Session保存用户名
1.构造登录界面
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<!
DOCTYPE
html>
<
html
>
<
head
>
<
meta
charset="UTF-8">
<
title
>Session保存用户名</
title
>
</
head
>
<
body
>
<
form
action="doS3" method= "post">
用户名:<
input
type="text" name="name"/><
br
/>
密 码:<
input
type="password" name = "pwd"><
br
/>
<
input
type="submit">
</
form
>
</
body
>
</
html
>
|
2.获取Session并将用户名保存到Session域对象中
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package
com.oaec.session;
import
java.io.IOException;
import
java.util.Date;
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
servletDemo3
extends
HttpServlet {
@Override
protected
void
doGet(HttpServletRequest req, HttpServletResponse resp)
throws
ServletException, IOException {
req.setCharacterEncoding(
"UTF-8"
);
resp.setContentType(
"text/html;charset=UTF-8"
);
// req.getAttribute(arg0)
String name = req.getParameter(
"name"
);
String pwd = req.getParameter(
"pwd"
);
if
(
"高圆圆"
.equals(name) &&
"123"
.equals(pwd)) {
// 将用户名保存在session中
// 1.获得session
HttpSession session = req.getSession();
// 2.将用户名保存在session中
session.setAttribute(
"uname"
, name);
resp.sendRedirect(
"doS4"
);
}
else
{
resp.sendRedirect(
"index.html"
);
}
}
@Override
protected
void
doPost(HttpServletRequest req, HttpServletResponse resp)
throws
ServletException, IOException {
doGet(req, resp);
}
}
|
3.从Session中取出数据 并对页面进行保护 没有登录通过URL访问 直接重定向到登录界面 即主页
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package
com.oaec.session;
import
java.io.IOException;
import
java.io.PrintWriter;
import
java.util.Date;
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
servletDemo4
extends
HttpServlet{
@Override
protected
void
doGet(HttpServletRequest req, HttpServletResponse resp)
throws
ServletException, IOException {
req.setCharacterEncoding(
"UTF-8"
);
resp.setContentType(
"text/html;charset=UTF-8"
);
//从session中取出数据
HttpSession session = req.getSession(
false
);
Object object =
null
;
if
(session !=
null
&& (object = session.getAttribute(
"uname"
))!=
null
) {
PrintWriter writer = resp.getWriter();
writer.write(
"登录成功<br>"
);
writer.write(
"欢迎你"
+object);
}
else
{
//没有登录过 直接重定向到主页
resp.sendRedirect(
"index.html"
);
}
}
@Override
protected
void
doPost(HttpServletRequest req, HttpServletResponse resp)
throws
ServletException, IOException {
doGet(req, resp);
}
}
|
Session保存用户名
1.构造登录界面
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
|
<!
DOCTYPE
html>
<
html
>
<
head
>
<
meta
charset="UTF-8">
<
title
>Session保存用户名</
title
>
</
head
>
<
body
>
<
form
action="doS3" method= "post">
用户名:<
input
type="text" name="name"/><
br
/>
密 码:<
input
type="password" name = "pwd"><
br
/>
<
input
type="submit">
</
form
>
</
body
>
</
html
>
|
2.获取Session并将用户名保存到Session域对象中
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
package
com.oaec.session;
import
java.io.IOException;
import
java.util.Date;
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
servletDemo3
extends
HttpServlet {
@Override
protected
void
doGet(HttpServletRequest req, HttpServletResponse resp)
throws
ServletException, IOException {
req.setCharacterEncoding(
"UTF-8"
);
resp.setContentType(
"text/html;charset=UTF-8"
);
// req.getAttribute(arg0)
String name = req.getParameter(
"name"
);
String pwd = req.getParameter(
"pwd"
);
if
(
"高圆圆"
.equals(name) &&
"123"
.equals(pwd)) {
// 将用户名保存在session中
// 1.获得session
HttpSession session = req.getSession();
// 2.将用户名保存在session中
session.setAttribute(
"uname"
, name);
resp.sendRedirect(
"doS4"
);
}
else
{
resp.sendRedirect(
"index.html"
);
}
}
@Override
protected
void
doPost(HttpServletRequest req, HttpServletResponse resp)
throws
ServletException, IOException {
doGet(req, resp);
}
}
|
3.从Session中取出数据 并对页面进行保护 没有登录通过URL访问 直接重定向到登录界面 即主页
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
package
com.oaec.session;
import
java.io.IOException;
import
java.io.PrintWriter;
import
java.util.Date;
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
servletDemo4
extends
HttpServlet{
@Override
protected
void
doGet(HttpServletRequest req, HttpServletResponse resp)
throws
ServletException, IOException {
req.setCharacterEncoding(
"UTF-8"
);
resp.setContentType(
"text/html;charset=UTF-8"
);
//从session中取出数据
HttpSession session = req.getSession(
false
);
Object object =
null
;
if
(session !=
null
&& (object = session.getAttribute(
"uname"
))!=
null
) {
PrintWriter writer = resp.getWriter();
writer.write(
"登录成功<br>"
);
writer.write(
"欢迎你"
+object);
}
else
{
//没有登录过 直接重定向到主页
resp.sendRedirect(
"index.html"
);
}
}
@Override
protected
void
doPost(HttpServletRequest req, HttpServletResponse resp)
throws
ServletException, IOException {
doGet(req, resp);
}
}
|