package com.dechy.hebswj.test;

public class UserA {

private String a;

    private String b;

    public String getA() {

        return a;

    }

    public void setA(String a) {

        this.a = a;

    }

    public String getB() {

        return b;

    }

    public void setB(String b) {

        this.b = b;

    }

}

package com.dechy.hebswj.test;

public class UserB {

private String a;

    private String b;

    private String c;

    public String getA() {

        return a;

    }

    public void setA(String a) {

        this.a = a;

    }

    public String getB() {

        return b;

    }

    public void setB(String b) {

        this.b = b;

    }

    public String getC() {

        return c;

    }

    public void setC(String c) {

        this.c = c;

    }

    @Override

    public String toString() {

        return "UserB [a=" + a + ", b=" + b + ", c=" + c + "]";

    }

}

package com.dechy.hebswj.test;

import org.apache.commons.beanutils.BeanUtils;

import org.junit.Test;

public class userTest {

    @Test

    public void test() throws Exception{

        UserA userA=new UserA();

        userA.setA("a");

        userA.setB("b");

        UserB userB=new UserB();

        BeanUtils.copyProperties(userB, userA);

        System.out.println(userB);

    }

}

UserB [a=a, b=b, c=null]