我一直在用Json Parser得到错误。解析数据时出错org.json.JSONException：字符0处的输入结束。无法从网址获取任何数据。我允许该应用程序访问主要的互联网。有人可以帮我解决我的代码有什么问题吗？我已经使用JSONLint验证了我的url是一个有效的JSON。
网址示例
[
{
"tid": "352",
"title": "10+2 Rule",
"acronym": [],
"description": "<p>“United States Customs and Border Protection (CBP) has announced a new rule, known as the Importer Security Filing (ISF) or more commonly called 10+2; which requires cargo information, for security purposes, to be transmitted to the agency at least 48 hours before goods are loaded onto an ocean vessel for shipment into the U.S. 10+2 is pursuant to section 203 of the SAFE Port Act, and requires importers to provide 10 data elements to CBP, as well as 2 more data elements from the carrier. On January 26, 2010, 10+2 was officially effective and importers are required to comply. If compliance is not met, they can face fines up to $5,000 for each violation. The proposed rule was known to the trade as both the ‘Importer Security Filing proposal’ and the ‘10 + 2 proposal’. The name “10 + 2” is shorthand for the number of advance data elements CBP will collect.</p><p>The following 10 data elements are required from the importer:</p><ol><li>Manufacturer (or supplier) name and address</li><li>Seller (or owner) name and address</li><li>Buyer (or owner) name and address</li><li>Ship-to name and address</li><li>Container stuffing location</li><li>Consolidator (stuffer) name and address</li><li>Importer of record number/foreign trade zone applicant identification number</li><li>Consignee number(s)</li><li>Country of origin</li><li>Commodity Harmonized Tariff Schedule number</li></ol><p>From the carrier, 2 data elements are required:</p><ol><li>Vessel stow plan</li><li>Container status messages”</li></ol>",
"sources": [
{
"tid": "350"
}
]
},
{
"tid": "354",
"title": "24-Hour Rule",
"acronym": [],
"description": "<p><span>“An amendment to the U.S. Trade Act of 2002 requiring that sea carriers and Non-Vessel Operating Common Carriers (NVOCCs) provide U.S. Customs and Border Protection (CBP) with detailed descriptions of the contents of sea containers bound for the United States 24 hours before the container is loaded on board a vessel. The cargo information required is that which is reasonably necessary to enable high-risk shipments to be identified for purposes of ensuring cargo safety and security and preventing smuggling pursuant to the laws enforced and administered by CBP. This information must be detailed and be transmitted electronically through approved systems.” </span><a href=\"http://www.cbp.gov/xp/cgov/trade/trade_outreach/advance_info/\">Learn more</a><span>.</span></p>",
"sources": [
{
"tid": "350"
}
]
},
{
"tid": "356",
"title": "3rd Party Logistics",
"acronym": "3PL",
"description": "<p>\"<span>A company that provides logistics services to customers who outsource part of, or all of, their supply chain management functions (i.e. transportation, warehousing, freight forwarding, distribution, cross docking, packaging, etc.)\"</span></p>",
"sources": [
{
"tid": "350"
}
]
},
JsonParser
public class JsonParser{
static InputStream is = null;
static JSONArray jarray = null;
static String json = "";
public JSONArray getJSONFromUrl(String url1) {
StringBuilder builder = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url1);
try {
HttpResponse response = client.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) {
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
} else {
Log.e("==>", "Failed to download file");
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// try parse the string to a JSON object
try {
jarray = new JSONArray( builder.toString());
//System.out.println(""+jarray);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jarray;
}
}
Main Java
public class Glossary extends ListActivity {
private ProgressDialog pDialog;
// URL to get contacts JSON
private static String url1 = "https://192.250.28.153/rest/glossary-items";
// JSON Node names
private static final String TAG_TID = "tid";
private static final String TAG_TITLE = "title";
private static final String TAG_ACRONYM = "acronym";
private static final String TAG_DESCRIPTION = "description";
private static final String TAG_SOURCES = "sources";
// contacts JSONArray
JSONArray contacts = null;
// Hashmap for ListView
ArrayList<HashMap<String, String>> glossaryList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_glossary);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
System.out.println("*** My thread is now configured to allow connection");
}
glossaryList = new ArrayList<HashMap<String, String>>();
ListView lv = getListView();
// Calling async task to get json
new GetData().execute();
}
/**
* Async task class to get json by making HTTP call
*/
private class GetData extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(Glossary.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
String str = "JSON STRING";
JsonParser sh = new JsonParser();
// Making a request to url and getting response
JSONArray jsonStr = sh.getJSONFromUrl(url1);
if (jsonStr != null){
try{
// looping through All Contacts
for (int i = 0; i <= jsonStr.length(); i++) {
JSONObject c = jsonStr.getJSONObject(i);
String tid = c.getString(TAG_TID);
String title = c.getString(TAG_TITLE);
String acronym = c.getString(TAG_ACRONYM);
String description = c.getString(TAG_DESCRIPTION);
// tmp hashmap for single contact
HashMap<String, String> contact = new HashMap<String, String>();
// adding each child node to HashMap key => value
contact.put(TAG_TID, tid);
contact.put(TAG_TITLE, title);
contact.put(TAG_ACRONYM, acronym);
contact.put(TAG_DESCRIPTION, description);
// adding contact to contact list
glossaryList.add(contact);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("JsonParser", "Couldn't get any data from the url");
}
return null;
}
@Override
protected void onPostExecute (Void result){
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
Glossary.this, glossaryList,
R.layout.list_item, new String[]{TAG_TITLE}, new int[]{R.id.title});
setListAdapter(adapter);
}
}
}
以防万一这里也是我的android清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.wizzard.james.glossary"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<!-- Internet permission -->
<uses-permission android:name="android.permission.INTERNET" />
<application
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name="com.wizzard.james.glossary.Glossary" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- Single List Item Activity -->
<activity
android:label="Contact"
android:name="com.wizzard.james.glossary.SingleContactActivity" >
</activity>
</application>
</manifest>