JSP (9)--jsp Sessions

Js|session on a classic website, visitors can browse several Web pages and perform some interactive behavior. If you are writing such a website, it is very useful to use some data from each user. For this purpose, we can use the "sessions" in the JSP.

Session is a user-related object. When a user visits a Web site, some data is stored in the session and extracted from the data when needed. The session saves different data for different users.

The following page places the user's name in the session and can display it elsewhere. First we're going to make a form and then name it getname.html

＜HTML＞

＜BODY＞

＜FORM METHOD=POST ACTION="SaveName.jsp"＞

What's your name? ＜INPUT TYPE=TEXT NAME=username SIZE=20＞

＜P＞＜INPUT TYPE=SUBMIT＞

＜/FORM＞

＜/BODY＞

＜/HTML＞

    这个表单的目标是“SaveName.jsp”，它在session保存了用户的名字。

＜%

String name = request.getParameter( "username" );

session.setAttribute( "theName", name );

%＞

＜HTML＞

＜BODY＞

＜A HREF="NextPage.jsp"＞Continue＜/A＞

＜/BODY＞

＜/HTML＞

SaveName.jsp在session保存了用户了名字，并连接到另外一个网页NextPage.jsp。NextPage.jsp 显示了怎样取出被保存的名字：

＜HTML＞

＜BODY＞

Hello, ＜%= session.getAttribute( "theName" ) %＞

＜/BODY＞

＜/HTML＞

If you open two different browsers, or run two browsers from two different machines, you can place a name in one browser and a different name in the other browser, but two names will be tracked. The session remains tracked until it times out, and it assumes that the user has not visited the site, so it is canceled.

Finally, decorate this tutorial with the link: Use session, in the above example to add a user's "age" attribute.