I have a bean, ${product}
. I would like to view all of the available fields / properties of this bean. So for instance, ${product.price}
, ${product.name}
, ${product.attributes.colour}
etc.
Is it possible to dynamically print out all names and values of these properties in JSP, using JSTL/EL?
Something like:
<c:forEach items="${product}" var="p">
${p.key} - ${p.value}
</c:forEach>
Replace object with the bean to determine.
<c:set var="object" value="${product}" />
Display all declared fields and their values.
<c:if test="${not empty object['class'].declaredFields}">
<h2>Declared fields <em>${object.name}</em></h2>
<ul>
<c:forEach var="field" items="${object['class'].declaredFields}">
<c:catch><li><span style="font-weight: bold">
${field.name}: </span>${object[field.name]}</li>
</c:catch>
</c:forEach>
</ul>
</c:if>
Display all declared methods.
<c:if test="${not empty object['class'].declaredMethods}">
<h2>Declared methods<em><% object.getName() %></em></h2>
<ul>
<c:forEach var="method" items="${object['class'].declaredMethods}">
<c:catch><li>${method.name}</li></c:catch>
</c:forEach>
</ul>
</c:if>
Ready to use version of @Toby's answer
<p class="TODO <your name> PRINT OBJECT PROPERTIES">
<c:set var="object" value="${<your object here>}" />
<h2><b>Object: ${object.class} </b></h2>
<h3><b>Declared fields</b></h3>
<c:if test="${!empty object.class.declaredFields}">
<ul>
<c:forEach var="attr" items="${object.class.declaredFields}">
<c:catch><li><b>${attr.name}</b>: ${object[attr.name]}</li></c:catch>
</c:forEach>
</ul>
</c:if>
<c:if test="${empty object.class.declaredFields}">No declared fields</c:if>
<h3><b>Declared methods</b></h3>
<c:if test="${!empty object.class.declaredMethods}">
<ul>
<c:forEach var="attr" items="${object.class.declaredMethods}">
<c:catch><li><b>${attr.name}</b>(...)</li></c:catch>
</c:forEach>
</ul>
</c:if>
<c:if test="${empty object.class.declaredMethods}">No declared methods</c:if>
</p>
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