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吴裕雄--天生自然轻量级JAVA EE企业应用开发Struts2Sping4Hibernate整合开发学习笔记：JSP脚本的9个内置对象（1）

分类: IT文章 • 2022-03-21 19:46:39

吴裕雄--天生自然轻量级JAVA EE企业应用开发Struts2Sping4Hibernate整合开发学习笔记：JSP脚本的9个内置对象（1）

<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> 增加Cookie </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<%
// 获取请求参数
String name = request.getParameter("name");
// 以获取到的请求参数为值，创建一个Cookie对象
Cookie c = new Cookie("username" , name);
// 设置Cookie对象的生存期限
c.setMaxAge(24 * 3600);
// 向客户端增加Cookie对象
response.addCookie(c);
%>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> 中文Cookie </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<%
// 以编码后的字符串为值，创建一个Cookie对象
Cookie c = new Cookie("cnName" 
    , java.net.URLEncoder.encode("孙悟空" , "gbk"));
// 设置Cookie对象的生存期限
c.setMaxAge(24 * 3600);
// 向客户端增加Cookie对象
response.addCookie(c);

// 获取本站在客户端上保留的所有Cookie
Cookie[] cookies = request.getCookies();
// 遍历客户端上的每个Cookie
for (Cookie cookie : cookies)
{
    // 如果Cookie的名为username，表明该Cookie是需要访问的Cookie
    if(cookie.getName().equals("cnName"))
    {
        //使用java.util.URLDecoder对Cookie值进行解码
        out.println(java.net.URLDecoder
            .decode(cookie.getValue()));
    }
}
%>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>测试config内置对象</title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<!-- 直接输出config的getServletName的值 -->
<%=config.getServletName()%>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>测试config内置对象</title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<!-- 输出该JSP名为name的配置参数 -->
name配置参数的值:<%=config.getInitParameter("name")%><br/>
<!-- 输出该JSP名为age的配置参数 -->
age配置参数的值:<%=config.getInitParameter("age")%>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> 取钱的表单页 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<!-- 取钱的表单 -->
<form method="post" action="first.jsp">
    取钱：<input type="text" name="balance">
    <input type="submit" value="提交">
</form>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" isErrorPage="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> 异常处理页面 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
异常类型是:<%=exception.getClass()%><br/>
异常信息是:<%=exception.getMessage()%><br/>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<%@ page import="java.util.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> request处理 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<%
// 获取请求的钱数
String bal = request.getParameter("balance");
// 将钱数的字符串转换成双精度浮点数
double qian = Double.parseDouble(bal);
// 对取出的钱进行判断
if (qian < 500)
{
    out.println("给你" + qian + "块");
    out.println("账户减少" + qian);
}
else
{
    // 创建了一个List对象
    List<String> info = new ArrayList<String>();
    info.add("1111111");
    info.add("2222222");
    info.add("3333333");
    // 将info对象放入request范围内
    request.setAttribute("info" , info);
%>
<!-- 实现转发 -->
<jsp:forward page="second.jsp"/>
<%}%>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCtype html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> 收集参数的表单页 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<form id="form1" action="request1.jsp">
用户名：<br/>
<input type="text" name="name"><hr/>
性别：<br/>
男：<input type="radio" name="gender" value="男">
女：<input type="radio" name="gender" value="女"><hr/>
喜欢的颜色：<br/>
红：<input type="checkbox" name="color" value="红">
绿：<input type="checkbox" name="color" value="绿">
蓝：<input type="checkbox" name="color" value="蓝"><hr/>
来自的国家：<br/>
<select name="country">
    <option value="中国">中国</option>
    <option value="美国">美国</option>
    <option value="俄罗斯">俄罗斯</option>
</select><hr/>
<input type="submit" value="提交">
<input type="reset" value="重置">
</form>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>application测试</title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<!-- 直接输出application 变量值 -->
<%=application.getAttribute("counter")%>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<%@ page import="java.sql.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>application测试</title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<%
//从配置参数中获取驱动
String driver = application.getInitParameter("driver");
//从配置参数中获取数据库url
String url = application.getInitParameter("url");
//从配置参数中获取用户名
String user = application.getInitParameter("user");
//从配置参数中获取密码
String pass = application.getInitParameter("pass");
//注册驱动
Class.forName(driver);
//获取数据库连接
Connection conn = DriverManager.getConnection(url,user,pass);
//创建Statement对象
Statement stmt = conn.createStatement();
//执行查询
ResultSet rs = stmt.executeQuery("select * from news_inf");
%>
<table bgcolor="#9999dd" border="1" width="480">
<%
//遍历结果集
while(rs.next())
{
%>
    <tr>
        <td><%=rs.getString(1)%></td>
        <td><%=rs.getString(2)%></td>
    </tr>
<%
}
%>
<table>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%-- 通过contentType属性指定响应数据是图片 --%>
<%@ page contentType="image/png" language="java"%>
<%@ page import="java.awt.image.*,javax.imageio.*,java.io.*,java.awt.*"%>
<%
// 创建BufferedImage对象
BufferedImage image = new BufferedImage(340 , 
    160, BufferedImage.TYPE_INT_RGB);
// 以Image对象获取Graphics对象
Graphics g = image.getGraphics();
// 使用Graphics画图，所画的图像将会出现在image对象中
g.fillRect(0,0,400,400);
// 设置颜色：红
g.setColor(new Color(255,0,0));
// 画出一段弧
g.fillArc(20, 20, 100,100, 30, 120);
// 设置颜色：绿
g.setColor(new Color(0 , 255, 0));
// 画出一段弧
g.fillArc(20, 20, 100,100, 150, 120);
// 设置颜色：蓝
g.setColor(new Color(0 , 0, 255));
// 画出一段弧
g.fillArc(20, 20, 100,100, 270, 120);
// 设置颜色：黑
g.setColor(new Color(0,0,0));
g.setFont(new Font("Arial Black", Font.PLAIN, 16));
// 画出三个字符串
g.drawString("red:climb" , 200 , 60);
g.drawString("green:swim" , 200 , 100);
g.drawString("blue:jump" , 200 , 140);
g.dispose();
// 将图像输出到页面的响应
ImageIO.write(image , "png" , response.getOutputStream());
%>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<%@ page import="java.sql.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> out测试 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<%
// 注册数据库驱动
Class.forName("com.mysql.jdbc.Driver");
// 获取数据库连接
Connection conn = DriverManager.getConnection(
    "jdbc:mysql://localhost:3306/javaee","root","32147");
// 创建Statement对象
Statement stmt = conn.createStatement();
// 执行查询，获取ResultSet对象
ResultSet rs = stmt.executeQuery("select * from news_inf");
%>
<table bgcolor="#9999dd" border="1" width="400">
<%
// 遍历结果集
while(rs.next())
{
    // 输出表格行
    out.println("<tr>");
    // 输出表格列
    out.println("<td>");
    // 输出结果集的第二列的值
    out.println(rs.getString(1));
    // 关闭表格列
    out.println("</td>");
    // 开始表格列
    out.println("<td>");
    // 输出结果集的第三列的值
    out.println(rs.getString(2));
    // 关闭表格列
    out.println("</td>");
    // 关闭表格行
    out.println("</tr>");
}
%>
<table>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> pageContext测试 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<%
// 使用pageContext设置属性，该属性默认在page范围内
pageContext.setAttribute("page","hello");
// 使用request设置属性，该属性默认在request范围内
request.setAttribute("request","hello");
// 使用pageContext将属性设置在request范围中
pageContext.setAttribute("request2","hello" 
    , pageContext.REQUEST_SCOPE);
// 使用session将属性设置在session范围中
session.setAttribute("session","hello");
// 使用pageContext将属性设置在session范围中
pageContext.setAttribute("session2","hello" 
    , pageContext.SESSION_SCOPE);
// 使用application将属性设置在application范围中
application.setAttribute("app","hello");
// 使用pageContext将属性设置在application范围中
pageContext.setAttribute("app2","hello" 
    , pageContext.APPLICATION_SCOPE);
//下面获取各属性所在的范围：
out.println("page变量所在范围：" + 
    pageContext.getAttributesScope("page") + "<br/>");
out.println("request变量所在范围：" +
    pageContext.getAttributesScope("request") + "<br/>");
out.println("request2变量所在范围："+
    pageContext.getAttributesScope("request2") + "<br/>");
out.println("session变量所在范围：" +
    pageContext.getAttributesScope("session") + "<br/>");
out.println("session2变量所在范围：" +
    pageContext.getAttributesScope("session2") + "<br/>");
out.println("app变量所在范围：" +
    pageContext.getAttributesScope("app") + "<br/>");
out.println("app2变量所在范围：" + 
    pageContext.getAttributesScope("app2") + "<br/>");
%>
</body>
</html>
<%@ page contentType="text/html; charset=gb2312" language="java" %>
<%@ page import="java.util.*"%>
<%
//取出session范围的itemMap属性
Map<String,Integer> itemMap = (Map<String,Integer>)session
    .getAttribute("itemMap");
//如果Map对象为空，则初始化Map对象
if (itemMap == null)
{
    itemMap = new HashMap<String,Integer>();
    itemMap.put("书籍" , 0);
    itemMap.put("电脑" , 0);
    itemMap.put("汽车" , 0);
}
//获取上个页面的请求参数
String[] buys = request.getParameterValues("item");
//遍历数组的各元素
for (String item : buys)
{
    //如果item为book，表示选择购买书籍
    if(item.equals("book"))
    {
        int num1 = itemMap.get("书籍").intValue();
        //将书籍key对应的数量加1
        itemMap.put("书籍" , num1 + 1);
    }
    //如果item为computer，表示选择购买电脑
    else if (item.equals("computer"))
    {
        int num2 = itemMap.get("电脑").intValue();
        //将电脑key对应的数量加1
        itemMap.put("电脑" , num2 + 1);
    }
    //如果item为car，表示选择购买汽车
    else if (item.equals("car"))
    {
        int num3 = itemMap.get("汽车").intValue();
        //将汽车key对应的数量加1
        itemMap.put("汽车" , num3 + 1);
    }
}
//将itemMap对象放到设置成session范围的itemMap属性
session.setAttribute("itemMap" , itemMap);
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> 购买的物品列表 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
您所购买的物品：<br/>
书籍：<%=itemMap.get("书籍")%>本<br/>
电脑：<%=itemMap.get("电脑")%>台<br/>
汽车：<%=itemMap.get("汽车")%>辆
<p><a href="shop.jsp">再次购买</a></p>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>application测试</title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<!-- JSP声明 -->
<%!
int i;
%>
<!-- 将i值自加后放入application的变量内 -->
<%
application.setAttribute("counter",String.valueOf(++i));
%>
<!-- 输出i值 -->
<%=i%>
</body>
</html>

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