學(xué)習(xí)筆記：

一、監(jiān)聽器Listener：

其實(shí)就是一個(gè)java類。

1、監(jiān)聽Session、request和application的創(chuàng)建和銷毀

HttpSessionListener,ServletContextListener,ServletRequestListener

2、監(jiān)聽對(duì)象屬性變化

HttpSessionAttributeListener,ServletContextAttributeListener,ServletRequestAttributeListener

3、監(jiān)聽Session內(nèi)的對(duì)象

HttpSessionBindingListener,HttpSessionActivationListener

監(jiān)聽器Listener跟js中的事件一樣：

項(xiàng)目一啟動(dòng)就要打印一句Hello world

方法一：使用loadonstartup servlet可以實(shí)現(xiàn)

方法二：使用Listener實(shí)現(xiàn)，當(dāng)項(xiàng)目啟動(dòng)時(shí)馬上運(yùn)行代碼

ServletContextListener用來(lái)監(jiān)控application對(duì)象的創(chuàng)建和銷毀的監(jiān)聽器

當(dāng)啟動(dòng)一個(gè)javaweb項(xiàng)目時(shí)，會(huì)創(chuàng)建唯一的一個(gè)application對(duì)象

servlet,filter和listener都需要在web.xml文件中進(jìn)行配置。

創(chuàng)建listener的步驟：

1、創(chuàng)建listener類

2、在web.xml文件中進(jìn)行配置

代碼緩存時(shí)可以使用監(jiān)聽器：ServletContextListener

統(tǒng)計(jì)本網(wǎng)頁(yè)的訪問次數(shù)。

統(tǒng)計(jì)在線人數(shù)。（必須使用HttpSessionListener，用來(lái)監(jiān)視session對(duì)象的創(chuàng)建和銷毀的）

"ServletRequestAttributeListener：當(dāng)調(diào)用request對(duì)象的setAttribute方法時(shí)，會(huì)

運(yùn)行這個(gè)監(jiān)聽器中的代碼"

角色和權(quán)限：

不同的角色登錄到系統(tǒng)中看到的內(nèi)容是不一樣的，這個(gè)就叫權(quán)限問題。

實(shí)際操作例子記錄：

創(chuàng)建Java Web和loadonstartup servlet的方法：

創(chuàng)建Java Web和Listener監(jiān)聽器的方法：

綜合效果的例子：

package com.jy.controller;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

?* Servlet implementation class TestServlet

?*/

@WebServlet("/ts")

public class TestServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

? ? ? ?

? ? /**

? ? ?* @see HttpServlet#HttpServlet()

? ? ?*/

? ? public TestServlet() {

? ? ? ? super();

? ? ? ? // TODO Auto-generated constructor stub

? ? }

/**

* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

*/

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub

this.doPost(request, response);

}

/**

* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

*/

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub

//往request對(duì)象中添加了一個(gè)act屬性

request.setAttribute("act", "admin");

request.setAttribute("pwd", 123);

//將request對(duì)象中的act屬性移除掉

//request.removeAttribute("act");

request.setAttribute("act", "Tom");

}

}

package com.jy.listener;

import javax.servlet.ServletContext;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

//專門用來(lái)監(jiān)視application對(duì)象的創(chuàng)建和銷毀的類

public class CtxListener implements ServletContextListener {

? ? //當(dāng)application對(duì)象被創(chuàng)建出來(lái)時(shí)調(diào)用的方法

@Override

public void contextInitialized(ServletContextEvent arg0) {

// TODO Auto-generated method stub

? ? ? ? //進(jìn)行代碼的緩存

String html = "<select><option>請(qǐng)選擇</option><option>高中</option><option>大專</option><option>本科</option></select>";

//獲取application對(duì)象

ServletContext application = arg0.getServletContext();

//將下拉框數(shù)據(jù)存到application對(duì)象中

application.setAttribute("edu", html);

String sex = "<input type='radio' name='sex' value='男' />男<input type='radio' name='sex' value='女' />女";

application.setAttribute("sex", sex);

}

? ? //當(dāng)application對(duì)象被銷毀時(shí)調(diào)用的方法

@Override

public void contextDestroyed(ServletContextEvent arg0) {

// TODO Auto-generated method stub

}

}

package com.jy.listener;

import javax.servlet.ServletRequestAttributeEvent;

import javax.servlet.ServletRequestAttributeListener;

public class ReqAttrListener implements ServletRequestAttributeListener {

? ? //當(dāng)往request對(duì)象中添加一個(gè)屬性時(shí)會(huì)執(zhí)行這個(gè)方法

@Override

public void attributeAdded(ServletRequestAttributeEvent arg0) {

// TODO Auto-generated method stub

//獲取修改的屬性的名字

String name = arg0.getName();

//獲取修改的屬性的具體的值

Object value = arg0.getValue();

? ? ? ? System.out.println("你往request對(duì)象中添加了一個(gè)屬性,屬性名是：" + name);

}

? ? //當(dāng)移除掉request對(duì)象中的一個(gè)屬性時(shí)會(huì)執(zhí)行這個(gè)方法

@Override

public void attributeRemoved(ServletRequestAttributeEvent arg0) {

// TODO Auto-generated method stub

? ? ? ? System.out.println("你移除掉了reuqest對(duì)象中的一個(gè)屬性");

}

? ? //當(dāng)替換掉request對(duì)象中的一個(gè)屬性時(shí)會(huì)執(zhí)行這個(gè)方法

@Override

public void attributeReplaced(ServletRequestAttributeEvent arg0) {

// TODO Auto-generated method stub

System.out.println("你替換掉了request對(duì)象中的一個(gè)屬性");

}

}

package com.jy.listener;

import javax.servlet.ServletContext;

import javax.servlet.http.HttpSessionEvent;

import javax.servlet.http.HttpSessionListener;

public class SsListener implements HttpSessionListener {

? ? //當(dāng)創(chuàng)建session對(duì)象時(shí)調(diào)用

@Override

public void sessionCreated(HttpSessionEvent arg0) {

// TODO Auto-generated method stub

? ? ? ? //System.out.println("有用戶上線啦");

? ? ? ? //設(shè)置session在多久以后會(huì)失效，也就是多久以后會(huì)被銷毀

? ? ? ? //設(shè)置3秒以后被銷毀掉

? ? ? ? arg0.getSession().setMaxInactiveInterval(3);

ServletContext application = arg0.getSession().getServletContext();

//嘗試從application對(duì)象中取出在線人數(shù)

Object objTotal = application.getAttribute("total");

if(objTotal == null) {//第一個(gè)上線的用戶

application.setAttribute("total", 1);

}else {

Integer total = Integer.parseInt(objTotal.toString());

total ++;

application.setAttribute("total", total);

}

}

? ? //當(dāng)銷毀session對(duì)象時(shí)調(diào)用

@Override

public void sessionDestroyed(HttpSessionEvent arg0) {

// TODO Auto-generated method stub

? ? ? ? //System.out.println("這個(gè)用戶下線啦");

ServletContext application = arg0.getSession().getServletContext();

Object objTotal = application.getAttribute("total");

if(objTotal != null) {

Integer total = Integer.parseInt(objTotal.toString());

total --;

application.setAttribute("total", total);

}

}

}

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

? <display-name>listenerJavaWeb</display-name>

? <listener>

? ? <listener-class>com.jy.listener.CtxListener</listener-class>

? </listener>

? <listener>

? ? <listener-class>com.jy.listener.SsListener</listener-class>

? </listener>

? <listener>

? ? <listener-class>com.jy.listener.ReqAttrListener</listener-class>

? </listener>

? <welcome-file-list>

? ? <welcome-file>index.html</welcome-file>

? ? <welcome-file>index.htm</welcome-file>

? ? <welcome-file>index.jsp</welcome-file>

? ? <welcome-file>default.html</welcome-file>

? ? <welcome-file>default.htm</welcome-file>

? ? <welcome-file>default.jsp</welcome-file>

? </welcome-file-list>

</web-app>

<%@ page language="java" contentType="text/html;?

charset=UTF-8" pageEncoding="UTF-8"%>

<%

? ? String path = request.getContextPath();

? ? String basePath = request.getScheme()+"://"

? ? +request.getServerName()+":"+request.getServerPort()+path+"/";

? ??

? ? //嘗試從application中獲取訪問次數(shù)

? ? Object objCt = application.getAttribute("ct");

? ? if(objCt == null) {//第一次訪問本頁(yè)面

? ? application.setAttribute("ct", 1);

? ? }else {

? ? Integer count = Integer.parseInt(objCt.toString());

? ? count ++;

? ? application.setAttribute("ct", count);

? ? }

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

? ? <head>

? ? ? ? <base hreff="<%=basePath%>">

? ? ? ? <title></title>

? ? ? ? <meta http-equiv="pragma" content="no-cache">

? ? ? ? <meta http-equiv="cache-control" content="no-cache">

? ? ? ? <meta http-equiv="expires" content="0">

? ? ? ? <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

? ? ? ? <meta http-equiv="description" content="This is my page">

? ? </head>

? ? <body>

? ? ? ? <h1>首頁(yè),訪問次數(shù)：${ct }</h1>

? ? ? ? ${edu }

? ? ? ? ${sex }

? ? ? ? <h1>當(dāng)前在線人數(shù)：${total }</h1>

? ? </body>

</html>

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

<%

? ? String path = request.getContextPath();

? ? String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

? ? <head>

? ? ? ? <base hreff="<%=basePath%>">

? ? ? ? <title></title>

? ? ? ? <meta http-equiv="pragma" content="no-cache">

? ? ? ? <meta http-equiv="cache-control" content="no-cache">

? ? ? ? <meta http-equiv="expires" content="0">

? ? ? ? <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

? ? ? ? <meta http-equiv="description" content="This is my page">

? ? </head>

? ? <body>

? ? ? ? <h1>登錄頁(yè)面</h1>

? ? ? ? ${edu }

? ? </body>

</html>

作業(yè)：

1、通過監(jiān)聽器實(shí)現(xiàn)在線人數(shù)統(tǒng)計(jì)。

package com.SSHC.listener;

import javax.servlet.ServletContext;

import javax.servlet.http.HttpSessionEvent;

import javax.servlet.http.HttpSessionListener;

public class OnlineListener implements HttpSessionListener {

@Override

public void sessionCreated(HttpSessionEvent arg0) {

? ? ? ? arg0.getSession().setMaxInactiveInterval(3);

ServletContext application =?

arg0.getSession().getServletContext();

Object objTotal = application.getAttribute("total");

if(objTotal == null) {

application.setAttribute("total", 1);

}else {

Integer total = Integer.parseInt(objTotal.toString());

total ++;

application.setAttribute("total", total);

}

}

@Override

public void sessionDestroyed(HttpSessionEvent arg0) {

ServletContext application =?

arg0.getSession().getServletContext();

Object objTotal = application.getAttribute("total");

if(objTotal != null) {

Integer total = Integer.parseInt(objTotal.toString());

total --;

application.setAttribute("total", total);

}

}

}

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

? <display-name>JavaWebListener</display-name>

? <listener>

? ? <listener-class>com.SSHC.listener.OnlineListener</listener-class>

? </listener>

? <welcome-file-list>

? ? <welcome-file>index.html</welcome-file>

? ? <welcome-file>index.htm</welcome-file>

? ? <welcome-file>index.jsp</welcome-file>

? ? <welcome-file>default.html</welcome-file>

? ? <welcome-file>default.htm</welcome-file>

? ? <welcome-file>default.jsp</welcome-file>

? </welcome-file-list>

</web-app>

<%@ page language="java" contentType="text/html;?

charset=UTF-8" pageEncoding="UTF-8"%>

<%

? ? String path = request.getContextPath();

? ? String basePath = request.getScheme()+"://"

? ? +request.getServerName()+":"+request.getServerPort()+path+"/";

? ??

? ? //嘗試從application中獲取訪問次數(shù)

? ? Object objCt = application.getAttribute("ct");

? ? if(objCt == null) {//第一次訪問本頁(yè)面

? ? application.setAttribute("ct", 1);

? ? }else {

? ? Integer count = Integer.parseInt(objCt.toString());

? ? count ++;

? ? application.setAttribute("ct", count);

? ? }

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

? ? <head>

? ? ? ? <base hreff="<%=basePath%>">

? ? ? ? <title></title>

? ? ? ? <meta http-equiv="pragma" content="no-cache">

? ? ? ? <meta http-equiv="cache-control" content="no-cache">

? ? ? ? <meta http-equiv="expires" content="0">

? ? ? ? <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

? ? ? ? <meta http-equiv="description" content="This is my page">

? ? </head>

? ? <body>

? ? ? ? <h1>詩(shī)書畫唱提醒你！</h1>

? ? ??

? ? ? ? <h1>當(dāng)前在線人數(shù)：${total }</h1>

? ? </body>

</html>

2、在項(xiàng)目啟動(dòng)時(shí)將下拉框中的數(shù)據(jù)緩存起來(lái)，必須連接數(shù)據(jù)庫(kù)，在不同的jsp頁(yè)面創(chuàng)建下拉框載入緩存數(shù)據(jù)。

create table studentInfo(

sid int primary key auto_increment,

sname varchar(100) not null,

sgender varchar(100)? default '男' not null,

sage int not null,

saddress varchar(100) ,

semail? varchar(100) );

insert into? studentInfo(

sname ,

sgender ,

sage ,

saddress ,

semail?

) values ("詩(shī)書畫唱1",'男','19','北京市朝陽(yáng)區(qū)','SSHC1@163. com'),

("詩(shī)書畫唱2",'男','20','北京市朝陽(yáng)區(qū)','SSHC2@163. com'),

("詩(shī)書畫唱3",'男','30','北京市朝陽(yáng)區(qū)','SSHC3@163. com');

--drop table studentDB

--select * from studentDB

package bean;

public class studentInfo {

? ? private Integer? ?sid ;

? ? private? String? sname;

? ? private? String? ? sgender ;

? ? private Integer? ?sage ;

? ? private? String saddress;

? ? private? String? semail;

public Integer getSid() {

return sid;

}

public void setSid(Integer sid) {

this.sid = sid;

}

public String getSname() {

return sname;

}

public void setSname(String sname) {

this.sname = sname;

}

public String getSgender() {

return sgender;

}

public void setSgender(String sgender) {

this.sgender = sgender;

}

public Integer getSage() {

return sage;

}

public void setSage(Integer sage) {

this.sage = sage;

}

public String getSaddress() {

return saddress;

}

public void setSaddress(String saddress) {

this.saddress = saddress;

}

public String getSemail() {

return semail;

}

public void setSemail(String semail) {

this.semail = semail;

}

? ?

}

package com.SSHC.controller;

import java.io.IOException;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import bean.studentInfo;

import DAO.Dao;

@WebServlet("/FirstPageServletStart")

public class FirstPageServletStart extends HttpServlet {

private static final long serialVersionUID = 1L;

??

? ? public FirstPageServletStart() {

? ? ? ? super();

? ? ? ? // TODO Auto-generated constructor stub

? ? }

/**

* @see HttpServlet#doGet(HttpServletRequest request,

*? HttpServletResponse response)

*/

protected void doGet(HttpServletRequest request,?

HttpServletResponse response)?

throws ServletException, IOException {

// TODO Auto-generated method stub

this.doPost(request, response);

}

protected void doPost(HttpServletRequest request,

HttpServletResponse response)?

throws ServletException, IOException {

Dao gd = new Dao();

List<studentInfo>list = gd.selectAll();

StringBuilder html = new StringBuilder();

boolean panDuan=true;

//奇數(shù)行為class='false'

for(studentInfo g : list) {

Integer Sid= g.getSid();

String Sname= g.getSname();

String Saddress= g.getSaddress();

String Sgender= g.getSgender();

String Semail= g.getSemail();

Integer Sage= g.getSage();

panDuan=!panDuan;

html.append("<tr class='"+panDuan+"'>");

html.append("<td ><a href='IDSelectServlet?Osid="

+Sid+"'>"?

+ Sid + "</a></td>");

? html.append("<td >" + Sname + "</td>");

html.append("<td >" + Sgender+ "</td>");

?html.append("<td>" + Sage + "</td>");

html.append("<td >" +Saddress + "</td>");

html.append("<td >" + Semail + "</td>");

? ? ? ? html.append("</tr>");

}

request.setAttribute("html", html);

request.getRequestDispatcher("firstPage.jsp")

? ? .forward(request, response);

}

}

package com.SSHC.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;

import javax.servlet.annotation.WebFilter;

@WebFilter("/*")

public class CodeFilter implements Filter {

? ?

? ? public CodeFilter() {

? ? ? ? // TODO Auto-generated constructor stub

? ? }

public void destroy() {

// TODO Auto-generated method stub

}

public void doFilter(ServletRequest request,?

ServletResponse response, FilterChain chain)

throws IOException, ServletException {

// TODO Auto-generated method stub

// place your code here

request.setCharacterEncoding("utf-8");

chain.doFilter(request, response);

}

public void init(FilterConfig fConfig) throws ServletException {

// TODO Auto-generated method stub

}

}

package com.SSHC.listener;

import java.util.List;

import javax.servlet.ServletContext;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

import DAO.Dao;

import bean.studentInfo;

public class huanCunListener implements ServletContextListener {

@Override

public void contextInitialized(ServletContextEvent arg0) {

Dao gd = new Dao();

List<studentInfo>list = gd.selectAll();

StringBuilder html = new StringBuilder();

html.append("<select><option>請(qǐng)選擇</option>");

boolean panDuan=true;

//奇數(shù)行為class='false'

for(studentInfo g : list) {

String Sname= g.getSname();

html.append("<option>"+Sname+"</option>"

);

}

html.append("</select>");

ServletContext application = arg0.getServletContext();

System.out.println(html);

application.setAttribute("XLK", html);

}

@Override

public void contextDestroyed(ServletContextEvent arg0) {

// TODO Auto-generated method stub

}

}

package DAO;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

import utils.DBUtils;

import bean.studentInfo;

public class Dao {

public List<studentInfo>selectAll(){

String sql = "select * from studentInfo";

Connection conn = null;

PreparedStatement pstm = null;

ResultSet rs = null;

List<studentInfo>list = new ArrayList<studentInfo>();

try {

conn = DBUtils.getConn();

pstm = conn.prepareStatement(sql);

rs = pstm.executeQuery();

while(rs.next()) {

Integer sid = rs.getInt("sid");

String Saddress = rs.getString("Saddress");

String Sname = rs.getString("Sname");

String Sgender= rs.getString("Sgender");

String semail = rs.getString("semail");

Integer sage = rs.getInt("sage");

studentInfo g = new studentInfo();

g.setSid(sid);

g.setSage(sage);

g.setSgender(Sgender);

g.setSemail(semail);

g.setSname(Sname);

g.setSaddress(Saddress);

list.add(g);

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return list;

}

?

}

package utils;

import java.io.IOException;

import java.io.InputStream;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.util.Properties;

public class DBUtils {

? ? private static String driverName;

? ? private static String url;

? ? private static String userName;

? ? private static String pwd;

? ? //靜態(tài)塊，隨著類加載而運(yùn)行的

? ? static{

? ? //讀取db.properties文件中的內(nèi)容：

? ? Properties prop = new Properties();

? ? InputStream is = DBUtils.class.getClassLoader()

? ? .getResourceAsStream("db.properties");

? ? try {

prop.load(is);

driverName = prop.getProperty("dn");

url = prop.getProperty("url");

userName = prop.getProperty("un");

pwd = prop.getProperty("up");

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

? ? }

? ??

? ? public static Connection getConn(){

? ? Connection conn = null;

? ? try {

Class.forName(driverName);

conn = DriverManager.getConnection(url,userName,pwd);

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

? ? return conn;

? ? }

? ??

? ? public static void close(ResultSet rs,

? ? PreparedStatement pstm

? ? ,Connection conn){

? ? try {

? ? if(rs != null) {

? ? rs.close();

? ? }

? ? if(pstm != null) {

? ? pstm.close();

? ? }

? ? if(conn != null) {

? ? conn.close();

? ? }

? ? } catch(Exception e) {

? ? e.printStackTrace();

? ? }

? ? }

}

dn=com.mysql.jdbc.Driver

url=jdbc:mysql://localhost:3306/studentdb?useUnicode=true&characterEncoding=UTF-8

un=root

up=root

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"?

xmlns="http://java.sun.com/xml/ns/javaee"?

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee?

http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"?

id="WebApp_ID" version="3.0">

? <display-name>JavaWebListener</display-name>

? <listener>

? ? <listener-class>com.SSHC.listener.OnlineListener</listener-class>

? </listener>

? <listener>

? ? <listener-class>com.SSHC.listener.huanCunListener</listener-class>

? </listener>

? <welcome-file-list>

? ? <welcome-file>index.html</welcome-file>

? ? <welcome-file>index.htm</welcome-file>

? ? <welcome-file>index.jsp</welcome-file>

? ? <welcome-file>default.html</welcome-file>

? ? <welcome-file>default.htm</welcome-file>

? ? <welcome-file>default.jsp</welcome-file>

? </welcome-file-list>

</web-app>

<%@ page language="java" contentType="text/html; charset=UTF-8"

? ? pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>詩(shī)書畫唱</title>

</head>

<body>

${XLK}

</body>

</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"

? ? pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>詩(shī)書畫唱</title>

</head>

<body>

${XLK}

</body>

</html>