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andriod下java socket网络编程:java socket客户端服务端代码示例

 
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    发布时间:2014-4-2  


     java socket 套接字原理介绍 Socket(套接字)是一种通信机制,可以实现单机或跨网络进行通信,其创建需要明确的区分C(客户端)/S(服务器端),支持多个客户端连接到同一个服务器。有两种传输模式: 1)面...

java socket 套接字原理介绍

   Socket(套接字)是一种通信机制,可以实现单机或跨网络进行通信,其创建需要明确的区分C(客户端)/S(服务器端),支持多个客户端连接到同

一个服务器。有两种传输模式:

  1)面向连接的传输:基于TCP协议,可靠性高,但效率低;

  2)面向无连接的传输:基于UDP协议,可靠性低,但效率高;

     Android中,直接采用Socket通信应该是我们遇到的最低级的网络运用。尽管已经作了很大程度的抽象,但是纯粹的Socket通信,仍然给开发者留下很多

细节需要处理,尤其在服务器端,开发者需要处理多线程以及数据缓冲等的设计问题。相对而言,处于更高抽象层的HTTP等,已经对Socket通信中需要处理的

技术细节进行了很好的封装,开发者无须关心,因此,HTTP在网络开发中通常具有决定性的优势。

     Android在其核心库的java包中,提供了用于客户端的Socket class和用于服务器端的ServerSocket class,分别位于

$SOURCE/libcore/luni/src/main/java/java/net/Socket.java和$SOURCE/libcore/luni/src/main/java/java/net/ServerSocket.java文件中。

 android客户端通过socket与服务器进行通信可以分为以下几步

  (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();


android客户端和java服务端之间用socket来传输图片的代码示例

   andriod java socket服务端代码示例:

import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.IOException;  
import java.net.ServerSocket;
import java.net.Socket;
public class Server01 {
    public static void main(String[] args) {
        try {
            ServerSocket server = new ServerSocket(30000);
            Socket socket = server.accept();
            DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
            FileInputStream fis = new FileInputStream("C:/sunnyTest/picture/cat01.jpg");
            int size = fis.available();
            System.out.println("size = "+size);
            byte[] data = new byte[size];
            fis.read(data);
            dos.writeInt(size);
            dos.write(data);
            dos.flush();
            dos.close();
            fis.close();
            socket.close();
            server.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}


  andriod java socket客户端代码示例:

import com.login.R;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class TestActivity extends Activity {
    private ImageView imageView = null;
    private Bitmap bmp = null;
    private ImageView imageView02;
    private Bitmap bmp02;
    private Button button02;
    private String uploadFile="/mnt/sdcard/qt.png";
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.image);
        imageView = (ImageView) findViewById(R.id.image01);
        Button btn = (Button) findViewById(R.id.Button01);
        btn.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
Socket socket = null;
                try {
                    socket = new Socket("192.168.1.203", 30000);
                    DataInputStream dataInput = new DataInputStream(socket.getInputStream());
                    int size = dataInput.readInt();
                    byte[] data = new byte[size];
                    int len = 0;
                    while (len < size) {
                        len += dataInput.read(data, len, size - len);
                    }
                    ByteArrayOutputStream outPut = new ByteArrayOutputStream();
                    bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
                    bmp.compress(CompressFormat.PNG, 100, outPut);
                    imageView.setImageBitmap(bmp);
                    //Bitmap bitmap = BitmapFactory.decodeStream(dataInput);
                    //myHandler.obtainMessage().sendToTarget();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                finally {
                    try {
                        socket.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                    }
        });
 }
 }


从服务器向客户端传送文件示例代码2

   andriod java socket服务端代码

package sterning;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class ServerTest {
    int port = 8821;
    void start() {
        Socket s = null;
        try {
            ServerSocket ss = new ServerSocket(port);
            while (true) {
                // 选择进行传输的文件
                String filePath = "D:\\lib.rar";
                File fi = new File(filePath);
                System.out.println("文件长度:" + (int) fi.length());
                // public Socket accept() throws
                // IOException侦听并接受到此套接字的连接。此方法在进行连接之前一直阻塞。
                s = ss.accept();
                System.out.println("建立socket链接");
                DataInputStream dis = new DataInputStream(new BufferedInputStream(s.getInputStream()));
                dis.readByte();
                DataInputStream fis = new DataInputStream(new BufferedInputStream(new FileInputStream(filePath)));
                DataOutputStream ps = new DataOutputStream(s.getOutputStream());
                //将文件名及长度传给客户端。这里要真正适用所有平台,例如中文名的处理,还需要加工,具体可以参见Think In Java 4th里有现成的代
码。
                ps.writeUTF(fi.getName());
                ps.flush();
                ps.writeLong((long) fi.length());
                ps.flush();
                int bufferSize = 8192;
                byte[] buf = new byte[bufferSize];
                while (true) {
                    int read = 0;
                    if (fis != null) {
                        read = fis.read(buf);
                    }
                    if (read == -1) {
                        break;
                    }
                    ps.write(buf, 0, read);
                }
                ps.flush();
                // 注意关闭socket链接哦,不然客户端会等待server的数据过来,
                // 直到socket超时,导致数据不完整。              
                fis.close();
                s.close();              
                System.out.println("文件传输完成");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static void main(String arg[]) {
        new ServerTest().start();
    }
}

 andriod java socket 的Util辅助类

package sterning;
import java.net.*;
import java.io.*;
public class ClientSocket {
    private String ip;
    private int port;
    private Socket socket = null;
    DataOutputStream out = null;
    DataInputStream getMessageStream = null;
    public ClientSocket(String ip, int port) {
        this.ip = ip;
        this.port = port;
    }
    /**
     * 创建socket连接
     *
     * @throws Exception
     *             exception
     */
    public void CreateConnection() throws Exception {
        try {
            socket = new Socket(ip, port);
        } catch (Exception e) {
            e.printStackTrace();
            if (socket != null)
                socket.close();
            throw e;
        } finally {
        }
    }
    public void sendMessage(String sendMessage) throws Exception {
        try {
            out = new DataOutputStream(socket.getOutputStream());
            if (sendMessage.equals("Windows")) {
                out.writeByte(0x1);
                out.flush();
                return;
            }
            if (sendMessage.equals("Unix")) {
                out.writeByte(0x2);
                out.flush();
                return;
            }
            if (sendMessage.equals("Linux")) {
                out.writeByte(0x3);
                out.flush();
            } else {
                out.writeUTF(sendMessage);
                out.flush();
            }
        } catch (Exception e) {
            e.printStackTrace();
            if (out != null)
                out.close();
            throw e;
        } finally {
        }
    }
    public DataInputStream getMessageStream() throws Exception {
        try {
            getMessageStream = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
            return getMessageStream;
        } catch (Exception e) {
            e.printStackTrace();
            if (getMessageStream != null)
                getMessageStream.close();
            throw e;
        } finally {
        }
    }
    public void shutDownConnection() {
        try {
            if (out != null)
                out.close();
            if (getMessageStream != null)
                getMessageStream.close();
            if (socket != null)
                socket.close();
        } catch (Exception e) {
        }
    }
}


 andriod java socket客户端代码

package sterning;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
public class ClientTest {
    private ClientSocket cs = null;
    private String ip = "localhost";// 设置成服务器IP
    private int port = 8821;
    private String sendMessage = "Windwos";
    public ClientTest() {
        try {
            if (createConnection()) {
                sendMessage();
                getMessage();
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
    private boolean createConnection() {
        cs = new ClientSocket(ip, port);
        try {
            cs.CreateConnection();
            System.out.print("连接服务器成功!" + "\n");
            return true;
        } catch (Exception e) {
            System.out.print("连接服务器失败!" + "\n");
            return false;
        }
    }
    private void sendMessage() {
        if (cs == null)
            return;
        try {
            cs.sendMessage(sendMessage);
        } catch (Exception e) {
            System.out.print("发送消息失败!" + "\n");
        }
    }
    private void getMessage() {
        if (cs == null)
            return;
        DataInputStream inputStream = null;
        try {
            inputStream = cs.getMessageStream();
        } catch (Exception e) {
            System.out.print("接收消息缓存错误\n");
            return;
        }
        try {
            //本地保存路径,文件名会自动从服务器端继承而来。
            String savePath = "E:\\";
            int bufferSize = 8192;
            byte[] buf = new byte[bufferSize];
            int passedlen = 0;
            long len=0;
            savePath += inputStream.readUTF();
            DataOutputStream fileOut = new DataOutputStream(new BufferedOutputStream(new BufferedOutputStream(new FileOutputStream
(savePath))));
            len = inputStream.readLong();
            System.out.println("文件的长度为:" + len + "\n");
            System.out.println("开始接收文件!" + "\n");
            while (true) {
                int read = 0;
                if (inputStream != null) {
                    read = inputStream.read(buf);
                }
                passedlen += read;
                if (read == -1) {
                    break;
                }
                //下面进度条本为图形界面的prograssBar做的,这里如果是打文件,可能会重复打印出一些相同的百分比
                System.out.println("文件接收了" +  (passedlen * 100/ len) + "%\n");
                fileOut.write(buf, 0, read);
            }
            System.out.println("接收完成,文件存为" + savePath + "\n");
            fileOut.close();
        } catch (Exception e) {
            System.out.println("接收消息错误" + "\n");
            return;
        }
    }
    public static void main(String arg[])
   {
        new ClientTest();
    }
}



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