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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（2）

分类: IT文章 • 2022-03-21 19:47:03

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（2）

<%--
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> 读取Cookie </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<%
// 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 c : cookies)
{
    // 如果Cookie的名为username，表明该Cookie是需要访问的Cookie
    if(c.getName().equals("username"))
    {
        out.println(c.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> redirect目标页 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<h3>被重定向的目标页</h3>
name请求参数的值：<%=request.getParameter("name")%>
</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> 获取请求头/请求参数 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<%
// 获取所有请求头的名称
Enumeration<String> headerNames = request.getHeaderNames();
while(headerNames.hasMoreElements())
{
    String headerName = headerNames.nextElement();
    // 获取每个请求、及其对应的值
    out.println(
        headerName + "-->" + request.getHeader(headerName) + "<br/>");
}
out.println("<hr/>");
// 设置解码方式，对于简体中文，使用GBK解码
request.setCharacterEncoding("GBK");   // ①
// 下面依次获取表单域的值
String name = request.getParameter("name");
String gender = request.getParameter("gender");
// 如果某个请求参数有多个值，将使用该方法获取多个值
String[] color = request.getParameterValues("color");
String national = request.getParameter("country");
%>
<!-- 下面依次输出表单域的值 -->
您的名字：<%=name%><hr/>
您的性别：<%=gender%><hr/>
<!-- 输出复选框获取的数组值 -->
您喜欢的颜色：<%for(String c : color)
{out.println(c + " ");}%><hr/>
您来自的国家：<%=national%><hr/>
</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> 获取GET请求参数 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<%
// 获取name请求参数的值
String name = request.getParameter("name");
// 获取gender请求参数的值
String gender = request.getParameter("gender");
%>
<!-- 输出name变量值 -->
您的名字：<%=name%><hr/>
<!-- 输出gender变量值 -->
您的性别：<%=gender%><hr/>
</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> 获取包含非西欧字符的GET请求参数 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<%
// 获取请求里包含的查询字符串
String rawQueryStr = request.getQueryString();
out.println("原始查询字符串为：" + rawQueryStr + "<hr/>");
// 使用URLDecoder解码字符串
String queryStr = java.net.URLDecoder.decode(
    rawQueryStr , "UTF-8");
out.println("解码后的查询字符串为：" + queryStr + "<hr/>");
// 以&符号分解查询字符串
String[] paramPairs = queryStr.split("&");
for(String paramPair : paramPairs)
{
    out.println("每个请求参数名、值对为：" + paramPair + "<br/>");
    // 以=来分解请求参数名和值
    String[] nameValue = paramPair.split("=");
    out.println(nameValue[0] + "参数的值是：" + 
        nameValue[1]+ "<hr/>");
}
%>
</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>
<%
// 取出请求参数
String bal = request.getParameter("balance");
double qian = Double.parseDouble(bal);
// 取出request范围内的info属性
List<String> info  = (List<String>)request.getAttribute("info");
for (String tmp : info)
{
    out.println(tmp + "<br/>");
}
out.println("取钱" + qian + "块");
out.println("账户减少" + qian);
%>
</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> 选择物品购买 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<form method="post" action="processBuy.jsp">
    书籍：<input type="checkbox" name="item" value="book"/><br/>
    电脑：<input type="checkbox" name="item" value="computer"/><br/>
    汽车：<input type="checkbox" name="item" value="car"/><br/>
    <input type="submit" value="购买"/>
</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: 
--%>
<!-- 通过errorPage属性指定异常处理页面 -->
<%@ page contentType="text/html; charset=GBK" language="java" errorPage="error.jsp" %>
<!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> JSP脚本的异常机制 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<%
int a = 6;
int c = a / 0;
%>
</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="" %>
<%
// 生成页面响应
out.println("====");
// 重定向到redirect-result.jsp页面
response.sendRedirect("redirect-result.jsp");
%>
<?xml version="1.0" encoding="GBK"?>
<!-- 定义生成文件的project根元素，默认的target为空 -->
<project name="web" basedir="." default="">
    <!-- 定义三个简单属性 -->
    <property name="src" value="src"/>
    <property name="classes" value="classes"/>
    <!-- 定义一组文件和目录集 -->
    <path id="classpath">
        <fileset dir="lib">
            <include name="*.jar"/>
        </fileset>
        <pathelement path="${classes}"/>
    </path>
    <!-- 定义compile target，用于编译Java源文件 -->
    <target name="compile" description="编译Java源文件">
        <!-- 先删除classes属性所代表的文件夹 -->
        <delete dir="${classes}"/>
        <!-- 创建classes属性所代表的文件夹 -->
        <mkdir dir="${classes}"/>
        <!-- 编译Java文件，编译后的class文件放到classes属性所代表的文件夹内 -->
        <javac destdir="${classes}" debug="true" includeantruntime="yes"
            deprecation="false" optimize="false" failonerror="true">
            <!-- 指定需要编译的Java文件所在的位置 -->
            <src path="${src}"/>
            <!-- 指定编译Java文件所需要第三方类库所在的位置 -->
            <classpath refid="classpath"/>
        </javac>
    </target>
</project>
<?xml version="1.0" encoding="GBK"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
    http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    version="3.1">
    <!-- 配置第一个参数：driver -->
    <context-param>
        <param-name>driver</param-name>
        <param-value>com.mysql.jdbc.Driver</param-value>
    </context-param>
    <!-- 配置第二个参数：url -->
    <context-param>
        <param-name>url</param-name>
        <param-value>jdbc:mysql://localhost:3306/javaee</param-value>
    </context-param>
    <!-- 配置第三个参数：user -->
    <context-param>
        <param-name>user</param-name>
        <param-value>root</param-value>
    </context-param>
    <!-- 配置第四个参数：pass -->
    <context-param>
        <param-name>pass</param-name>
        <param-value>32147</param-value>
    </context-param>


    <servlet>
        <!-- 指定Servlet名字 -->
        <servlet-name>config</servlet-name>
        <!-- 指定将哪个JSP页面配置成Servlet -->
        <jsp-file>/configTest2.jsp</jsp-file>
        <!-- 配置名为name的参数，值为crazyit.org -->
        <init-param>
            <param-name>name</param-name>
            <param-value>crazyit.org</param-value>
        </init-param>
        <!-- 配置名为age的参数，值为30 -->
        <init-param>
            <param-name>age</param-name>
            <param-value>30</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <!-- 指定将config Servlet配置到/config URL-->
        <servlet-name>config</servlet-name>
        <url-pattern>/config</url-pattern>
    </servlet-mapping>
    
</web-app>
package lee;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;

import java.io.*;

/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
@WebServlet(name="get-application",
    urlPatterns={"/get-application"})
public class GetApplication extends HttpServlet
{
    public void service(HttpServletRequest request,
        HttpServletResponse response)throws IOException
    {
        response.setContentType("text/html;charset=gb2312");
        PrintWriter out = response.getWriter();
        out.println("<html><head><title>");
        out.println("测试application");
        out.println("</title></head><body>");
        ServletContext sc = getServletConfig().getServletContext();
        out.print("application中当前的counter值为:");
        out.println(sc.getAttribute("counter"));
        out.println("</body></html>");
    }
}

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