Listeners
When JMeter is running, the listener provides JMeter access to information about the test case. The result of the graph is that the listener plots the response time on the graph. The View Results Tree listener displays sampler request and response details and can display basic HTML and XML representations of the response. Other listeners provide aggregated or aggregated information.
Additionally, the listener can direct data to a file for later use. Every listener in JMeter provides a field to indicate the file in which to store the data. There's also a configure button that lets you choose which fields to save, and whether to use CSV or XML format.
注意，所有侦听器都保存相同的数据;唯一的区别在于数据在屏幕上呈现的方式。
Listeners can be added anywhere in the test, including directly under the test plan. They only collect data from elements at or below their level.
JMeter has some listeners here .