对象拷贝

import org.springframework.cglib.beans.BeanCopier;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @ClassName: BeanCopyUtils
 * @author: yaozhenhua
 * @date: 2019/1/29 16:47
 */
public class BeanCopyUtils {
    private static ConcurrentHashMap<String, BeanCopier> beanCopierConcurrentHashMap = new ConcurrentHashMap<>();
    
    public static <T> T copyEntity(Object source, Class<T> destClazz) throws IllegalAccessException, InstantiationException {
        if(source==null){
        return null;
        }
        return copyBean(getCopier(source, destClazz), source, destClazz);
    }
    
    public static <T> T copyObject(Object source, T t) {
        return copyBean(getCopier(source, t), source, t);
    }
    
    public static <T> List<T> copyList(List<?> source, Class<T> destClazz) throws IllegalAccessException, InstantiationException {
        if (!EmptyUtils.isEmpty(source)) {
            Object tempItem = source.get(0);
            BeanCopier beanCopier = getCopier(tempItem, destClazz);
            List<T> result = new ArrayList<>(source.size());
            for (Object item : source){
                result.add(copyBean(beanCopier, item, destClazz));
            }
            return result;
        }
        return null;
    }
    
    private static <T> BeanCopier getCopier(Object source, Class<T> destClazz) {
        return getCopier(source.getClass(), destClazz);
    }
    
    private static <T> BeanCopier getCopier(Object source, T t) {
        return getCopier(source.getClass(), t.getClass());
    }
    
    private static <T> BeanCopier getCopier(Class<?> sourceClazz, Class<T> destClazz){
        String copierName = sourceClazz.getName()+"&"+destClazz.getName();
        BeanCopier beanCopier = beanCopierConcurrentHashMap.get(copierName);
        if (beanCopier == null){
            beanCopier = BeanCopier.create(sourceClazz, destClazz, false);
            beanCopierConcurrentHashMap.put(copierName, beanCopier);
        }
        return beanCopier;
    }
    
    private static <T> T copyBean(BeanCopier beanCopier, Object source, Class<T> destClazz) throws IllegalAccessException, InstantiationException {
        T t = destClazz.newInstance();
        return copyBean(beanCopier, source, t);
    }
    
    private static <T> T copyBean(BeanCopier beanCopier, Object source, T t) {
        beanCopier.copy(source, t, null);
        return t;
    }
}

原文链接:https://www.cnblogs.com/gavin-yao/p/10494336.html
如有疑问请与原作者联系

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