使用commons-beanutils向java 类动态添加属性

<!--使用cglib 为javabean动态添加属性-->
        <dependency>
            <groupId>commons-beanutils</groupId>
            <artifactId>commons-beanutils</artifactId>
            <version>1.9.3</version>
        </dependency>
 
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version> 1.2.54</version>
        </dependency>

package com.example.cloudprovider.api;
 
 
public class Apple {
    private int height;
    private int price;
    private int money;
 
    public Apple() {
    }
 
    public Apple(int height, int price){
        this.height = height;
        this.price = price;
        this.money = height*price;
    }
 
    public int getHeight() {
        return height;
    }
 
    public void setHeight(int height) {
        this.height = height;
    }
 
    public int getPrice() {
        return price;
    }
 
    public void setPrice(int price) {
        this.price = price;
    }
 
    public int getMoney() {
        return getHeight()*getPrice();
    }
 
    public void setMoney(int money) {
        this.money = getHeight()*getPrice();
    }
}

package com.example.cloudprovider.api;
 
import com.google.common.collect.Maps;
import org.apache.commons.beanutils.PropertyUtilsBean;
 
import java.beans.PropertyDescriptor;
import java.util.Map;
 
 
public class PicBeanAddPropertiesUtil {
    public static Object getTarget(Object dest, Map<String, Object> addProperties) {
        // get property map
        PropertyUtilsBean propertyUtilsBean = new PropertyUtilsBean();
        PropertyDescriptor[] descriptors = propertyUtilsBean.getPropertyDescriptors(dest);
        Map<String, Class> propertyMap = Maps.newHashMap();
        for (PropertyDescriptor d : descriptors) {
            if (!"class".equalsIgnoreCase(d.getName())) {
                propertyMap.put(d.getName(), d.getPropertyType());
            }
        }
        // add extra properties
        addProperties.forEach((k, v) -> propertyMap.put(k, v.getClass()));
        // new dynamic bean
        DynamicBean dynamicBean = new DynamicBean(dest.getClass(), propertyMap);
        // add old value
        propertyMap.forEach((k, v) -> {
            try {
                // filter extra properties
                if (!addProperties.containsKey(k)) {
                    dynamicBean.setValue(k, propertyUtilsBean.getNestedProperty(dest, k));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        });
        // add extra value
        addProperties.forEach((k, v) -> {
            try {
                dynamicBean.setValue(k, v);
            } catch (Exception e) {
                e.printStackTrace();
            }
        });
        Object target = dynamicBean.getTarget();
        return target;
    }
}

package com.example.cloudprovider.api;
 
import com.alibaba.fastjson.JSON;
import org.springframework.cglib.beans.BeanGenerator;
import org.springframework.cglib.beans.BeanMap;
 
import java.util.HashMap;
import java.util.Map;
 
 
public class DynamicBean {
    /**
     * 目标对象
     */
    private Object target;
    /**
     * 属性集合
     */
    private BeanMap beanMap;
    public DynamicBean(Class superclass, Map<String, Class> propertyMap) {
        this.target = generateBean(superclass, propertyMap);
        this.beanMap = BeanMap.create(this.target);
    }
    /**
     * bean 添加属性和值
     *
     * @param property
     * @param value
     */
    public void setValue(String property, Object value) {
        beanMap.put(property, value);
    }
    /**
     * 获取属性值
     *
     * @param property
     * @return
     */
    public Object getValue(String property) {
        return beanMap.get(property);
    }
    /**
     * 获取对象
     *
     * @return
     */
    public Object getTarget() {
        return this.target;
    }
    /**
     * 根据属性生成对象
     *
     * @param superclass
     * @param propertyMap
     * @return
     */
    private Object generateBean(Class superclass, Map<String, Class> propertyMap) {
        BeanGenerator generator = new BeanGenerator();
        if (null != superclass) {
            generator.setSuperclass(superclass);
        }
        BeanGenerator.addProperties(generator, propertyMap);
        return generator.create();
    }
 
    public static void main(String[] args) {
        Apple entity = new Apple();
        entity.setHeight(111);
        entity.setMoney(222);
        Map<String, Object> addProperties = new HashMap() {{
            put("name", "动态属性值");
            put("field1", "摇一摇送金币");
            put("field2", "参与次数");
        }};
        Apple finalPicBaseReqVo = (Apple) PicBeanAddPropertiesUtil.getTarget(entity, addProperties);
        System.out.println(JSON.toJSONString(finalPicBaseReqVo));
    }
}

输出：

{"field1":"摇一摇送金币","field2":"参与次数","height":111,"money":0,"name":"动态属性值","price":0}