package com.xxx.beancopier;import java.lang.annotation.Documented;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;import java.lang.reflect.Method;import java.lang.reflect.Modifier;/** * @Type BeanCopier * @Desc 属性copy类 * @author * @date 2017-01-06 * @Version V1.0 */public class BeanCopier {    private BeanCopier() {    }    public static 
     
       DestType propertiesCopy(Object orig, DestType dest) {        if (orig == null || dest == null) {            throw new RuntimeException("参数不能为null");        }        Method[] destMethods = dest.getClass().getMethods();        for (Method destMethod : destMethods) {            if (needCopy(destMethod)) {                MethodCopy methodCopy = new MethodCopy(destMethod);                methodCopy.copy(orig, dest);            }        }        return dest;    }    private static boolean needCopy(Method method) {        PropertyCopy annotation = method.getAnnotation(PropertyCopy.class);        if (annotation != null && annotation.ignore())            return false;        return method.getName().startsWith("set") && method.getParameterTypes().length == 1                && Modifier.isPublic(method.getModifiers()) && !Modifier.isStatic(method.getModifiers());    }    static class MethodCopy {        private Method method;        private String methodName;        private Method getterMethod;        public MethodCopy(Method destMethod) {            method = destMethod;            methodName = destMethod.getName();        }        private void copy(Object orig, Object dest) {            try {                this.getterMethod = orig.getClass().getMethod("get" + methodName.substring(3));            } catch (NoSuchMethodException e) {                throw new RuntimeException("对象【" + orig + "】中缺失【" + methodName.replaceFirst("set", "get") + "()】方法！");            }            Object propertyValue = invokeMethod(orig, getterMethod);            if (propertyValue != null) {                invokeMethod(dest, method, propertyValue);            }        }        private Object invokeMethod(Object targerObject, Method method, Object... args) {            if (method == null) {                throw new RuntimeException("被调用方法不能为空！");            }            // 验证参数数量            Class
      [] parameterTypes = method.getParameterTypes();            if (parameterTypes.length != args.length) {                throw new RuntimeException("方法【" + method + "】的参数数量【" + parameterTypes.length + "】和反射调用时的参数数量【"                        + args.length + "】不相符，无法完成调用！");            }            try {                method.setAccessible(true);                return method.invoke(targerObject, args);            } catch (Throwable e) {                throw new RuntimeException("调用对象【" + targerObject + "】的【" + method + "】方法，参数为【" + args + "】时发生异常：", e);            }        }    }}@Retention(RetentionPolicy.RUNTIME)@Target({ ElementType.METHOD })@Documented@interface PropertyCopy {    /**     * 被标注方法是否被忽略拷贝     * @return     */    boolean ignore() default false;}
     

 使用如下：

StudentDTO studentDTO1 = BeanCopier.propertiesCopy(student, new StudentDTO());