servlet线程安全问题

测试servlet线程安全问题

1.新建一个servletThread的类代码如下：

packageeduask;

importjava.io.IOException;

importjavax.servlet.ServletException;

importjavax.servlet.http.HttpServlet;

importjavax.servlet.http.HttpServletRequest;

importjavax.servlet.http.HttpServletResponse;

//Servlet线程安全问题;

publicclassServletThreadextendsHttpServlet{

//定义一个全局变量;

inti=0;

@Override

protectedvoidservice(HttpServletRequest arg0, HttpServletResponse arg1)

throwsServletException, IOException {

synchronized(this) {

try{

i++;

Thread.sleep(1000);

System.out.println("这是第"+i+"次访问");

}catch(Exception e) {

//TODO: handle exception

}

}

}

}

2.配置web.xml，配置结果如下：

<!-- 测试servlet线程问题 -->

<servlet>

<servlet-name>servletThread</servlet-name>

<servlet-class>eduask.ServletThread</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>servletThread</servlet-name>

<url-pattern>/servletThread</url-pattern>

</servlet-mapping>

3.启动tomcat，在浏览器中输入：

http://localhost:8080/webDemo/servletThread

4.重复刷新5次，则会在控制台显示你已经访问了6次