我從編程中休息了幾年回來。今天我試圖從 android 訪問我的網路服務器，我有一些我當天回收的代碼。代碼曾經可以作業，但是，瞧，今天它有一個錯誤。有人可以幫我解決這個問題嗎？
這是我的主要課程：
public class login extends AppCompatActivity {
Button join;
TextView clientid;
EditText username, password;
_upload upload;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
upload = new _upload();
String android_id = Secure.getString(login.this.getContentResolver(),
Secure.ANDROID_ID);
join = findViewById(R.id.join);
clientid = findViewById(R.id.clientid);
clientid.setText(android_id);
username = findViewById(R.id.username);
password = findViewById(R.id.password);
join.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
login();
}});
}
public void login(){
String id = username.getText().toString();
if (id.isEmpty()) { username.setError("required");username.requestFocus();return; }
String pw = password.getText().toString();
String cid = clientid.getText().toString();
String[] params = new String[3];
params[1]="username::" id;
params[2]="password::" pw;
params[3]="cid::" cid;
new upload.send(login.this, "dump.php", params);
Toast.makeText(this, id " " pw " " cid, Toast.LENGTH_LONG).show();
}
}
我的錯誤就在這條線上 new upload.send(login.this, "dump.php", params);
error: cannot find symbol
new _upload.send(login.this, "dump.php", params);
^
symbol: class send
location: class _upload
這是我的第二堂課，曾經作業過的那堂課：
public class _upload extends AppCompatActivity {
HttpURLConnection conn = null;
String Return;
String homeurl = "removed";
String roomurl = "";
String param;
Context ctx;
String er;
public void location(Context context, String url, String params){
ctx = context;
roomurl = url;
try {
param = "lola=" URLEncoder.encode(params, "UTF-8");
new sendStatusChange_Server().execute("");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
public void send(Context context, String url, String params[]){
ctx = context;
roomurl = url;
int total = params.length;
int i = 0;
while(i<=total-1) {
if (i==0) {
try {
String[] keyval = params[0].split("::");
param = keyval[0] "=" URLEncoder.encode(keyval[1], "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
i ;
}
else{
try {
String[] keyval = params[i].split("::");
param = param "&" keyval[0] "=" URLEncoder.encode(keyval[1], "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
i ;
}
}
new sendStatusChange_Server().execute("");
}
public class sendStatusChange_Server extends AsyncTask<String, String, Void> {
protected Void doInBackground(String... params) {
try {
updateserver();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
if(er!=null){Toast.makeText(ctx, er, Toast.LENGTH_LONG).show();}
else{Toast.makeText(ctx, Return, Toast.LENGTH_LONG).show();}
}
}
private void updateserver() throws IOException {
URL url = new URL(homeurl roomurl);
try {
conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setFixedLengthStreamingMode(param.getBytes().length);
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
PrintWriter out = new PrintWriter(conn.getOutputStream());
out.print(param);
Log.d("SENT:", param " to " url.toString());
out.close();
String response = "";
Scanner inStream = new Scanner(conn.getInputStream());
while (inStream.hasNextLine())
response = (inStream.nextLine());
inStream.close();
Return = response;
} catch (MalformedURLException ex) {
} catch (IOException ex) {
er = ex.toString();
}
return;
}
}
代碼在舊程式上仍然運行良好，但我制作了一個新程式包并希望讓它滾動......為什么會發生這種情況？感謝您抽出寶貴時間！
uj5u.com熱心網友回復：
您有語法錯誤。利用
upload.send(...)
代替
new upload.send(...)
因為upload已經是你的類的一個實體。
您可能也應該使它_upload不擴展AppCompatActivity（只需洗掉extends AppCompatActivityfrom public class _upload extends AppCompatActivity）。
轉載請註明出處，本文鏈接：https://www.uj5u.com/caozuo/384572.html