我正在做httppost方法，以便向php发送3个参数。 3个参数用于mysql查询以检索特定记录。 但是，我的json.getInt（）指向null。有什么方法可以得到回音信息吗？
protected String doInBackground(String... args) {
// updating UI from Background Thread
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("item_ID", itemID));
params.add(new BasicNameValuePair("booking_StartDate", checkStartDate));
params.add(new BasicNameValuePair("booking_EndDate", checkEndDate));
JSONObject json = jParser.makeHttpRequest(url_checkAvaibility, "POST", params);
// Check for success tag
try {
int success = json.getInt(TAG_SUCCESS);
if(records == null){
success =0;
}
else
{
success =1;
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
<?php
/*
* Following code will get single product details
* A product is identified by product id (pid)
*/
// array for JSON response
$response = array();
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// check for post data
$item_ID = $_POST['item_ID'];
$bookingStartDate = $_POST['booking_StartDate'];
$bd2 = strtotime($bookingStartDate);
$bd3 = date('Y-m-d',$bd2);
$bookingEndDate = $_POST['booking_EndDate'];
$be2 = strtotime($bookingEndDate);
$be3 = date('Y-m-d',$be2);
// get a product from products table
$result = mysql_query("SELECT booking_ID,booking_Title FROM booking_record where booking_Status='Approved' and item_ID='$item_ID' and (booking_StartDate between '$bd3' and '$be3' or booking_EndDate between '$bd3' and '$be3')") or die(mysql_error());
if (!empty($result)) {
if (mysql_num_rows($result) != 0) {
$result = mysql_fetch_array($result);
// check for empty result
$record = array();
$record ["booking_ID"] = $result["booking_ID"];
$record ["booking_Title"] = $result["booking_Title"];
$response["records"] = array();
array_push($response["records"], $record);
$response["success"] = 1;
echo json_encode($response);
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No product found";
// echo no users JSON
echo json_encode($response);
}}else{
$response["success"] = 0;
$response["message"] = "Error";
}
?>
我在这一行得到空指针异常。
int success = json.getInt(TAG_SUCCESS);
JSON makeHttpRequest方法
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// check for request method
if(method == "POST"){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}else if(method == "GET"){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);
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, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
/*try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data "+json + e.toString());
}*/
// return JSON String
try {
return new JSONObject(json);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
logcat的
> 03-12 02:36:57.928: E/AndroidRuntime(12689): FATAL EXCEPTION:
> AsyncTask #1 03-12 02:36:57.928: E/AndroidRuntime(12689):
> java.lang.RuntimeException: An error occured while executing
> doInBackground() 03-12 02:36:57.928: E/AndroidRuntime(12689): at
> android.os.AsyncTask$3.done(AsyncTask.java:278) 03-12 02:36:57.928:
> E/AndroidRuntime(12689): at
> java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
> 03-12 02:36:57.928: E/AndroidRuntime(12689): at
> java.util.concurrent.FutureTask.setException(FutureTask.java:124)
> 03-12 02:36:57.928: E/AndroidRuntime(12689): at
> java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
> 03-12 02:36:57.928: E/AndroidRuntime(12689): at
> java.util.concurrent.FutureTask.run(FutureTask.java:137) 03-12
> 02:36:57.928: E/AndroidRuntime(12689): at
> android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208) 03-12
> 02:36:57.928: E/AndroidRuntime(12689): at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
> 03-12 02:36:57.928: E/AndroidRuntime(12689): at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
> 03-12 02:36:57.928: E/AndroidRuntime(12689): at
> java.lang.Thread.run(Thread.java:856) 03-12 02:36:57.928:
> E/AndroidRuntime(12689): Caused by: java.lang.NullPointerException
> 03-12 02:36:57.928: E/AndroidRuntime(12689): at
> com.example.mysqltesting.ShowAvaibility$GetProductDetails.doInBackground(ShowAvaibility.java:89)
> 03-12 02:36:57.928: E/AndroidRuntime(12689): at
> com.example.mysqltesting.ShowAvaibility$GetProductDetails.doInBackground(ShowAvaibility.java:1)
> 03-12 02:36:57.928: E/AndroidRuntime(12689): at
> android.os.AsyncTask$2.call(AsyncTask.java:264) 03-12 02:36:57.928:
> E/AndroidRuntime(12689): at
> java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
> 03-12 02:36:57.928: E/AndroidRuntime(12689): ... 5 more
这是我得到的最新logcat
03-12 03:54:28.956: D/JSON-OUTPUT(22405): <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><html><head><title>403 Forbidden</title></head><body><h1>Forbidden</h1><p>You don't have permission to access /checkAva.phpon this server.</p><hr><address>Apache/2.4.9 (Win64) PHP/5.5.12 Server at 192.168.1.132 Port 80</address></body></html>
03-12 03:54:28.961: E/JSON Parser(22405): Error parsing data <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><html><head><title>403 Forbidden</title></head><body><h1>Forbidden</h1><p>You don't have permission to access /checkAva.phpon this server.</p><hr><address>Apache/2.4.9 (Win64) PHP/5.5.12 Server at 192.168.1.132 Port 80</address></body></html>org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject
答案 0 :(得分：0)
以下是审核错误后需要执行的操作，
您需要编辑etc / apache2 / httpd.conf并确保您拥有require all granted，这将允许您网络上的任何人访问您所服务的文件夹注意：我在Mac上。
DocumentRoot "/Users/USER_NAME_HERE/FOLDER_YOU_SERVE_FROM/"
<Directory "/Users/USER_NAME_HERE/FOLDER_YOU_SERVE_FROM/">
#
# Possible values for the Options directive are "None", "All",
# or any combination of:
# Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
#
# Note that "MultiViews" must be named *explicitly* --- "Options All"
# doesn't give it to you.
#
# The Options directive is both complicated and important. Please see
# http://httpd.apache.org/docs/2.4/mod/core.html#options
# for more information.
#
Options FollowSymLinks Multiviews
MultiviewsMatch Any
#
# AllowOverride controls what directives may be placed in .htaccess files.
# It can be "All", "None", or any combination of the keywords:
# AllowOverride FileInfo AuthConfig Limit
#
AllowOverride All
#
# Controls who can get stuff from this server.
#
Require all granted
</Directory>