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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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`mbean`{{execute T2}}
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### 查看 Mbean 的元信息
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`mbean -m java.lang:type=Threading`{{execute T2}}
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### 查看mbean属性信息
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`mbean java.lang:type=Threading `{{execute T2}}
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### mbean的name支持通配符匹配
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`mbean java.lang:type=Th*`{{execute T2}}
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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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### 多属性名称的匹配
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查看内存池：
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`mbean java.lang:name=*,type=MemoryPool`{{execute T2}}
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### 通配符匹配特定的属性字段
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`mbean java.lang:type=Threading *Count`{{execute T2}}
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### 使用`-E`命令切换为正则匹配
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`mbean -E java.lang:type=Threading PeakThreadCount|ThreadCount|DaemonThreadCount`{{execute T2}}
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查看内存池：
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`mbean -E java.lang:name=*,type=MemoryPool Name|Usage|Type | grep " HEAP" -A3 -B1`{{execute T2}}
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### 使用`-i`命令实时监控
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`mbean -i 1000 java.lang:type=Threading *Count`{{execute T2}}
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