In our previous tutorial we have explained in detail about how to use the spring expression language. This tutorial is a simple example to demonstrate how to use the expression language in XML configuration file.
Employee.java
package javabeat.net.core; import org.springframework.stereotype.Component; @Component public class Employee { private String name; private String empId; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getEmpId() { return empId; } public void setEmpId(String empId) { this.empId = empId; } }
Company.java
package javabeat.net.core; import org.springframework.stereotype.Component; @Component public class Company { private String name; private Employee employee; public String getName() { return name; } public void setName(String name) { this.name = name; } public Employee getEmployee() { return employee; } public void setEmployee(Employee employee) { this.employee = employee; } }
SpringExpressionDemo.java
package javabeat.net.core; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class SpringExpressionDemo { public static void main(String args[]){ ApplicationContext context = new ClassPathXmlApplicationContext("javabeat/net/core/beans.xml"); Company company = (Company)context.getBean("company"); System.out.println("Company Name : " + company.getName()); System.out.println("Employee Name : " + company.getEmployee().getName()); System.out.println("Employee ID : " + company.getEmployee().getEmpId()); } }
beans.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" 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 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <bean id="employee" class="javabeat.net.core.Employee"> <property name="name" value="Name 1"/> <property name="empId" value="0001"/> </bean> <bean id="company" class="javabeat.net.core.Company"> <property name="name" value="JavaBeat"/> <property name="employee" value="#{employee}"/> </bean> </beans>
If you run the above example program, you will get the output as:
Company Name : JavaBeat Employee Name : Name 1 Employee ID : 0001
I hope this tutorial have helped you to understand how to use expression language in the spring xml configuration files.