<%-- 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>