J2EE Servlet 学习笔记4
2014-04-15 15:52
375 查看
<?xml version="1.0" encoding="gb2312"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<servlet>
<servlet-name>LogoutServlet</servlet-name>
<servlet-class>org.laotou99.abc4.servlet.LogoutServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LogoutServlet</servlet-name>
<url-pattern>/logout</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>GreetServlet</servlet-name>
<servlet-class>org.laotou99.abc4.servlet.GreetServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>GreetServlet</servlet-name>
<url-pattern>/greet</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>LoginChkServlet</servlet-name>
<servlet-class>org.laotou99.abc4.servlet.LoginChkServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginChkServlet</servlet-name>
<url-pattern>/loginchk</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>org.laotou99.abc4.servlet.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>LoginServlet2</servlet-name>
<servlet-class>org.laotou99.abc4.servlet.LoginServlet2</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet2</servlet-name>
<url-pattern>/login2</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>GreetServlet2</servlet-name>
<servlet-class>org.laotou99.abc4.servlet.GreetServlet2</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>GreetServlet2</servlet-name>
<url-pattern>/greet2</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>5</session-timeout>
</session-config>
</web-app>//OutputSessionInfo
package org.laotou99.abc4.servlet;
import java.io.*;
import javax.servlet.http.*;
import java.util.Date;
//javac -d ..\WEB-INF\classes OutputSessionInfo.java
public class OutputSessionInfo
{
public static void printSessionInfo(PrintWriter out,HttpSession session)
{
out.println("<table>");
out.println("<tr>");
out.println("<td>会话的状态</td>");
if(session.isNew())
{
out.println("<td>新的会话</td>");
}
else
{
out.println("<td>旧的会话</td>");
}
out.println("</tr>");
out.println("<tr>");
out.println("<td>会话ID</td>");
out.println("<td>"+session.getId()+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>创建时间：</td>");
out.println("<td>"+new Date(session.getCreationTime())+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>上次访问时间:</td>");
out.println("<td>"+new Date(session.getLastAccessedTime())+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>最大不活动时间间隔(s):</td>");
out.println("<td>"+session.getMaxInactiveInterval()+"</td>");
out.println("</tr>");
out.println("</table>");
}
}//LogoutServlet
package org.laotou99.abc4.servlet;
import javax.servlet.*;
import java.io.*;
import javax.servlet.http.*;
//javac -d ..\WEB-INF\classes LogoutServlet.java
public class LogoutServlet extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
resp.setContentType("text/html;charset=gb2312");
HttpSession session = req.getSession();
session.invalidate();
PrintWriter out = resp.getWriter();
out.println("<html><head><title>退出登入</title></head>");
out.println("<body>");
out.println("已退出登录<br>");
out.println("<a href=login>重新登录</a>");
out.println("</body></html>");
out.println("");
out.close();
}
}//LoginServlet2
package org.laotou99.abc4.servlet;
import javax.servlet.*;
import java.io.*;
import javax.servlet.http.*;
//javac -d ..\WEB-INF\classes LoginServlet2.java
public class LoginServlet2 extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
String action =req.getParameter("action");
if("chk".equals(action))
{
String name=req.getParameter("user");
String pwd=req.getParameter("password");
if((name!=null)&&(pwd!=null))
{
if(name.equals("zhangsan") && pwd.equals("1234"))
{
StringBuffer sb = new StringBuffer();
sb.append("username-");
sb.append(name);
sb.append("&password-");
sb.append(pwd);
Cookie cookie=new Cookie("userinfo",sb.toString());
cookie.setMaxAge(1800);
resp.addCookie(cookie);
resp.sendRedirect("greet2");
return;
}
else
{
resp.setContentType("text/html;charset=gb2312");
PrintWriter out = resp.getWriter();
out.println("用户名密码错误，请<a href=login2>重新登入</a>");
return;
}
}
}
else
{
resp.setContentType("text/html;charset=gb2312");
PrintWriter out = resp.getWriter();
out.println("<html>");
out.println("<meta http-equiv=\"Pragma\" content=\"no-cache\">");
out.println("<head><title>登录页面</title></head>");
out.println("<body>");
out.println("<p>");
out.println("<form method=post action=login2?action=chk>");
out.println("<table>");
out.println("<tr>");
out.println("<td>请输入用户名</td>");
out.println("<td><input type=text name=user></td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>请输入密码</td>");
out.println("<td><input type=password name=password></td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td><input type=reset value=重置></td>");
out.println("<td><input type=submit value=登入></td>");
out.println("</tr>");
out.println("</table></form></body></html>");
out.println("");
out.close();
}
}
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
doGet(req,resp);
}
}//LoginServlet
package org.laotou99.abc4.servlet;
import javax.servlet.*;
import java.io.*;
import javax.servlet.http.*;
//import OutputSessionInfo;
import org.laotou99.abc4.servlet.OutputSessionInfo;
//javac -d ..\WEB-INF\classes LoginServlet.java
public class LoginServlet extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
resp.setContentType("text/html;charset=gb2312");
HttpSession session=req.getSession();
String user=(String)session.getAttribute("user");
PrintWriter out=resp.getWriter();
out.println("<html>");
out.println("<meta http-equiv=\"Pragma\" content=\"no-cache\">");
out.println("<head><title>登入页面</title></head>");
out.println("<body>");
OutputSessionInfo.printSessionInfo(out,session);
out.println("<p>");
out.println("<form method=post action=loginchk");
out.println("<table>");
out.println("<tr>");
out.println("<td>请输入用户名</td>");
if(null==user)
{
out.println("<td><input type=text name=user></td>");
}
else
{
out.println("<td><input type=text name=user value="+ user +"></td>");
}
out.println("</tr>");
out.println("<tr>");
out.println("<td>请输入密码</td>");
out.println("<td><input type=password name=password></td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td><input type=reset value=重填></td>");
out.println("<td><input type=submit value=登入></td>");
out.println("</tr>");
out.println("</table>");
out.println("</form>");
out.println("</body>");
out.println("</html>");
out.println("");
out.close();
}
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
doGet(req,resp);
}
}//LoginChkServlet
package org.laotou99.abc4.servlet;
import javax.servlet.*;
import java.io.*;
import javax.servlet.http.*;
//javac -d ..\WEB-INF\classes LoginChkServlet.java
public class LoginChkServlet extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
//req.setCharacterEncoding("gb2312");
String name=req.getParameter("user");
String pwd=req.getParameter("password");
if(null==name || null==pwd || name.equals("") || pwd.equals(""))
{
resp.sendRedirect("login");
return;
}
else
{
HttpSession session=req.getSession();
session.setAttribute("user",name);
resp.sendRedirect("greet");
return;
}
}
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
doGet(req,resp);
}
}//GreetServlet2
package org.laotou99.abc4.servlet;
import javax.servlet.*;
import java.io.*;
import javax.servlet.http.*;
//javac -d ..\WEB-INF\classes GreetServlet2.java
public class GreetServlet2 extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
Cookie[] cookies=req.getCookies();
if(null!=cookies && cookies.length!=0)
{
String name = null;
String pwd = null;
for(int i=0;i<cookies.length;i++)
{
Cookie cookie=cookies[i];
String cName=cookie.getName();
if(cName.equals("userinfo"))
{
String cValue=cookie.getValue();
String[] userInfo=cValue.split("&");
for(int j=0;j<userInfo.length;j++)
{
String[] value=userInfo[j].split("-");
if(value[0].equals("username"))
{
name=value[1];
}
if(value[0].equals("password"))
{
pwd=value[1];
}
}
}
}
if("zhangsan".equals(name) &&"1234".equals(pwd))
{
resp.setContentType("text/html;charset=gb2312");
PrintWriter out = resp.getWriter();
out.println("<html>");
out.println("<meta http-equiv=\"Pragma\" content=\"no-cache\">");
out.println("<head><title>欢迎页面</title></head>");
out.println("<body>");
out.println(name+",欢迎你");
out.println("<a href=login2>重新登入</a>");
out.println("</body></html>");
out.println("");
out.println("");
out.close();
return;
}
}
RequestDispatcher rd=req.getRequestDispatcher("login2");
rd.forward(req,resp);
}
}//GreetServlet
package org.laotou99.abc4.servlet;
import javax.servlet.*;
import java.io.*;
import javax.servlet.http.*;
//javac -d ..\WEB-INF\classes GreetServlet.java
public class GreetServlet extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
HttpSession session = req.getSession();
String user = (String)session.getAttribute("user");
if(null==user)
{
resp.sendRedirect("login");
}
else
{
resp.setContentType("text/html;charset=gb2312");
PrintWriter out = resp.getWriter();
out.println("<htm><head><title>欢迎页面</title></head>");
out.println("<body>");
OutputSessionInfo.printSessionInfo(out,session);
out.println("<p>");
out.println("欢迎您 "+user+"<p>");
out.println("<a href=login>重新登入</a>");
out.println("<a href=logout>注销</a>");
out.println("</body></html>");
out.println("");
out.close();
}
}
}
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 
相关文章推荐
- J2EE Servlet 学习笔记5
- J2EE Servlet 学习笔记2
- J2EE Servlet 学习笔记3
- J2EE与中间件 学习笔记2 Web组件 Servlet过滤器 监听器
- J2EE学习笔记(五)之Servlet中的Filter过滤器
- 初学 j2ee servlet 学习笔记(1)
- J2EE与中间件 学习笔记1 JDBC Session Servlet
- servlet学习笔记一 J2EE概念
- 手动创建Servlet--J2EE学习笔记
- Servlet笔记一之J2EE基本学习路线
- 【J2EE核心开发学习笔记 005】Servlet开发
- J2EE Servlet 学习笔记
- Servlet 学习笔记3：HTTP请求头
- jsp学习笔记_jsp/servlet的生命周期
- Servlet知识详解（一）ServletContext对象 和 ServletConfig对象学习笔记
- J2EE学习笔记：第五天 EJB
- ArcIMS学习之 HTML Viewer定制笔记 续二（2.Servlet与请求响应过程）
- Java for Web学习笔记（五九）：Controller替代Servlet（1）请求匹配
- [Spring MVC]学习笔记－－基础Servlet
- 在servlet设置javabean（最近学习j2ee遇到这个问题，在百度上找到的很好的回答）