我用了this example 将数据插入在线服务器的我的表中。可能这篇文章是重复的，但我无法 找出我的代码出了什么问题。我在这里看到了很多帖子并相应地修改了我的 但仍然错误。请帮助我。
inser.php
<?php
$response = array();
$connect = mysqli_connect(" "," "," "," ");
if(mysqli_connect_errno($connect))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
else
{
echo "success";
}
$Make = isset($_POST['Make']) ? $_POST['Make'] : '';
$Model = isset($_POST['Model']) ? $_POST['Model'] : '';
$RegNo=isset($_POST['RegNo']) ? $_POST['RegNo'] : '';
$Engine=isset($_POST['Engine']) ? $_POST['Engine']: '';
$Chasis=isset($_POST['Chasis']) ? $_POST['Chasis']: '';
$query = mysqli_query($connect, "insert into car (Make, Model,RegNo,Engine,Chasis) values
('$Make','$Model','$RegNo','$Engine','$Chasis') ");
//$query = mysqli_query($connect, "insert into car (Make, Model,RegNo,Engine,Chasis)
values('Maruthi' ,'Ma22','434','42343','32423') ");
// check if row inserted or not
if ($query) {
// successfully inserted into database
$response["success"] = 1;
$response["message"] = "Product successfully created.";
// echoing JSON response
echo json_encode($response);
} else {
// failed to insert row
$response["success"] = 0;
$response["message"] = "Oops! An error occurred.";
// echoing JSON response
echo json_encode($response);
}
mysqli_close($connect);
?>
MainActivity.java
import org.json.JSONArray;
import org.json.JSONException;
import com.example.cardetails.CustomHttpClient;
public class MainActivity extends Activity {
CustomHttpClient jsonParser = new CustomHttpClient();
private ProgressDialog pDialog;
String[] make1 = {"general motors","audi","ford","maruthi suzuki","toyota","travelz"};
public EditText chasis;
public EditText engno;
public EditText regno;
public EditText model;
public EditText textView;
public JSONObject json;
private static final String TAG_SUCCESS = "success";
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
model=(EditText)findViewById(R.id.model);
regno=(EditText)findViewById(R.id.Registerno);
engno=(EditText)findViewById(R.id.engine);
chasis=(EditText)findViewById(R.id.chasis);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_dropdown_item_1line,make1);
final AutoCompleteTextView textView= (AutoCompleteTextView)findViewById(R.id.ap);
textView.setThreshold(1);
textView.setAdapter(adapter);
Button save=(Button)findViewById(R.id.save);
Button cancel=(Button)findViewById(R.id.cancel);
save.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
new CreateNewProduct().execute();
}
});}
class CreateNewProduct extends AsyncTask<String, String, String> {
protected void onPreExecute() {
super.onPreExecute();
ProgressDialog pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Adding details..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
protected String doInBackground(String... args) {
String Make = textView.getText().toString();
String Model = model.getText().toString();
String RegNo= regno.getText().toString();
String Engine=engno.getText().toString();
String Chasis=chasis.getText().toString();
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("Make",Make ));
params.add(new BasicNameValuePair("Model",Model));
params.add(new BasicNameValuePair("RegNo",RegNo));
params.add(new BasicNameValuePair("Engine",Engine));
params.add(new BasicNameValuePair("Chasis",Chasis));
// getting JSON Object
// Note that create product url accepts POST method
int success=0;
JSONObject json = CustomHttpClient.makeHttpRequest( "http://***.com/DB/insert.php",
"POST", params);
Log.d("Create Response", json.toString());
// check for success tag
try {
success = json.getInt(TAG_SUCCESS);
} catch (JSONException e) {
e.printStackTrace();
success=0;
}
return ""+success;
}
protected void onPostExecute(String result) {
pDialog.dismiss();
if (Integer.parseInt(result) == 1) {
Intent i = new Intent(
MainActivity.this,CreateTripActivity.class);
startActivity(i);
finish();
} else {
//your task here
}
}
}
}
我的 logcat 是
03-24 03:51:16.124: D/(1451): HostConnection::get() New Host Connection established 0xb7569238,
03-24 03:51:16.374: W/EGL_emulation(1451): eglSurfaceAttrib not implemented
03-24 03:51:16.404: D/OpenGLRenderer(1451): Enabling debug mode 0
03-24 03:51:20.374: D/dalvikvm(1451): GC_FOR_ALLOC freed 112K, 6% free 3153K/3348K, paused 57ms,
03-24 03:51:20.494: D/dalvikvm(1451): GC_FOR_ALLOC freed 6K, 6% free 3202K/3404K, paused 112ms,
03-24 03:51:20.494: I/dalvikvm-heap(1451): Grow heap (frag case) to 3.810MB for 635812-byte
03-24 03:51:20.614: D/dalvikvm(1451): GC_FOR_ALLOC freed 2K, 6% free 3821K/4028K, paused 118ms,
03-24 03:51:20.834: W/EGL_emulation(1451): eglSurfaceAttrib not implemented
03-24 03:51:28.834: W/dalvikvm(1451): threadid=12: thread exiting with uncaught exception
(group=0xb3b08ba8)
03-24 03:51:28.874: E/AndroidRuntime(1451): FATAL EXCEPTION: AsyncTask #2
03-24 03:51:28.874: E/AndroidRuntime(1451): Process: com.example.cardetails, PID: 1451
03-24 03:51:28.874: E/AndroidRuntime(1451): java.lang.RuntimeException: An error occured while
executing doInBackground()
03-24 03:51:28.874: E/AndroidRuntime(1451): at android.os.AsyncTask$3.done(AsyncTask.java:300)
03-24 03:51:28.874: E/AndroidRuntime(1451): at
java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
03-24 03:51:28.874: E/AndroidRuntime(1451): at
java.util.concurrent.FutureTask.setException(FutureTask.java:222)
03-24 03:51:28.874: E/AndroidRuntime(1451): at
java.util.concurrent.FutureTask.run(FutureTask.java:242)
03-24 03:51:28.874: E/AndroidRuntime(1451): at
android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
03-24 03:51:28.874: E/AndroidRuntime(1451): at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
03-24 03:51:28.874: E/AndroidRuntime(1451): at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
03-24 03:51:28.874: E/AndroidRuntime(1451): at java.lang.Thread.run(Thread.java:841)
03-24 03:51:28.874: E/AndroidRuntime(1451): Caused by: java.lang.NullPointerException
03-24 03:51:28.874: E/AndroidRuntime(1451): at
com.example.cardetails.MainActivity$CreateNewProduct.doInBackground(MainActivity.java:73)
03-24 03:51:28.874: E/AndroidRuntime(1451): at
com.example.cardetails.MainActivity$CreateNewProduct.doInBackground(MainActivity.java:1)
03-24 03:51:28.874: E/AndroidRuntime(1451): at android.os.AsyncTask$2.call(AsyncTask.java:288)
03-24 03:51:28.874: E/AndroidRuntime(1451): at
java.util.concurrent.FutureTask.run(FutureTask.java:237)
03-24 03:51:28.874: E/AndroidRuntime(1451): ... 4 more
03-24 03:51:28.914: W/EGL_emulation(1451): eglSurfaceAttrib not implemented
03-24 03:51:30.634: I/Choreographer(1451): Skipped 31 frames! The application may be doing too
much work on its main thread.
03-24 03:51:31.814: I/Process(1451): Sending signal. PID: 1451 SIG: 9
编辑: CustomHttpClient.java
public class CustomHttpClient {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public CustomHttpClient() {
}
// function get json from url
// by making HTTP POST or GET mehtod
public static 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;
}
}
最佳答案
你需要改变
if(method == "POST"){
至
if(method.equals("POST")){
与 GET 类似
改变
else if(method == "GET"){
至
else if(method.equals("GET")){
比较字符串时需要使用.equals或.equlasIgnoreCase
编辑:
你得到的是一个字符串，因此不是一个 jsonobject
其次改变这个
protected void onPreExecute() {
super.onPreExecute();
ProgressDialog pDialog = new ProgressDialog(MainActivity.this);
至
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
关于java - 在android中使用mysql、json将数据插入在线服务器。，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22603935/