javabean 嵌套属性赋值

import java.beans.PropertyDescriptor;
import org.apache.commons.beanutils.PropertyUtils;

/**
 * 需beanutils jar包
 * 属性格式嵌套用"."相隔
 */
public class Test {
    public static void main(String[] args) throws Exception {
        Class<?> c = A.class;
        Object instance = c.newInstance();
        String name ="name";
        String value ="aname";
        setBeanProperty(instance, name, value);
        name = "b.name";
        value="bname";
        setBeanProperty(instance, name, value);
        A a = (A) instance;
        System.out.println(a.getName()+":"+a.getB().getName());
    }
    
    /** 
     * populate property 
     * @param o  实例对象
     * @param name 被赋值属性字符描述 格式：a.b.c.....
     * @param value 原始值
     * @throws Exception
     */
    private static void setBeanProperty(Object o,String name,String value) throws Exception{
        String[] propDiscribe = name.split("\\.");
        if(propDiscribe.length==1){//simple
            PropertyUtils.setProperty(o, name, value);
        }else{//nested property
            if(initNestedProperties(o,name)){
                PropertyUtils.setNestedProperty(o, name, value);
            };
        }
    }
    
    /** 
     * 初始化嵌套属性前面的对象
     * 如a.b.name 先检测对象a的b属性是否为null，若是构造空对象
     * @param obj
     * @param fieldDescribe
     * @return
     */
    private static boolean initNestedProperties(Object obj, String fieldDescribe){
        try{
            String[] fieldNames = fieldDescribe.split("\\.");
            if (fieldNames.length > 1) {
                StringBuffer nestedProperty = new StringBuffer();
                for (int i = 0; i < fieldNames.length - 1; i++) {
                    String fn = fieldNames[i];
                    if (i != 0) {
                        nestedProperty.append(".");
                    }
                    nestedProperty.append(fn);
                    Object value = PropertyUtils.getProperty(obj, nestedProperty.toString());
                    if (value == null) {
                        PropertyDescriptor propertyDescriptor = PropertyUtils.getPropertyDescriptor(obj, nestedProperty.toString());
                        Class<?> propertyType = propertyDescriptor.getPropertyType();
                        Object newInstance = propertyType.newInstance();
                        PropertyUtils.setProperty(obj, nestedProperty.toString(), newInstance);
                    }
                }
            }
        }catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }
}

public class A {
    private String name;
    private B b;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public B getB() {
        return b;
    }
    public void setB(B b) {
        this.b = b;
    }
}

public class B {
    private String name;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}