Detailed Explanation of the Use of Expressions in JSP

  • 2021-12-11 18:39:47
  • OfStack

The JSP expression is used to output information to the page, and its syntax format is as follows:

<%= 表达式 %>

Parameter description:

Expression: It can be a complete expression of any Java speech. The final result of the expression will be converted to a string.

Here are one simple example to demonstrate:


<%@ page language="java" import="java.util.*" 
  contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> 
<!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> Test JSP Use of expressions </title> 
</head> 
<body> 
  <!--  Output variable  --> 
  <% 
    String manager = " Xiao Li "; 
  %> 
   Administrator: <%=manager%> 
  <%=" Administrator: " + manager%> 
  <!--  Output expression evaluation results  --> 
  <%=1 + 2%> 
  <!--  Execute Java Code  --> 
  <% 
    int x = 10; 
    out.println(x); 
  %> 
  <!--  Inserts an expression into the HTML Mark in --> 
  <% 
    String url = "test.png"; 
  %> 
  <img src="images/<%=url%>" /> 
  <br> 
  <!--  Output system time  --> 
  <%=new Date()%> 
  <!--  Execute multiple fragments  --> 
  <% 
    for (int i = 0; i < 5; i++) { 
  %> 
  <H2>http://blog.csdn.net/u010142437</H2> 
  <% 
    } 
  %> 
</body> 
</html> 

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