JAVA---session
2022/5/1 17:12:49
本文主要是介绍JAVA---session,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
package servlet; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.io.IOException; /** * * * @create 2022-05-01 16:28 */ public class SessionServlet extends BaseServlet { protected void createOrGetSession(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //创建和获取session会话对象 HttpSession session = req.getSession(); //判断当前Session会话,是否是新创建出来的 boolean isNew = session.isNew(); //获取Session会话的唯一标识id String id = session.getId(); resp.getWriter().write("得到的session,它的id是:" + id + "<br/>"); resp.getWriter().write("这个Session是否是新创建的" + isNew + "<br/>"); } protected void setAttribute(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.getSession().setAttribute("key1", "value1"); resp.getWriter().write("向session中保存了数据"); } protected void getAttribute(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { Object key1 = req.getSession().getAttribute("key1"); resp.getWriter().write("从session中获取出key1的数据是:"+key1); } protected void defaultLife(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //获取session的默认超时时长 int maxInactiveInterval = req.getSession().getMaxInactiveInterval(); resp.getWriter().write("Session的默认超时时长为:"+maxInactiveInterval+"秒"); } protected void life3(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //获取session对象 HttpSession session = req.getSession(); //设置当前Session3秒后超时 session.setMaxInactiveInterval(3); resp.getWriter().write("当前sessin已经设置为3秒后超时"); } protected void deleteNow(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //先获取session对象 HttpSession session = req.getSession(); //让session会话马上超时 session.invalidate(); resp.getWriter().write("session已经设置为超时(无效)"); } }
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