JMeterPlugins (插件监听器)Flexible File Writer：这个插件允许你灵活记录测试结果
Filename：结果记录的地方
Overwirte existing file：是否覆盖这个文件
Ｗrite File Header：文件的头(即文件的第一行)
Record each sample：如何记录不同的sample（记录哪些内容，用什么顺序，如何隔开不同的值）
Write File Footer：文件的结尾（即文件的最后一行）
| startTime | epoch time when request was started |
| endTime | epoch time when reading response ended |
| responseTime | response time, time to full response loaded |
| latency | latency, time to first response byte received (if available) |
| responseCode | response code (200, 404 etc.) |
| responseMessage | response message (OK, Not Found etc.) |
| responseHeaders | response headers (if present in sample) |
| responseData | response data |
| requestData | request data from sample |
| sentBytes | number of request bytes sent, if available |
| receivedBytes | number of request bytes sent (if available) |
| threadName | name of thread in Thread Group that processed request |
| sampleLabel | name of the sampler that made request |
| isSuccsessful | is response was marked as successful |
| isFailed | is response was marked as failed (surrogate field) |
| startTimeMillis | same as startTime, but divided by 1000 (surrogate field, example: 1311121131.362) |
| endTimeMillis | same as endTime, but divided by 1000 (surrogate field) |
| responseTimeMicros | same as responseTime, but multiplied by 1000 (surrogate field) |
| latencyMicros | same as latency, but multiplied by 1000 (surrogate field) |
| variable#<N> | Sample variable with index N, see below for details |
示例：将回应数据写入到指定文件
