JavaWeb 后端 <十三> 之 监听器 JSTL国际化

1. 监听器

1.1   概述

　　监听器： 主要是用来监听特定对象的创建或销毁、属性的变化的！

是一个实现特定接口的普通java类！

　　对象：

自己创建自己用 (不用监听)

别人创建自己用 （需要监听）

　　Servlet中哪些对象需要监听？

request / session / servletContext

分别对应的是request监听器、session相关监听器、servletContext监听器

　　监听器(listener)

　　　　监听器接口：

　　　　一、监听对象创建/销毁的监听器接口

　　   Interface ServletRequestListener     监听request对象的创建或销毁

　　 Interface HttpSessionListener        监听session对象的创建或销毁

　　 Interface ServletContextListener     监听servletContext对象的创建或销毁

　　  　二、监听对象属性的变化

　　  Interface ServletRequestAttributeListener 监听request对象属性变化: 添加、移除、修改

　　  Interface HttpSessionAttributeListener    监听session对象属性变化: 添加、移除、修改

　  　　　Interface ServletContextAttributeListener  监听servletContext对象属性变化

　　    三、session相关监听器

　　Interface HttpSessionBindingListener   监听对象绑定到session上的事件

　　       Interface HttpSessionActivationListener(了解) 监听session序列化及反序列化的事件

1.1      生命周期监听器

声明周期监听器： 监听对象的创建、销毁的过程！

监听器开发步骤：

1. 写一个普通java类，实现相关接口；
2. 配置(web.xml)

　　A.    ServletRequestListener

　　　　监听request对象的创建或销毁。

　　　　代码：

/**
 *  监听request对象的创建或销毁
 */
public class MyRequestListener implements ServletRequestListener{
    // 对象销毁
    @Override
    public void requestDestroyed(ServletRequestEvent sre) {
        // 获取request中存放的数据
        Object obj = sre.getServletRequest().getAttribute("cn");
        System.out.println(obj);
        System.out.println("MyRequestListener.requestDestroyed()");
    }
    // 对象创建
    @Override
    public void requestInitialized(ServletRequestEvent sre) {
        System.out.println("MyRequestListener.requestInitialized()");
    }
}

Web.xml

<!-- 监听request对象创建、销毁 -->

    <listener>

        <listener-class>cn.itcast.a_life.MyRequestListener</listener-class>

    </listener>

B.   HttpSessionListener

监听session对象的创建或销毁。

C.    ServletContextListener

监听servletContext对象的创建或销毁。

1.2      属性监听器

监听:request/session/servletContext对象属性的变化！

ServletRequestAttributeListener

HttpSessionAttributeListener

ServletContextAttributeListener

public class MySessionAttrListener implements HttpSessionAttributeListener {
    // 属性添加
    @Override
    public void attributeAdded(HttpSessionBindingEvent se) {
        // 先获取session对象
        HttpSession session = se.getSession();
        // 获取添加的属性
        Object obj = session.getAttribute("userName");
        // 测试
        System.out.println("添加的属性：" + obj);
    }
    // 属性移除
    @Override
    public void attributeRemoved(HttpSessionBindingEvent se) {
        System.out.println("属性移除");
    }
    // 属性被替换
    @Override
    public void attributeReplaced(HttpSessionBindingEvent se) {
        // 获取sesison对象
        HttpSession session = se.getSession();

        // 获取替换前的值
        Object old = se.getValue();
        System.out.println("原来的值：" + old);

        // 获取新值
        Object obj_new = session.getAttribute("userName");
        System.out.println("新值：" + obj_new);
    }
}

<!-- 属性监听器 -->
    <listener>
        <listener-class>cn.itcast.b_attr.MySessionAttrListener</listener-class>
    </listener>

总结：先写类，实现接口；  再配置

1.4 其他监听器： session相关监听器

HttpSessionBindingListener

监听对象绑定/解除绑定到sesison上的事件!

步骤：

对象实现接口； 再把对象绑定/解除绑定到session上就会触发监听代码。

作用：

(上线提醒！)

/**
 * 监听此对象绑定到session上的过程，需要实现session特定接口
 */
public class Admin implements HttpSessionBindingListener {
   … 省略get/set
// 对象放入session
    @Override
    public void valueBound(HttpSessionBindingEvent event) {
        System.out.println("Admin对象已经放入session");
    }
    // 对象从session中移除
    @Override
    public void valueUnbound(HttpSessionBindingEvent event) {
        System.out.println("Admin对象从session中移除！");
    }
}

思考：

这个session监听器，和上面的声明周期、属性监听器区别？

--à 不用再web.xml配置

　　-à 因为监听的对象是自己创建的对象，不是服务器对象！

1.4     案例

需求：做一个在线列表提醒的功能!

用户--à 登陆

---à 显示登陆信息，列表展示。(list.jsp)

--à  显示在线用户列表        (list.jsp)

-à 列表点击进入“在线列表页面”   onlineuser.jsp

实现：

　　1. 先增加退出功能；  再把session活跃时间1min;
　　2. 写监听器，监听servletContext对象的创建： 初始化集合(onlineuserlist)
　　3. 登陆功能： 用户登陆时候，把数据保存到servletContext中
　　4. List.jsp  增加超链接， 点击时候提交直接跳转到online.jsp
　　5. 写监听器： 监听session销毁，把当前登陆用户从onlineuserlist移除！

2. 国际化

Javaweb增强：过滤器、监听器、国际化、文件上传下载、javaMail

l  国际化又简称为 i18n：internationalization  （18位）

国际化的人：

人，英语，汉语；  可以说这个人是国际化的人；

软件的国际化：

软件

中国： 显示中文，以及服务符合中国习惯的文本字符串！

1999-09-09

美国： 显示英文，以及服务符合他国习惯的文本字符串！

这种软件，就叫国际化的软件！

如何做到国际化的软件，要求：

1. 软件中存储特定的字符串
2. 知道浏览器当前使用哪种语言（Locale  ）

Locale  本地化

Java提供了一个本地化的对象！封装当前语言、国家、环境等特征！

public class App {
    @Test
    //1. 本地化对象:Locale
    // 封装语言、国家信息的对象，有java.util提供
    public void testLocale() throws Exception {
        // 模拟中国语言等环境
        //Locale locale = Locale.CHINA;
        Locale locale = Locale.getDefault();            // 当前系统默认的语言环境
        System.out.println(locale.getCountry());           // CN  国家的简称
        System.out.println(locale.getDisplayCountry()); // 国家名称
        System.out.println(locale.getLanguage());        // zh 语言简称

        // 模拟美国国家
        Locale l_us = Locale.US;
        System.out.println(l_us.getCountry());
        System.out.println(l_us.getDisplayCountry());
    }
}

国际化

静态数据国际化

网站中显示的固定文本的国际化： “用户名”“密码“

国际化的软件：

1. 存储所有国家显示的文本的字符串

a)         文件: properties

b)         命名：  基础名_语言简称_国家简称.properties

　　例如：  msg_zh_CN.properties     存储所有中文

　　    msg_en_US.properties    存储所有英文

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" 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" alt="" />

1. 程序中获取

ResourceBundle类，可以读取国际化的资源文件!

// 国际化 - 静态数据
    @Test
    public void testI18N() throws Exception {

        // 中文语言环境
        Locale locale = Locale.US;

        // 创建工具类对象ResourceBundle
        ResourceBundle bundle = ResourceBundle.getBundle("cn.itcast.f_i18n.msg", locale);
        // 根据key获取配置文件中的值
        System.out.println(bundle.getString("hello"));
        System.out.println(bundle.getString("username"));
        System.out.println(bundle.getString("pwd"));

    }

动态文本国际化

中文：1987-09-19   ￥1000

英文： Sep/09 1987  $100

l  数值，货币，时间，日期等数据由于可能在程序运行时动态产生，所以无法像文字一样简单地将它们从应用程序中分离出来，而是需要特殊处理。Java 中提供了解决这些问题的 API 类(位于 java.util 包和 java.text 包中)

// 国际化 - 动态文本 - 0. 概述
    @Test
    public void testI18N2() throws Exception {
        // 国际化货币
        NumberFormat.getCurrencyInstance();
        // 国际化数字
        NumberFormat.getNumberInstance();
        // 国际化百分比
        NumberFormat.getPercentInstance();
        // 国际化日期
        //DateFormat.getDateTimeInstance(dateStyle, timeStyle, aLocale)
    }

    // 国际化 - 动态文本 - 1. 国际化货币
    @Test
    public void testI18N3() throws Exception {
        // 模拟语言环境
        Locale locale = Locale.CHINA;
        // 数据准备
        double number = 100;
        // 工具类
        NumberFormat nf = NumberFormat.getCurrencyInstance(locale);
        // 国际化货币
        String m = nf.format(number);
        // 测试
        System.out.println(m);
    }

    //面试题：  代码计算：  $100 * 10
    @Test
    public void eg() throws Exception {
        String str = "$100";
        int num = 10;

        // 1. 分析str值是哪一国家的货币
        Locale us = Locale.US;
        // 2. 国际化工具类
        NumberFormat nf = NumberFormat.getCurrencyInstance(us);
        // 3. 解析str国币
        Number n = nf.parse(str);

        System.out.println(n.intValue() * num);
    }

    // 国际化 - 动态文本 - 2. 国际化数值
    @Test
    public void testI18N4() throws Exception {
        // 模拟语言环境
        Locale locale = Locale.CHINA;
        NumberFormat nf = NumberFormat.getNumberInstance(Locale.US);
        String str = nf.format(1000000000);
        System.out.println(str);
    }

    // 国际化 - 动态文本 - 3. 国际化日期
    /*
     * 日期
     *       FULL   2015年3月4日 星期三
     *       LONG   2015年3月4日
     *       FULL   2015年3月4日 星期三
     *    MEDIUM 2015-3-4
     *    SHORT  15-3-4
     *
     * 时间
     *       FULL   下午04时31分59秒 CST
     *       LONG   下午04时32分37秒
     *    MEDIUM 16:33:00
     *    SHORT  下午4:33
     *
     *
     */
    @Test
    public void testI18N5() throws Exception {

        // 日期格式
        int dateStyle = DateFormat.SHORT;
        // 时间格式
        int timeStyle = DateFormat.SHORT;

        // 工具类
        DateFormat df =
            DateFormat.getDateTimeInstance(dateStyle, timeStyle, Locale.CHINA);
        String date = df.format(new Date());

        System.out.println(date);
    }

    // 面试2： 请将时间值：09-11-28 上午10时25分39秒 CST，反向解析成一个date对象。
    @Test
    public void eg2() throws Exception {
        String str = "09-11-28 上午10时25分39秒 CST";
        // 创建DateFormat工具类，国际化日期
        DateFormat df = DateFormat.getDateTimeInstance(
                DateFormat.SHORT, DateFormat.FULL, Locale.getDefault());
        Date d = df.parse(str);

        System.out.println(d);
    }

Jsp页面国际化

<html>
  <head>
      <%
      ResourceBundle bundle = ResourceBundle.getBundle("cn.itcast.f_i18n.msg",request.getLocale());
      %>
    <title><%=bundle.getString("title") %></title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
  </head>

  <body>
  <form name="frmLogin" action="${pageContext.request.contextPath }/admin?method=login" method="post">
      <table align="center" border="1">
          <tr>
              <td><%=bundle.getString("username") %></td>
              <td>
                  <input type="text" name="userName">
              </td>
          </tr>
          <tr>
              <td><%=bundle.getString("pwd") %></td>
              <td>
                  <input type="password" name="pwd">
              </td>
          </tr>
          <tr>
              <td>
                  <input type="submit" value="<%=bundle.getString("submit") %>">
              </td>
          </tr>
      </table>
  </form>
  </body>
</html>

Jsp页面国际化 – 使用jstl标签

JSTL标签：

         核心标签库

         国际化与格式化标签库

数据库标签库(没用)

函数库

<fmt:setLocale value=""/>        设置本地化对象

<fmt:setBundle basename=""/>     设置工具类

<fmt:message></fmt:message>     显示国际化文本

格式化数值

<fmt:formatNumber pattern="#.##" value="100.99"></fmt:formatNumber>

格式化日期:

<fmt:formatDate pattern="yyyy-MM-dd" value="${date}"/>

<html>
  <head>
      <!-- 一、设置本地化对象 -->
      <fmt:setLocale value="${pageContext.request.locale}"/>
      <!-- 二、设置工具类 -->
      <fmt:setBundle basename="cn.itcast.f_i18n.msg" var="bundle"/>
    <title><fmt:message key="title" bundle="${bundle}"></fmt:message></title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
  </head>

  <body>
  <form name="frmLogin" action="${pageContext.request.contextPath }/admin?method=login" method="post">
      <table align="center" border="1">
          <tr>
              <td><fmt:message key="username" bundle="${bundle}"></fmt:message></td>
              <td>
                  <input type="text" name="userName">
              </td>
          </tr>
          <tr>
              <td><fmt:message key="pwd" bundle="${bundle}"></fmt:message></td>
              <td>
                  <input type="password" name="pwd">
              </td>
          </tr>
          <tr>
              <td>
                  <input type="submit" value="<fmt:message key="submit" bundle="${bundle}"/>">
              </td>
          </tr>
      </table>
  </form>
  </body>
</html>