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先上代码，可以先把代码下下来，对着代码看本文。代码地址是：，代码记得点击star哦~

  总有些想尝试一些底层的人，之前做过socket开发，总是想能不能用socket实现手机和服务器直接通信。尝试了下，还是不难的。毕竟都是用Java写的，无论是Android端还是服务器端，都是对Socket的使用。下面给出具体代码。

 先看服务器端代码：

Server.java

package com.scu;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;public class Server implements Runnable {	public void run() {		try {			// 创建ServerSocket			ServerSocket serverSocket = new ServerSocket(6868);			while (true) {				// 接受客户端请求				Socket client = serverSocket.accept();				if (client == null) {					continue;				}				System.out.println("客户端来了");				try {					// 接收客户端消息					BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));					String str = in.readLine();					System.out.println("收到：" + str);					// 向服务器发送消息					PrintWriter out = new PrintWriter(							new BufferedWriter(new OutputStreamWriter(client.getOutputStream())), true);					out.println("服务器收到了");					// 关闭流					out.close();					in.close();				} catch (Exception e) {					System.out.println(e.getMessage());					e.printStackTrace();				} finally {					// 关闭					client.close();					System.out.println("close");				}			}		} catch (Exception e) {			System.out.println(e.getMessage());		}	}	// main函数，开启服务器，这就是一个普通的Java类，可以放到命令行里面执行的	public static void main(String a[]) {		Thread desktopServerThread = new Thread(new Server());		desktopServerThread.start();	}}

  上面是普通的Java类，可以直接放到命令行里面编译然后执行（javac Server.java，然后java Server即可）。首先初始化一个ServerSocket，利用一个while循环，不断循环接收客户端请求。注意ServerSocket类的accept函数将会阻塞线程的运行，当没有客户端发来请求时，服务器将会停在accept方法处，直到有客户端发送请求。

  下面看看Android端代码：

package com.zqc.socketdemo;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.net.Socket;public class MainActivity extends Activity {    private final String DEBUG_TAG = "hty";    private TextView mTextView = null;    private EditText mEditText = null;    private Button mButton = null;    Socket socket = null;    /**     * Called when the activity is first created.     */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mButton = (Button) findViewById(R.id.Button01);        mTextView = (TextView) findViewById(R.id.TextView01);        mEditText = (EditText) findViewById(R.id.EditText01);        mButton.setOnClickListener(new OnClickListener() {            public void onClick(View v) {                new Thread(){                    @Override                    public void run() {                        String message = mEditText.getText().toString();                        try {                            //创建Socket                            socket = new Socket("10.18.73.62", 6868);//第一个参数是ip地址，第二个是端口号                            //向服务器发送消息                            PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);                            out.println(message);                            //接收来自服务器的消息                            BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));                            String msg = new String(in.readLine().getBytes(),"UTF-8");                            if (msg != null) {                                mTextView.setText(msg);                            } else {                                mTextView.setText("数据错误!");                            }                            //关闭流                            out.close();                            br.close();                        } catch (Exception e) {                            Log.e(DEBUG_TAG, e.toString());                        } finally {                            //关闭Socket                            try {                                if (socket != null) {                                    socket.close();                                }                            } catch (Exception e) {                            }                        }                    }                }.start();            }        });    }}

  具体代码可以参考github：