public class ClientSide {
    //服務端IP
    private String serverIP;
    //端口號
    private int port;

    public ClientSide(String serverIP,int port){
        this.serverIP=serverIP;
        this.port=port;
    }

    public void initClient(){
       try{
           //創建socket，連接服務端
           Socket client=new Socket(serverIP,port);
           //新建讀取信息緩存區
           BufferedReader bufferedReader=null;
           //新建寫入字符流
           PrintWriter printWriter=null;
           //控制臺輸入
            Scanner scanner = new Scanner(System.in);

           //獲得輸入流，將數據載入緩存區
           bufferedReader=new BufferedReader(new InputStreamReader(client.getInputStream()));
           //輸出流,true為開啟自動釋放flush
           printWriter=new PrintWriter(client.getOutputStream(),true);
           //接收歡迎詞
           System.out.println(readMessage(bufferedReader));
           String flag="";
           while (!flag.equals(Config.LoginSuccessCode)){
               //接收‘輸入用戶名‘
               System.out.println(readMessage(bufferedReader));
               //控制臺輸入
               String username = scanner.nextLine();
               sentMessage(printWriter,username);
               //接收‘輸入密碼‘
               System.out.println(readMessage(bufferedReader));
               //控制臺輸入
               String psw = scanner.nextLine();
               sentMessage(printWriter,psw);
               //得到登錄結果
               flag=readMessage(bufferedReader);
               if(Config.LoginErrCode.equals(flag)){
                   System.out.println("---用戶名密碼不匹配，請重新登錄！---");
               }
           }
           System.out.println("---歡迎使用聊天室，祝你聊天愉快---");
           //登錄成功，開始聊天
           if(flag.equals(Config.LoginSuccessCode)){
               //讀取信息線程
               new ReadClientThread(client.getInputStream()).start();
               //輸入信息線程
               new SentClientThread(printWriter).start();

           }else{
               System.out.println("登錄異常！");
           }


       }catch (Exception e){
           System.out.println("發生異常，請聯系管理員！");
       }
    }

    /**
     * 讀取信息
     * @param bufferedReader
     */
    public String readMessage(BufferedReader bufferedReader) {
        String clinetMessage=null;
        try {
            clinetMessage= bufferedReader.readLine();
           // System.out.println("服務端："+clinetMessage);
        }catch (Exception e){
            System.out.println("發生異常，請聯系管理員！");
            //e.printStackTrace();
        }
        return clinetMessage;
    }

    /**
     * 發送信息
     * @param printWriter
     * @param message
     */
    public void sentMessage(PrintWriter printWriter,String message){
        printWriter.println(message);
        printWriter.flush();
    }

    public static void main(String[] args){
        ClientSide clientSide=new ClientSide("127.0.0.1",5000);
        clientSide.initClient();
    }

}

　　參考鏈接：https://blog.csdn.net/BlueSky_USC/article/details/54414860

聊天室實現-客戶端實現