📄 demosessionservlet.java

📁 用java编写的程序
💻 JAVA
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package webbook.chapter7;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Date;
import java.util.Enumeration;
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 DemoSessionServlet extends HttpServlet {
	private static final long serialVersionUID = 3144436730239445373L;

	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		HttpSession session = request.getSession();
		Integer counter = (Integer) session.getAttribute("counter");
		if (counter == null) {
			counter = new Integer(1);
		} else {
			counter = new Integer(counter.intValue() + 1);
		}
		session.setAttribute("counter", counter);
		session.setMaxInactiveInterval(3600);

		response.setContentType("text/html;charset=UTF-8");
		PrintWriter out = response.getWriter();
		out.println("<html>");
		out.println("<head><title>session demo servlet</title></head>");
		out.println("<body>");
		out.println("<h1>使用session的演示</h1>");
		out.println("你已经访问了" + counter + "次.<br><br>");
		if (session.isNew()) {
			out.println("这是一个新建的Session.<br><br>");
		} else {
			out.println("这不是一个新建的Session.<br><br>");
		}
		out.println("jsessionid: " + session.getId() + "<br><br>");
		out.println("LastAccessedTime: " + session.getLastAccessedTime() + "<br>");
		out.println("格式转换以后的LastAccessedTime: " + new Date(session.getLastAccessedTime()) + "<br><br>");
		out.println("CreationTime: " + session.getCreationTime() + "<br>");
		out.println("格式转换以后的CreationTime: " + new Date(session.getCreationTime()) + "<br><br>");
		out.println("MaxInactiveInterval: " + session.getMaxInactiveInterval() + "秒<br>");
		out.println("<br>使用Session对象的getAttributeNames<br>");
		Enumeration enumer = session.getAttributeNames();
		String name = null;
		while (enumer.hasMoreElements()) {
			name = (String) enumer.nextElement();
			out.println("Session name:" + name + "<br>");
			out.println("Session value:" + session.getAttribute(name) + "<br>");
		}
		// session.removeAttribute("counter");
		// session.invalidate();
		out.println("</body>");
		out.println("</html>");
		out.flush();
		out.close();
	}
}
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