对象list转化

Service层在做业务处理的时候，通常会把DAO层的domain类转化成DTO，并向上层提供服务。

对于类变化不大的情况，可以使用beanUtils做处理。

为了实现通用性，我封装了该类，代码如下：

import net.xuele.common.utils.format.JsonUtils;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.collections.CollectionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

/**
 * 拷贝对象属性到新的类，使用了commons的BeanUtils
 *
 * @author wull
 */
public class CopyObjListUtil{
	private static Logger logger = LoggerFactory.getLogger(CopyObjListUtil.class);

	public static  List convert(Collection srcList, Class targetClazz) {
		if (CollectionUtils.isEmpty(srcList)) {
			return Collections.emptyList();
		}

		T target = null;
		try {
			List dist = new ArrayList();
			for (S src : srcList) {
				//目标类注意必须实现空构造函数
				target = targetClazz.newInstance();
				BeanUtils.copyProperties(target, src);
				dist.add(target);
			}
			return dist;
		} catch (Exception e) {
			logger.error("对象{}复制属性出错:{}", targetClazz.getSimpleName(), JsonUtils.toJson(srcList));
			throw new IllegalArgumentException("对象" + targetClazz.getSimpleName() + "复制属性出错", e);
		}
	}

	/**
	 *
	 * @param src
	 * @param targetClazz
	 * @return
	 */
	public static  T convert(S src, Class targetClazz) {
		if (src == null ) {
			return null;
		}
		try {
				//目标类注意必须实现空构造函数
			T target = targetClazz.newInstance();
			BeanUtils.copyProperties(target, src);
			return target;
		} catch (Exception e) {
			logger.error("对象{}复制属性出错:{}", targetClazz.getSimpleName(), JsonUtils.toJson(src));
			throw new IllegalArgumentException("对象" + targetClazz.getSimpleName() + "复制属性出错", e);
		}
	}

	public static void main(String[] args) {
		TestCls srcCls = new TestCls();
		srcCls.setName("张三");

		List srcList = new ArrayList();
		srcList.add(srcCls);
		List targetList = CopyObjListUtil.convert(srcList, TestDTO.class);
		System.out.println(JsonUtils.toJson(targetList));
	}

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

	/**
	 * 目标类必须有无参构造参数
	 */
	public static class TestDTO implements Serializable {
		private static final long serialVersionUID = -1470656206298577026L;
		private String name;
		public String getName() {
			return name;
		}
		public void setName(String name) {
			this.name = name;
		}
	}
}