CODEWITHSUNDEEP
javareflectionintrospectionapache-commons-beanutils
Veera
Veera

Reputation: 33182

How to get the list of all attributes of a Java object using BeanUtils introspection?

I have method which gets a POJO as it's parameter. Now I want to programmatically get all the attributes of the POJO (because my code may not know what are all the attributes in it at run time) and need to get the values for the attributes also. Finally I'll form a string representation of the POJO.

I could use ToStringBuilder, but I want build my output string in certain format specific to my requirement.

Is it possible to do so in Beanutils !? If yes, any pointers to the method name? If no, should I write my own reflection code?

Upvotes: 16

Views: 61504

Answers (3)

John Meagher
John Meagher

Reputation: 24708

Have you tried ReflectionToStringBuilder? It looks like is should do what you describe.

Upvotes: 12

Jorge Palacio
Jorge Palacio

Reputation: 355

I know this is a year old question, but I think it can be useful for others.

I have found a partial solution using this LOC

Field [] attributes =  MyBeanClass.class.getDeclaredFields();

Here is a working example:

import java.lang.reflect.Field;

import org.apache.commons.beanutils.PropertyUtils;

public class ObjectWithSomeProperties {

    private String firstProperty;

    private String secondProperty;


    public String getFirstProperty() {
        return firstProperty;
    }

    public void setFirstProperty(String firstProperty) {
        this.firstProperty = firstProperty;
    }

    public String getSecondProperty() {
        return secondProperty;
    }

    public void setSecondProperty(String secondProperty) {
        this.secondProperty = secondProperty;
    }

    public static void main(String[] args) {

        ObjectWithSomeProperties object = new ObjectWithSomeProperties();

        // Load all fields in the class (private included)
        Field [] attributes =  object.getClass().getDeclaredFields();

        for (Field field : attributes) {
            // Dynamically read Attribute Name
            System.out.println("ATTRIBUTE NAME: " + field.getName());

            try {
                // Dynamically set Attribute Value
                PropertyUtils.setSimpleProperty(object, field.getName(), "A VALUE");
                System.out.println("ATTRIBUTE VALUE: " + PropertyUtils.getSimpleProperty(object, field.getName()));
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }
}

Upvotes: 19

Rakesh Juyal
Rakesh Juyal

Reputation: 36749

get all properties/variables ( just the name ) using reflection. Now use getProperty method to get the value of that variable

Upvotes: 3

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