http 连接错误

您好，我正在尝试从下面给出的链接获取数据

 http://abovestress.com/app_stress/fetch_all_detail.php?task=fetchtimefromdateanduserid&track_date=2011-08-09&tracker_user_id=374

但我无法得到结果我的代码在这里

package com.JsonDemo;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class JsonDemoActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    ArrayList<String> fetchsosfromID = new ArrayList<String>();
    String result = "";
    InputStream is = null;

    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
    nameValuePairs.add(new BasicNameValuePair("track_date","2011-08-09"));
    nameValuePairs.add(new BasicNameValuePair("tracker_user_id",""+374));

    try {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(
                "http://abovestress.com/app_stress/fetch_all_detail.php?task=fetchtimefromdateanduserid&");
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        is = entity.getContent();
    } catch (Exception e) {
        Log.e("log_tag", "Error in http connection " + e.toString());
    }
    // convert response to string
    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        result = sb.toString();
        Log.v("log_tag", "Append String " + result);
    } catch (Exception e) {
        Log.e("log_tag", "Error converting result " + e.toString());
    }

    // parse json data
    try {
        JSONArray jArray = new JSONArray(result);
        for (int i = 0; i < jArray.length(); i++) {
            JSONObject json_data = jArray.getJSONObject(i);
            fetchsosfromID.add(json_data.getString("track_time"));
            Log.v("log_tag", "daily_data " + fetchsosfromID);
        }
    } catch (JSONException e) {
        Log.e("log_tag", "Error parsing data " + e.toString());
    }
}

}

错误是这样的

08-09 17:29:01.315: ERROR/log_tag(2291): Error in http connection java.net.UnknownHostException: abovestress.com
08-09 17:29:01.315: ERROR/log_tag(2291): Error converting result java.lang.NullPointerException
08-09 17:29:01.345: ERROR/log_tag(2291): Error parsing data org.json.JSONException: End of input at character 0 of 

显现

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.JsonDemo"
  android:versionCode="1"
  android:versionName="1.0">
<uses-sdk android:minSdkVersion="9" />

<application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".JsonDemoActivity"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <uses-permission android:name="android.permission.INTERNET"/>
</application>
</manifest>

你肯定已经添加了

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

在你的清单中，对吗？

Edit: Your <uses-permission>是在错误的地方。它应该看起来像这样：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.JsonDemo"
  android:versionCode="1"
  android:versionName="1.0">
<uses-sdk android:minSdkVersion="9" />

<uses-permission android:name="android.permission.INTERNET"/>
<application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".JsonDemoActivity"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>
</manifest>