How to comment code on jsp page-javaTutorial-php.cn

How to comment code on jsp page

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Release： 2019-06-04 16:15:54

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Here we introduce the comments of various codes in JSP. css comment: /* This is the CSS comment * /; js comment: // Here is the JS comment; html comment: < !- - This is a JSP file - ->; Java comment: // Here is the java script ;JSP dynamic tag comment: <%- -Here is the JSP dynamic tag comment- -%>

##Please take a look at the example ：

如下为JSP中各种注释的具体体现
<%@ page language="java" contentType="text/html; charset=UTF-8"
   %>
<%@ page session="true"  import="java.util.Date,java.text.SimpleDateFormat"  pageEncoding="UTF-8" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP的三种java脚本</title>
<style type="text/css">
    div{
        border:1px solid;/*这里是CSS注释*/
    }
</style>

<script type="text/javascript">
    function func(){
        //这里是JS注释
    }
</script>
</head>
<body>
<!-- 这是一个JSP文件 -->
<h1>java脚本</h1>
<% 
    //这里是java小脚本，生成java类时，不做任何翻译。  定义的所有的变量都是局部变量。存在于_jspService方法中
    int x = 10;
    //int z = x/0;
    System.out.println("x="+x);

    session.setAttribute("pageName", "index.jsp");
    System.out.println(session.getAttribute("pageName"));
%>
<hr/>
<%
x++;
System.out.println("x="+x);
%>
<h1>脚本表达式</h1>
<!-- 将java的表达式的结果输出到页面  通过out.print方法 -->
x=<%=x+10 %>

<h1>脚本申明</h1>
<%!
    //在生成的java代码中申明成员变量和成员方法
    public void method(){

    }

    String str = "abc";
%>
<%-- 这里是JSP注释 --%>
<ul>
    <li><a href="show.jsp?op=1">刘备</a></li>
    <li><a href="show.jsp?op=2">关羽</a></li>
    <li><a href="show.jsp?op=3">张飞</a></li>
</ul>
<h1>当前服务器系统时间</h1>
<%
    Date date = new Date();
    SimpleDateFormat format = new SimpleDateFormat("YYYY-MM-dd HH:mm:ss");
    String dateStr = format.format(date);
%>
<%=dateStr %>
<hr/>
<h1>JSTL</h1>
<c:out value="${pageName }"/>
<h1>session中区数据</h1>
<%=session.getAttribute("sname") %>
</body>
</html>

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Summary: JSP function: simplify writing html tags, dynamically generate web page content (java code can be written in jsp) demonstration, each element in the jsp file Comments

<%- - Comments in jsp files: will not be translated into .java files - -%>

<%- - HTML comments, java code cannot be commented out , however, it still works in html files - -%>

<%- - java comments will be translated into .java files intact - -%>

<%- - Summary: Use which type of comments you want to see in which type of file - -%>

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