Spring Framework

Using BeanUtils.copyProperties for the same bean type.

package com.logicbig.example.beanutils;

import com.logicbig.example.TestBean;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

public class CopyPropsToSameType {
    public static void main (String[] args) {
        BeanWrapper bw = new BeanWrapperImpl(new TestBean());
        bw.setPropertyValue("aString", "someString");
        bw.setPropertyValue("anInt", 3);

        TestBean testBean2 = new TestBean();

        BeanUtils.copyProperties(bw.getWrappedInstance(), testBean2);

        System.out.println(testBean2);
    }
}

Output

TestBean{aString='someString', anInt=3, date=Mon May 01 16:08:07 CDT 2017}

BeanUtils#copyProperties for different beans type example.

package com.logicbig.example.beanutils;

import com.logicbig.example.TestBean;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

public class CopyPropsToDifferentType {
    public static void main (String[] args) {
        BeanWrapper bw = new BeanWrapperImpl(new TestBean());
        bw.setPropertyValue("aString", "someString");
        bw.setPropertyValue("anInt", 3);

        TestBeanDifferent testBean2 = new TestBeanDifferent();

        //only properties of same name will be copied
        BeanUtils.copyProperties(bw.getWrappedInstance(), testBean2);

        System.out.println(testBean2);
    }

    private static class TestBeanDifferent {
        private String aString;
        private int differentInt;

        public String getAString () {
            return aString;
        }

        public void setAString (String aString) {
            this.aString = aString;
        }

        public int getDifferentInt () {
            return differentInt;
        }

        public void setDifferentInt (int differentInt) {
            this.differentInt = differentInt;
        }

        @Override
        public String toString () {
            return "TestBeanDifferent{" +
                                "aString='" + aString + '\'' +
                                ", differentInt=" + differentInt +
                                '}';
        }
    }
}

Output

TestBeanDifferent{aString='someString', differentInt=0}

Using BeanUtils.getPropertyDescriptors and comparing with Introspector alternative.

package com.logicbig.example.beanutils;

import com.logicbig.example.TestBean;
import org.springframework.beans.BeanUtils;

import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.util.Arrays;

public class PropDescriptorExample {
    public static void main (String[] args) throws IntrospectionException {
        PropertyDescriptor[] actual = Introspector.getBeanInfo(TestBean.class)
                                                  .getPropertyDescriptors();
        PropertyDescriptor[] descriptors = BeanUtils.getPropertyDescriptors(TestBean.class);

        System.out.println(Arrays.toString(actual));
        System.out.println(Arrays.toString(descriptors));
    }
}

Output

[java.beans.PropertyDescriptor[name=AString; propertyType=class java.lang.String; readMethod=public java.lang.String com.logicbig.example.TestBean.getAString(); writeMethod=public void com.logicbig.example.TestBean.setAString(java.lang.String)], java.beans.PropertyDescriptor[name=anInt; propertyType=int; readMethod=public int com.logicbig.example.TestBean.getAnInt(); writeMethod=public void com.logicbig.example.TestBean.setAnInt(int)], java.beans.PropertyDescriptor[name=class; propertyType=class java.lang.Class; readMethod=public final native java.lang.Class java.lang.Object.getClass()], java.beans.PropertyDescriptor[name=date; propertyType=class java.util.Date; readMethod=public java.util.Date com.logicbig.example.TestBean.getDate()]]

Using BeanUtils.resolveSignature example. Parsing string to do that.

package com.logicbig.example.beanutils;

import org.springframework.beans.BeanUtils;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class ResolveSignature {

    public static void main (String[] args) throws
                        InvocationTargetException, IllegalAccessException {
        Method doSomething = BeanUtils.resolveSignature("aMethod(java.lang.String, int)",
                            LocalBean.class);
        doSomething.invoke(new LocalBean(), "some string value", 100);

        doSomething = BeanUtils.resolveSignature("aMethod(java.lang.Integer)",
                            LocalBean.class);
        doSomething.invoke(new LocalBean(), 200);
    }

    private static class LocalBean {
        public void aMethod (String str, int anInt) {
            System.out.println(str);
            System.out.println(anInt);
        }

        public void aMethod (Integer anInt) {
            System.out.println(anInt);
        }
    }
}

Output

some string value
100
200

Using BeanUtils.resolveSignature example. Resolving method with no arguments.

package com.logicbig.example.beanutils;

import org.springframework.beans.BeanUtils;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class ResolveSignature2 {

    public static void main (String[] args) throws
                        InvocationTargetException, IllegalAccessException {
        Method doSomething = BeanUtils.resolveSignature("doSomething",
                            LocalBean.class);
        doSomething.invoke(new LocalBean());
    }

    private static class LocalBean {
        public void doSomething () {
            System.out.println("-- doing something -- ");

        }
    }
}

Output

-- doing something --

Using BeanUtils.getPropertyDescriptors.

package com.logicbig.example;

import org.springframework.beans.BeanUtils;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;

public class BeanUtilPropDescriptorExample {
    public static void main (String[] args) throws IntrospectionException {
        PropertyDescriptor[] javaDescriptor = Introspector.getBeanInfo(Person.class)
                                                  .getPropertyDescriptors();
        System.out.println("-- jdk property descriptor --");
        printPropertyDescriptor(javaDescriptor);
        PropertyDescriptor[] springDescriptor = BeanUtils.getPropertyDescriptors(Person.class);
        System.out.println("-- spring property descriptor --");
        printPropertyDescriptor(springDescriptor);

    }

    private static void printPropertyDescriptor(PropertyDescriptor[] descriptors) {
        for (PropertyDescriptor descriptor : descriptors) {
            System.out.println("Name: "+descriptor.getName());
            System.out.println("Reader: "+descriptor.getReadMethod());
            System.out.println("Writer: "+descriptor.getWriteMethod());
            System.out.println("------");
        }
    }
}

Output

-- jdk property descriptor --
Name: class
Reader: public final native java.lang.Class java.lang.Object.getClass()
Writer: null
------
Name: name
Reader: public java.lang.String com.logicbig.example.Person.getName()
Writer: null
------
-- spring property descriptor --
Name: class
Reader: public final native java.lang.Class java.lang.Object.getClass()
Writer: null
------
Name: name
Reader: public java.lang.String com.logicbig.example.Person.getName()
Writer: public java.lang.String com.logicbig.example.Person.setName(java.lang.String)
------

Original Post

package com.logicbig.example;

import org.springframework.beans.BeanUtils;

public class CopyPropsExample {
    public static void main (String[] args) {
       Person person = new Person();
       person.setName("Mike");
       person.setAge(34);

       Employee employee = new Employee();
       BeanUtils.copyProperties(person, employee);
        System.out.println(employee);
    }
}

Output

Employee{name='Mike', age=34, dept='null'}

Original Post

package com.logicbig.example;

import org.springframework.beans.BeanUtils;

public class CopyPropsExample2 {
    public static void main(String[] args) {
        Employee employee = new Employee();
        employee.setName("Mike");
        employee.setAge(34);
        employee.setDept("IT");

        Person person = new Person();
        BeanUtils.copyProperties(employee, person);
        System.out.println(person);
    }
}

Output

Person{name='Mike', age=34}

Original Post

Using BeanUtils.resolveSignature example. Parsing string to do that.

package com.logicbig.example;

import org.springframework.beans.BeanUtils;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class ResolveSignature {

    public static void main(String[] args) throws
            InvocationTargetException, IllegalAccessException {
        Method method = BeanUtils.resolveSignature("aMethod(java.lang.String, int)", LocalBean.class);
        System.out.println("resolved method: " + method);
        method.invoke(new LocalBean(), "some string value", 100);

        method = BeanUtils.resolveSignature("aMethod(java.lang.Integer)", LocalBean.class);
        System.out.println("resolved method: " + method);
        method.invoke(new LocalBean(), 200);
    }

    private static class LocalBean {
        public void aMethod(String str, int anInt) {
            System.out.printf("aMethod invoked with params, str: %s, anInt: %s%n", str, anInt);
        }

        public void aMethod(Integer anInt) {
            System.out.printf("aMethod invoked with param, anInt: %s%n", anInt);
        }
    }
}

Output

resolved method: public void com.logicbig.example.ResolveSignature$LocalBean.aMethod(java.lang.String,int)
aMethod invoked with params, str: some string value, anInt: 100
resolved method: public void com.logicbig.example.ResolveSignature$LocalBean.aMethod(java.lang.Integer)
aMethod invoked with param, anInt: 200

Original Post

Using BeanUtils.resolveSignature example. Resolving method with no arguments.

package com.logicbig.example;

import org.springframework.beans.BeanUtils;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class ResolveSignature2 {

    public static void main(String[] args) throws
            InvocationTargetException, IllegalAccessException {
        Method method = BeanUtils.resolveSignature("doSomething", LocalBean.class);
        System.out.println("resolved method: "+method);
        method.invoke(new LocalBean());
    }

    private static class LocalBean {
        public void doSomething() {
            System.out.println("-- doing something -- ");
        }
    }
}

Output

resolved method: public void com.logicbig.example.ResolveSignature2$LocalBean.doSomething()
-- doing something --

Original Post

package com.logicbig.example;

import org.springframework.beans.BeanUtils;

public class CopyPropsEditableExample {
    public static void main(String[] args) {
        Rectangle rectangle = new Rectangle();
        rectangle.setColor("blue");
        rectangle.setLength(5);
        rectangle.setWidth(4);

        Square square = new Square();
        BeanUtils.copyProperties(rectangle, square, Shape.class);
        System.out.println(square);
    }
}

Output

Square{length=null, color='blue'}

Original Post

import org.springframework.beans.BeanUtils;

public class CopyPropsIgnoreExample {
    public static void main(String[] args) {
        Rectangle rectangle = new Rectangle();
        rectangle.setColor("blue");
        rectangle.setLength(5);
        rectangle.setWidth(4);

        Square square = new Square();
        BeanUtils.copyProperties(rectangle, square, "color");
        System.out.println(square);
    }
}

Output

Square{length=5, color='null'}

Original Post

Spring Framework - BeanUtils Examples

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See Also