Spring - Setter Injection with Non-String Collection

When you want to perform setter injection with a collection that contains non-string values (like custom objects), Spring provides an efficient way to handle it. Let's consider an example where we want to inject a list of Book objects into a Library class.

1. Java Classes:

   // Book.java public class Book { private String title; public Book(String title) { this.title = title; } public String getTitle() { return title; } @Override public String toString() { return "Book: " + title; } } // Library.java public class Library { private List<Book> books; public void setBooks(List<Book> books) { this.books = books; } public void displayBooks() { for (Book book : books) { System.out.println(book); } } } 

2. Spring XML Configuration:

   Create a beans.xml configuration file:

   <?xml version="1.0" encoding="UTF-8"?> <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.xsd"> <!-- Book beans --> <bean id="book1" class="Book"> <constructor-arg value="The Great Gatsby"/> </bean> <bean id="book2" class="Book"> <constructor-arg value="Moby Dick"/> </bean> <!-- Library bean with list injection --> <bean id="library" class="Library"> <property name="books"> <list> <ref bean="book1"/> <ref bean="book2"/> </list> </property> </bean> </beans> 

   In the XML above, we define two Book beans and inject them into the Library bean using a <list> element.

3. Test the Configuration:

   Create a main class to load the beans and test the configuration:

   import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class App { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml"); Library library = (Library) context.getBean("library"); library.displayBooks(); } } 

   Running this main class should display:

   Book: The Great Gatsby Book: Moby Dick 

In this example, we used a <list> for setter injection, but you can also use <set>, <map>, or <props> for other collection types. The process remains the same: define individual beans and reference them within the collection element.

Examples

1. Spring Setter Injection with non-string Collection example:

   • Description: Demonstrates how to use setter injection to inject a collection of non-string objects into a Spring bean.
   • Code:

     public class MyBean { private Collection<CustomObject> myCollection; public void setMyCollection(Collection<CustomObject> myCollection) { this.myCollection = myCollection; } } 

2. Injecting a Collection of non-string objects using Setter Injection in Spring:

   • Description: Illustrates how to inject a collection of non-string objects using setter injection in the Spring framework.
   • Code:

     public class MyBean { private Collection<NonStringObject> myCollection; public void setMyCollection(Collection<NonStringObject> myCollection) { this.myCollection = myCollection; } } 

3. Setter Injection with non-string Collection in Spring Framework:

   • Description: Guides on setter injection with a collection of non-string objects in the Spring framework.
   • Code:

     public class MyBean { private Collection<CustomObject> myCollection; public void setMyCollection(Collection<CustomObject> myCollection) { this.myCollection = myCollection; } } 

4. Spring Setter Injection for injecting a Collection of non-string dependencies:

   • Description: Demonstrates how to use setter injection to inject a collection of non-string dependencies in a Spring bean.
   • Code:

     public class MyBean { private Collection<DependencyObject> dependencyCollection; public void setDependencyCollection(Collection<DependencyObject> dependencyCollection) { this.dependencyCollection = dependencyCollection; } } 

5. Using @Autowired with non-string Collection in Spring:

   • Description: Shows how to use @Autowired for injecting a collection of non-string objects in Spring using setter injection.
   • Code:

     public class MyBean { private Collection<CustomObject> myCollection; @Autowired public void setMyCollection(Collection<CustomObject> myCollection) { this.myCollection = myCollection; } } 

6. Setter-based injection of non-string Collection in Spring components:

   • Description: Demonstrates setter-based injection of a collection of non-string objects in Spring components.
   • Code:

     @Component public class MyComponent { private Collection<CustomObject> myCollection; @Autowired public void setMyCollection(Collection<CustomObject> myCollection) { this.myCollection = myCollection; } } 

7. Injecting a Collection of custom objects using Setter Injection in Spring:

   • Description: Shows how to inject a collection of custom objects using setter injection in a Spring bean.
   • Code:

     public class MyBean { private Collection<MyCustomObject> myCollection; public void setMyCollection(Collection<MyCustomObject> myCollection) { this.myCollection = myCollection; } } 

8. Configuring Setter Injection for non-string Collection in Spring Beans:

   • Description: Guides on configuring setter injection for a collection of non-string objects in Spring beans.
   • Code:

     @Component public class MyComponent { private Collection<CustomObject> myCollection; @Autowired public void setMyCollection(Collection<CustomObject> myCollection) { this.myCollection = myCollection; } } 

9. Spring Setter Injection for handling non-string elements in a Collection:

   • Description: Illustrates how to use setter injection for handling non-string elements in a collection in Spring.
   • Code:

     public class MyBean { private Collection<NonStringElement> myCollection; public void setMyCollection(Collection<NonStringElement> myCollection) { this.myCollection = myCollection; } } 

10. Setter Injection with non-string Collection in Spring components:

    • Description: Demonstrates setter injection with a collection of non-string objects in Spring components.
    • Code:

      @Component public class MyComponent { private Collection<CustomObject> myCollection; @Autowired public void setMyCollection(Collection<CustomObject> myCollection) { this.myCollection = myCollection; } } 

11. Using @Resource for Setter Injection with non-string Collection in Spring:

    • Description: Shows how to use @Resource for setter injection with a collection of non-string objects in Spring.
    • Code:

      public class MyBean { private Collection<CustomObject> customObjectCollection; @Resource public void setCustomObjectCollection(Collection<CustomObject> customObjectCollection) { this.customObjectCollection = customObjectCollection; } } 

12. Spring Setter Injection for injecting dependencies as a non-string Collection:

    • Description: Demonstrates how to use setter injection for injecting dependencies as a collection of non-string objects in a Spring bean.
    • Code:

      public class MyBean { private Collection<DependencyObject> dependencyCollection; public void setDependencyCollection(Collection<DependencyObject> dependencyCollection) { this.dependencyCollection = dependencyCollection; } } 

13. Setter-based injection with autowired non-string Collection in Spring:

    • Description: Demonstrates setter-based injection with autowired collection of non-string objects in Spring components.
    • Code:

      @Component public class MyComponent { private Collection<CustomObject> customObjectCollection; @Autowired public void setCustomObjectCollection(Collection<CustomObject> customObjectCollection) { this.customObjectCollection = customObjectCollection; } } 

14. Spring Setter Injection with different types of non-string Collections:

    • Description: Illustrates how to use setter injection with different types of collections (e.g., List, Set) containing non-string elements in Spring.
    • Code:

      public class MyBean { private List<NonStringObject> myList; private Set<MyCustomObject> mySet; public void setMyList(List<NonStringObject> myList) { this.myList = myList; } public void setMySet(Set<MyCustomObject> mySet) { this.mySet = mySet; } } 

15. Injecting properties as a non-string Collection using Setter Injection in Spring:

    • Description: Shows how to use setter injection to inject properties as a collection of non-string objects in Spring beans.
    • Code:

      public class MyBean { private Collection<MyPropertyObject> myCollection; public void setMyCollection(Properties properties) { // Convert properties to a collection of custom objects this.myCollection = convertPropertiesToCollection(properties); } } 

16. Configuring Spring beans with Setter Injection and non-string Collection:

    • Description: Guides on configuring Spring beans with setter injection and a collection of non-string objects.
    • Code:

      @Component public class MyComponent { private Collection<MyCustomObject> myCollection; @Autowired public void setMyCollection(Collection<MyCustomObject> myCollection) { this.myCollection = myCollection; } } 

17. Spring Setter Injection with non-string Collection of dependencies:

    • Description: Demonstrates how to use setter injection with a collection of dependencies as non-string objects in a Spring bean.
    • Code:

      public class MyBean { private Collection<AnotherDependency> dependencyCollection; public void setDependencyCollection(Collection<AnotherDependency> dependencyCollection) { this.dependencyCollection = dependencyCollection; } } 

18. Setter Injection with non-string Collection for managing custom objects in Spring:

    • Description: Demonstrates setter injection with a collection of non-string objects for managing custom objects in Spring.
    • Code:

      @Component public class MyComponent { private Collection<MyCustomObject> customObjectCollection; @Autowired public void setCustomObjectCollection(Collection<MyCustomObject> customObjectCollection) { this.customObjectCollection = customObjectCollection; } } 

19. Handling non-string Collections with dependent objects in Spring Setter Injection:

    • Description: Guides on handling collections of non-string objects with dependent objects using setter injection in the Spring framework.
    • Code:

      public class MyBean { private Collection<DependentObject> dependentObjectCollection; public void setDependentObjectCollection(Collection<DependentObject> dependentObjectCollection) { this.dependentObjectCollection = dependentObjectCollection; } } 

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