Spring EL supports most of the standard mathematical, logical or relational operators. For example,
- Relational operators – equal (
==
,eq
), not equal (!=
,ne
), less than (<
,lt
), less than or equal (<=
,le
), greater than (>
,gt
), and greater than or equal (>=
,ge
). - Logical operators –
and
,or
, andnot
(!
). - Mathematical operators – addition (
+
), Subtraction (-
), Multiplication (*
), division (/
), modulus (%
) and exponential power (^
).
Spring EL in Annotation
This example demonstrates the use of operators in SpEL.
package com.mkyong.core;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Component;@Component("customerBean")public class Customer { //Relational operators @Value("#{1 == 1}") //true private boolean testEqual; @Value("#{1 != 1}") //false private boolean testNotEqual; @Value("#{1 < 1}") //false private boolean testLessThan; @Value("#{1 <= 1}") //true private boolean testLessThanOrEqual; @Value("#{1 > 1}") //false private boolean testGreaterThan; @Value("#{1 >= 1}") //true private boolean testGreaterThanOrEqual; //Logical operators , numberBean.no == 999 @Value("#{numberBean.no == 999 and numberBean.no < 900}") //false private boolean testAnd; @Value("#{numberBean.no == 999 or numberBean.no < 900}") //true private boolean testOr; @Value("#{!(numberBean.no == 999)}") //false private boolean testNot; //Mathematical operators @Value("#{1 + 1}") //2.0 private double testAdd; @Value("#{'1' + '@' + '1'}") //1@1 private String testAddString; @Value("#{1 - 1}") //0.0 private double testSubtraction; @Value("#{1 * 1}") //1.0 private double testMultiplication; @Value("#{10 / 2}") //5.0 private double testDivision; @Value("#{10 % 10}") //0.0 private double testModulus ; @Value("#{2 ^ 2}") //4.0 private double testExponentialPower; @Override public String toString() { return "Customer [testEqual=" + testEqual + ", testNotEqual=" + testNotEqual + ", testLessThan=" + testLessThan + ", testLessThanOrEqual=" + testLessThanOrEqual + ", testGreaterThan=" + testGreaterThan + ", testGreaterThanOrEqual=" + testGreaterThanOrEqual + ", testAnd=" + testAnd + ", testOr=" + testOr + ", testNot=" + testNot + ", testAdd=" + testAdd + ", testAddString=" + testAddString + ", testSubtraction=" + testSubtraction + ", testMultiplication=" + testMultiplication + ", testDivision=" + testDivision + ", testModulus=" + testModulus + ", testExponentialPower=" + testExponentialPower + "]"; } }
package com.mkyong.core;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Component;@Component("numberBean")public class Number { @Value("999") private int no; public int getNo() { return no; } public void setNo(int no) { this.no = no; }}
Run it
Customer obj = (Customer) context.getBean("customerBean"); System.out.println(obj);
Output
Customer [ testEqual=true, testNotEqual=false, testLessThan=false, testLessThanOrEqual=true, testGreaterThan=false, testGreaterThanOrEqual=true, testAnd=false, testOr=true, testNot=false, testAdd=2.0, testAddString=1@1, testSubtraction=0.0, testMultiplication=1.0, testDivision=5.0, testModulus=0.0, testExponentialPower=4.0]
Spring EL in XML
See equivalent version in bean definition XML file. In XML, symbol like "less than
" is always not support, instead, you should use the textual equivalents shown above, for example, ('<
' = 'lt
') and ('<=
' = 'le
').