我开发了一个通过 facebook url 从 json 获取数据的应用程序： https ://www.facebook.com/feeds/page.php?id=105310924507&format=json
问题是有时它会成功获取数据而没有任何问题，有时它会显示我们的错误信息：不幸的是，应用程序已停止！
我不是什么问题，我尝试了很多
这是我的代码：
json配置
package com.engahmedphp.facebookcollector;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
// ==============================================================================
public JSONObject getJSONFromUrl(String url) {
// Making HTTP request
// try {
// defaultHttpClient
// DefaultHttpClient httpClient = new DefaultHttpClient();
//// HttpFeed httpFeed = new HttpFeed(url);
//
// HttpGet httpGet = new HttpGet(url);
//
// HttpResponse httpResponse = httpClient.execute(httpGet);
// HttpEntity httpEntity = httpResponse.getEntity();
// is = httpEntity.getContent();
HttpClient httpClient = new DefaultHttpClient();
// HttpFeed httpFeed = new HttpFeed(url);
HttpUriRequest httpGet = new HttpGet(url);
HttpResponse httpResponse = null;
try {
httpResponse = httpClient.execute(httpGet);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
HttpEntity httpEntity = httpResponse.getEntity();
// BufferedReader reader = new BufferedReader(new InputStreamReader(
// is, "UTF-8"), 8);
// StringBuilder sb = new StringBuilder();
// String line = null;
// while ((line = reader.readLine()) != null) {
// sb.append(line + "\n");
// }
// is.close();
json = EntityUtils.toString(httpEntity);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
获取数据的方法
public void getNewFeeds() {
String url = "https://www.facebook.com/feeds/page.php?id=" + fpageid
+ "&format=json";
try {
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(url);
// Getting Array of Contacts
entries = json.getJSONArray("entries");
// looping through All Contacts
for (int i = entries.length() - 1; i >= 0; i--) {
JSONObject e = entries.getJSONObject(i);
if (!dbPages.checkFeed(e.getString("id"))) {
// Storing each json item in variable
String fid = e.getString("id");
String title = Html.fromHtml(e.getString("title"))
.toString();
String content = e
.getString("content")
.replaceAll(
"<img[^>]*?src\\s*=\\s*['\"]([^'\"]*?)['\"][^>]*?/?>",
"").toString();
// String content = e.getString("content").toString();
//
// Document doc = Jsoup.parse(content);
// Element imgs = doc.select("img").first();
// imgs.outerHtml();
//
// String src = img.attr("src");
Pattern p = Pattern
.compile("<img[^>]*?src\\s*=\\s*['\"]([^'\"]*?)['\"][^>]*?/?>");
Matcher m = p.matcher(e.getString("content"));
String img = "";
if (m.find()) {
img = m.group(0);
}
dbPages.addFeed(fid, fpageid, title, content, img);
}
}
feedsCount = entries.length();
} catch (JSONException e) {
e.printStackTrace();
}
}
黄色的logcat
09-25 08:19:08.859: W/System.err(19351): org.apache.http.conn.HttpHostConnectException: Connection to https://www.facebook.com refused
09-25 08:19:08.874: W/System.err(19351): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
09-25 08:19:08.874: W/System.err(19351): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
09-25 08:19:08.874: W/System.err(19351): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
09-25 08:19:08.874: W/System.err(19351): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
09-25 08:19:08.882: W/System.err(19351): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
09-25 08:19:08.882: W/System.err(19351): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
09-25 08:19:08.882: W/System.err(19351): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
09-25 08:19:08.882: W/System.err(19351): at com.engahmedphp.facebookcollector.JSONParser.getJSONFromUrl(JSONParser.java:57)
09-25 08:19:08.890: W/System.err(19351): at com.engahmedphp.facebookcollector.GetFeedsService.getNewFeeds(GetFeedsService.java:217)
09-25 08:19:08.890: W/System.err(19351): at com.engahmedphp.facebookcollector.GetFeedsService.onHandleIntent(GetFeedsService.java:96)
09-25 08:19:08.890: W/System.err(19351): at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
09-25 08:19:08.890: W/System.err(19351): at android.os.Handler.dispatchMessage(Handler.java:99)
09-25 08:19:08.890: W/System.err(19351): at android.os.Looper.loop(Looper.java:137)
09-25 08:19:08.898: W/System.err(19351): at android.os.HandlerThread.run(HandlerThread.java:60)
09-25 08:19:08.898: W/System.err(19351): Caused by: java.net.ConnectException: failed to connect to /31.13.86.16 (port 443): connect failed: ETIMEDOUT (Connection timed out)
09-25 08:19:08.906: W/System.err(19351): at libcore.io.IoBridge.connect(IoBridge.java:114)
09-25 08:19:08.906: W/System.err(19351): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
09-25 08:19:08.906: W/System.err(19351): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
09-25 08:19:08.906: W/System.err(19351): at java.net.Socket.connect(Socket.java:842)
红色的logcat
09-25 08:19:08.937: E/SQLiteDatabase(19351): close() was never explicitly called on database '/data/data/com.engahmedphp.facebook/databases/facebook'
09-25 08:19:08.937: E/SQLiteDatabase(19351): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
09-25 08:19:08.937: E/SQLiteDatabase(19351): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:2063)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1117)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1074)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1161)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:826)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:228)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:157)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at com.engahmedphp.facebook.DAOPages.open(DAOPages.java:57)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at com.engahmedphp.facebook.GetFeedsService.onStartCommand(GetFeedsService.java:200)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2373)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at android.app.ActivityThread.access$1900(ActivityThread.java:128)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1224)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at android.os.Handler.dispatchMessage(Handler.java:99)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at android.os.Looper.loop(Looper.java:137)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at android.app.ActivityThread.main(ActivityThread.java:4514)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at java.lang.reflect.Method.invokeNative(Native Method)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at java.lang.reflect.Method.invoke(Method.java:511)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
09-25 08:19:08.937: E/SQLiteDatabase(19351): at dalvik.system.NativeStart.main(Native Method)
09-25 08:19:08.937: E/AndroidRuntime(19351): FATAL EXCEPTION: IntentService[getFeedsService]
09-25 08:19:08.937: E/AndroidRuntime(19351): java.lang.NullPointerException
09-25 08:19:08.937: E/AndroidRuntime(19351): at com.engahmedphp.facebook.JSONParser.getJSONFromUrl(JSONParser.java:70)
09-25 08:19:08.937: E/AndroidRuntime(19351): at com.engahmedphp.facebook.GetFeedsService.getNewFeeds(GetFeedsService.java:217)
09-25 08:19:08.937: E/AndroidRuntime(19351): at com.engahmedphp.facebook.GetFeedsService.onHandleIntent(GetFeedsService.java:96)
09-25 08:19:08.937: E/AndroidRuntime(19351): at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
09-25 08:19:08.937: E/AndroidRuntime(19351): at android.os.Handler.dispatchMessage(Handler.java:99)
09-25 08:19:08.937: E/AndroidRuntime(19351): at android.os.Looper.loop(Looper.java:137)
09-25 08:19:08.937: E/AndroidRuntime(19351): at android.os.HandlerThread.run(HandlerThread.java:60)
提前致谢