Android 通过Socket实现手机端向PC发送数据，并接受PC端返回的数据

Socket通信有两种方式，一种是基于TCP，另一种是基于UDP。本文是基于TCP的方式。废话不多说，直接上代码

手机端代码

package com.example.sockettest;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import android.support.v7.app.ActionBarActivity;
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;

public class MainActivity extends ActionBarActivity {

private static final String TAG = "MainActivity";
private EditText mEditText;
private Button mButton;
private String sendMesg;
private Socket socket;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mEditText = (EditText) this.findViewById(R.id.mEditText);
        mButton = (Button) this.findViewById(R.id.mButton);
        mButton.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
                sendMesg = mEditText.getText().toString();
new Thread(new Runnable() {

@Override
public void run() {
try {
                            socket = new Socket("192.168.70.46", 12574);

//向服务器发送数据
                            PrintWriter send = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"utf-8")));
                            send.println(sendMesg);
                            send.flush(); 

//接受服务端数据
                            BufferedReader recv = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                            String recvMsg = recv.readLine();
if (recvMsg != null) {
// mRecvText.setText(recvMsg);
                                Log.e(TAG,"返回的内容是:"+recvMsg);
                            } else {
// mRecvText.setText("Cannot receive data correctly.");
                            }

                            send.close();
                            recv.close();
                            socket.close();
                            } catch (Exception ex) {
                            ex.printStackTrace();
                            }
                    }                   

                }).start();             
            }   
        });
        }
}

PC端代码（java）

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;


public class TestMain implements Runnable{

public static void main(String[] args) {
          Thread myThread = new Thread(new TestMain());
          myThread.start();

    }

@Override
public void run() {
try {
@SuppressWarnings("resource")
                ServerSocket serverSocket = new ServerSocket(12574);
while (true) {
                    Socket client = serverSocket.accept();
                    System.out.println("accept");
try {
//接收客户端的数据
                        BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream(),"utf-8"));
                        String str = in.readLine();
                        System.out.println("read:" + str);

//返回数据给客户端
                        PrintWriter pout = new PrintWriter(new OutputStreamWriter(client.getOutputStream(), "utf-8"));
                        pout.println("返回数据给客户端 " + "123456");
                        System.out.println("after send in server");
                        pout.close();
                        in.close();
                    } catch (Exception e) {
                        System.out.println(e.getMessage());
                        e.printStackTrace();
                    } finally {
                        client.close();
                        System.out.println("close");
                    }
                }
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }

    }


}

最后需要注意的是要在AndroidManifest.xml中需要添加网络权限