java获取运行时虚拟机内存情况

/**
     * 获取系统内存使用情况
     *
     * @return 包含最大内存, 使用内存, 剩余内存的map对象
     */
    @Override
    public Map getXtncSyqk() {
        Map map = new HashMap();
        long maxMem = Runtime.getRuntime().maxMemory()/1024/1024;
        long freeMem = Runtime.getRuntime().freeMemory()/1024/1024;
        long usedMem = maxMem - freeMem;
        map.put("MaxMemory", maxMem + "MB");
        map.put("UsedMemory", usedMem + "MB");
        map.put("FreeMemory", freeMem + "MB");
        return map;
    }

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原文：http://blog.csdn.net/w_basketboy24/article/details/25403749