带有服务器到客户端消息传递的Android应用程序
我现在正在创建一个Android应用程序,它允许客户端到服务器的消息传递,但我正在寻找一种同时允许服务器到客户端消息传递的方法,这样客户端和服务器都可以来回发送消息。任何关于我如何做到这一点的建议都将不胜感激。我知道我需要编辑我的ChatServer类,如下所示带有服务器到客户端消息传递的Android应用程序,android,client,server,messaging,Android,Client,Server,Messaging,我现在正在创建一个Android应用程序,它允许客户端到服务器的消息传递,但我正在寻找一种同时允许服务器到客户端消息传递的方法,这样客户端和服务器都可以来回发送消息。任何关于我如何做到这一点的建议都将不胜感激。我知道我需要编辑我的ChatServer类,如下所示 import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.Pri
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.LinkedList;
import java.util.List;
public class ChatServer {
private static final String USAGE = "Usage: java ChatServer";
/** Default port number on which this server to be run. */
private static final int PORT_NUMBER = 8008;
/**
* List of print writers associated with current clients, one for each.
*/
private List<PrintWriter> clients;
/** Creates a new server. */
public ChatServer() {
clients = new LinkedList<PrintWriter>();
}
/** Starts the server. */
public void start() {
System.out.println("AndroidChatApplication server started on port "
+ PORT_NUMBER + "!");
try {
ServerSocket s = new ServerSocket(PORT_NUMBER);
for (;;) {
Socket incoming = s.accept();
new ClientHandler(incoming).start();
}
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("AndroidChatApplication server stopped.");
}
/** Adds a new client identified by the given print writer. */
private void addClient(PrintWriter out) {
synchronized (clients) {
clients.add(out);
}
}
/** Adds the client with given print writer. */
private void removeClient(PrintWriter out) {
synchronized (clients) {
clients.remove(out);
}
}
/** Broadcasts the given text to all clients. */
private void broadcast(String msg) {
for (PrintWriter out : clients) {
out.println(msg);
out.flush();
}
}
public static void main(String[] args) {
if (args.length > 0) {
System.out.println(USAGE);
System.exit(-1);
}
new ChatServer().start();
}
/**
* A thread to serve a client. This class receive messages from a client and
* broadcasts them to all clients including the message sender.
*/
private class ClientHandler extends Thread {
/** Socket to read client messages. */
private Socket incoming;
/** Creates a hander to serve the client on the given socket. */
public ClientHandler(Socket incoming) {
this.incoming = incoming;
}
/** Starts receiving and broadcasting messages. */
public void run() {
PrintWriter out = null;
try {
out = new PrintWriter(new OutputStreamWriter(
incoming.getOutputStream()));
// inform the server of this new client
ChatServer.this.addClient(out);
out.print("Welcome to AndroidChatApplication! ");
out.println("Enter BYE to exit.");
out.flush();
BufferedReader in = new BufferedReader(new InputStreamReader(
incoming.getInputStream()));
for (;;) {
String msg = in.readLine();
if (msg == null) {
break;
} else {
if (msg.trim().equals("BYE"))
break;
System.out.println("Received: " + msg);
// broadcast the receive message
ChatServer.this.broadcast(msg);
}
}
incoming.close();
ChatServer.this.removeClient(out);
} catch (Exception e) {
if (out != null) {
ChatServer.this.removeClient(out);
}
e.printStackTrace();
}
}
}
}
导入java.io.BufferedReader;
导入java.io.InputStreamReader;
导入java.io.OutputStreamWriter;
导入java.io.PrintWriter;
导入java.net.ServerSocket;
导入java.net.Socket;
导入java.util.LinkedList;
导入java.util.List;
公共类聊天服务器{
私有静态最终字符串用法=“用法:JavaChatServer”;
/**运行此服务器的默认端口号*/
专用静态最终int端口号=8008;
/**
*与当前客户端关联的打印写入程序列表,每个客户端一个。
*/
私人名单客户;
/**创建一个新服务器*/
公共聊天服务器(){
clients=newlinkedlist();
}
/**启动服务器*/
公开作废开始(){
System.out.println(“AndroidChatApplication服务器已在端口上启动”
+端口号+“!”;
试一试{
ServerSocket s=新的ServerSocket(端口号);
对于(;;){
套接字传入=s.accept();
新的ClientHandler(传入).start();
}
}捕获(例外e){
e、 printStackTrace();
}
System.out.println(“AndroidChatApplication服务器已停止”);
}
/**添加由给定打印编写器标识的新客户端*/
专用void addClient(打印输出){
已同步(客户端){
客户。添加(输出);
}
}
/**添加具有给定打印编写器的客户端*/
私有void removeClient(打印输出){
已同步(客户端){
客户。移除(移出);
}
}
/**将给定文本广播到所有客户端*/
专用无效广播(字符串消息){
用于(打印输出:客户端){
out.println(msg);
out.flush();
}
}
公共静态void main(字符串[]args){
如果(args.length>0){
System.out.println(用法);
系统退出(-1);
}
新建聊天服务器().start();
}
/**
*为客户机服务的线程。此类从客户机接收消息并
*将它们广播到包括消息发送者在内的所有客户端。
*/
私有类ClientHandler扩展线程{
/**用于读取客户端消息的套接字*/
专用插座输入;
/**创建一个hander,在给定套接字上为客户端提供服务*/
公用ClientHandler(套接字传入){
this.incoming=传入;
}
/**开始接收和广播消息*/
公开募捐{
PrintWriter out=null;
试一试{
out=新的PrintWriter(新的OutputStreamWriter(
incoming.getOutputStream());
//将此新客户端通知服务器
ChatServer.this.addClient(out);
打印(“欢迎使用AndroidChatApplication!”);
out.println(“输入再见退出”);
out.flush();
BufferedReader in=新的BufferedReader(新的InputStreamReader(
incoming.getInputStream());
对于(;;){
字符串msg=in.readLine();
如果(msg==null){
打破
}否则{
如果(msg.trim().equals(“BYE”))
打破
System.out.println(“接收:+msg”);
//广播接收信息
ChatServer.this.broadcast(msg);
}
}
incoming.close();
ChatServer.this.removeClient(out);
}捕获(例外e){
if(out!=null){
ChatServer.this.removeClient(out);
}
e、 printStackTrace();
}
}
}
}
您只需使用谷歌推送通知服务,查看和好友以了解更多详细信息。这里有一些关于如何使用它的信息