我正在尝试根据用户提供的输入从服务器读取数据。我在尝试从服务器读取时收到套接字异常。请任何让我知道我在做什么错误。我试图从我的移动设备执行应用程序，服务器是本地主机。
我在asyncTask方法的以下行中遇到异常：
// Get the server response
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
以下是我的代码：
import android.app.ActionBar;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.graphics.Color;
import android.os.AsyncTask;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
public class MainActivity extends AppCompatActivity {
private static Toolbar toolbar;
private static EditText userName, password;
private int result, count;
TextView content;
private String enteredUserName, enteredPassword, value, text = "";
private ImageButton signUp, signIn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initializing and setting ToolBar and Hiding ActionBar
// ActionBar actionBar = getActionBar();
// actionBar.hide();
toolbar = (Toolbar) findViewById(R.id.appBar);
setSupportActionBar(toolbar);
toolbar.setTitleTextColor(Color.WHITE);
userName = (EditText) findViewById(R.id.editTextUserName);
password = (EditText) findViewById(R.id.editTextPassword);
signUp = (ImageButton) findViewById(R.id.buttonSignUp);
signIn = (ImageButton) findViewById(R.id.imageButtonLogin);
content = (TextView) findViewById(R.id.textViewContent);
//Getting the value of UserName and Password fields to check whether account has already been created
SQLiteDataBaseAdapter db = new SQLiteDataBaseAdapter(this);
db.getUserNamePassword();
count = db.getStatusRowCount();
if(count != 0) {
value = db.getStatusValue();
Log.d("iFocus", "The value of Value is " + value);
}
}
public void onClickLogin(View view) {
// get The User name and Password
enteredUserName = userName.getText().toString();
enteredPassword = password.getText().toString();
//check if user is admin
if(enteredUserName.contains("admin") && enteredPassword.contains("admin")){
Intent intent = new Intent(this, AdminActivity.class);
startActivity(intent);
finish();
return;
}
new StatusCheck().execute();
if (text.equals("1")){
return;
}
//Check if userName or Password is blank
if (enteredUserName.isEmpty() || enteredPassword.isEmpty()) {
Toast.makeText(this, " User Name or Password cannot be blank. Enter Valid User Name and Password \n \n If user does not exist, sign up and create an account", Toast.LENGTH_LONG).show();
return;
}
new PasswordCheck().execute();
}
public void onClickSignUp(View view){
if(count == 0) {
Intent intent = new Intent(this, SignUpActivity.class);
startActivity(intent);
return;
}
else {
Toast.makeText(this, "Account already exists, Please try logging in with the existing account credentials.", Toast.LENGTH_LONG).show();
return;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
我在以下异步任务方法中收到错误。在阅读服务器的响应时。
private class StatusCheck extends AsyncTask<String, Void, String>{
@Override
protected String doInBackground(String... params) {
// Create data variable for sent values to server
String data = null;
try {
data = URLEncoder.encode("enteredusername", "UTF-8")
+ "=" + URLEncoder.encode(enteredUserName, "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
BufferedReader reader=null;
System.setProperty("http.keepAlive", "false");
// Send data
try
{
// Defined URL where to send data
URL url = new URL("http://10.0.2.2/loginstatuscheck.php");
// Send POST data request
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write( data );
wr.flush();
// Get the server response
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
// Read Server Response
while((line = reader.readLine()) != null)
{
// Append server response in string
sb.append(line);
}
text = sb.toString();
}
catch(Exception ex) {
Log.e("iFocus", ""+ex);
}
try
{
}
finally
{
try
{
reader.close();
}
catch(Exception ex) {}
}
// Show response on activity
// content.setText( text );
Log.d("iFocus", "The value of the response is " + text);
return null;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Toast.makeText(getApplicationContext(), ""+text, Toast.LENGTH_LONG).show();
if (text.equals("1")){
Toast.makeText(getApplicationContext(), "The Account is still under Moderation. Account is not yet Active. Please try after some time", Toast.LENGTH_LONG).show();
signUp.setClickable(false);
signUp.setEnabled(false);
signIn.setEnabled(false);
signIn.setClickable(false);
return;
}
else {
Toast.makeText(getApplicationContext(), "The Account has been Activated Successfully", Toast.LENGTH_LONG).show();
signUp.setClickable(false);
signUp.setEnabled(false);
signIn.setEnabled(true);
signIn.setClickable(true);
}
}
}
private class PasswordCheck extends AsyncTask<String, Void, String>{
@Override
protected String doInBackground(String... params) {
// get The User name and Password
enteredUserName = userName.getText().toString();
enteredPassword = password.getText().toString();
// Create data variable for sent values to server
String data = null;
try {
data = URLEncoder.encode("enteredusername", "UTF-8")
+ "=" + URLEncoder.encode(enteredUserName, "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
BufferedReader reader=null;
System.setProperty("http.keepAlive", "false");
// Send data
try
{
// Defined URL where to send data
URL url = new URL("http://10.0.2.2/passwordretreive.php");
// Send POST data request
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write( data );
wr.flush();
// Get the server response
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
// Read Server Response
while((line = reader.readLine()) != null)
{
// Append server response in string
sb.append(line);
}
text = sb.toString();
}
catch(Exception ex) {
Log.e("iFocus", ""+ex);
}
try
{
}
finally
{
try
{
reader.close();
}
catch(Exception ex) {}
}
// Show response on activity
// content.setText( text );
Log.d("iFocus", "The value of the response is " + text);
return null;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
if (text.equals(enteredPassword)){
Toast.makeText(getApplicationContext(), "Congrats: Login Successful", Toast.LENGTH_SHORT).show();
//Calling the next screen after successful Login
Intent intent = new Intent(getApplicationContext(), MainScreen.class);
intent.putExtra("UserName", enteredUserName);
startActivity(intent);
finish();
} else {
//Displaying message for unsuccessful login attempt
Toast.makeText(getApplicationContext(), "User Name or Password does not match", Toast.LENGTH_LONG).show();
}
}
}
}
欢迎所有建议。提前致谢。请帮我解决这个问题。我很久很难挣扎。
答案 0 :(得分：1)
错误已解决。我曾说我试图从我的移动设备上测试它，所以我需要给我的电脑的网址，因为它不是模拟器，我不应该给10.0.2.2。更改URL并提供我的系统URL就可以了。希望它有所帮助。