Spring EL ternary operator (if-then-else) example

Spring EL supports ternary operator , perform “if then else” conditional checking. For example,

condition ? true : false

Spring EL in Annotation

Spring EL ternary operator with @Value annotation. In this example, if “itemBean.qtyOnHand” is less than 100, then set “customerBean.warning” to true, else set it to false.

package com.mkyong.core;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component; @Component("customerBean")
public class Customer { @Value("#{itemBean.qtyOnHand < 100 ? true : false}")
private boolean warning; public boolean isWarning() {
return warning;
} public void setWarning(boolean warning) {
this.warning = warning;
} @Override
public String toString() {
return "Customer [warning=" + warning + "]";
} }
package com.mkyong.core;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component; @Component("itemBean")
public class Item { @Value("99")
private int qtyOnHand; public int getQtyOnHand() {
return qtyOnHand;
} public void setQtyOnHand(int qtyOnHand) {
this.qtyOnHand = qtyOnHand;
} }

Output

Customer [warning=true]

Spring EL in XML

See equivalent version in bean definition XML file.

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="customerBean" class="com.mkyong.core.Customer">
<property name="warning"
value="#{itemBean.qtyOnHand < 100 ? true : false}" />
</bean> <bean id="itemBean" class="com.mkyong.core.Item">
<property name="qtyOnHand" value="99" />
</bean> </beans>

Output

Customer [warning=true]

In XML, you need to replace less than operator "<" with "&lt;".

上一篇:移动端页面调试神器-browser-sync


下一篇:使用Cookie进行会话管理