我正在创建一个需要在android和php mysql之间建立连接的登录活动。
我正在使用AsyncTask来使用json对象和Json数组，但问题是我得到一个错误消息：
02-07 09:26:07.150: E/JSON Parser(3768): Error parsing data org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject
02-07 09:26:07.150: E/JsonObject(3768): {"message":"No User found","success":0}
如果有人可以帮助我，我将不胜感激
JSONParser.java
package pack.coderzheaven;
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.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 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 mehtod
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
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 {
Log.w("INbUFFERED Reader", "before the buffered reader beguin");
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().substring(0, sb.toString().length() - 1);
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
Log.w("INbUFFERED Reader", "before the Parsing beguin");
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
AndroidPHPConnectionDemo.java
package pack.coderzheaven;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class AndroidPHPConnectionDemo extends Activity {
Button b;
EditText et, pass;
String Username, Password;
TextView tv;
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
List<NameValuePair> nameValuePairs;
String pid;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
// single person url
// ******************************************************************
// the localhost in the google android emulator = 10.0.2.2
// the localhost in the genymotion emulator = 10.0.3.2
// ******************************************************************
private static final String url_check_login = "http://10.0.3.2/check.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PERSON = "person";
private static final String TAG_PID = "pid";
private static final String TAG_NAME = "username";
private static final String TAG_pass = "password";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
b = (Button) findViewById(R.id.Button01);
et = (EditText) findViewById(R.id.username);
pass = (EditText) findViewById(R.id.password);
tv = (TextView) findViewById(R.id.tv);
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// Getting complete person details in background thread
new CheckLogin().execute();
}
});
}
/**
* Background Async Task to Get complete person details
* */
class CheckLogin extends AsyncTask<String, String, String> {
JSONArray productObj;
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(AndroidPHPConnectionDemo.this);
pDialog.setMessage("Loading person details. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Getting person details in background thread
* */
@Override
protected String doInBackground(String... arg0) {
// updating UI from Background Thread
// Check for success tag
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("pid", pid));
// getting person details by making HTTP request
// Note that person details url will use GET request
JSONObject json = jsonParser.makeHttpRequest(url_check_login,
"GET", params);
Log.e("JsonObject", json.toString());
// check your log for json response
// Log.d("Single person Details", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully received person details
productObj = json.getJSONArray(TAG_PERSON); // JSON Array
}
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
if (productObj != null) {
try {
// get first product object from JSON Array
JSONObject person = productObj.getJSONObject(0);
et.setText(person.getString(TAG_NAME));
pass.setText(person.getString(TAG_pass));
Log.e("success in login", "SUCCESS IN LOGIN");
} catch (Exception e) {
e.printStackTrace();
}
}
pDialog.dismiss();
}
}
}
check.php
<?php
require_once('db_config.php');
// array for JSON response
$response = array();
//$person = null;
//if(isset($_GET["Username"])and isset($_POST["Password"])){
if(isset($_GET['pid'])){
// $username = $_POST['Username'];
// $password = $_POST['Password'];
$pid = $_GET['pid'];
// $query_search = "select username, password from members where username = '".$username."' AND password = '".$password. "'";
$query_search = "select * from members where id = '".$pid."'";
$query_exec = mysql_query($query_search) or die(mysql_error());
if (mysql_num_rows($query_exec) > 0)
{
$result = mysql_fetch_array($query_exec);
$person = array();
$person["username"]=$result["user_name"];
$person["password"]=$result["password"];
// success
$response["success"] = 1;
// user node
$response["person"] = array();
array_push($response["person"], $person);
// echoing JSON response
echo json_encode($response);
}
else
{
// no user found
$response["success"] = 0;
$response["message"] = "No User found";
echo $response["person"];
// echo no users JSON
echo json_encode($response);
}
}
else
{
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) are missing";
// echoing JSON response
echo json_encode($response);
}
?>
最佳答案
如果您查看按钮的onclick方法
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// Getting complete person details in background thread
new CheckLogin().execute();
}
});
您没有声明任何pid，但是在异步任务中，您将pid作为参数传递。
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("pid", pid));
显然那是错误的。更改为
List<NameValuePair> params = new ArrayList<NameValuePair>();如果您要检索所有数据。但是，如果要传递pid作为参数，则将其声明为
字符串pid =（TextView）view.findViewById（R.id.pid）.getText（）。toString（）;当且仅当您将pid定义为xml文件中的TextView时
关于php - Android与PHP和MySQL的连接如何解决错误？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/21624164/