package com.sun.socket; 
import Java.io.IOException; 
import java.NET.*; 
import java.io.*; 
import java.util.*;

/** 
* Description: 
* 搭建一個Socket服務器響應多用戶訪問 
* @author Lee 
* */ 
public class ServerSocketDemo { 
ArrayList MSG = new ArrayList<>(); 
ArrayList RES = new ArrayList<>();

/**
 * Description:
 * 初始化數據
 * */
public void init(){
  MSG.add("hellow");
  RES.add("hi");
}

/**
 * Description:
 * 搭建一個Socket服務器響應多個用戶訪問
 * */
public void test1(){
  init();
  ServerSocket server = null;

  try{
    //以指定端口搭建一個Socket服務端
    server = new ServerSocket(12000);  

    //等待客戶端Socket實例，并創建一個線程去響應該客戶單實例
    while(true){
      new Response(server.accept()).start();;
    }

  }catch(IOException e){
    e.printStackTrace();
  }finally{
    try{
      server.close();
    }catch(IOException e){
      e.printStackTrace();
    }

  }
}

/**
 * Description:
 * 根據用戶輸入的內容，返回相應的內容
 * 
 * @param msg 客戶端輸入的內容
 * @return 返回服務端回復的內容
 * */
public String getMsg(String msg){
  String res = "Are you kidding me?Please speak English.";

  for(int i=1;i<MSG.size();i++){
    if(msg.contains(MSG.get(i))){
      res = RES.get(i);
    }
  }

  return res;
}


public static void main(String[] args) {
  // TODO Auto-generated method stub
  new ServerSocketDemo().test1();
}

/**
 * Description:
 * 響應用戶
 * @author Lee
 * */
class Response extends Thread{
  Socket client;

  /**
   * Description:
   * 默認構造器 
   * */
  public Response(){}
  /**
   * Description:
   * 初始化Socket
   * */
  public Response(Socket client){
    this.client = client;
  }

  @Override
  public void run(){
    Scanner input = null;
    PrintWriter output = null;

    try{
      //獲取用戶端的輸入和輸出流
      input = new Scanner(client.getInputStream());
      output = new PrintWriter(client.getOutputStream());

      output.println("歡迎訪問!");
      output.flush();

      //等待客戶端的輸入
      String content = null;
      while(input.hasNext()){
        content = input.nextLine();

        //根據用戶端的輸入，做出相應的反應
        if(content.equalsIgnoreCase("quit")){
          break;
        }else{
          output.println(getMsg(content));
          output.flush();
        }
      }

    }catch(IOException e){
      e.printStackTrace();
    }finally{
      //關閉資源
      input.close();
      output.close();
    }


  }
}
}

package com.sun.socket;
import org.junit.Assert;
import org.junit.Test;
public class ServerSocketDemoTest {
  @Test
  public void testGetMsg() {
    try{
      //調用該方法，并與其目標值進行對比。
      String msg = new ServerSocketDemo().getMsg("在嗎");
      Assert.assertEquals("gun!", msg);

    }catch(Exception e){
      e.printStackTrace();
    }
  }

}