2011级-csdn-java-张侃— Servlet监听器在开发中的应用案例
2012-12-05 19:16
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案例：显示登陆用户列表，并实现踢人功能。
登陆的jsp页面------------------------
处理登陆请求的servlet---------------------------
显示登陆成功与否的jsp页面------------------
显示用户列表的jsp页面-----------------
处理踢人请求的servlet-----------------------------
servlet监听器-------------
实体类------------------------
处理乱码的过滤器----------------
配置文件----------
项目所导的包------------
登陆的jsp页面------------------------
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'login.jsp' starting page</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/LoginServlet" method="post">
用户名：
<input type="text" name="username"><br>
密 码：
<input type="text" name="password"><br>
<input type="submit" value="登陆">
</form>
</body>
</html>处理登陆请求的servlet---------------------------
package com.hbsi.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.hbsi.domain.User;
public class LoginServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username=request.getParameter("username");
String password=request.getParameter("password");
User user=new User();
user.setUsername(username);
user.setPassword(password);
request.getSession().setAttribute("user",user);
response.sendRedirect("/ListenerKicking/index.jsp");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}显示登陆成功与否的jsp页面------------------
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
欢迎您：${user.username} <br>
</body>
</html>显示用户列表的jsp页面-----------------
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'userJsp.jsp' starting page</title>
</head>
<body>
当前在线用户为：
<br />
<c:forEach items="${map}" var="me">
<c:url value="/KickUserServlet" var="url">
<c:param name="username" value="${me.key}"></c:param>
</c:url>
${me.key}<a href="${url}">剔出去</a>
<br />
</c:forEach>
</body>
</html>处理踢人请求的servlet-----------------------------
package com.hbsi.servlet;
import java.io.IOException;
import java.util.Map;
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 KickUserServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username=request.getParameter("username");
username=new String(username.getBytes("iso8859-1"),"Utf-8");
Map map=(Map) this.getServletContext().getAttribute("map");
HttpSession session=(HttpSession) map.get(username);
if(session!=null){
session.invalidate();
map.remove(username);
}
request.getRequestDispatcher("/userJsp.jsp").forward(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}servlet监听器-------------
package com.hbsi.listener;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;
import com.hbsi.domain.User;
public class SessionListener implements HttpSessionAttributeListener {
@Override
public void attributeAdded(HttpSessionBindingEvent se) {
Object obj=se.getValue();
if(obj instanceof User){
User user=(User) obj;
HttpSession session=se.getSession();
Map map=(Map) session.getServletContext().getAttribute("map");
if(map==null){
map=new HashMap();
session.getServletContext().setAttribute("map",map);
}
map.put(user.getUsername(),session);
}
}
@Override
public void attributeRemoved(HttpSessionBindingEvent se) {
}
@Override
public void attributeReplaced(HttpSessionBindingEvent se) {
// TODO Auto-generated method stub
}
}实体类------------------------
package com.hbsi.domain;
public class User {
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}处理乱码的过滤器----------------
package com.hbsi.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
public class CharseterEncodingFilter implements Filter {
private FilterConfig config = null;
private String defaultCharset = "UTF-8";
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
String charset = config.getInitParameter("charset");
if(charset==null){
charset = defaultCharset;
}
request.setCharacterEncoding(charset);
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset="+charset);
chain.doFilter(request, response);
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
this.config = filterConfig;
}
}
配置文件----------
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <filter> <filter-name>CharseterEncodingFilter</filter-name> <filter-class>com.hbsi.filter.CharseterEncodingFilter</filter-class> <init-param> <param-name>charset</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>CharseterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <listener> <listener-class>com.hbsi.listener.SessionListener</listener-class> </listener> <servlet> <servlet-name>LoginServlet</servlet-name> <servlet-class>com.hbsi.servlet.LoginServlet</servlet-class> </servlet> <servlet> <servlet-name>KickUserServlet</servlet-name> <servlet-class>com.hbsi.servlet.KickUserServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>LoginServlet</servlet-name> <url-pattern>/LoginServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>KickUserServlet</servlet-name> <url-pattern>/KickUserServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
项目所导的包------------
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