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android与pc 用socket无线通信

news 文章来源：https://blog.csdn.net/zdm198255/article/details/141163347 2024/9/21 12:46:23

今天做一个android与pc通信的小demo（不是wifi，蓝牙）android为客户端，pc为服务器（一对多）。pc代码很简单，android客户端代码也不难，但是有一点不太明白就是在客户端向服务器发送消息时要用

writer= new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);

用writer = new PrintWriter(socket.getOutputStream(), true)这句服务器接收不到消息！

（BufferedWriter主要提供了字符输出的缓冲功能，‌提高了字符输出的效率。

OutputStreamWriter则是一个字符输出流到字节输出流的桥梁，‌负责字符编码的转换。‌主要作用是将字符编码转换为字节编码，‌以便能够输出到各种设备或文件中。

OutputStream，‌是更底层的字节输出流，‌不涉及字符编码的转换）

先记录一下，以备后用！

以下代码为自己实验备份可以用（测试过的）但很不严谨

public class MainActivity extends Activity implements OnClickListener {
   public TextView textView;
public Socket socket;
public PrintWriter writer;
private Button btn;
private EditText editText;
public static final int UPDATE_TEXT=1;

@Override
protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.text_view);
btn=(Button)findViewById(R.id.button);
editText=(EditText)findViewById(R.id.edit_text);
btn.setOnClickListener(this);
//new ConnectTask().execute();
new Thread(new Runnable() {
   //PrintWriter out;
@Override
public void run() {
try {
socket = new Socket("192.168.1.3", 1982);
Log.d("MainActivity", "网络初始化成功");
writer= new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
// writer.println("wochaolezhangyuhui");
} catch (UnknownHostException e) {
e.printStackTrace();
Log.d("MainActivity", "未知主机地址");
} catch (IOException e) {
e.printStackTrace();
Log.d("MainActivity", "输入输出异常");
}
}

}).start();

}
       @Override
       public void onClick(View v) {
       // TODO Auto-generated method stub
       switch(v.getId()){
       case R.id.button:
           String str=editText.getText().toString();
           writer.println(str);
       }
   }

/*class ConnectTask extends AsyncTask<Void, Void, Void> {
private Socket socket;
PrintWriter out;
@Override
protected Void doInBackground(Void... params) {
try {
socket = new Socket("192.168.1.3", 1982); // 替换为PC的IP地址

//out= new PrintWriter(socket.getOutputStream());
out= new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out.write("wochaolezhangyuhui");
btn.setOnClickListener(new OnClickListener(){

               @Override
               public void onClick(View v) {
                   // TODO Auto-generated method stub
                   //String str=editText.getText();
       out.write("wochaolezhangyuhui");
               }});

//in.close();
out.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
return null;
   }
   }
   */
}

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