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Spring - Directly setting fields via DirectFieldAccess

[Last Updated: Jun 17, 2021]

DirectFieldAccessor is another implementation of ConfigurablePropertyAccessor which can be used to directly setting/getting instance fields.

DirectFieldAccessor supports nested property paths and collection indexed access as well.

Examples

Bean

package com.logicbig.example;

class Person {
  private String name;
  private int age;

  @Override
  public String toString() {
      return "Person{" +
              "name='" + name + '\'' +
              ", age=" + age +
              '}';
  }
}

Using DirectFieldAccessor

package com.logicbig.example;

import org.springframework.beans.DirectFieldAccessor;

public class DirectFieldAccessorExample {

    public static void main (String[] args) {
        DirectFieldAccessor fieldAccessor = new DirectFieldAccessor(new Person());
        fieldAccessor.setPropertyValue("name", "Mike");
        fieldAccessor.setPropertyValue("age", "32");
        Object person = fieldAccessor.getWrappedInstance();
        System.out.println(person);
    }
}

Output

Person{name='Mike', age=32}

Setting nested properties using DirectFieldAccessor

package com.logicbig.example;

import java.util.List;

class PersonGroup {
    private String groupName;
    private List<Person> personList;

    @Override
    public String toString() {
        return "PersonGroup{" +
                "groupName='" + groupName + '\'' +
                ", personList=" + personList +
                '}';
    }
}
package com.logicbig.example;

import org.springframework.beans.DirectFieldAccessor;
import java.util.ArrayList;

public class DirectFieldAccessorNestedFieldsExample {

    public static void main (String[] args) {
        DirectFieldAccessor fieldAccessor = new DirectFieldAccessor(new PersonGroup());
        fieldAccessor.setPropertyValue("groupName", "BaseballTeam");
        fieldAccessor.setPropertyValue("personList", new ArrayList<>());

        fieldAccessor.setPropertyValue("personList[0]", new Person());
        fieldAccessor.setPropertyValue("personList[0].name", "Mike");
        fieldAccessor.setPropertyValue("personList[0].age", 24);

        fieldAccessor.setPropertyValue("personList[1]", new Person());
        fieldAccessor.setPropertyValue("personList[1].name", "Raj");
        fieldAccessor.setPropertyValue("personList[1].age", 26);

        Object personGroup = fieldAccessor.getWrappedInstance();
        System.out.println(personGroup);
    }
}

Output

PersonGroup{groupName='BaseballTeam', personList=[Person{name='Mike', age=24}, Person{name='Raj', age=26}]}

Example Project

Dependencies and Technologies Used:

  • spring-context 5.3.8: Spring Context. Version Compatibility: 4.2.0.RELEASE - 5.3.8 Version List
    ×

    Version compatibilities of spring-context with this example:

    • 4.2.0.RELEASE
    • 4.2.1.RELEASE
    • 4.2.2.RELEASE
    • 4.2.3.RELEASE
    • 4.2.4.RELEASE
    • 4.2.5.RELEASE
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    • 5.3.8

    Versions in green have been tested.

  • JDK 8
  • Maven 3.8.1

Spring - DirectFieldAccessor Example Select All Download
  • spring-bean-direct-field-accessor-example
    • src
      • main
        • java
          • com
            • logicbig
              • example
                • DirectFieldAccessorExample.java

    See Also