package gz.itcast.e_thread;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * servlet的多線程並發問題
 * @author APPle
 *
 */
public class TheradDemo extends
 
 HttpServlet {
    
    int count = 1;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=utf-8");
        
        synchronized (TheradDemo.class) {//鎖對象必須唯一。建議使用類對象
            response.getWriter().write("你現在是當前網站的第"+count+"個訪客");   //
 
線程1執行完  ， 線程2執行
        
        //線程1還沒有執行count++
        /*try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }*/
            count++;
        }
    }

}

servlet的多線程並發問題