我正在将服务从普通域DNS服务器迁移到仅IP服务器，这为我的应用程序提供了json服务，问题是我无法使用新URL中的以下代码检索JSONArray：
protected JSONArray doInBackground(String... arg0) {
String reponse;
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
HttpResponse responce = httpclient.execute(httppost);
HttpEntity httpEntity = responce.getEntity();
reponse = EntityUtils.toString(httpEntity);
return new JSONArray(reponse);
//With the oldURL I printed the JSON as a string and everithing OK but the new URL returns a null string of JSON
}catch(Exception e){
e.printStackTrace();
}
return null;
}
String newurlexample = "http://111.22.333.44:1234/FOLD/blablabla";
String oldurl = "https:/example.com/FOLD/file.json";
我得到以下日志：
07-13 17:47:02.142: W/System.err(18824): org.json.JSONException: Value Method of type java.lang.String cannot be converted to JSONArray
07-13 17:47:02.145: W/System.err(18824): at org.json.JSON.typeMismatch(JSON.java:111)
07-13 17:47:02.145: W/System.err(18824): at org.json.JSONArray.<init>(JSONArray.java:96)
07-13 17:47:02.146: W/System.err(18824): at org.json.JSONArray.<init>(JSONArray.java:108)
07-13 17:47:02.146: W/System.err(18824): at com.karlol.***.Doctor_Fragment$GetData.doInBackground(Doctor_Fragment.java:171)
07-13 17:47:02.146: W/System.err(18824): at com.karlol.***.Doctor_Fragment$GetData.doInBackground(Doctor_Fragment.java:1)
07-13 17:47:02.147: W/System.err(18824): at android.os.AsyncTask$2.call(AsyncTask.java:288)
07-13 17:47:02.147: W/System.err(18824): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
07-13 17:47:02.147: W/System.err(18824): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
07-13 17:47:02.147: W/System.err(18824): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
答案 0 :(得分：2)
从你问题的标题我可以注意到你使用的URL和新的ip之间有什么问题。首先你需要确保你的新网络服务提供与旧网站相同的结果。 您可以尝试使用此方法检索数据：
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
HttpResponse responce = httpclient.execute(httppost);
HttpEntity httpEntity = responce.getEntity();
is = httpEntity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(
is));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
reponse = sb.toString();
return new JSONArray(reponse);
//With the oldURL I printed the JSON as a string and everithing OK but the new URL returns a null string of JSON
}catch(Exception e){
e.printStackTrace();
}
编辑：
如果您使用共享托管服务器..在同一IP上拥有多个网站并不罕见，只能通过网站名称（所谓的虚拟主机）进行区分。您所做的只适用于给定IP上有单个站点的情况。
编辑2
您需要使用RESTful插件（chrome或firefox）测试您的网络服务，即Advanced rest client
答案 1 :(得分：2)
在尝试使用此功能之前，我们遇到了同样的问题。改变你的尝试中的一个并抓住这个。希望能帮助到你。
FileCache filecache;
String result="";
HttpURLConnection conn = null;
String finalurl="http://111.22.333.44:1234/FOLD/blablabla";
filecache = new FileCache(context);
File f = filecache.getFile(finalurl);
try {
URL url = new URL(finalurl);
conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
conn.setInstanceFollowRedirects(true);
InputStream is = conn.getInputStream();
OutputStream os = new FileOutputStream(f);
Utils.CopyStream(is, os);
FileReader isr = new FileReader(f);
BufferedReader reader = new BufferedReader(isr);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
result = sb.toString();
is.close();
os.close();
conn.disconnect();
return new JSONArray(result);
}catch (Exception ex) {
Log.e("Error", ex+"can't access" + finalurl + result);
}
FileCache.java
import android.content.Context;
import java.io.File;
/**
* Created by cristiana214 on 1/26/2015.
*/
public class FileCache {
private File cacheDir;
public FileCache(Context context) {
// Find the dir to save cached images
if (android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED)) {
cacheDir = new File(context.getExternalCacheDir(),"folder/i");
} else
cacheDir = context.getCacheDir();
if (!cacheDir.exists())
cacheDir.mkdirs();
}
public File getFile(String url) {
String filename = String.valueOf(url.hashCode());
File f = new File(cacheDir, filename);
return f;
}
public void clear() {
File[] files = cacheDir.listFiles();
if (files == null)
return;
for (File f : files)
f.delete();
}
}
Utils.java
import java.io.InputStream;
import java.io.OutputStream;
/**
* Created by cristiana214 on 1/26/2015.
*/
public class Utils {
public static void CopyStream(InputStream is, OutputStream os){
final int buffer_size=1024*10;
try{
byte[] bytes=new byte[buffer_size];
for(;;){
int count=is.read(bytes, 0, buffer_size);
if(count==-1)
break;
os.write(bytes, 0, count);
}
}
catch(Exception ex){}
}
}
答案 2 :(得分：2)
根据您的错误代码
org.json.JSONException: Value Method of type java.lang.String cannot be converted to JSONArray
您正在尝试将String转换为JSONArray。 还有一个指向doInBackground任务的指针，第171行，所以你一定要检查这一行。 我猜问题就在于这些问题：
reponse = EntityUtils.toString(httpEntity);
return new JSONArray(reponse);
答案 3 :(得分：2)
如果这对某人有帮助，我必须将请求更改为GET而不是POST，并且此代码工作正常，但我无法处理POST请求。
try {
URL obj = new URL("http://anIPaddress/REST/Folder/Consult?Operation=AnOperation");
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
//con default method is GET
con.setRequestProperty("Accept", "application/json");
con.setRequestProperty("Content-Type", "application/json");
int responseCode = con.getResponseCode();
Log.v("Lolo", "\nSending 'GET' request to URL : " + con.getURL());
Log.v("Lolo", "RESPONSE CODE : " + responseCode);
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
return new JSONArray(response.toString());
}
非常感谢您的回答和帮助。
答案 4 :(得分：1)
在日志消息中选中此行：
W / System.err（18824）：org.json.JSONException：类型java.lang.String的值方法无法转换为JSONArray
您收到此异常，因为您收到的服务器响应未格式化为JSON格式。因此，当您尝试将响应字符串转换为JSONArray时，会抛出上述JSONException。
现在您的问题的解决方案是：您需要确保将响应格式化为正确的JSON格式。并在解析为JSON之前记录您的响应，通过它您可以检查响应是否正确。
希望这可以帮助你:) 感谢