<%@ page contentType="text/html; charset=GBK"%> <% long totalMemory = Runtime.getRuntime().totalMemory(); long freeMemory = Runtime.getRuntime().freeMemory(); long usedMemory = totalMemory - freeMemory; java.text.NumberFormat format = new java.text.DecimalFormat("###,###"); String memoryInfo="垃圾回收前,内存使用情况为:已用内存/总内存:" + format.format(usedMemory) + "/" + format.format(totalMemory); System.out.println(memoryInfo); out.println("<br>"); out.println(memoryInfo); out.println("<br>"); System.out.println("垃圾回收开始,时间为:"+System.currentTimeMillis()); out.println("垃圾回收开始,时间为:"+System.currentTimeMillis()); System.gc(); totalMemory = Runtime.getRuntime().totalMemory(); freeMemory = Runtime.getRuntime().freeMemory(); usedMemory = totalMemory - freeMemory; memoryInfo="垃圾回收前,内存使用情况为:已用内存/总内存:" + format.format(usedMemory)+ "/" + format.format(totalMemory); System.out.println(memoryInfo); out.println("<br>"); out.println(memoryInfo); System.out.println("垃圾回收结束,时间为:"+System.currentTimeMillis()); out.println("<br>"); out.println("垃圾回收结束,时间为:"+System.currentTimeMillis()); %>
结果为:
垃圾回收前,内存使用情况为:已用内存/总内存:27,045,560/51,408,896
垃圾回收开始,时间为:1308902698673
垃圾回收前,内存使用情况为:已用内存/总内存:19,768,072/51,408,896
垃圾回收结束,时间为:1308902699023