修改Tomcat最大连接数配置
先教大家怎么去查Tomcat的官网：
首先，打开tomcat官网首页：http://tomcat.apache.org/ ；
然后，我们点击左侧导航栏中“Documentation”下的Tomcat对应版本，进入tomcat文档首页；
再然后，在左侧导航栏中找到Reference下的Configuration，点进去;
最后，在左侧导航栏中找到Connectors中的HTTP/1.1。
http://tomcat.apache.org/
http://tomcat.apache.org/tomcat-8.5-doc/index.html
http://tomcat.apache.org/tomcat-8.5-doc/config/http.html
其中这句话已经介绍得很清楚：
If more simultaneous requests are received than can be handled by the currently available request processing threads, additional threads will be created up to the configured maximum (the value of the maxThreads attribute). If still more simultaneous requests are received, they are stacked up inside the server socket created by the Connector, up to the configured maximum (the value of the acceptCount attribute).
所以我们需要设置的是maxThreads和acceptCount这两个值：
其中，maxThreads的介绍如下：
The maximum number of request processing threads to be created by this Connector, which therefore determines the maximum number of simultaneous requests that can be handled. If not specified, this attribute is set to 200. If an executor is associated with this connector, this attribute is ignored as the connector will execute tasks using the executor rather than an internal thread pool.
而acceptCount的介绍为：
The maximum queue length for incoming connection requests when all possible request processing threads are in use. Any requests received when the queue is full will be refused. The default value is 100.
所以两者的默认值分别是200和100，要调整Tomcat的默认最大连接数，可以增加这两个属性的值，并且使acceptCount大于等于maxThreads：
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" acceptCount="500" maxThreads="400" />
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