我一直在查看我的代码并且无法找到为什么会发生这种情况（或者为什么它实际上并没有将结果从MySQL服务器返回它应该。 希望一双新鲜的眼睛会找到原因。
Jsonparser类
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
// function get json from url
// by making HTTP POST or GET method
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 + "\n");
}
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 " + e.toString());
}
// return JSON String
return jObj;
}
}
我活动中的内部课程
class GetUserDetails extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(LogIn.this);
pDialog.setMessage("Loading User details. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Getting product details in background thread
* */
protected String doInBackground(String... params) {
// Building Parameters
List<NameValuePair> param = new ArrayList<NameValuePair>();
param.add(new BasicNameValuePair("email", EMAIL));
param.add(new BasicNameValuePair("password", PASSWORD));
// getting product details by making HTTP request
// Note that product details url will use GET request
JSONObject jsonuser = jsonParser.makeHttpRequest(
url_user_detials, "GET", param);
// check your log for json response
Log.d("User Details", jsonuser.toString());
// json success tag
try {
int success = jsonuser.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully received product details
JSONArray productObj = jsonuser
.getJSONArray("product"); // JSON Array
// get first product object from JSON Array
JSONObject product = productObj.getJSONObject(0);
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putInt("USERID", (Integer) product.get("ProfileID"));
editor.commit();
Intent intent = new Intent(LogIn.this, MyLists.class);
LogIn.this.startActivity(intent);
finish();
}else{
// product with pid not found
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once got all details
pDialog.dismiss();
}
}
最后服务器上的PHP脚本与数据库交谈
<?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
$db = new DB_CONNECT();
// check for post data
if (isset($_GET['email'] && isset($_GET['password')) {
$email = $_GET['email'];
$password = $_GET['password'];
// get a product from products table
$result = mysql_query("SELECT * FROM profiles_profiles WHERE ProfileEmail = '$email' AND ProfilePassword = '$password'");
if (!empty($result)) {
// check for empty result
if (mysql_num_rows($result) > 0) {
$result = mysql_fetch_array($result);
$product = array();
$product["ProfileID"] = $result["ProfileID"];
// success
$response["success"] = 1;
// user node
$response["product"] = array();
array_push($response["product"], $product);
// echoing JSON response
echo json_encode($response);
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No user found";
// echo no users JSON
echo json_encode($response);
}
} else {
// no product found
$response["success"] = 0;
$response["message"] = "No user found";
// echo no users JSON
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
和我正在获得的实际错误的堆栈跟踪
08-18 18:43:55.573: E/JSON Parser(16008): Error parsing data org.json.JSONException: End of input at character 0 of
08-18 18:43:55.573: W/dalvikvm(16008): threadid=13: thread exiting with uncaught exception (group=0x41515450)
08-18 18:43:55.584: E/AndroidRuntime(16008): FATAL EXCEPTION: AsyncTask #1
08-18 18:43:55.584: E/AndroidRuntime(16008): java.lang.RuntimeException: An error occured while executing doInBackground()
08-18 18:43:55.584: E/AndroidRuntime(16008): at android.os.AsyncTask$3.done(AsyncTask.java:299)
08-18 18:43:55.584: E/AndroidRuntime(16008): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
08-18 18:43:55.584: E/AndroidRuntime(16008): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
08-18 18:43:55.584: E/AndroidRuntime(16008): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
08-18 18:43:55.584: E/AndroidRuntime(16008): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-18 18:43:55.584: E/AndroidRuntime(16008): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
08-18 18:43:55.584: E/AndroidRuntime(16008): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-18 18:43:55.584: E/AndroidRuntime(16008): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-18 18:43:55.584: E/AndroidRuntime(16008): at java.lang.Thread.run(Thread.java:856)
08-18 18:43:55.584: E/AndroidRuntime(16008): Caused by: java.lang.NullPointerException
08-18 18:43:55.584: E/AndroidRuntime(16008): at com.test.app.LogIn$GetUserDetails.doInBackground(LogIn.java:149)
08-18 18:43:55.584: E/AndroidRuntime(16008): at com.test.app.LogIn$GetUserDetails.doInBackground(LogIn.java:1)
08-18 18:43:55.584: E/AndroidRuntime(16008): at android.os.AsyncTask$2.call(AsyncTask.java:287)
08-18 18:43:55.584: E/AndroidRuntime(16008): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-18 18:43:55.584: E/AndroidRuntime(16008): ... 5 more
来自PHP的错误
PHP Parse error: syntax error, unexpected T_BOOLEAN_AND, expecting ',' or ')' in /home/sites/pmclient.co.uk/public_html/dadgapp/get_user_details.php on line 19
答案 0 :(得分：1)
$password = $_GET['password']
你的PHP代码中的行。