android多线程访问服务器数据

android多线程访问服务器数据

使用多线程的方式访问网络资源。其中服务器能够读取到客户端发送的数据，同时把接受到的数据返回给客户端（也就是android）。android这边能够进行数据的发送和接受接受后能够把数据展现在界面上。这里需要注意的是，采用了Handler Message的方式进行。下面是服务器代码：

package com.xueyoucto.xueyou;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.BufferUnderflowException;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.List;

/**
 * Hello world!
 */
class ServerThread implements Runnable {
    private Socket s = null;
    BufferedReader br = null;
    OutputStream outputStream = null;

    public ServerThread(Socket s) throws IOException {
        this.s = s;
        br = new BufferedReader(new InputStreamReader(s.getInputStream(), "utf-8"));
        outputStream = s.getOutputStream();
    }

    public void run() {
        String content = null;
        while((content = readFromClient()) != null){
            System.out.println("服务器收到内容:" + content);
            try {
                outputStream.write((content + "\r\n").getBytes("utf-8"));
                System.out.println("服务器发送内容:" + content);
            } catch (IOException e) {
                e.printStackTrace();
                App.socketList.remove(s);
            }
        }
    }
    public String readFromClient(){
        try {
            return br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
            App.socketList.remove(s);
        }
        return null;
    }
}

public class App {
    private static final int SERVER_PORT = 61000;
    public static List socketList = new ArrayList();

    public static void main(String[] args) throws IOException {
        System.out.println("hello world");
        ServerSocket serverSocket = new ServerSocket(SERVER_PORT);
        while (true) {
            Socket s = serverSocket.accept();
            System.out.println("someone in...");
            socketList.add(s);
            new Thread(new ServerThread(s)).start();
        }
    }
}

运行结果：

android代码：

package com.example.wuxueyou.myfirstandroidapplication;

import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.example.wuxueyou.Utils.ClientThread;

public class MainActivity extends AppCompatActivity {
    private final String TAG = "MainActivity";
    private Button button;
    private TextView textview;
    private EditText editText;
    private Button buttonSend;
    private Handler handler;
    private ClientThread clientThread;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) this.findViewById(R.id.button);
        buttonSend = (Button) this.findViewById(R.id.button2);
        textview = (TextView) this.findViewById(R.id.textView2);
        editText = (EditText) this.findViewById(R.id.editText);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                System.out.println("--> this is sysout");
                Log.i(TAG, "==>this is Log out");
                Toast.makeText(MainActivity.this, "this is a Toast", Toast.LENGTH_SHORT).show();
            }
        });
        handler = new Handler(){
            @Override
            public void handleMessage(Message msg) {
                if(msg.what == 0x999){
                    textview.append(msg.obj.toString().trim() + "\n");
                }
            }
        };
        clientThread = new ClientThread(handler);
        new Thread(clientThread).start();
        buttonSend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Message msg = new Message();
                msg.what = 0x123;
                msg.obj = editText.getText().toString().trim();
                clientThread.SendHandler.sendMessage(msg);
                editText.setText("");
            }
        });

    }
}

package com.example.wuxueyou.Utils;

import android.os.Handler;
import android.os.Looper;
import android.os.Message;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;

/**
 * Created by wuxueyou on 16/9/12.
 */
public class ClientThread implements Runnable{
    public Handler SendHandler;
    private OutputStream outputStream = null;
    public  Handler recvHandler;
    private BufferedReader br = null;

    public ClientThread(Handler recvHandler) {
        this.recvHandler = recvHandler;
    }

    public void run(){
        try {
            Socket s = new Socket("192.168.0.109",61000);
            br = new BufferedReader(new InputStreamReader(s.getInputStream()));
            outputStream = s.getOutputStream();
        } catch (IOException e) {
            e.printStackTrace();
        }
        new Thread(){
            @Override
            public void run() {
                String content = null;
                try {
                    while((content = br.readLine())!= null){
                        Message msg = new Message();
                        msg.what = 0x999;
                        msg.obj =content;
                        recvHandler.sendMessage(msg);
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();
        Looper.prepare();
        SendHandler = new Handler(){
            @Override
            public void handleMessage(Message msg) {
                if(msg.what == 0x123){
                    try {
                        outputStream.write((msg.obj.toString().trim() + "\r\n").getBytes("utf-8"));
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        };
        Looper.loop();
    }
}

运行结果：

此时服务器端的输出：

值得注意的是，在使用OutputStream的时候，一定要在字符串后面加上“\r\n”，否则发送之后，服务器端接收不到。