Android登录界面-内容已被消耗

Question

大家好，我正在尝试执行下面的代码，这是我在一个教程中看到的，用于我的应用程序登录身份验证，但是我在执行它时遇到了以下错误，有人能帮我解决吗？我曾读过其他相关的帖子，但我要么找不到解决方案，要么我的编程技巧无法很好地解释和解决它。

我的逻辑猫：

01-29 01:26:26.997: I/System.out(2250): MessageContent has been consumed
01-29 01:26:26.997: W/System.err(2250): java.lang.IllegalStateException: Content has been consumed
01-29 01:26:26.997: W/System.err(2250):     at org.apache.http.entity.BasicHttpEntity.getContent(BasicHttpEntity.java:84)
01-29 01:26:27.007: W/System.err(2250):     at org.apache.http.conn.BasicManagedEntity.getContent(BasicManagedEntity.java:100)
01-29 01:26:27.007: W/System.err(2250):     at com.example.kibria.MainActivity.onClick(MainActivity.java:90)
01-29 01:26:27.007: W/System.err(2250):     at android.view.View.performClick(View.java:4438)
01-29 01:26:27.007: W/System.err(2250):     at android.view.View$PerformClick.run(View.java:18422)
01-29 01:26:27.007: W/System.err(2250):     at android.os.Handler.handleCallback(Handler.java:733)
01-29 01:26:27.007: W/System.err(2250):     at android.os.Handler.dispatchMessage(Handler.java:95)
01-29 01:26:27.007: W/System.err(2250):     at android.os.Looper.loop(Looper.java:136)
01-29 01:26:27.017: W/System.err(2250):     at android.app.ActivityThread.main(ActivityThread.java:5017)
01-29 01:26:27.017: W/System.err(2250):     at java.lang.reflect.Method.invokeNative(Native Method)
01-29 01:26:27.017: W/System.err(2250):     at java.lang.reflect.Method.invoke(Method.java:515)
01-29 01:26:27.017: W/System.err(2250):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
01-29 01:26:27.017: W/System.err(2250):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
01-29 01:26:27.017: W/System.err(2250):     at dalvik.system.NativeStart.main(Native Method

我的Java类：

    public class MainActivity extends ActionBarActivity implements OnClickListener {

        EditText etUser, etPass;
        Button bLogin;
        String username, password;
        HttpClient httpclient;
        HttpPost httppost;
        ArrayList<NameValuePair> nameValuePairs;
        HttpResponse response;
        HttpEntity entity;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().build();
            StrictMode.setThreadPolicy(policy);
            setContentView(R.layout.activity_main);
        etUser = (EditText) findViewById(R.id.etUser);
        etPass = (EditText) findViewById(R.id.etPass);
        bLogin = (Button) findViewById(R.id.bSubmit);

        bLogin.setOnClickListener(this);

        }

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            httpclient = new DefaultHttpClient();

            httppost = new HttpPost("http://10.0.2.2:8080/kibria/index.php");

            username = etUser.getText().toString();
            password = etPass.getText().toString();


            try{

                nameValuePairs = new ArrayList<NameValuePair>();

                nameValuePairs.add(new BasicNameValuePair("username", username));
                nameValuePairs.add(new BasicNameValuePair("password", password));



                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                response = httpclient.execute(httppost);

                if(response.getStatusLine().getStatusCode()==200){


                    entity = response.getEntity();


                    if(entity.getContent()!=null){


                        InputStream instream = response.getEntity().getContent();

                        JSONObject jsonResponse = new JSONObject(convertStreamToString(instream));


                        String retUser = jsonResponse.getString("user");
                        String retPass = jsonResponse.getString("pass");

                        if(username.equals(retUser)&& password.equals(retPass)){

                            SharedPreferences sp = getSharedPreferences("logindetails", 0);

                            SharedPreferences.Editor spedit = sp.edit();

                            spedit.putString("user", username);
                            spedit.putString("pass", password);

                            spedit.commit();

                            Toast.makeText(getBaseContext(), "SUCCESS!", Toast.LENGTH_SHORT).show();


                        }else {
                            Toast.makeText(getBaseContext(), "Invalid Login Details", Toast.LENGTH_SHORT).show();
                        }
                    }

            }
            }catch (Exception e){
                System.out.println("Message"+e.getMessage());
                e.printStackTrace();
                Toast.makeText(getBaseContext(), "Connection Error!!!", Toast.LENGTH_SHORT).show();
            }


        }

        private static String convertStreamToString(InputStream is) {
            BufferedReader reader = new BufferedReader(new InputStreamReader(is));

        StringBuilder sb = new StringBuilder();

        String line = null;
        try{
            while ((line = reader.readLine()) !=null){

                sb.append(line + "\n");
            }
        }   catch(IOException e){
            e.printStackTrace();
        }   finally {
            try{
                is.close();
            }catch (IOException e){

                e.printStackTrace();
            }
        }

    return sb.toString();


    }
}

我的PHP文件：

<?php
$dbhost = "localhost";
$dbuser = "root";
$dbpass = "";
$dbdb = "mobiledb";

$connect = mysqli_connect($dbhost, $dbuser, $dbpass)
or die("connection error");

mysqli_select_db($connect,$dbdb) or die ("database selection error");

$username = $_POST['username'];
$password = $_POST['password'];

$query = mysqli_query($connect, "SELECT * FROM androidlogin WHERE user = '$username'AND pass = '$password'");

$num = mysqli_num_rows($query);

if($num==1){

while($list=mysqli_fetch_assoc($query)){

$output = $list;
echo json_encode($output);
mysqli_close($connect);
}

}

更新的JAVA代码：

public void onClick(View v) {
        // TODO Auto-generated method stub



        httpclient = new DefaultHttpClient();

        httppost = new HttpPost("http://10.0.2.2:8080/kibria/index.php");

        username = etUser.getText().toString();
        password = etPass.getText().toString();


        try{

            nameValuePairs = new ArrayList<NameValuePair>();

            nameValuePairs.add(new BasicNameValuePair("username", username));
            nameValuePairs.add(new BasicNameValuePair("password", password));



            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            response = httpclient.execute(httppost);

            if(response.getStatusLine().getStatusCode()==200){


                //entity = response.getEntity();

                InputStream instream = response.getEntity().getContent();
                if(instream!=null){


                    //InputStream instream = response.getEntity().getContent();

                    JSONObject jsonResponse = new JSONObject(convertStreamToString(instream));


                    String retUser = jsonResponse.getString("user");
                    String retPass = jsonResponse.getString("pass");

                    if(username.equals(retUser)&& password.equals(retPass)){

                        SharedPreferences sp = getSharedPreferences("logindetails", 0);

                        SharedPreferences.Editor spedit = sp.edit();

                        spedit.putString("user", username);
                        spedit.putString("pass", password);

                        spedit.commit();


                        Toast.makeText(getBaseContext(), "SUCCESS!", Toast.LENGTH_SHORT).show();


                    }else {
                        //Toast().execute();
                        Toast.makeText(getBaseContext(), "Invalid Login Details", Toast.LENGTH_SHORT).show();
                    }

                }


        }

        }catch (Exception e){
            System.out.println("Message"+e.getMessage());
            e.printStackTrace();
            Toast.makeText(getBaseContext(), "Connection Error!!!", Toast.LENGTH_SHORT).show();
        }


    }

更新的LOGCAT：

01-29 02:47:39.722: I/System.out(2081): MessageEnd of input at character 0 of 
01-29 02:47:39.722: W/System.err(2081): org.json.JSONException: End of input at character 0 of 
01-29 02:47:39.732: W/System.err(2081):     at org.json.JSONTokener.syntaxError(JSONTokener.java:450)
01-29 02:47:39.732: W/System.err(2081):     at org.json.JSONTokener.nextValue(JSONTokener.java:97)
01-29 02:47:39.742: W/System.err(2081):     at org.json.JSONObject.<init>(JSONObject.java:155)
01-29 02:47:39.742: W/System.err(2081):     at org.json.JSONObject.<init>(JSONObject.java:172)
01-29 02:47:39.742: W/System.err(2081):     at com.example.kibria.MainActivity.onClick(MainActivity.java:99)
01-29 02:47:39.742: W/System.err(2081):     at android.view.View.performClick(View.java:4438)
01-29 02:47:39.742: W/System.err(2081):     at android.view.View$PerformClick.run(View.java:18422)
01-29 02:47:39.742: W/System.err(2081):     at android.os.Handler.handleCallback(Handler.java:733)
01-29 02:47:39.742: W/System.err(2081):     at android.os.Handler.dispatchMessage(Handler.java:95)
01-29 02:47:39.752: W/System.err(2081):     at android.os.Looper.loop(Looper.java:136)
01-29 02:47:39.752: W/System.err(2081):     at android.app.ActivityThread.main(ActivityThread.java:5017)
01-29 02:47:39.752: W/System.err(2081):     at java.lang.reflect.Method.invokeNative(Native Method)
01-29 02:47:39.752: W/System.err(2081):     at java.lang.reflect.Method.invoke(Method.java:515)
01-29 02:47:39.752: W/System.err(2081):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
01-29 02:47:39.752: W/System.err(2081):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
01-29 02:47:39.752: W/System.err(2081):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

java.lang.IllegalStateException:内容已被消耗

因为您不止一次调用getContent()方法。

正如您所看到的，getContent ()：

如果此实体不可重复且流已在以前获得，则为IllegalStateException。

将其修正为：

InputStream instream = response.getEntity().getContent();
if(instream!=null){
  //... your code here
}

Answer 2

You need to take AsynkTask class for server work then it will work fine.