【发布时间】：2015-06-27 18:41:33
【问题描述】：
我正在制作一个关于网上购物的安卓应用程序。
直到今天，我都能够使用我的 android 应用程序正确地获取数据并将数据插入数据库。 （从过去 15 天开始，该应用程序运行良好） 今天开始时它崩溃了，所以我检查了eclipse，我发现当我尝试向数据库发出http请求时，它显示访问被拒绝。
我不明白突然发生了什么......自从 4 天以来我没有更改任何代码，而且这个错误显示在所有尝试连接我的 sql 数据库的页面上......
还有一件事，当我尝试在浏览器中打开我的 php 文件时，它完美地显示了我想要的 json 字符串，这意味着正在访问数据库，那么为什么它在 android 中不起作用
我的代码如下。
MainActiity.java
package com.example.fashionapp;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.GridView;
import android.widget.ImageButton;
import android.widget.Toast;
public class MainActivity extends Activity
{
SessionManager s;
Context mycontext;
ImageButton banner,cat1,cat2,cat3,cat4;
JSONObject jsonobject;
JSONArray jsonarray;
ArrayList<HashMap<String, String>> arraylist;
MainViewAdapter adapter;
GridView gridmain;
private String URL_FEED = "http://realroom.byethost24.com/fashionapp/category.php";
static String CATEGORY_NAME = "cat_name";
static String PRODUCT_IMAGE = "cat_image";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
getWindow().setFlags(
WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
banner = (ImageButton) findViewById(R.id.banner);
gridmain = (GridView) findViewById(R.id.gridmain);
Intent intent = new Intent(this, MessageService.class);
startService(intent);
TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
String temp = telephonyManager.getDeviceId();
Log.e("imei", temp);
Toast.makeText(MainActivity.this, temp,Toast.LENGTH_SHORT).show();
mycontext=this;
s = new SessionManager(mycontext);
banner.setOnClickListener(new Button.OnClickListener()
{
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
Intent i = new Intent(MainActivity.this,Category.class);
i.putExtra("cat", "1");
startActivity(i);
}
});
if(isOnline())
{
new DownloadJSON().execute();
}
}
public boolean isOnline()
{
ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected())
{
return true;
}
else
{
return false;
}
}
private class DownloadJSON extends AsyncTask<Void, Void, Void>
{
@Override
protected void onPreExecute()
{
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... params)
{
List<NameValuePair> para = new ArrayList<NameValuePair>();
arraylist = new ArrayList<HashMap<String, String>>();
jsonobject = JSONfunctions.makeHttpRequest(URL_FEED, "POST", para);
Log.e("json",jsonobject.toString());
try
{
jsonarray = jsonobject.getJSONArray("categories");
for (int i = 0; i < jsonarray.length(); i++)
{
HashMap<String, String> map = new HashMap<String, String>();
jsonobject = jsonarray.getJSONObject(i);
// Retrive JSON Objects
map.put("cat_name", jsonobject.getString("category_name"));
map.put("cat_image", "http://realroom.byethost24.com/fashionapp/admin/fun/data/" + jsonobject.getString("category_img"));
// Set the JSON Objects into the array
arraylist.add(map);
}
}
catch (JSONException e)
{
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void args)
{
gridmain = (GridView) findViewById(R.id.gridmain);
adapter = new MainViewAdapter(MainActivity.this, arraylist);
gridmain.setAdapter(adapter);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
super.onCreateOptionsMenu(menu);
MenuInflater blowup = getMenuInflater();
blowup.inflate(R.menu.menuwithsearch, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
Intent i;
switch(item.getItemId())
{
case R.id.action_search:
break;
case R.id.currency:
i = new Intent(this, Currency.class);
startActivity(i);
break;
case R.id.checkout:
i = new Intent(this, CartActivity.class);
startActivity(i);
break;
case R.id.notifications:
i = new Intent(this, Notifications.class);
startActivity(i);
break;
case R.id.wish:
i = new Intent(this, WishActivity.class);
startActivity(i);
break;
case R.id.profile:
i = new Intent(this,CartActivity.class);
startActivity(i);
break;
case R.id.myorders:
i = new Intent(this, MyOrders.class);
startActivity(i);
break;
case R.id.logout:
s.logoutUser();
i = new Intent(this,LoginActivity.class);
// Closing all the Activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// Add new Flag to start new Activity
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
finish();
break;
case R.id.settings:
break;
}
return false;
}
}
JSONFunction.java
package com.example.fashionapp;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONfunctions
{
static InputStream is = null;
static String result = "";
static JSONObject jArray = null;
public static JSONObject getJSONfromURL(String url)
{
// Download JSON data from URL
try
{
Log.e("log_tag", "getjsonfromurl0");
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
Log.e("log_tag", "gethsonfromurl");
}
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.e("log_tag", "getjsonfromurl2");
}
catch (Exception e)
{
Log.e("log_tag", "Error converting result " + e.toString());
}
try
{
jArray = new JSONObject(result);
}
catch (JSONException e)
{
Log.e("log_tag", "Error parsing data " + e.toString());
}
return jArray;
}
public static JSONObject makeHttpRequest(String loginUrl, String post, List<NameValuePair> para)
{
try
{
if(post == "POST")
{
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(loginUrl);
httpPost.setEntity(new UrlEncodedFormEntity(para));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
Log.e("log_tag", "post");
}
else if(post == "GET")
{
HttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(para, "utf-8");
loginUrl += "?" + paramString;
HttpGet httpGet = new HttpGet(loginUrl);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}
}
catch (UnsupportedEncodingException e)
{
e.printStackTrace();
}
catch (ClientProtocolException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
try
{
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"), 8);
StringBuilder sb = new StringBuilder();
Log.e("log_tag", "1");
String line = null;
if (is != null)
{
while ((line = reader.readLine()) != null)
{
Log.e("line",line);
sb.append(line + "\n");
}
is.close();
result = sb.toString();
Log.e("log_tag", result);
}
}
catch (Exception e)
{
Log.e("Buffer Error", "Error converting result " + e.toString());
}
try
{
Log.e("log_tag", "posttry2");
jArray = new JSONObject(result);
Log.e("log_tag", "posttry3");
}
catch (JSONException e)
{
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
return jArray;
}
}
category.php
<?php
include('config.php');
date_default_timezone_set("Asia/Calcutta");
$result1 = mysqli_query($con,"SELECT category_name,category_img FROM categorytable");
$response = array();
$posts = array();
while($row=mysqli_fetch_array($result1))
{
$category_name =$row["category_name"];
$category_img =$row["category_img"];
$posts[] = array('category_name'=>$category_name, 'category_img'=> $category_img);
}
$response['categories'] = $posts;
print(json_encode($response));
?>
查看 php 输出： http://realroom.byethost24.com/fashionapp/category.php
日志输出
06-28 00:30:48.180: E/imei(650): 000000000000000
06-28 00:30:48.210: E/json(650): on
06-28 00:30:48.210: E/json(650): online
06-28 00:30:48.242: E/json(650): onli
06-28 00:30:48.661: E/json(650): online
06-28 00:30:48.870: D/gralloc_goldfish(650): Emulator without GPU emulation detected.
06-28 00:30:51.500: E/log_tag(650): post
06-28 00:30:51.531: E/log_tag(650): 1
06-28 00:30:51.542: E/line(650): 403 Access denied
06-28 00:30:51.551: E/log_tag(650): 403 Access denied
06-28 00:30:51.551: E/log_tag(650): posttry2
06-28 00:30:51.571: E/JSON Parser(650): Error parsing data org.json.JSONException: Value 403 of type java.lang.Integer cannot be converted to JSONObject
06-28 00:30:51.571: E/json(650): online
06-28 00:30:51.581: W/dalvikvm(650): threadid=11: thread exiting with uncaught exception (group=0x409961f8)
06-28 00:30:51.631: E/AndroidRuntime(650): FATAL EXCEPTION: AsyncTask #1
06-28 00:30:51.631: E/AndroidRuntime(650): java.lang.RuntimeException: An error occured while executing doInBackground()
06-28 00:30:51.631: E/AndroidRuntime(650): at android.os.AsyncTask$3.done(AsyncTask.java:278)
06-28 00:30:51.631: E/AndroidRuntime(650): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
06-28 00:30:51.631: E/AndroidRuntime(650): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
06-28 00:30:51.631: E/AndroidRuntime(650): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
06-28 00:30:51.631: E/AndroidRuntime(650): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
06-28 00:30:51.631: E/AndroidRuntime(650): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
06-28 00:30:51.631: E/AndroidRuntime(650): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
06-28 00:30:51.631: E/AndroidRuntime(650): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
06-28 00:30:51.631: E/AndroidRuntime(650): at java.lang.Thread.run(Thread.java:856)
06-28 00:30:51.631: E/AndroidRuntime(650): Caused by: java.lang.NullPointerException
06-28 00:30:51.631: E/AndroidRuntime(650): at com.example.fashionapp.MainActivity$DownloadJSON.doInBackground(MainActivity.java:229)
06-28 00:30:51.631: E/AndroidRuntime(650): at com.example.fashionapp.MainActivity$DownloadJSON.doInBackground(MainActivity.java:1)
06-28 00:30:51.631: E/AndroidRuntime(650): at android.os.AsyncTask$2.call(AsyncTask.java:264)
06-28 00:30:51.631: E/AndroidRuntime(650): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
06-28 00:30:51.631: E/AndroidRuntime(650): ... 5 more
请帮忙..
【问题讨论】：
-
在没有任何评论的情况下否决这个问题..:(
-
会不会和 CSRF 保护有关？看到这个帖子：stackoverflow.com/questions/24927731/…
-
403 access denied 是在服务器端生成的。也许服务器配置上的某些更改阻止了从程序而不是从浏览器中获取信息？你控制服务器端还是第三方？
-
它是第 3 方.. 问题解决了，我还没有包含 httpheader，并且我的服务器升级了，因此必须添加 header 否则它拒绝访问。
标签： java php android mysql json