Spring的获取Bean的性能测试。

package com.liuxt.bean;

import junit.framework.TestCase;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.util.StopWatch;

public class ComputerTest extends TestCase {
 
 public static void main(String[] args) {
  
  AbstractApplicationContext ctx = new ClassPathXmlApplicationContext(
    new String[] { "bean/ComputerBean.xml" });
  ComputerBean computer1=(ComputerBean)ctx.getBean("computer");
  ComputerBean computer2=(ComputerBean)ctx.getBean("computer");
  System.out.println("computer1===computer2:"+(computer1==computer2));
  
  testGetBeanFromSpring(ctx);
  testNewInstaniate();

  ctx.destroy();
 }

 private static StopWatch testGetBeanFromSpring(AbstractApplicationContext ctx) {
  StopWatch stopWatch=new StopWatch();
  stopWatch.start();
  ComputerBean computer=(ComputerBean)ctx.getBean("computer");
  for(int i=0;i<100000;i++){
   computer=(ComputerBean)ctx.getBean("computer");
   computer.sum(i,i);
  }
  stopWatch.stop();
  System.out.println("100000 gets took "+stopWatch.getTotalTimeMillis()+" ms");
  return stopWatch;
 }

 private static void testNewInstaniate() {
  ComputerBean computer3;
  StopWatch stopWatch=new StopWatch();
  stopWatch.start();  
  for(int i=0;i<100000;i++){
   computer3=new ComputerBean();
   computer3.sum(i,i);
  }
  stopWatch.stop();
  System.out.println("100000 gets took "+stopWatch.getTotalTimeMillis()+" ms");
 }

}

 

测试的前提条件：

 JDK：java version "1.6.0_13"

winxp  cpu:2.6Ghz

 

测试结果：

  computer1===computer2:false
100000 gets took 907 ms
100000 gets took 0 ms

 

不知道为什么差距这么大。

请大家帮忙解释一下啊。。。期待中。