J2ee注册的跳转和cookiesession.docx
- 文档编号：5776183
- 上传时间：2023-01-01
- 格式：DOCX
- 页数：10
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J2ee注册的跳转和cookiesession.docx
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J2ee注册的跳转和cookiesession
登录与注册的基本思想
步骤1：
先写jsp的页面，登录的登录成功进入的界面注册的注册成功进入界面注册失败的
步骤2：
写servlet页面来进行登录注册的功能实现和页面跳转的功能
登录密码和用户名一致则跳至主页面
注册。
点击之后进入注册界面
步骤3写UserDao注册对数据库进行插入，Dao中的方法是insert。
Impl中执行的sql数据库语句
步骤4写service调用Dao中的insert方法，接口register（Useruser）UserDaoud.insert
步骤5写servlet调用service中的userServiceImpl.register（）前面要初始化变量Useruser中的req.getParament拿到值进行输出
1编码的问题
书写编码过滤器
Web.xml
xmlversion="1.0"encoding="UTF-8"?
>
xsi="http: //www.w3.org/2001/XMLSchema-instance"xmlns="http: //xmlns.jcp.org/xml/ns/javaee"xsi: schemaLocation="http: //xmlns.jcp.org/xml/ns/javaeehttp: //xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"id="WebApp_ID"version="3.1"> 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 } @Override publicvoiddoFilter（ServletRequestarg0,ServletResponsearg1,FilterChainarg2） throwsIOException,ServletException{ HttpServletRequestreq=（HttpServletRequest）arg0; HttpServletResponseresp=（HttpServletResponse）arg1; req.setCharacterEncoding（"utf-8"）; resp.setCharacterEncoding（"utf-8"）; arg2.doFilter（arg0,arg1）; } @Override publicvoidinit（FilterConfigarg0）throwsServletException{ //TODOAuto-generatedmethodstub } } 2通过cookie来存储登录的次数 Login.jsp <%@pagelanguage="java"contentType="text/html;charset=utf-8" pageEncoding="utf-8"%> DOCTYPEhtmlPUBLIC"-//W3C//DTDHTML4.01Transitional//EN""http: //www.w3.org/TR/html4/loose.dtd">
用户名：
密 码：
LoginServlet.java
packageservlet;
importjava.io.IOException;
importjavax.servlet.ServletContext;
importjavax.servlet.ServletException;
importjavax.servlet.annotation.WebServlet;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
@WebServlet（"/login"）
publicclassLoginServletextendsHttpServlet{
protectedvoiddoGet（HttpServletRequestreq,HttpServletResponseresp）throwsServletException,IOException{
//TODOAuto-generatedmethodstub
this.doPost（req,resp）;
}
@Override
protectedvoiddoPost（HttpServletRequestreq,HttpServletResponseresp）throwsServletException,IOException{
//TODOAuto-generatedmethodstub
req.setCharacterEncoding（"utf-8"）;
resp.setCharacterEncoding（"utf-8"）;
Stringbtn=req.getParameter（"btn"）;
Stringname=req.getParameter（"user"）;
Stringpwd=req.getParameter（"pwd"）;
if（"登录".equals（btn））{
if（"admin".equals（name）&&"admin".equals（pwd））{
ServletContextctxt=getServletContext（）;
intcount=0;
if（ctxt.getAttribute（"count"）==null）{
count=0;
}else{
count=Integer.parseInt（ctxt.getAttribute（"count"）.toString（））;
}
count++;
ctxt.setAttribute（"count",count）;
resp.sendRedirect（"index.jsp"）;
}
}
}
}
Index.jsp
<%@pagelanguage="java"contentType="text/html;charset=UTF-8"
pageEncoding="UTF-8"%>
DOCTYPEhtmlPUBLIC"-//W3C//DTDHTML4.01Transitional//EN""http:
//www.w3.org/TR/html4/loose.dtd">
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）
Index.jsp
<%@pagelanguage="java"contentType="text/html;charset=UTF-8"
pageEncoding="UTF-8"%>
DOCTYPEhtmlPUBLIC"-//W3C//DTDHTML4.01Transitional//EN""http:
//www.w3.org/TR/html4/loose.dtd">
Login.jsp
<%@pagelanguage="java"contentType="text/html;charset=utf-8"
pageEncoding="utf-8"%>
DOCTYPEhtmlPUBLIC"-//W3C//DTDHTML4.01Transitional//EN""http:
//www.w3.org/TR/html4/loose.dtd">
<%
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）;
}
}
%>
用户名：
密 码：
LoginServlet.java
packageservlet;
importjava.io.IOException;
importjavax.servlet.ServletContext;
importjavax.servlet.ServletException;
importjavax.servlet.annotation.WebServlet;
importjavax.servlet.http.Cookie;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
@WebServlet（"/login"）
publicclassLoginServletextendsHttpServlet{
protectedvoiddoGet（HttpServletRequestreq,HttpServletResponseresp）throwsServletException,IOException{
//TODOAuto-generatedmethodstub
this.doPost（req,resp）;
}
@Override
protectedvoiddoPost（HttpServletRequestreq,HttpServletResponseresp）throwsServletException,IOException{
//TODOAuto-generatedmethodstub
req.setCharacterEncoding（"utf-8"）;
resp.setCharacterEncoding（"utf-8"）;
Stringbtn=req.getParameter（"btn"）;
Stringname=req.getParameter（"user"）;
Stringpwd=req.getParameter（"pwd"）;
if（"登录".equals（btn））{
if（"admin".equals（name）&&"admin".equals（pwd））{
StringtimeLength=req.getParameter（"date"）;/*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!
=0）{
Cookieusernamecookie=newCookie（"username",name）;
Cookieuserpwd=newCookie（"userpwd",pwd）;
usernamecookie.setMaxAge（days*24*3600）;
userpwd.setMaxAge（days*24*36000）;
resp.addCookie（usernamecookie）;
resp.addCookie（userpwd）;
}
req.getSession（）.setAttribute（"userName",name）;
resp.sendRedirect（"index.jsp"）;
}
}
}
}
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