BeanUtils和BeanMap对象相互转换 对比
BeanUtils和BeanMap对象相互转换 对比
可以使用BeanMap，进行Bean对象和Map相互转换，也可以用BeanUtil的方式进行Bean对象和Map相互转换，两种之间的效率如何呢？ 该如何选择？
1，对比Bean对象转换为List的情况
测试：
private final static int SIZE = 500000;
private static List> shapeLists = ShapeListMapFactory.create(SIZE);
private static List shapeBeanList = ShapeFactory.create(SIZE);
public static void main(String[] args) {
System.out.println("======== compare BeanMap and JOSN change beans to list ===========");
testBeansToList();
changeBeansToListMap();
}
public static void testBeansToList(){
System.out.println("========== BeanMapUtils change beans to listMap ============");
long startTime = System.currentTimeMillis();
BeanMapUtils.changeBeansToList(shapeBeanList);
long endTime = System.currentTimeMillis();
System.out.println("BeanMapUtils.listsToBeans转换耗费的时间：" + (endTime - startTime) + "ms");
}
public static void changeBeansToListMap() {
List
将size改为: 500000
结果1：
======== compare BeanMap and BeanUtil change beans to list ===========
========== BeanMapUtils change beans to listMap ============
BeanMapUtils.beansToMaps 转换耗费的时间：938ms
========== BeanUtils change beans to listMap ============
BeanUtils.listsToBeans 转换耗费的时间：593ms
结果2：
======== compare BeanMap and BeanUtil change beans to list ===========
========== BeanMapUtils change beans to listMap ============
BeanMapUtils.beansToMaps 转换耗费的时间：989ms
========== BeanUtils change beans to listMap ============
BeanUtils.listsToBeans 转换耗费的时间：516ms
将size改为: 1000000
结果3：
======== compare BeanMap and BeanUtil change beans to list ===========
========== BeanMapUtils change beans to listMap ============
BeanMapUtils.beansToMaps 转换耗费的时间：908ms
========== BeanUtils change beans to listMap ============
BeanUtils.listsToBeans 转换耗费的时间：1040ms
结果4：
======== compare BeanMap and BeanUtil change beans to list ===========
========== BeanMapUtils change beans to listMap ============
BeanMapUtils.beansToMaps 转换耗费的时间：973ms
========== BeanUtils change beans to listMap ============
BeanUtils.listsToBeans 转换耗费的时间：1006ms
将size改为: 2000000
结果5：
======== compare BeanMap and BeanUtil change beans to list ===========
========== BeanMapUtils change beans to listMap ============
BeanMapUtils.beansToMaps 转换耗费的时间：2129ms
========== BeanUtils change beans to listMap ============
BeanUtils.listsToBeans 转换耗费的时间：2683ms
结果6：
======== compare BeanMap and BeanUtil change beans to list ===========
========== BeanMapUtils change beans to listMap ============
BeanMapUtils.beansToMaps 转换耗费的时间：2222ms
========== BeanUtils change beans to listMap ============
BeanUtils.listsToBeans 转换耗费的时间：3051ms
分析：
有结果可以看出，小于1百万的时候，BeanUtils处理把beans转为list的时候，效率会更好，之后的话，BeanMap处理性能会更好。
2，对比 将List转换为Bean对象
测试：
private final static int SIZE = 500000;
private static List> shapeLists = ShapeListMapFactory.create(SIZE);
private static List shapeBeanList = ShapeFactory.create(SIZE);
public static void main(String[] args) {
System.out.println("======== compare BeanMap and BeanUtil change list to beans ===========");
testBeanMapListToBeans();
testBeanUtilsListMapToBeans();
}
public static void testBeanMapListToBeans(){
System.out.println("======== BeanMapUtils change listMap to beans ========");
long startTime = System.currentTimeMillis();
BeanMapUtils.changeListToBeans(shapeLists, Shape.class);
long endTime = System.currentTimeMillis();
System.out.println("BeanMapUtils.mapsToBeans 转换耗费的时间：" + (endTime - startTime) + "ms");
}
public static void testBeanUtilsListMapToBeans() {
System.out.println("========== BeanUtils change list to Bean ============");
long startTime = System.currentTimeMillis();
BeanUtils.listsToBeans(shapeLists, Shape.class);
long endTime = System.currentTimeMillis();
System.out.println("BeanUtils listsToBeans 转换耗费的时间：" + (endTime - startTime) + "ms");
}
size: 500000
结果1：
======== compare BeanMap and BeanUtil change list to beans ===========
======== BeanMapUtils change listMap to beans ========
BeanMapUtils.mapsToBeans 转换耗费的时间：1114ms
========== BeanUtils change list to Bean ============
BeanUtils listsToBeans 转换耗费的时间：530ms
结果2：
======== compare BeanMap and BeanUtil change list to beans ===========
======== BeanMapUtils change listMap to beans ========
BeanMapUtils.mapsToBeans 转换耗费的时间：1078ms
========== BeanUtils change list to Bean ============
BeanUtils listsToBeans 转换耗费的时间：511ms
size: 1000000
结果3：
======== compare BeanMap and BeanUtil change list to beans ===========
======== BeanMapUtils change listMap to beans ========
BeanMapUtils.mapsToBeans 转换耗费的时间：954ms
========== BeanUtils change list to Bean ============
BeanUtils listsToBeans 转换耗费的时间：868ms
结果4：
======= compare BeanMap and BeanUtil change list to beans ===========
======== BeanMapUtils change listMap to beans ========
BeanMapUtils.mapsToBeans 转换耗费的时间：958ms
========== BeanUtils change list to Bean ============
BeanUtils listsToBeans 转换耗费的时间：874ms
size: 2000000
结果5：
======== compare BeanMap and BeanUtil change list to beans ===========
======== BeanMapUtils change listMap to beans ========
BeanMapUtils.mapsToBeans 转换耗费的时间：1708ms
========== BeanUtils change list to Bean ============
BeanUtils listsToBeans 转换耗费的时间：2245ms
结果6：
======== compare BeanMap and BeanUtil change list to beans ===========
======== BeanMapUtils change listMap to beans ========
BeanMapUtils.mapsToBeans 转换耗费的时间：1862ms
========== BeanUtils change list to Bean ============
BeanUtils listsToBeans 转换耗费的时间：2011ms
分析：
有结果可以看出，跟把Bean对象转为List的情况相似。小数量的BeanUtil更有优势。
总结
比较完两者的效率，在数据量很大的情况下，进行Bean转为为List的情况下，BeanMap的方式比较合适。不过实际中一般也不会进行那样大量的转换。 平时使用BeanUtil就好了，引用的代码也比BeanMap更简洁，而且还有更多好用的功能