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The <c:out> tag is used to display the result of an expression, similar to <%= %>, the difference is that the <c:out> tag can directly access properties through the "." operator.
For example, if you want to access customer.address.street, you just need to write like this: <c:out value="customer.address.street">.
The <c:out> tag automatically ignores XML marker characters, so they will not be treated as tags.
<c:out value="<string>" default="<string>" escapeXml="<true|false>"/>
The <c:out> tag has the following attributes:
| Attribute | Description | Is it necessary | Default value |
|---|---|---|---|
| value | Content to be output | Yes | None |
| default | Default output value | No | Content in the main body |
| escapeXml | Whether to ignore XML special characters | No | true |
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title>c:out Tag Example</title>
</head>
<body>
<h1<c:out> Example/h1>
<c:out value="<The data object to be displayed (without using escape characters)>" escapeXml="true" default="default value"></c:out><br/>
<c:out value="<The data object to be displayed (using escape characters)>" escapeXml="false" default="default value"></c:out><br/>
<c:out value="${null}" escapeXml="false">If the result of the expression used is null, output the default value</c:out><br/>
</body>
</html>The running result is as follows:
<c:out> Example <The data object to be displayed (without using escape characters)> <The data object to be displayed (using escape characters)> If the result of the expression used is null, output the default value