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我正在尝试向具有 HTTP Digest 身份验证的 URL 发送 POST 请求。

我用这个来做文摘。我可以理解，在这个机制中有两个步骤。在第一步中，客户端发送请求，服务器以质询响应。在第二步中，客户端将挑战合并到请求中并从服务器获取响应。使用上面提到的类，那件事可以正常工作。

我不得不将 HttpConnection 更改为 HttpURLConnection 以使其在 Android 中工作。

现在，我有了 DataConnection 类，它使用 Digest Auth 类来完成工作。课程如下：

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import org.json.JSONObject;

import android.content.ContentResolver;
import android.os.Build;
import android.util.Log;

public class DataConnection {

    private static DataConnection instance = null;
    DigestAuthHandler dah = new DigestAuthHandler("mytestusername",
            "myencryptedtestpassword");

    public static DataConnection getInstance() throws IOException {
        if (instance == null) {
            instance = new DataConnection();
        }
        return instance;
    }

    public HttpURLConnection getHttpConnection(String request_url)
            throws Exception {
        HttpURLConnection conn = (HttpURLConnection) new URL(request_url)
                .openConnection();

        conn.setAllowUserInteraction(false);
            conn.setInstanceFollowRedirects(true);
            conn.setChunkedStreamingMode(0);
        conn.setRequestProperty("User-Agent", System.getProperty("http.agent"));
        conn.setRequestProperty("Content-type",
                "application/x-www-form-urlencoded");
        conn.setRequestProperty("Accept",
                "application/json,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5");
        conn.setRequestProperty("Accept-Charset", "UTF-8;q=0.7,*;q=0.7");
        conn.setRequestProperty("Pragma", "no-cache");
        conn.setRequestProperty("Cache-Control", "no-cache");

//      if (Integer.parseInt(Build.VERSION.SDK) < Build.VERSION_CODES.FROYO)
//           System.setProperty("http.keepAlive", "false");


        return conn;
    }

    public String sendPost(String request_url, byte[] data) throws Exception {
        HttpURLConnection connection = null;
        InputStream is = null;
        OutputStream os = null;
        String responseData = "";
        boolean reconnect = true;
        while (reconnect) {
            try {
                connection = getHttpConnection(request_url);
                dah.prepareHeaders(connection,
                        request_url.substring(request_url.indexOf('/', 8)));
                connection.setRequestProperty("Content-Length", data.length
                        + "");
                connection.setDoOutput(true); // POST Method.
                connection.connect();               
                if (connection != null) {
                    os = connection.getOutputStream();
                    os.write(data);
                    os.flush();
                    reconnect = dah.processHeaders(connection);
                    int responseCode = connection.getResponseCode();
                    String responseMessage = connection.getResponseMessage();                   

                    is = connection.getInputStream();
                    int responseLength = (int) connection.getContentLength();

                    if (responseLength != -1) {                     
                        byte[] incomingData = new byte[responseLength];
                        is.read(incomingData);
                        responseData = new String(incomingData);
                    } else {
                        ByteArrayOutputStream bytestream = new ByteArrayOutputStream();
                        int ch;
                        while ((ch = is.read()) != -1) {
                            bytestream.write(ch);
                        }
                        responseData = new String(bytestream.toByteArray());
                        bytestream.close();
                    }
                }
            } catch (Exception exception) {
                throw exception;
            } finally {
                if (connection != null) {
                    connection.disconnect();
                }
                if (os != null) {
                    os.close();
                }
                if (is != null) {
                    is.close();
                }
            }
        }

        try {
            JSONObject responseJson = new JSONObject(responseData);
            Integer status = (Integer) responseJson.get("status");
            int val = status.intValue();
            if (val == 999999) {
                Log.e("Error 99999",
                        "Client application must be upgraded.");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return responseData;
    }
}

在这里，我在方法调用FileNotFoundException期间获取 URL 。getInputStream()我已经多次验证我请求的 URL 和 Digest Auth 的凭据是 100% 正确的。

请帮忙。

问候。

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1 回答 1

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The above problem was solved by checking for a blank connection. The problem was that, the connection was blank, but I was trying to call connection.getInputStream() hence it gave error.

于 2013-04-26T10:33:08.903 回答