Servlet多线程测试

1. Servlet在运行时只有一个实例，但是service方法是多线程的
2. 通过重写doGet方法进行测试

   	/**
   	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
   	 */
   	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   		System.out.println(new Date()+":处理get请求------");
   		System.out.println("实例地址为："+this+";hashCode:"+this.hashCode());
   		System.out.println("当前线程："+Thread.currentThread());
   		
   	}

3. 测试输出结果

   Sun Jan 14 19:31:28 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-4,5,main]
   Sun Jan 14 19:31:29 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-5,5,main]
   Sun Jan 14 19:31:29 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-6,5,main]
   Sun Jan 14 19:31:29 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-7,5,main]
   Sun Jan 14 19:31:30 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-9,5,main]
   Sun Jan 14 19:31:30 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-8,5,main]
   Sun Jan 14 19:31:30 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-10,5,main]
   Sun Jan 14 19:31:30 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-1,5,main]
   Sun Jan 14 19:31:30 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-2,5,main]
   Sun Jan 14 19:31:31 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-3,5,main]
   Sun Jan 14 19:31:31 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-4,5,main]
   Sun Jan 14 19:31:31 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-5,5,main]
   Sun Jan 14 19:31:31 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-6,5,main]
   Sun Jan 14 19:31:31 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-7,5,main]
   Sun Jan 14 19:31:31 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-9,5,main]
   Sun Jan 14 19:31:32 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-8,5,main]
   Sun Jan 14 19:31:32 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-10,5,main]
   Sun Jan 14 19:31:32 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-1,5,main]
   Sun Jan 14 19:31:32 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-2,5,main]
   Sun Jan 14 19:31:32 CST 2018:处理get请求------
   实例地址为：com.oracle.first.login@31f35411;hashCode:838030353
   当前线程：Thread[http-nio-8080-exec-3,5,main]

4. 由以上测试可知，Servlet实例只有一个，service方法是多线程的，当前线程被占用时，容器会调用新的线程进行处理请求
5. tomcat8采用循环分配线程的算法，进行调用service方法