java常用工具类（一）—— Map 与 Bean 之间的互相转换

import net.bytebuddy.implementation.bytecode.Throw;
import org.springframework.cglib.beans.BeanMap;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;


/**
 * @author Lius
 * @date 2018/10/26 13:37
 * @describe 实体工具类，
 */
public class BeanUtils extends org.springframework.beans.BeanUtils {
    public BeanUtils() {
    }

    /**
     * 实例化对象：传入类对类进行实例化对象
     *
     * @param clazz 类
     * @return 对象
     * @author Lius
     * @date 2018/10/26 13:49
     */
    public static  T newInstance(Class clazz) {
        return (T) instantiateClass(clazz);
    }

    /**
     * 实例化对象，传入类名对该类进行实例化对象
     *
     * @param clazzStr 类名,传入是必须传入全路径，com...
     * @return 对象
     * @author Lius
     * @date 2018/10/26 13:54
     */
    public static  T newInstance(String clazzStr) {
        try {
            Class clazz = Class.forName(clazzStr);
            return newInstance(clazz);
        } catch (ClassNotFoundException e) {
            throw new RuntimeException();
        }
    }

    /**
     * 把对象封装成Map形式
     *
     * @param src 需要封装的实体对象
     * @author Lius
     * @date 2018/10/26 14:08
     */
    public static Map toMap(Object src) {
        return BeanMap.create(src);
    }

    /**
     * 把Map转换成bean对象
     *
     * @author Lius
     * @date 2018/10/26 14:09
     */
    public static  T toBean(Map beanMap, Class valueType) {
        // 对象实例化
        T bean = BeanUtils.newInstance(valueType);
        PropertyDescriptor[] propertyDescriptors = getPropertyDescriptors(valueType);
        for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
            String properName = propertyDescriptor.getName();
            // 过滤class属性
            if ("class".equals(properName)) {
                continue;
            }
            if (beanMap.containsKey(properName)) {
                Method writeMethod = propertyDescriptor.getWriteMethod();
                if (null == writeMethod) {
                    continue;
                }
                Object value = beanMap.get(properName);
                if (!writeMethod.isAccessible()) {
                    writeMethod.setAccessible(true);
                }
                try {
                    writeMethod.invoke(bean, value);
                } catch (Throwable throwable) {
                    throw new RuntimeException("Could not set property '" + properName + " ' to bean" + throwable);
                }
            }
        }
        return bean;
    }

    public static void main(String[] args) {
        // Map To Bean
        Map map = new HashMap(16);
        map.put("loginName", "loginName");
        map.put("name", "name");
        map.put("password", "password");
        map.put("salt", "salt");
        map.put("phone", "phone");
        User user = toBean(map, User.class);
        System.out.println(user.getLoginName());

        // Bean To Map
        User user1 = new User();
        Map userMap = toMap(user1);
        System.out.println(userMap);
    }

}