📄 counterservlet.java
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package cn.com.tarena.web.servlet.day4;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class CounterServlet extends HttpServlet{
public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
//创建Session
HttpSession session = request.getSession(true);
session.setMaxInactiveInterval(60);
if(session.getAttribute("counter") != null){
int counter = (Integer)session.getAttribute("counter");
session.setAttribute("counter", counter + 1);
if(counter == 10){
//销毁session
session.invalidate();
return;
}
}else{
session.setAttribute("counter", 1);
}
//设置MINE格式
response.setContentType("text/html");
//获得能够往客户端输出HTML的书写器
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println(" <title>Counter</title>");
out.println("</head>");
out.println("<body>");
out.println("<h2 align=\"center\">Counter</h2>");
out.println("<hr>");
out.println("<center>" + session.getAttribute("counter") + "</center><br>");
out.println("<center>" + session.getId() + "</center><br>");
String path = response.encodeURL("counter");
out.println("<a href=\"" + path + "\">refresh</a>");
out.println("</body>");
out.println("</html>");
out.close();
}
public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
doGet(request,response);
}
}
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