android socket编程实例
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android客户端通过socket与服务器进行通信可以分为以下几步:
应用程序与服务器通信可以采用两种模式:TCP可靠通信 和UDP不可靠通信。
(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();
在写代码的过程中一定要注意对socket 输入流 输出流的关闭
下面是一个简单的例子:
main.xml
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent">
- <TextView
- android:id="@+id/TextView"
- android:singleLine="false"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content" />
- <EditText android:hint="content"
- android:id="@+id/EditText01"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content">
- </EditText>
- <Button
- android:text="send"
- android:id="@+id/Button02"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content">
- </Button>
- </LinearLayout>
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:id="@+id/TextView" android:singleLine="false" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <EditText android:hint="content" android:id="@+id/EditText01" android:layout_width="fill_parent" android:layout_height="wrap_content"> </EditText> <Button android:text="send" android:id="@+id/Button02" android:layout_width="fill_parent" android:layout_height="wrap_content"> </Button> </LinearLayout>
下面是android客户端的源代码:
- package com.android.SocketDemo;
- import java.io.BufferedReader;
- import java.io.BufferedWriter;
- import java.io.IOException;
- import java.io.InputStreamReader;
- import java.io.OutputStreamWriter;
- import java.io.PrintWriter;
- import java.net.Socket;
- import android.app.Activity;
- import android.app.AlertDialog;
- import android.content.DialogInterface;
- import android.os.Bundle;
- import android.os.Handler;
- import android.os.Message;
- import android.view.View;
- import android.widget.Button;
- import android.widget.EditText;
- import android.widget.TextView;
- public class SocketDemo extends Activity implements Runnable {
- private TextView tv_msg = null;
- private EditText ed_msg = null;
- private Button btn_send = null;
- // private Button btn_login = null;
- private static final String HOST = "192.168.1.223";
- private static final int PORT = 9999;
- private Socket socket = null;
- private BufferedReader in = null;
- private PrintWriter out = null;
- private String content = "";
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- tv_msg = (TextView) findViewById(R.id.TextView);
- ed_msg = (EditText) findViewById(R.id.EditText01);
- // btn_login = (Button) findViewById(R.id.Button01);
- btn_send = (Button) findViewById(R.id.Button02);
- try {
- socket = new Socket(HOST, PORT);
- in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
- out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
- socket.getOutputStream())), true);
- } catch (IOException ex) {
- ex.printStackTrace();
- ShowDialog("login exception" + ex.getMessage());
- }
- btn_send.setOnClickListener(new Button.OnClickListener() {
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- String msg = ed_msg.getText().toString();
- if (socket.isConnected()) {
- if (!socket.isOutputShutdown()) {
- out.println(msg);
- }
- }
- }
- });
- new Thread(SocketDemo.this).start();
- }
- public void ShowDialog(String msg) {
- new AlertDialog.Builder(this).setTitle("notification").setMessage(msg)
- .setPositiveButton("ok", new DialogInterface.OnClickListener() {
- @Override
- public void onClick(DialogInterface dialog, int which) {
- // TODO Auto-generated method stub
- }
- }).show();
- }
- public void run() {
- try {
- while (true) {
- if (socket.isConnected()) {
- if (!socket.isInputShutdown()) {
- if ((content = in.readLine()) != null) {
- content += "\n";
- mHandler.sendMessage(mHandler.obtainMessage());
- } else {
- }
- }
- }
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- public Handler mHandler = new Handler() {
- public void handleMessage(Message msg) {
- super.handleMessage(msg);
- tv_msg.setText(tv_msg.getText().toString() + content);
- }
- };
- }
package com.android.SocketDemo;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.net.Socket;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class SocketDemo extends Activity implements Runnable { private TextView tv_msg = null; private EditText ed_msg = null; private Button btn_send = null;// private Button btn_login = null; private static final String HOST = "192.168.1.223"; private static final int PORT = 9999; private Socket socket = null; private BufferedReader in = null; private PrintWriter out = null; private String content = ""; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); tv_msg = (TextView) findViewById(R.id.TextView); ed_msg = (EditText) findViewById(R.id.EditText01);// btn_login = (Button) findViewById(R.id.Button01); btn_send = (Button) findViewById(R.id.Button02); try { socket = new Socket(HOST, PORT); in = new BufferedReader(new InputStreamReader(socket.getInputStream())); out = new PrintWriter(new BufferedWriter(new OutputStreamWriter( socket.getOutputStream())), true); } catch (IOException ex) { ex.printStackTrace(); ShowDialog("login exception" + ex.getMessage()); } btn_send.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub String msg = ed_msg.getText().toString(); if (socket.isConnected()) { if (!socket.isOutputShutdown()) { out.println(msg); } } } }); new Thread(SocketDemo.this).start(); } public void ShowDialog(String msg) { new AlertDialog.Builder(this).setTitle("notification").setMessage(msg) .setPositiveButton("ok", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub } }).show(); } public void run() { try { while (true) { if (socket.isConnected()) { if (!socket.isInputShutdown()) { if ((content = in.readLine()) != null) { content += "\n"; mHandler.sendMessage(mHandler.obtainMessage()); } else { } } } } } catch (Exception e) { e.printStackTrace(); } } public Handler mHandler = new Handler() { public void handleMessage(Message msg) { super.handleMessage(msg); tv_msg.setText(tv_msg.getText().toString() + content); } };}
下面是服务器端得java代码:
- import java.io.BufferedReader;
- import java.io.BufferedWriter;
- import java.io.IOException;
- import java.io.InputStreamReader;
- import java.io.OutputStreamWriter;
- import java.io.PrintWriter;
- import java.net.ServerSocket;
- import java.net.Socket;
- import java.util.ArrayList;
- import java.util.List;
- import java.util.concurrent.ExecutorService;
- import java.util.concurrent.Executors;
- public class Main {
- private static final int PORT = 9999;
- private List<Socket> mList = new ArrayList<Socket>();
- private ServerSocket server = null;
- private ExecutorService mExecutorService = null; //thread pool
- public static void main(String[] args) {
- new Main();
- }
- public Main() {
- try {
- server = new ServerSocket(PORT);
- mExecutorService = Executors.newCachedThreadPool(); //create a thread pool
- System.out.print("server start ...");
- Socket client = null;
- while(true) {
- client = server.accept();
- mList.add(client);
- mExecutorService.execute(new Service(client)); //start a new thread to handle the connection
- }
- }catch (Exception e) {
- e.printStackTrace();
- }
- }
- class Service implements Runnable {
- private Socket socket;
- private BufferedReader in = null;
- private String msg = "";
- public Service(Socket socket) {
- this.socket = socket;
- try {
- in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
- msg = "user" +this.socket.getInetAddress() + "come toal:"
- +mList.size();
- this.sendmsg();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- @Override
- public void run() {
- // TODO Auto-generated method stub
- try {
- while(true) {
- if((msg = in.readLine())!= null) {
- if(msg.equals("exit")) {
- System.out.println("ssssssss");
- mList.remove(socket);
- in.close();
- msg = "user:" + socket.getInetAddress()
- + "exit total:" + mList.size();
- socket.close();
- this.sendmsg();
- break;
- } else {
- msg = socket.getInetAddress() + ":" + msg;
- this.sendmsg();
- }
- }
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- public void sendmsg() {
- System.out.println(msg);
- int num =mList.size();
- for (int index = 0; index < num; index ++) {
- Socket mSocket = mList.get(index);
- PrintWriter pout = null;
- try {
- pout = new PrintWriter(new BufferedWriter(
- new OutputStreamWriter(mSocket.getOutputStream())),true);
- pout.println(msg);
- }catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- }
- }
import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;import java.util.ArrayList;import java.util.List;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class Main { private static final int PORT = 9999; private List<Socket> mList = new ArrayList<Socket>(); private ServerSocket server = null; private ExecutorService mExecutorService = null; //thread pool public static void main(String[] args) { new Main(); } public Main() { try { server = new ServerSocket(PORT); mExecutorService = Executors.newCachedThreadPool(); //create a thread pool System.out.print("server start ..."); Socket client = null; while(true) { client = server.accept(); mList.add(client); mExecutorService.execute(new Service(client)); //start a new thread to handle the connection } }catch (Exception e) { e.printStackTrace(); } } class Service implements Runnable { private Socket socket; private BufferedReader in = null; private String msg = ""; public Service(Socket socket) { this.socket = socket; try { in = new BufferedReader(new InputStreamReader(socket.getInputStream())); msg = "user" +this.socket.getInetAddress() + "come toal:" +mList.size(); this.sendmsg(); } catch (IOException e) { e.printStackTrace(); } } @Override public void run() { // TODO Auto-generated method stub try { while(true) { if((msg = in.readLine())!= null) { if(msg.equals("exit")) { System.out.println("ssssssss"); mList.remove(socket); in.close(); msg = "user:" + socket.getInetAddress() + "exit total:" + mList.size(); socket.close(); this.sendmsg(); break; } else { msg = socket.getInetAddress() + ":" + msg; this.sendmsg(); } } } } catch (Exception e) { e.printStackTrace(); } } public void sendmsg() { System.out.println(msg); int num =mList.size(); for (int index = 0; index < num; index ++) { Socket mSocket = mList.get(index); PrintWriter pout = null; try { pout = new PrintWriter(new BufferedWriter( new OutputStreamWriter(mSocket.getOutputStream())),true); pout.println(msg); }catch (IOException e) { e.printStackTrace(); } } } } }
注意在AndroidManifest.xml中加入对网络的访问权限
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
在写代码的过程中一定要注意对套接字和输入/输出流的关闭
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