JSP入门与示例-优快云博客

什么是Jsp

JSP(全称JavaServer Pages) 其根本是一个简化的Servlet设计，他实现了在java中使用Html标签。jsp是一种动态网络技术标准.也是JAVAEE的标准。Jsp和Servlet一样，是服务器端执行的。

Jsp与其他动态网站开发技术的优缺点

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Jsp元素构成

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jsp指令
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page指令
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jsp注释

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jsp脚本语法

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jsp声明变量

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jsp表达式表示方法

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 <%@page import="java.text.SimpleDateFormat"%>
<%@ page language="java" import="java.util.*"
    contentType="text/html; charset=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 href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</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">
<!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
</head>

<body>
    Hello This is my JSP page.
    <br>
    <h1>大家好</h1>
    <!-- 我是html注释 -->
    <%--我是jsp注释 --%>
    <%!String s = "jack";

    int add(int x, int y) {

        return x + y;

    }%>

    <%
        //单行注释
        /*
                      多行注释
         */
        out.print("欢迎学习javaee");
    %>

    <br> 你好<%=s%><br> x+y=<%=add(10, 5)%>


    <br>
    <%!SimpleDateFormat sdf = new SimpleDateFormat();
    String date = sdf.format(new Date());%>
    今天是<%=date%>
</body>
</html>

显示效果如下
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下面我们用两种方法打印九九乘法表

<%@page import="com.sun.xml.internal.fastinfoset.tools.PrintTable"%>
<%@ page language="java" import="java.util.*"
    contentType="text/html; charset=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 href="<%=basePath%>">

<title>My JSP 'execise.jsp' starting page</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">
<!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

</head>

<body>
    <h1>九九乘法表</h1>
    <%!String pirntTable1() {
        String s = "";
        for (int i = 1; i < 10; i++) {
            for (int j = 1; j <= i; j++) {
                s += i + "*" + j + "=" + (i * j) + "&nbsp;&nbsp;&nbsp;&nbsp;";

            }
            s += "<br>";
        }

        return s;
    }%>
    <br>
    <%=pirntTable1()%>

    <h1>脚本方式打印九九乘法表</h1>

    <%!void pirntTable2(JspWriter out) throws Exception {

        for (int i = 1; i < 10; i++) {
            for (int j = 1; j <= i; j++) {
                out.println(i + "*" + j + "=" + (i * j)
                        + "&nbsp;&nbsp;&nbsp;&nbsp;");

            }
            out.println("<br>");
        }

    }%>
    <br>

    <%
        pirntTable2(out);
    %>

</body>
</html>