我正在使用JMeter __FileToString函数来读取请求正文中的JSON文件，如下所示。
${__FileToString(C:\\Users\\prasad\\Office\\SSP\\16.48\\sprint3\\${__eval(${CSV_Challenges_Dataset})}.txt,,)}
但是我在运行测试时遇到了错误。有人能指出我在Windows中如何使用JMeter fileToString函数的正确示例。
2016/11/17 15:01:22 INFO - jmeter.engine.StandardJMeterEngine: Running the test!
2016/11/17 15:01:22 INFO - jmeter.samplers.SampleEvent: List of sample_variables: []
2016/11/17 15:01:22 INFO - jmeter.gui.util.JMeterMenuBar: setRunning(true,*local*)
2016/11/17 15:01:22 INFO - jmeter.engine.StandardJMeterEngine: Starting ThreadGroup: 1 : VerifyDecryptor 1L records
2016/11/17 15:01:22 INFO - jmeter.engine.StandardJMeterEngine: Starting 1 threads for group VerifyDecryptor 1L records.
2016/11/17 15:01:22 INFO - jmeter.engine.StandardJMeterEngine: Thread will continue on error
2016/11/17 15:01:22 INFO - jmeter.threads.ThreadGroup: Starting thread group number 1 threads 1 ramp-up 1 perThread 1000.0 delayedStart=false
2016/11/17 15:01:22 INFO - jmeter.threads.ThreadGroup: Started thread group number 1
2016/11/17 15:01:22 INFO - jmeter.engine.StandardJMeterEngine: Starting ThreadGroup: 2 : Thread Group
2016/11/17 15:01:22 INFO - jmeter.engine.StandardJMeterEngine: Starting 1 threads for group Thread Group.
2016/11/17 15:01:22 INFO - jmeter.engine.StandardJMeterEngine: Thread will continue on error
2016/11/17 15:01:22 INFO - jmeter.threads.ThreadGroup: Starting thread group number 2 threads 1 ramp-up 1 perThread 1000.0 delayedStart=false
2016/11/17 15:01:22 INFO - jmeter.threads.ThreadGroup: Started thread group number 2
2016/11/17 15:01:22 INFO - jmeter.engine.StandardJMeterEngine: All thread groups have been started
2016/11/17 15:01:22 INFO - jmeter.threads.JMeterThread: Thread started: Thread Group 2-1
2016/11/17 15:01:22 INFO - jmeter.threads.JMeterThread: Thread is done: Thread Group 2-1
2016/11/17 15:01:22 INFO - jmeter.threads.JMeterThread: Thread finished: Thread Group 2-1
2016/11/17 15:01:22 INFO - jmeter.threads.JMeterThread: Thread started: VerifyDecryptor 1L records 1-1
2016/11/17 15:01:22 WARN - jmeter.functions.FileToString: Could not read file: C:\Users\prasad\Office\SSP\16.48\sprint3\${CSV_Challenges_Dataset}.txt File 'C:\Users\prasad\Office\SSP\16.48\sprint3\${CSV_Challenges_Dataset}.txt' does not exist java.io.FileNotFoundException: File 'C:\Users\prasad\Office\SSP\16.48\sprint3\${CSV_Challenges_Dataset}.txt' does not exist
at org.apache.commons.io.FileUtils.openInputStream(FileUtils.java:299)
at org.apache.commons.io.FileUtils.readFileToString(FileUtils.java:1711)
at org.apache.commons.io.FileUtils.readFileToString(FileUtils.java:1734)
at org.apache.jmeter.functions.FileToString.execute(FileToString.java:102)
at org.apache.jmeter.engine.util.CompoundVariable.execute(CompoundVariable.java:142)
at org.apache.jmeter.engine.util.CompoundVariable.execute(CompoundVariable.java:117)
at org.apache.jmeter.testelement.property.FunctionProperty.getStringValue(FunctionProperty.java:101)
at org.apache.jmeter.testelement.AbstractTestElement.getPropertyAsString(AbstractTestElement.java:271)
at org.apache.jmeter.config.Argument.getValue(Argument.java:146)
at org.apache.jmeter.protocol.http.util.HTTPArgument.getEncodedValue(HTTPArgument.java:236)
at org.apache.jmeter.protocol.http.util.HTTPArgument.getEncodedValue(HTTPArgument.java:217)
at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sendPostData(HTTPHC4Impl.java:1294)
at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.handleMethod(HTTPHC4Impl.java:557)
at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:375)
at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:74)
at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1146)
at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1135)
at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:465)
at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:410)
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:241)
at java.lang.Thread.run(Unknown Source)
答案 0 :(得分：3)
如果CSV_Challenges_Dataset是文件名，那么您可以按如下方式直接访问它：
${__FileToString(C:\\Users\\prasad\\Office\\SSP\\16.48\\sprint3\\CSV_Challenges_Dataset.txt,,)}
如果CSV_Challenges_Dataset是实际文件名，请不要将其包含在eval方法中。
如果CSV_Challenges_Dataset是变量，那么您要么未在JMeter测试计划中定义（设置值）。来自日志很明显，您没有定义值CSV_Challenges_Dataset。
Could not read file: C:\Users\prasad\Office\SSP\16.48\sprint3\${CSV_Challenges_Dataset}.txt File
如果已定义，CSV_Challenges_Dataset应该已被实际值替换。
添加Debug sampler和View Results Tree，以了解运行时CSV_Challenges_Dataset的值。
答案 1 :(得分：0)
最有可能的原因是您的${CSV_Challenges_Dataset}变量未设置。在此函数之前的某处添加Debug Sampler并仔细检查变量值是否已设置并解析为文件名。您可以使用View Results Tree侦听器查看JMeter变量名称和值。有关深入了解JMeter测试脚本失败的详细信息，请参阅How to Debug your Apache JMeter Script文章。
以防万一，您不需要将${CSV_Challenges_Dataset}变量包装到__eval（）函数中，__ FileToString（）函数足够智能来解析变量。