Socket实现pc端与手机Android端图片传输

socket编程的一般步骤：

1>创建Socket

2>打开连接到Socket的输入/出流

3>按照一定的协议对Socket进行读/写操作

4>关闭Socket

具体代码如下：

服务端（pc端）：

package com.text8;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;

public class Server {
//采用List来保存所客户端的信息
private static List<Socket> sockets=new ArrayList<Socket>();
public static void main(String [] args){
new Server().startServrer();
}
private void startServrer(){
ServerSocket ss=null;
try {
//与服务端建立连接，端口号10000
ss=new ServerSocket(9998);
while(true){
Socket s=ss.accept();
sockets.add(s);
new Server().new Start(s).start();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
class Start extends Thread{
Socket s=null;  //客户端
InputStream in=null;    //输入流，读

public Start(Socket s){
this.s=s;
}

public void run(){
try {
DataOutputStream dos = new DataOutputStream(s.getOutputStream());
System.out.println("success");
FileInputStream fis = new FileInputStream("F:/server/server.png");
System.out.println("client");
int size = fis.available();
byte[] data = new byte[size];
fis.read(data);
dos.writeInt(size);
dos.write(data);
dos.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {

s.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}
}

}

客户端（Android端）：

package com.example.fdt.client;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.Socket;

import android.app.Activity;
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 MainActivity extends Activity {

private ImageView imageView = null;
private Bitmap bmp = null;

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

imageView = (ImageView) findViewById(R.id.image01);
Button btn = (Button) findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {

Thread t = new Thread() {
@Override
public void run() {
super.run();
Socket s = null;
try {
s= new Socket("192.168.1.100", 9998);
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 out = new ByteArrayOutputStream();
bmp = BitmapFactory.decodeByteArray(data, 0,
data.length);
bmp.compress(CompressFormat.PNG, 100, out);
myHandler.obtainMessage().sendToTarget();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
};
t.start();
}
});
}

private Handler myHandler = new Handler(){
public void handleMessage(android.os.Message msg) {
imageView.setImageBitmap(bmp);
};
};

}