代码优化工具-测试程序执行时间-IDEAdebug+StopWatch

参考：
[技巧]IDEA的debug+StopWatch监测程序运行时间

添加链接描述

1创建类StopWatchExpand

 import lombok.extern.slf4j.Slf4j;import org.springframework.util.StopWatch;import java.text.NumberFormat;/*** 检测程序片段运行时间拓展** @author sdevil507* created on 2021/5/27*/
@Slf4j
public class StopWatchExpand {/*** StopWatch实例*/private static StopWatch STOP_WATCH;/*** StopWatch实例初始化*/public static void init() {STOP_WATCH = new StopWatch("运行时间");}/*** 开启计时** @param taskName 任务名称* @return 提示字符串*/public static String start(String taskName) {STOP_WATCH.start(taskName);return "[ 任务: " + taskName + " ]" + " 监测运行时间开始......";}/*** 结束计时*/public static void stop() {STOP_WATCH.stop();}/*** 格式化的统计输出** @return 统计输出*/public static String prettyPrint() {// 获取运行的毫秒数与秒数long totalTimeMillis = STOP_WATCH.getTotalTimeMillis();double totalTimeSeconds = STOP_WATCH.getTotalTimeSeconds();// 编写总结String shortSummary = "StopWatch '" + STOP_WATCH.getId() + "': running time [ " + String.format("%9s", totalTimeMillis) + "ms / " + String.format("%9.3f", totalTimeSeconds) + "s ]";StringBuilder sb = new StringBuilder();sb.append("---------------------------------------------------------------\n");sb.append(shortSummary);sb.append('\n');sb.append("---------------------------------------------------------------\n");sb.append("       ms           s      %      Task name\n");sb.append("---------------------------------------------------------------\n");NumberFormat pf = NumberFormat.getPercentInstance();pf.setMinimumIntegerDigits(3);pf.setGroupingUsed(false);for (StopWatch.TaskInfo task : STOP_WATCH.getTaskInfo()) {sb.append(String.format("%9s", task.getTimeMillis())).append("   ");sb.append(String.format("%9.3f", task.getTimeSeconds())).append("   ");sb.append(pf.format((double) task.getTimeMillis() / totalTimeMillis)).append("      ");sb.append(task.getTaskName()).append("\n");}return sb.toString();}
}

2在需要查看代码的时间的地方打断点并进去
(0)在最开始的地方设置init:StopWatchExpand.init();
（1）在代码开始段设置start:StopWatchExpand.start("获取basic");

（2）在代码末尾段设置
StopWatchExpand.stop(); StopWatchExpand.prettyPrint();

可以在每个需要看时长的地方加上start和stop【这两个是一对，前提是一定要init】，最后调用的prettyPrint（）是第一步自定义的方法，会格式化打印