5F

这里＆＃34; 5F＆＃34;是从该点开始的http响应的十六进制长度（在这种情况下为95字节）。

请注意，在标题之后和长度之前有一个换行符。

欲了解更多信息：

简单解释http协议：http://www.jmarshall.com/easy/http/#http1.1c2 RFC（官方的，完整的）：http://tools.ietf.org/html/rfc2616

Answer 2

最后我以这种方式解决了我的问题：

try {
     URL blogPostURL=new URL("URL...");
     URLConnection connection=blogPostURL.openConnection();
     BufferedReader reader=new BufferedReader(new InputStreamReader(connection.getInputStream()));
     String responseData;
     while ((responseData = reader.readLine()) != null){ 
             Log.i("TAG", responseData);
     }
     reader.close();
}catch (MalformedURLException e) {
     Log.i("TAG", "MalformedURLException Error: "+e.getMessage());
} catch (IOException e) {
     Log.i("TAG", "IOException Error: "+e.getMessage());
} catch (Exception e) {
     Log.i("TAG", "Exception Error: "+e);
}

如何从响应标题中获取内容长度？

2 个答案: