J2ee注册的跳转和cookiesessionWord文档下载推荐.docx

J2ee注册的跳转和cookiesessionWord文档下载推荐.docx

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http:

//www.w3.org/2001/XMLSchema-instance"

xmlns="

//xmlns.jcp.org/xml/ns/javaee"

xsi:

schemaLocation="

//xmlns.jcp.org/xml/ns/javaeehttp:

//xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"

id="

WebApp_ID"

version="

3.1"

<

display-name>

libraryproject<

/display-name>

welcome-file-list>

welcome-file>

index.html<

/welcome-file>

index.htm<

index.jsp<

default.html<

default.htm<

default.jsp<

/welcome-file-list>

filter>

<

filter-name>

userFilter<

/filter-name>

filter-class>

com.chinasofti.eec.filter.UserFilter<

/filter-class>

/filter>

filter-mapping>

url-pattern>

/*<

/url-pattern>

/filter-mapping>

/web-app>

UserFilter.java

packagecom.chinasofti.eec.filter;

importjava.io.IOException;

importjavax.servlet.Filter;

importjavax.servlet.FilterChain;

importjavax.servlet.FilterConfig;

importjavax.servlet.ServletException;

importjavax.servlet.ServletRequest;

importjavax.servlet.ServletResponse;

importjavax.servlet.http.HttpServletRequest;

importjavax.servlet.http.HttpServletResponse;

publicclassUserFilterimplementsFilter{

@Override

publicvoiddestroy（）{

//TODOAuto-generatedmethodstub

}

publicvoiddoFilter（ServletRequestarg0,ServletResponsearg1,FilterChainarg2）

throwsIOException,ServletException{

HttpServletRequestreq=（HttpServletRequest）arg0;

HttpServletResponseresp=（HttpServletResponse）arg1;

req.setCharacterEncoding（"

utf-8"

）;

resp.setCharacterEncoding（"

arg2.doFilter（arg0,arg1）;

publicvoidinit（FilterConfigarg0）throwsServletException{

}

2通过cookie来存储登录的次数

Login.jsp

%@pagelanguage="

java"

contentType="

text/html;

charset=utf-8"

pageEncoding="

%>

!

DOCTYPEhtmlPUBLIC"

-//W3C//DTDHTML4.01Transitional//EN"

"

//www.w3.org/TR/html4/loose.dtd"

html>

head>

metahttp-equiv="

Content-Type"

content="

title>

Inserttitlehere<

/title>

/head>

body>

formaction="

login"

method="

post"

divalign="

center"

用户名：

inputtype="

text"

name="

user"

br/>

密&

nbsp;

&

码：

password"

pwd"

<

radio"

date"

value="

0"

checked="

checked"

每次登陆都需要

10"

10天内

30"

30天内<

submit"

btn"

登录"

&

注册"

/div>

/form>

/body>

/html>

LoginServlet.java

packageservlet;

importjavax.servlet.ServletContext;

importjavax.servlet.annotation.WebServlet;

importjavax.servlet.http.HttpServlet;

@WebServlet（"

/login"

）

publicclassLoginServletextendsHttpServlet{

protectedvoiddoGet（HttpServletRequestreq,HttpServletResponseresp）throwsServletException,IOException{

this.doPost（req,resp）;

protectedvoiddoPost（HttpServletRequestreq,HttpServletResponseresp）throwsServletException,IOException{

Stringbtn=req.getParameter（"

Stringname=req.getParameter（"

Stringpwd=req.getParameter（"

if（"

.equals（btn））{

if（"

admin"

.equals（name）&

"

.equals（pwd））{

ServletContextctxt=getServletContext（）;

intcount=0;

if（ctxt.getAttribute（"

count"

）==null）{

count=0;

}else{

count=Integer.parseInt（ctxt.getAttribute（"

）.toString（））;

}

count++;

ctxt.setAttribute（"

count）;

resp.sendRedirect（"

index.jsp"

}

}

Index.jsp

charset=UTF-8"

left"

fontcolor="

blue"

访问次数<

%=application.getAttribute（"

）%>

/font>

3通过cookie来存储对用户密码进行存储

内置对象来进行变量参数的赋值，通过req.getParament与req.setAttribute（”key”，vlaue）

right"

h1>

<

red"

欢迎<

%=session.getAttribute（"

userName"

登录

/h1>

%

Stringusername=null;

Stringpwd=null;

Cookie[]c=request.getCookies（）;

if（c!

=null&

c.length!

=0）{

for（Cookieco:

c）{

if（co.getName（）.equals（"

username"

））{/*不同页面中传值的变量是的双引号是键值*/

username=co.getValue（）;

/*同一个页面中传值的变量是自己本页面定义的变量不能直接拿，servlet中要通过req，resp来进行值的传递*/

}elseif（co.getName（）.equals（"

userpwd"

））{

pwd=co.getValue（）;

if（username!

=null&

pwd!

=null）{%>

%request.getRequestDispatcher（"

login?

user="

+username+"

pwd="

+pwd+"

btn=登录"

）.forward（request,response）;

importjavax.servlet.http.Cookie;

StringtimeLength=req.getParameter（"

/*name属性选择器中是页面上可以看见的键值变量*/

intdays=0;

if（timeLength!

=null）{

days=Integer.parseInt（timeLength）;

if（days!

Cookieusernamecookie=newCookie（"

name）;

Cookieuserpwd=newCookie（"

pwd）;

usernamecookie.setMaxAge（days*24*3600）;

userpwd.setMaxAge（days*24*36000）;

resp.addCookie（usernamecookie）;

resp.addCookie（userpwd）;

req.getSession（）.setAttribute（"

name）;