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

1、http:/www.w3.org/2001/XMLSchema-instance xmlns=/xmlns.jcp.org/xml/ns/javaee xsi:schemaLocation=/xmlns.jcp.org/xml/ns/javaee http:/xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd id=WebApp_ID version=3.1 libraryprojectwelcome-file-listwelcome-fileindex.htmlindex.htmindex.jspdefault.htmldefault.htmdefault

2、.jspfilter userFilterfilter-classcom.chinasofti.eec.filter.UserFilter/filterfilter-mappingurl-pattern/* /filter-mapping/web-appUserFilter.javapackage com.chinasofti.eec.filter;import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;im

3、port javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class UserFilter implements Filter Override public void destroy（） / TODO Auto-generated metho

4、d stub public void doFilter（ServletRequest arg0, ServletResponse arg1, FilterChain arg2） throws IOException, ServletException HttpServletRequest req = （HttpServletRequest）arg0; HttpServletResponse resp = （HttpServletResponse）arg1; req.setCharacterEncoding（utf-8）; resp.setCharacterEncoding（ arg2.doFi

5、lter（arg0, arg1）; public void init（FilterConfig arg0） throws ServletException 2 通过cookie来存储登录的次数Login.jsp% page language=java contentType=text/html; charset=utf-8 pageEncoding=%!DOCTYPE html PUBLIC -/W3C/DTD HTML 4.01 Transitional/EN /www.w3.org/TR/html4/loose.dtdhtmlheadmeta http-equiv=Content-Type

6、 content=titleInsert title here/headbodyform action=login method=postdiv align=center 用户名：input type=text name=userbr / 密 &码：passwordpwd radiodate value=0 checked=checked 每次登陆都需要1010天内3030天内/form/body/htmlLoginServlet.javapackage servlet;import javax.servlet.ServletContext;import javax.servlet.

7、annotation.WebServlet;import javax.servlet.http.HttpServlet;WebServlet（/login）public class LoginServlet extends HttpServlet protected void doGet（HttpServletRequest req, HttpServletResponse resp） throws ServletException, IOException this.doPost（req, resp）; protected void doPost（HttpServletRequest req

8、, HttpServletResponse resp） throws ServletException, IOException String btn = req.getParameter（ String name = req.getParameter（ String pwd = req.getParameter（ if（.equals（btn） if（admin.equals（name）&.equals（pwd） ServletContext ctxt = getServletContext（）; int count = 0; if（ctxt.getAttribute（count）=null

9、） count= 0; else count = Integer.parseInt（ctxt.getAttribute（）.toString（）; count+; ctxt.setAttribute（, count）; resp.sendRedirect（index.jsp Index.jsp charset=UTF-8leftfont color=blue访问次数 /font3 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）righth1 red欢迎 % String us

10、ername = null; String pwd = null; Cookie c = request.getCookies（）; if（c!=null& c.length!=0） for（Cookie co: 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*/ else if（co.getName（）.equals（userpwd） pwd = co

11、.getValue（）; if（username!=null & pwd !=null）% request.getRequestDispatcher（login?user=+username+pwd=+pwd+btn=登录）.forward（request, response）;import javax.servlet.http.Cookie; String timeLength = req.getParameter（ /*name属性选择器中是页面上可以看见的键值变量*/ int days = 0; if（timeLength!=null） days = Integer.parseInt（timeLength）; if（days! Cookie usernamecookie = new Cookie（,name）; Cookie userpwd = new Cookie（,pwd）; usernamecookie.setMaxAge（days*24*3600）; userpwd.setMaxAge（days*24*36000）; resp.addCookie（usernamecookie）; resp.addCookie（userpwd）; req.getSession（）.setAttribute（, name）;