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mbean
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=======
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> 查看 Mbean 的信息
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这个命令可以便捷的查看或监控 Mbean 的属性信息。
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### 参数说明
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|参数名称|参数说明|
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|---:|:---|
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|*name-pattern*|名称表达式匹配|
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|*attribute-pattern*|属性名表达式匹配|
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|[m]|查看元信息|
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|[i:]|刷新属性值的时间间隔 (ms)|
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|[n:]|刷新属性值的次数|
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|[E]|开启正则表达式匹配，默认为通配符匹配。仅对属性名有效|
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### 使用参考
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列出所有 Mbean 的名称：
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```bash
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mbean
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```
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查看 Mbean 的元信息：
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```bash
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mbean -m java.lang:type=Threading
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```
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查看mbean属性信息：
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```bash
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mbean java.lang:type=Threading
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```
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mbean的name支持通配符匹配：
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```bash
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mbean java.lang:type=Th*
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```
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>注意：ObjectName 的匹配规则与正常的通配符存在差异，详细参见：[javax.management.ObjectName](https://docs.oracle.com/javase/8/docs/api/javax/management/ObjectName.html?is-external=true)
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通配符匹配特定的属性字段：
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```bash
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mbean java.lang:type=Threading *Count
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```
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使用`-E`命令切换为正则匹配：
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```bash
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mbean -E java.lang:type=Threading PeakThreadCount|ThreadCount|DaemonThreadCount
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```
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使用`-i`命令实时监控：
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```bash
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mbean -i 1000 java.lang:type=Threading *Count
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```
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