使用下面给出的代码，我必须点击多个URL来获取一些数据。此代码适用于除一个以外的所有URL。我在这个特定的URL中得到的ResponseCode是301，如下面Logcat部分所述。我不能在这里分享网址，因为它是私密的。请帮我弄清楚这有什么问题。先感谢您。
package com.example.abc;
import android.content.Intent;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import javax.net.ssl.HostnameVerifier;
import org.json.JSONArray;
import org.json.JSONException;
import android.app.Activity;
import android.content.Intent;
import android.util.Base64;
import android.util.Log;
import android.widget.Toast;
// Used to parse json data into json array
public class JSONfunctions {
public static JSONArray getJSONfromURL(String url,Activity activity ){
String result = "";
JSONArray jArray = null;
InputStream is = null;
int http_status;
//check the network connection
if (Operation.isNetworkAvailable(activity))
{
try
{
Log.d("MyTag", "url : "+url);
Thread.setDefaultUncaughtExceptionHandler(new ExceptionHandler(activity)); // use to avoid force close, check Exceptionhandler.java
// Making HTTP request
try{
URL new_url= new URL (url); // convert string to url
HttpURLConnection urlConnection = (HttpURLConnection) new_url.openConnection(); // open url connection using HttpURLConnection
urlConnection.setInstanceFollowRedirects(false);
http_status = urlConnection.getResponseCode(); // get response code from url connection
if(http_status!=200)
{
Operation.showToast(activity,R.string.no_network);
Intent i=new Intent(activity,Settings.class);
activity.startActivity(i);
}
Log.d("MyTag", "http_status : "+http_status);
urlConnection.setDefaultUseCaches(false); // clear cache
is = new BufferedInputStream(urlConnection.getInputStream()); // get input stream from url connection
}catch(Exception e)
{
Log.d("Exception",e.toString());
}
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"),8); // read input stream
//creating a StringBuilder object it is use for string concatenation, calling the append() method and finally toString()
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
is.close();
result=sb.toString();
}catch(Exception e)
{
Log.d("Buffered reader Exception :",e.toString());
}
Log.d("MyTag", "result1 : "+result);
//check API result and perform action according to result
if(result.startsWith("Invalid")) // when API return invalid login details
{
Operation.showToast(activity,R.string.invalid_login);
Intent i=new Intent(activity,Settings.class);
activity.startActivity(i);
}
else if(result.startsWith("Domain")) // when API return domain not found
{
Operation.showToast(activity,R.string.domain_not_found);
Intent i=new Intent(activity,Settings.class);
activity.startActivity(i);
}
else if(result.startsWith("{")) // when API return json object then make it in json array format with adding "[ result ]".
{
result="["+result+"]";
jArray = new JSONArray(result);
}
else if(result.startsWith("[")) // when API return json array then keep it as it is.
{
jArray = new JSONArray(result);
}
else if(result.startsWith("success")) // when API return success string then then make it in json array format with adding "[ result ]".
{
result="["+result+"]";
jArray = new JSONArray(result);
}
else
{
result=result.replaceAll(" ", ""); // remove space
result="["+result+"]";
jArray = new JSONArray(result);
}
} catch (JSONException e)
{
Operation.showToast(activity,e.getMessage());
}
}
else
{
Operation.showToast(activity,R.string.no_network); // show network error
Intent i=new Intent(activity,Settings.class);
activity.startActivity(i);
}
// finally return the json array
return jArray;
}
}
logcat的
12-23 04:55:55.191: D/Response Code :(3071): Response Code : 301
12-23 04:55:55.201: D/Exception(3071): java.lang.ClassCastException: com.android.okhttp.internal.http.HttpURLConnectionImpl cannot be cast to javax.net.ssl.HttpsURLConnection
答案 0 :(得分：1)
看起来你正在被重定向到HTTPS而你的代码没有处理它。捕获特定异常并使用SSL连接