counterdemo.java
来自「jsp-公司管理系统-注册、会员管理等功能」· Java 代码 · 共 48 行
JAVA
48 行
import javax.servlet.http.HttpServlet;
import javax.servlet.ServletConfig;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpSession;
import javax.servlet.ServletContext;
import java.io.PrintWriter;
public class CounterDemo extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException,ServletException
{
HttpSession httpSession=request.getSession(true);
ServletContext sContext=getServletContext();
Integer counter=(Integer)sContext.getAttribute("counter");
int count;
//新连接者
if(httpSession.getAttribute("connected")==null){
httpSession.setAttribute("connected","ok");
if(counter==null){ //计数器未空，将建立一个全局变量.
sContext.setAttribute("counter",new Integer(1));
count=1;
}
else{ //将计数器加1
count=counter.intValue();
count++;
//重新设置counter值
sContext.setAttribute("counter",new Integer(count));
}
}
else{ //已连接者
count=counter.intValue();
}
//输出本页调用次数
response.setContentType("text/html;charset=GB2312");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>样例网页</title>");
out.println("</head>");
out.println("<body>");
out.println("本日人气:"+count);
out.println("</body>");
out.println("</html>");
}
}
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