How to inject value into bean properties in Spring

In Spring, there are three ways to inject value into bean properties.

• Normal way
• Shortcut
• “p” schema

See a simple Java class, which contains two properties – name and type. Later you will use Spring to inject value into the bean properties.

package com.tuts.heomi.netmon;

public class FileNameGenerator 
{
	private String name;
	private String type;
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getType() {
		return type;
	}
	public void setType(String type) {
		this.type = type;
	}
}

1. Normal way

Inject value within a ‘value’ tag and enclosed with ‘property’ tag.

<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-2.5.xsd">

	<bean id="FileNameGenerator" class="com.tuts.heomi.netmon.FileNameGenerator">
		<property name="name">
			<value>favtuts</value>
		</property>
		<property name="type">
			<value>txt</value>
		</property>
	</bean>
</beans>

2. Shortcut

Inject value with “value” attribute.

<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-2.5.xsd">

	<bean id="FileNameGenerator" class="com.tuts.heomi.netmon.FileNameGenerator">
		<property name="name" value="favtuts" />
		<property name="type" value="txt" />
	</bean>
	
</beans>

3. “p” schema

Inject value by using “p” schema as an attributes.

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

	<bean id="FileNameGenerator" class="com.tuts.heomi.netmon.FileNameGenerator" 
             p:name="favtuts" p:type="txt" />
	
</beans>

Remember declares the xmlns:p=”http://www.springframework.org/schema/p in the Spring XML bean configuration file.

Conclusion

Which methods to use is totally base on personal preference, it will not affect the value inject into the bean properties.