我有一个Server类和一个在Android设备上运行的Client类。基本上，我需要加载用户的朋友和他们的IP地址。用户的朋友存储在ArrayList中。因此，客户端必须发送朋友的姓名，如果朋友在线或者是＆＃34; -1，则服务器将使用IP地址进行响应。如果朋友离线服务器可以访问所有用户并将其存储在我定义类型的Arraylist中。我的问题是客户端没有收到IP地址/＆＃34; -1＆＃34;从服务器，因此只有一个朋友被检查，因为服务器正在等待响应。客户登录在其他地方完成，并且工作正常。 服务器：
public class Server {
private static final int port = 9001;
private static final String IPAddr = "xxx.xxx.xx.10";
ServerSocket server = null;
ArrayList <Client> users = new ArrayList<Client>();
public Server(){
readUsers();
try{
server = new ServerSocket(port);
System.out.println("connected server on port" + port);
while(true){
System.out.println("waiting for connection my ip add is "+ InetAddress.getLocalHost().getHostAddress());
Socket clientsocket = server.accept();
System.out.println("Connect to client:"+ clientsocket.getInetAddress().getHostName());
ClientThread client = new ClientThread(clientsocket);
client.start();
}
} catch(IOException e) {
System.err.println("Could not listen on port");
}
}
public void readUsers() {
//read form user text file on start up
ReadFile reader = new ReadFile("users.txt");
try{
String[] data = reader.OpenFile();
for (int i = 0 ; i<data.length; i++){
String[] parts = data[i].split(" ");
ArrayList<String> ips = new ArrayList<String>();
for(int j =2; j<parts.length; j++){
ips.add(parts[j]);
}
Client clnt = new Client(parts[0],parts[1], ips);
users.add(clnt);
}
}catch(Exception e){
System.err.println("Couldn't read in data");
}
}
public void RegisterUser(){
//append to user text if a new user registers
}
//Thread
public class ClientThread extends Thread {
private Socket sckt = null;
private String purpose;
ObjectOutputStream objectOutput;
ObjectInputStream objectInput;
public ClientThread(Socket sckt){
super("ClientThread");
this.sckt = sckt;
}
public void run(){
try{
objectOutput = new ObjectOutputStream(sckt.getOutputStream());
objectOutput.flush();
objectInput = new ObjectInputStream(sckt.getInputStream());
purpose = objectInput.readUTF();
if(purpose.contains("login")){
LoginUser();
}else {
LoadClientIP();
}
} catch(Exception e){
System.err.println("Couldnt read purpose: "+ purpose);
}
}
public void LoginUser(){
try{
String Username = objectInput.readUTF();
String Password = objectInput.readUTF();
int ClientIndex = isClient(Username);
if (ClientIndex != -1){
if(users.get(ClientIndex).password.equals(Password)){
//password correct -> send friends
users.get(ClientIndex).online = true;
users.get(ClientIndex).SetCurrentIP(sckt.getRemoteSocketAddress().toString());
objectOutput.writeUTF("correct");
System.out.println(Username + " is correct");
LoadClientFriends(Username, ClientIndex);
objectOutput.writeObject(users.get(ClientIndex).Friends);
System.out.println("Friends sent");
} else {
//password incorrect -> retry
objectOutput.writeUnshared("password");
System.out.println(Username + " has wrong password");
}
} else {
//not a registered client
objectOutput.writeUTF("wrong");
System.out.println(Username + " is not a client");
}
} catch(Exception e){
System.err.println("Couldnt connect to Client socket");
}
}
public void LoadClientIP(){
try{
int size = Integer.parseInt(objectInput.readUTF()); //keep track of the number of friends
System.out.println("The size of friends:"+ size);
for (int j =0; j<size; j++){
String client = objectInput.readUTF();
System.out.println("Client: "+ client);
int i = isClient(client); //index of friend is user arraylist
if (users.get(i).online == true){
String IP_add = users.get(i).IP.get(users.get(i).CurrentIP);
objectOutput.writeUTF(IP_add);
System.out.println("Client is at index i "+ i + " with IP "+ IP_add);
}else {
objectOutput.writeUTF("-1");
System.out.println("Client is not online");
}
}
System.out.println("out of while");
}catch (Exception e){
System.err.println("Couldn't load IP");
}
}
}
public void LoadClientFriends(String name, int index){
//upon a client signing in, server must load his friends contacts
ReadFile reader = new ReadFile(name+".txt");
try{
String[] data = reader.OpenFile();
for (int i = 0 ; i<data.length; i++){
users.get(index).Friends.add(data[i]);
}
}catch(Exception e){
System.err.println("Couldn't read in friend data");
}
}
public int isClient(String name){
boolean isclient = false;
int i =0;
int index =-1;
while((isclient == false) && (i<users.size())){
if (name.equals(users.get(i).Username)){
isclient = true;
index = i;
}else {
i++;
}
}
return index;
}
public static void main(String[] args){
Server svr = new Server();
}
}
客户端/ Android：
public class chat_screen extends ActionBarActivity {
ArrayList<String> friends;
ArrayList<String> onlineIP;
ArrayList<String> onlineFriend;
private static final int port = 9001;
private static final String IPAddr = "xx.x.x.4";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.chat_menu);
friends = (ArrayList<String>) getIntent().getSerializableExtra("Friends");
Thread FriendThread = new Thread(Connect);
FriendThread.start();
}
//Thread
Runnable Connect = new Runnable()
{
public void run()
{
try {
//Problems: getting stuck when reading in friends, only is able to send the first friend
Socket connection = new Socket(IPAddr,port);
ObjectOutputStream objectout = new ObjectOutputStream(connection.getOutputStream());
objectout.flush();
ObjectInputStream objectin = new ObjectInputStream(connection.getInputStream());
//send purpose
objectout.writeUTF("load");
objectout.flush();
objectout.writeUTF(Integer.toString(friends.size()));
objectout.flush();
//send friends name to get IP
for(int i =0; i<friends.size(); i++){
objectout.writeUTF(friends.get(i));
objectout.flush();
String ip = objectin.readUTF(); //stuck on this line
if ((ip.contains("-1"))== false){
onlineIP.add(ip);
onlineFriend.add(friends.get(i));
}else {
//do nothing
}
}
connection.close();
}catch (Exception e){
finish();
}
}
};
}