在Android

时间：2016-07-04 10:14:05

标签： java android json http networking

我目前正在使用可以访问在线游戏以获取我的帐户信息的应用。我需要使用JSON与服务器通信。我使用以下代码尝试与服务器通信，但没有来自服务器的响应。我也注意到httpclient和其他一些流行的类已被弃用，我找不到一些适当的教程来教我这个主题。任何帮助表示赞赏。

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="deardanielxd.travain2.MainActivity">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:text="Username : "
    android:id="@+id/Username_Lbl"
    android:layout_alignParentTop="true"
    android:layout_alignParentStart="true"
    android:editable="true"
    android:minHeight="20dp"
    android:layout_alignBottom="@+id/Username_Field"
    android:layout_toStartOf="@+id/Username_Field"
    android:layout_alignEnd="@+id/Password_Lbl" />

<EditText
    android:layout_width="wrap_content"
    android:layout_height = "40dp"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:id="@+id/Username_Field"
    android:editable="true"
    android:contextClickable="true"
    android:textIsSelectable="true"
    android:enabled="true"
    android:focusable="true"
    android:clickable="true"
    android:inputType="text"
    android:minHeight="40dp"
    android:layout_alignParentTop="true"
    android:layout_alignEnd="@+id/Load_Btn"
    android:layout_toEndOf="@+id/Password_Lbl" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:text="Password : "
    android:id="@+id/Password_Lbl"
    android:layout_below="@+id/Username_Lbl"
    android:layout_alignParentStart="true"
    android:minHeight="20dp"
    android:layout_alignBottom="@+id/Password_Field" />

<EditText
    android:layout_width="wrap_content"
    android:layout_height="40dp"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:id="@+id/Password_Field"
    android:password="true"
    android:editable="true"
    android:textIsSelectable="true"
    android:enabled="true"
    android:focusable="true"
    android:contextClickable="true"
    android:clickable="true"
    android:inputType="text"
    android:minHeight="40dp"
    android:layout_below="@+id/Username_Field"
    android:layout_alignParentEnd="true"
    android:layout_alignStart="@+id/Username_Field" />

<Button
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Load"
    android:id="@+id/Load_Btn"
    android:layout_alignParentEnd="true"
    android:layout_alignBottom="@+id/spinner"
    android:layout_below="@+id/Password_Field" />

<Spinner
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/spinner"
    android:spinnerMode="dropdown"
    android:layout_alignParentStart="true"
    android:layout_toStartOf="@+id/Load_Btn"
    android:layout_below="@+id/Password_Lbl" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/SysMsg"
    android:layout_alignParentStart="true"
    android:layout_alignParentBottom="true"
    android:layout_alignParentEnd="true"
    android:text="System : "
    android:textColor="#FF0000" />

<ScrollView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/scrollView"
    android:layout_below="@+id/spinner"
    android:layout_alignParentStart="true"
    android:layout_above="@+id/SysMsg"
    android:layout_alignParentEnd="true" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/OutPut"
        android:enabled="true" />
</ScrollView>

MainActivity.java 

package deardanielxd.travain2;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import org.json.JSONObject;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;


public class MainActivity extends AppCompatActivity {

    Spinner spinner;
    EditText Username, Password;
    Button Load_Btn;
    TextView Main_Output;
    TextView Sys_Output;
    String server = "";
    boolean debug = true;
    PlayerInfo curr = new PlayerInfo();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        SetupGadget();
        attachListener();

    }

    private void SetupGadget() {
        spinner = (Spinner) findViewById(R.id.spinner);
        Username = (EditText) findViewById(R.id.Username_Field);
        Password = (EditText) findViewById(R.id.Password_Field);
        Load_Btn = (Button) findViewById(R.id.Load_Btn);
        Main_Output = (TextView) findViewById(R.id.OutPut);
        Sys_Output = (TextView) findViewById(R.id.SysMsg);

        ArrayAdapter adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,Constants.Servers);
        spinner.setAdapter(adapter);
    }

    private void attachListener() {
        Load_Btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (debug) {
                    MainOutput( "Username : " + Username.getText());
                    MainOutput( "Password : " + Password.getText());
                    MainOutput( "Server : " + server);
                    MainOutput( "Internet Connection : " + (InternetAccess()?"Yes":"No"));
                    MainOutput( "" );
                }

                new test(MainActivity.this).execute();

            }
        });

        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                server = parent.getSelectedItem().toString();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });

    }

    private void SystemOutput(String output) {
        Sys_Output.setText("System : " + output);
    }

    public void MainOutput(String output) {
        Main_Output.append("\n" + output);
    }

    private boolean InternetAccess() {
        ConnectivityManager cm =
                (ConnectivityManager)this.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        return activeNetwork != null &&
                activeNetwork.isConnectedOrConnecting();

    }

    public class test extends AsyncTask<Void, Void, Void>

    {
        private MainActivity MA;

        test(MainActivity ma) {
            MA = ma;
        }

        @Override
        protected Void doInBackground(Void... n) {

            try {
                URL url = new URL("http://"+MA.server+"/api/external.php");
                HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

                urlConnection.setDoOutput(true);
                urlConnection.setRequestProperty("Content-Type","application/json");
                urlConnection.setRequestProperty("Host", "android.schoolportal.gr");
                urlConnection.setRequestMethod("POST");
                urlConnection.setUseCaches(false);
                urlConnection.connect();

                OutputStream printout = new DataOutputStream(urlConnection.getOutputStream ());
                printout.write(URLEncoder.encode(this.getObj().toString(),"UTF-8").getBytes());
                printout.flush ();
                printout.close ();

                try {
                    urlConnection.setRequestMethod("GET");
                    urlConnection.setDoInput(true);
                    InputStream in = new BufferedInputStream(urlConnection.getInputStream());
                    BufferedReader r = new BufferedReader(new InputStreamReader(in));
                    StringBuilder total = new StringBuilder(in.available());
                    String line;
                    while ((line = r.readLine()) != null) {
                        total.append(line).append('\n');
                    }
                    MA.MainOutput(total.toString());
                    MA.MainOutput("End of Doc");
                } finally {
                    urlConnection.disconnect();
                    return null;
                }
            } catch (java.net.MalformedURLException e) {

            } catch (java.io.IOException e) {

            };
            return null;

        }

        private JSONObject getObj() {

            JSONObject jobj = new JSONObject();
            try {
                jobj.put("email","funckybuggy@gmail.com");
                jobj.put("siteName","EasyTravian");
                jobj.put("sitUrl","testing.com");
                jobj.put("public",false);
            } catch (org.json.JSONException e) {

            }
            return jobj;

        }

    }

    public PlayerInfo getCurrentPlayerInfo() {
        return this.curr;
    }

    public void UpdateCurr() {
        this.curr.Username = this.Username.getText().toString();
        this.curr.Password = this.Password.getText().toString();
        this.curr.Server = this.server;
    }

    }

Constants.java 

public class Constants {
public static final String[] Servers = {
    "ts1.travian.hk",
    "ts2.travian.hk",
    "ts20.travian.hk",
    "tx3.travian.hk",
    "ts4.travian.hk",
    "ts19.travian.hk",
    "ts3.travian.hk",
    "ts6.travian.hk",
    "ts5.travian.hk"
};

}

2 个答案:

答案 0 :(得分：0)

你应该使用Volley Library。 这对Rest API来说非常好。

管理服务器调用很简单。

通过编译

添加库 
compile 'com.android.volley:volley:1.0.0'

然后制作一个Singleton类来处理所有的截击请求。

Volley提供了JsonArrayRequest和JsonObjectRequest，它们在网络调用期间非常有用。

这是凌空单身人士课程

public class MyApplication extends Application
{

    private RequestQueue mRequestQueue;
    private static MyApplication mInstance;

    @Override
    public void onCreate()
    {
        super.onCreate();
        mInstance = this;
    }

    public static synchronized MyApplication getInstance()
    {
        return mInstance;
    }

    public RequestQueue getReqQueue()
    {
        if (mRequestQueue == null)
        {
            mRequestQueue = Volley.newRequestQueue(getApplicationContext());
        }

        return mRequestQueue;
    }

    public <T> void addToReqQueue(Request<T> req, String tag)
    {

        getReqQueue().add(req);
    }

    public <T> void addToReqQueue(Request<T> req)
    {

        getReqQueue().add(req);
    }

    public void cancelPendingReq(Object tag)
    {
        if (mRequestQueue != null) {
            mRequestQueue.cancelAll(tag);
        }
    }
}

将其添加到清单

中的应用程序代码中 
<application
android:name="MyApplication">

这是一个示例JsonObjectRequest 

JsonObjectRequest request = new JsonObjectRequest("requestMethod","url","input_data",
                        new Response.Listener<JSONObject>()
                        {
                            @Override
                            public void onResponse(JSONObject response)
                            {
                            }
                        },
                        new Response.ErrorListener()
                        {
                            @Override
                            public void onErrorResponse(VolleyError error)
                            {
                            }
                        });
                MyApplication.getInstance().addToReqQueue(request);

答案 1 :(得分：0)

我认为你不应该对邮件正文进行编码。 之所以被称为＆＃34; URLEncoder＆＃34;是因为它用于编码URL，但这是你的消息正文。

此外，您拥有的内部尝试块是多余的，您还应该在请求中间将请求方法更改为GET。

没有必要刷新字节。

请记住，对于POST请求，在您使用InputStream读取响应之前不会发送任何内容。

相关问题
最新问题