特简单， 没有数据库， 还没有处理各种异常。
登录：输入用户名点击的登录即可。
发送消息： 特定格式->toUser:message
1. 服务器：保存在线用户
public class Online {
private static Online mOnline = null;
private LinkedHashMap<String, Socket> mOnlines = new LinkedHashMap<String, Socket>();
private Online() {
}
public synchronized static Online getInstance() {
if(null == mOnline) {
mOnline = new Online();
}
return mOnline;
}
public void put(String key, Socket socket) {
if(!mOnlines.containsKey(key)) {
mOnlines.put(key, socket);
}
}
public Socket get(String key) {
return mOnlines.get(key);
}
public void remove(String key) {
mOnlines.remove(key);
}
}
2. 服务器：一个简单的socket服务器
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
// login:uid
// send:fromuser:touser:message
// logout:uid
public class Server implements Runnable {
private Socket mSocket;
private Online mOnline;
public Server(Socket socket) {
mSocket = socket;
mOnline = Online.getInstance();
}
@Override
public void run() {
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
mSocket.getInputStream()));
String cmd = reader.readLine();
// login
if (cmd.startsWith("login")) {
String userName = cmd.split(":")[1];
mOnline.put(userName, mSocket);
System.out.println(userName + " login...");
PrintWriter writer = new PrintWriter(mSocket.getOutputStream());
writer.println("success");
writer.flush();
} else if (cmd.startsWith("send")) {
System.out.println(cmd);
String[] cmds = cmd.split(":");
String from = cmds[1];
Socket to = mOnline.get(cmds[2]);
String msg = cmds[3];
PrintWriter writer = new PrintWriter(to.getOutputStream());
System.out.println("rec:" + from + ":" + cmds[2] + ":" + msg);
writer.println("rec:" + from + ":" + cmds[2] + ":" + msg);
writer.flush();
}else if (cmd.startsWith("logout")) {
System.out.println(cmd);
String user = cmd.split(":")[1];
mOnline.get(user).close();
mOnline.remove(user);
PrintWriter writer = new PrintWriter(mSocket.getOutputStream());
writer.println("success");
writer.flush();
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws Exception {
ServerSocket server = new ServerSocket(8888);
boolean flag = true;
while (flag) {
new Thread(new Server(server.accept())).start();
System.out.println("user in...");
}
server.close();
}
}
3. 客户端登录界面
public class MainActivity extends Activity {
private EditText mUser;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mUser = (EditText) findViewById(R.id.username);
}
public void login(View view) {
final String userName = mUser.getText().toString().trim();
Login login = new Login(userName);
login.setOnLoginListener(new Login.LoginCallback() {
@Override
public void onLogin(boolean success) {
if(success) {
Intent intent = new Intent(MainActivity.this, Chat.class);
intent.putExtra("user", userName);
startActivity(intent);
finish();
}else {
Toast.makeText(MainActivity.this, "登录失败", Toast.LENGTH_SHORT).show();
}
}
});
login.login();
}
}
4. 处理登录
public class Login {
private String mUserName;
private LoginCallback mCallback;
public Login(String userName) {
mUserName = userName;
}
public void setOnLoginListener(LoginCallback callback) {
mCallback = callback;
}
private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case Constant.SUCCESS:
mCallback.onLogin(true);
break;
case Constant.FAILED:
mCallback.onLogin(false);
break;
}
};
};
public void login() {
new Thread(new Runnable() {
@Override
public void run() {
Socket socket = null;
try {
socket = new Socket();
socket.connect(new InetSocketAddress("192.168.100.100", 8888), 4000);
PrintWriter writer = new PrintWriter(socket.getOutputStream());
writer.println("login:" + mUserName);
writer.flush();
BufferedReader reader = new BufferedReader(
new InputStreamReader(socket.getInputStream()));
String line = reader.readLine();
System.out.println(line);
if("success".equals(line)) {
PConnection.socket = socket;
mHandler.sendEmptyMessage(Constant.SUCCESS);
}else {
mHandler.sendEmptyMessage(Constant.FAILED);
}
}catch(Exception e) {
e.printStackTrace();
}
}
}).start();
}
public interface LoginCallback {
public void onLogin(boolean success);
}
}
5. 聊天界面
public class Chat extends Activity {
private String mUserName;
private EditText mEdit;
private ListView mMessage;
private ReceiverMessage mRecMessage;
private SendMessage mSendMesage;
private List<Map<String, String>> mData = new ArrayList<Map<String, String>>();
private MessagesAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.chat_layout);
mUserName = getIntent().getStringExtra("user");
mEdit = (EditText) findViewById(R.id.edit);
mMessage = (ListView) findViewById(R.id.message);
mRecMessage = new ReceiverMessage();
mRecMessage.setOnReceiverListener(new RecListener());
mRecMessage.run();
mSendMesage = new SendMessage();
mSendMesage.setOnSendListener(new SendListener());
mAdapter = new MessagesAdapter(this, mData);
mMessage.setAdapter(mAdapter);
}
public void send(View view) {
String[] content = mEdit.getText().toString().trim().split(":");
mSendMesage.send(mUserName, content[0], content[1]);
}
private class RecListener implements ReceiverMessage.OnReceiverListener {
@Override
public void onReceiver(String user, String msg) {
Map<String, String> temp = new HashMap<String, String>();
temp.put("user", user);
temp.put("msg", msg);
temp.put("pos", "right");
mData.add(temp);
mAdapter.notifyDataSetChanged();
}
}
private class SendListener implements SendMessage.OnSendListener {
@Override
public void onSend(String[] msg) {
Map<String, String> temp = new HashMap<String, String>();
temp.put("user", "我");
temp.put("msg", msg[1]);
temp.put("pos", "left");
mData.add(temp);
mAdapter.notifyDataSetChanged();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(R.id.logout == item.getItemId()) {
Logout logout = new Logout();
logout.setOnLogoutListener(new Logout.OnLogoutListener() {
@Override
public void onLogout(boolean success) {
if(success) {
Toast.makeText(Chat.this, "注销成功", Toast.LENGTH_SHORT).show();
finish();
}else {
Toast.makeText(Chat.this, "注销失败", Toast.LENGTH_SHORT).show();
}
}
});
logout.logout(mUserName);
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
}
6. 发送消息
public class SendMessage {
private OnSendListener mListener;
public void setOnSendListener(OnSendListener listener) {
mListener = listener;
}
private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
mListener.onSend((String[]) msg.obj);
};
};
// send:from:to:message
public void send(final String from , final String to, final String msg) {
new Thread(new Runnable() {
@Override
public void run() {
Socket socket = null;
try {
socket = new Socket();
socket.connect(new InetSocketAddress("192.168.100.100", 8888), 4000);
PrintWriter writer = new PrintWriter(socket.getOutputStream());
writer.println("send:" + from + ":" + to + ":" + msg);
writer.flush();
Message message = mHandler.obtainMessage(
Constant.SUCCESS, new String[] {to, msg});
message.sendToTarget();
} catch(Exception e) {
} finally {
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}).start();
}
public interface OnSendListener {
public void onSend(String[] msg);
}
}
7. 接收消息，死循环，但阻塞，没啥问题
public class ReceiverMessage {
private OnReceiverListener mListener;
public void setOnReceiverListener(OnReceiverListener listener) {
mListener = listener;
}
private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
String[] cmds = (String[]) msg.obj;
mListener.onReceiver(cmds[0], cmds[1]);
};
};
public void run() {
new Thread(new Runnable() {
@Override
public void run() {
try {
Socket socket = PConnection.socket;
while(true) {
System.out.println("wait for message...");
BufferedReader reader = new BufferedReader(
new InputStreamReader(socket.getInputStream()));
String line = reader.readLine();
if(line.startsWith("rec")) {
//rec:fromuser:touser:message
String[] cmds = line.split(":");
System.out.println(cmds[0] + ":" + cmds[1] + ":" + cmds[2] + ":" + cmds[3]);
Message msg = mHandler.obtainMessage(Constant.SUCCESS, new String[] {cmds[1], cmds[3]});
msg.sendToTarget();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
}
public interface OnReceiverListener {
public void onReceiver(String user, String msg);
}
}
8. 注销登录
public class Logout {
public OnLogoutListener mListener;
public void setOnLogoutListener(OnLogoutListener listner) {
mListener = listner;
}
private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
if(Constant.SUCCESS == msg.what) {
mListener.onLogout(true);
}else {
mListener.onLogout(false);
}
};
};
public void logout(final String user) {
new Thread(new Runnable() {
@Override
public void run() {
try {
Socket socket = new Socket();
socket.connect(new InetSocketAddress("192.168.100.100", 8888), 4000);
PrintWriter writer = new PrintWriter(socket.getOutputStream());
writer.println("logout:" + user);
writer.flush();
BufferedReader reader = new BufferedReader(
new InputStreamReader(socket.getInputStream()));
if("success".equals(reader.readLine())) {
PConnection.socket = null;
mHandler.sendEmptyMessage(Constant.SUCCESS);
}else {
mHandler.sendEmptyMessage(Constant.FAILED);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
}
public interface OnLogoutListener {
public void onLogout(boolean success);
}
}
9. 存放登录后的socket，在发送消息和接收消息时使用该socket
public class PConnection {
public static Socket socket;
}
希望本文所述对大家学习有所帮助。
