android socket通讯

你这在主线程调用网络连接会报错的，不能在主线程操作，需要启动一个线程来操作，请求的方法
HttpPost request = new HttpPost(url);
            // 设置参数的编码
            request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));

            HttpParams httpParameters = new BasicHttpParams();
            //连接超时时间
            HttpConnectionParams.setConnectionTimeout(httpParameters, 30000);
            //读取连接超时时间
            HttpConnectionParams.setSoTimeout(httpParameters, 30000);

            // 发送请求并获取反馈
            HttpResponse httpResponse = new DefaultHttpClient(httpParameters).execute(request);
需要url和params携带的请求数据，如果没有就为null

太复杂了，能不能给个完整的代码段；
我只想通过MainActivity创建一个连到Server的socket，然后发个消息，并能接收服务器的返回消息，如果都在MainActivity内写是可以实现，只是想把Socket写成一个通用的类，可以在其它的类内也可以调用并接收返回数据；

建议使用Selector和SocketChannel，具体怎么用就请百度下，一两句话是说不清，还有就算你在MainActivity中调用这个Socket类，也需要在子线程中调用。

没有一个热心的大侠肯耐心解释一下吗？大家上CSDN都这么吝啬，以后都没有人肯来了；

其实我想说我也不懂，不过，如果要详细说的话，几页都说不完，首先android的sokect和java的一模一样，没啥特别的地方，除了一个地方，你要启动service进行长连接，如果不懂你真的可以百度下，网上很多详解

public static void sendSocketMsg(String ip,String msg) throws IOException
{
Socket socket = new Socket(ip,1992);//新建一个SOCKET以IP为地址，1992作为端口号
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));//新建一个writer放置在socket的发送端
writer.write(msg);//将msg信息发送出去
writer.flush();
writer.close();
socket.close();
}再要用的类里面实例化一下Senter msenter=new Senter();然后就可以msenter.sendSocketMsg(IP.ip, key);

给你个地址，去看看学学吧 http://www.marschen.com/portal.php

android客户端通过socket与服务器进行通信可以分为以下几步：
应用程序与服务器通信可以采用两种模式：TCP可靠通信和UDP不可靠通信。
（1）通过IP地址和端口实例化Socket，请求连接服务器：
     socket = new Socket(HOST, PORT);   //host:为服务器的IP地址  port：为服务器的端口号
（2）获取Socket流以进行读写，并把流包装进BufferWriter或者PrintWriter：
   PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);
   这里涉及了三个类：socket.getOutputStream得到socket的输出字节流，OutputStreamWriter是字节流向字符流转换的桥梁，BufferWriter是字符流，然后再包装进PrintWriter。
（3）对Socket进行读写
     if (socket.isConnected()) {
                    if (!socket.isOutputShutdown()) {
                        out.println(msg);
                    }
                }
（4）关闭打开的流
      out.close();
在写代码的过程中一定要注意对socket  输入流  输出流的关闭

下面是一个简单的例子：
main.xml
[html] view plaincopy
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView
        android:id="@+id/TextView"
        android:singleLine="false"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <EditText android:hint="content"
        android:id="@+id/EditText01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">
    </EditText>
    <Button
        android:text="send"
        android:id="@+id/Button02"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">
    </Button>
</LinearLayout>
下面是android客户端的源代码：
[java] view plaincopy
package com.android.SocketDemo;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class SocketDemo extends Activity implements Runnable {
    private TextView tv_msg = null;
    private EditText ed_msg = null;
    private Button btn_send = null;
//    private Button btn_login = null;
    private static final String HOST = "192.168.1.223";
    private static final int PORT = 9999;
    private Socket socket = null;
    private BufferedReader in = null;
    private PrintWriter out = null;
    private String content = "";

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        tv_msg = (TextView) findViewById(R.id.TextView);
        ed_msg = (EditText) findViewById(R.id.EditText01);
//        btn_login = (Button) findViewById(R.id.Button01);
        btn_send = (Button) findViewById(R.id.Button02);

        try {
            socket = new Socket(HOST, PORT);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
                    socket.getOutputStream())), true);
        } catch (IOException ex) {
            ex.printStackTrace();
            ShowDialog("login exception" + ex.getMessage());
        }
        btn_send.setOnClickListener(new Button.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String msg = ed_msg.getText().toString();
                if (socket.isConnected()) {
                    if (!socket.isOutputShutdown()) {
                        out.println(msg);
                    }
                }
            }
        });
        new Thread(SocketDemo.this).start();
    }

    public void ShowDialog(String msg) {
        new AlertDialog.Builder(this).setTitle("notification").setMessage(msg)
                .setPositiveButton("ok", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub

                    }
                }).show();
    }

    public void run() {
        try {
            while (true) {
                if (socket.isConnected()) {
                    if (!socket.isInputShutdown()) {
                        if ((content = in.readLine()) != null) {
                            content += "\n";
                            mHandler.sendMessage(mHandler.obtainMessage());
                        } else {

                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public Handler mHandler = new Handler() {
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            tv_msg.setText(tv_msg.getText().toString() + content);
        }
    };
}  下面是服务器端得java代码：
[java] view plaincopy
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;


public class Main {
    private static final int PORT = 9999;
    private List<Socket> mList = new ArrayList<Socket>();
    private ServerSocket server = null;
    private ExecutorService mExecutorService = null; //thread pool

    public static void main(String[] args) {
        new Main();
    }
    public Main() {
        try {
            server = new ServerSocket(PORT);
            mExecutorService = Executors.newCachedThreadPool();  //create a thread pool
            System.out.print("server start ...");
            Socket client = null;
            while(true) {
                client = server.accept();
                mList.add(client);
                mExecutorService.execute(new Service(client)); //start a new thread to handle the connection
            }
        }catch (Exception e) {
            e.printStackTrace();
        }
    }
    class Service implements Runnable {
            private Socket socket;
            private BufferedReader in = null;
            private String msg = "";

            public Service(Socket socket) {
                this.socket = socket;
                try {
                    in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                    msg = "user" +this.socket.getInetAddress() + "come toal:"
                        +mList.size();
                    this.sendmsg();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }

            @Override
            public void run() {
                // TODO Auto-generated method stub
                try {
                    while(true) {
                        if((msg = in.readLine())!= null) {
                            if(msg.equals("exit")) {
                                System.out.println("ssssssss");
                                mList.remove(socket);
                                in.close();
                                msg = "user:" + socket.getInetAddress()
                                    + "exit total:" + mList.size();
                                socket.close();
                                this.sendmsg();
                                break;
                            } else {
                                msg = socket.getInetAddress() + ":" + msg;
                                this.sendmsg();
                            }
                        }
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

           public void sendmsg() {
               System.out.println(msg);
               int num =mList.size();
               for (int index = 0; index < num; index ++) {
                   Socket mSocket = mList.get(index);
                   PrintWriter pout = null;
                   try {
                       pout = new PrintWriter(new BufferedWriter(
                               new OutputStreamWriter(mSocket.getOutputStream())),true);
                       pout.println(msg);
                   }catch (IOException e) {
                       e.printStackTrace();
                   }
               }
           }
        }
}  注意在AndroidManifest.xml中加入对网络的访问权限
<uses-permission android:name="android.permission.INTERNET"></uses-permission>

调试易

android socket通讯

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