StopWatch 监控Java代码运行时间和分析性能

我们在日常进行Java语言开发时，可能需要监控不同方法的运行时间，知道性能瓶颈在哪。利用springframework框架的工具类StopWatch可以快速方便的查看到每段代码运行的时间，准确确定性能瓶颈所在。
原文:http://blog.csdn.net/hj289860219/article/details/75262037

使用StopWatch类也很简单。new出实例，调用该实例的start（）和stop（）方法即可。如下代码

[java] view plain copy

print?

1.        StopWatch stopWatch = new StopWatch();  
2.         //房间类型图片  
3.         List<ImageData> images = platenoHotelService.getHotelImage(innId, 2);  
4.         Map<String, String> imageUrl = new HashMap<>();  
5.         if (images !=null) {  
6.             for (ImageData image : images) {  
7.                 imageUrl.put(image.getRoomTypeCode(), image.getImageUrl());  
8.             }  
9.         }  
10.         //调用酒店房型列表  
11.         stopWatch.start(”search.getHotelRoomType”);  
12.         String roomType = platenoHotelService.getHotelRoomType(innId);  
13.         stopWatch.stop();  
14.         stopWatch.start(”search.parseObject”);  
15.         JSONObject roomTypeList = JSONObject.parseObject(roomType);  
16.         JSONArray roomTypeArray = roomTypeList.getJSONObject(”data”).getJSONArray(“roomTypeData”);  
17.         stopWatch.stop();  
18.         List<HotelRoomTypeVO> hotelRoomTypeVOList = new ArrayList<>();  
19.         stopWatch.start(”search.roomTypeArrayForeach”);  
20.         for (Object roomTypeItem : roomTypeArray) {  
21.             JSONObject roomTypeObject = (JSONObject)roomTypeItem;  
22.             HotelRoomTypeVO hotelRoom = JSONObject.toJavaObject(roomTypeObject, HotelRoomTypeVO.class);  
23.             if(hotelRoom.getValid() == 1) {  
24.                 RealRoomStatusData realRoomStatusData = platenoHotelService.getHotelRoomInfo(innId, hotelRoom.getRoomTypeCode(), endOfDay, sourceType, days);  
25.                 if (realRoomStatusData != null) {  
26.                     hotelRoom.setImageUrl(imageUrl.get(hotelRoom.getRoomTypeCode()));  
27.                     hotelRoom.setRealRoomStatusData(realRoomStatusData);  
28.                     hotelRoomTypeVOList.add(hotelRoom);  
29.                 }  
30.             }  
31.   
32.         }  
33.         stopWatch.stop();  
34.         logger.info(”[酒店房型列表耗时：]” + stopWatch.prettyPrint());  

        StopWatch stopWatch = new StopWatch();        //房间类型图片        List<ImageData> images = platenoHotelService.getHotelImage(innId, 2);        Map<String, String> imageUrl = new HashMap<>();        if (images !=null) {            for (ImageData image : images) {                imageUrl.put(image.getRoomTypeCode(), image.getImageUrl());            }        }        //调用酒店房型列表        stopWatch.start("search.getHotelRoomType");        String roomType = platenoHotelService.getHotelRoomType(innId);        stopWatch.stop();        stopWatch.start("search.parseObject");        JSONObject roomTypeList = JSONObject.parseObject(roomType);        JSONArray roomTypeArray = roomTypeList.getJSONObject("data").getJSONArray("roomTypeData");        stopWatch.stop();        List<HotelRoomTypeVO> hotelRoomTypeVOList = new ArrayList<>();        stopWatch.start("search.roomTypeArrayForeach");        for (Object roomTypeItem : roomTypeArray) {            JSONObject roomTypeObject = (JSONObject)roomTypeItem;            HotelRoomTypeVO hotelRoom = JSONObject.toJavaObject(roomTypeObject, HotelRoomTypeVO.class);            if(hotelRoom.getValid() == 1) {                RealRoomStatusData realRoomStatusData = platenoHotelService.getHotelRoomInfo(innId, hotelRoom.getRoomTypeCode(), endOfDay, sourceType, days);                if (realRoomStatusData != null) {                    hotelRoom.setImageUrl(imageUrl.get(hotelRoom.getRoomTypeCode()));                    hotelRoom.setRealRoomStatusData(realRoomStatusData);                    hotelRoomTypeVOList.add(hotelRoom);                }            }        }        stopWatch.stop();        logger.info("[酒店房型列表耗时：]" + stopWatch.prettyPrint());

为了查看结果，调用prettyPrint()方法即可，下图就是上面示例的运行结果。可以看出总花费时间6062ms。三列分别为监控代码段的花费时间（毫秒）、百分比、名称。可以很直观看出每段代码的运行时间以及所占比分比，帮助我们快速找到主要性能问题。