英文:
How to calculate a variable and send it as a header in jmeter
问题
我正在尝试计算一个变量的值，以便将该值作为JMETER头部发送，类似于这样：```javaDate timestamp = new Date();String now = DateUtils.toIso8601Date(timestamp);vars.put("timestamp", "hello");
我将此代码放在一个beanshell预处理器中，然后在头部管理器中使用以下语法，希望将时间戳作为头部发送：
然而，变量的值并未在头部替换。在接下来的步骤中，我希望能够使用代码来计算HMAC签名并将其作为头部发送。在jmeter中是否有任何方法可以实现这一点？可以使用脚本来计算头部值，然后发送吗？我在postman中使用了预先脚本来做到这一点，但在jmeter中我没有看到类似的机制。
谢谢
<details><summary>英文:</summary>I am trying to calculate a variable value in order to send that value as a header in JMETER, something like this:
Date timestamp = new Date();
String now = DateUtils.toIso8601Date(timestamp);
vars.put("timestamp", "hello");
I put this code in a beanshell preprocessor and then used the following syntax in a header manager hoping to send the timestamp as a header:[![enter image description here][1]][1]However the value of the variable is not being replaced in the header. Further down the line I want to be able to use code to calculate an HMAC signature and send it as a header. Is there any way to do this in jmeter? use a script to calculate a header value and then send it? I've done this in postman with the pre-req scripts but I don't see a similar mechanism in jmeter.Thanks[1]: https://i.stack.imgur.com/aFARX.png</details># 答案1**得分**: 11. 这个 `DateUtils.toIso8601Date` 函数是我不熟悉的，它既不在[Java SDK][1]中，也不在随JMeter一起提供的库中。如果你正在使用一个自定义库来提供这个函数，你需要：- 将它复制到[JMeter类路径][2]- 重新启动JMeter以加载它- 添加一个[导入][3]语句来加载它2. [自从JMeter 3.1版本开始，推荐使用JSR223测试元素和Groovy语言进行脚本编写][4]，特别是涉及到“重型”任务，比如加密操作时，请考虑迁移。更多信息：[Beanshell vs. JSR223 vs. Java For JMeter: 完整对比][5][1]: https://docs.oracle.com/en/java/javase/11/docs/api/index.html[2]: https://jmeter.apache.org/usermanual/get-started.html#classpath[3]: https://docs.oracle.com/javase/tutorial/java/package/usepkgs.html[4]: https://jmeter.apache.org/usermanual/best-practices.html#bsh_scripting[5]: https://www.blazemeter.com/blog/beanshell-vs-jsr223-vs-jmeter<details><summary>英文:</summary>1. This `DateUtils.toIso8601Date` function is not something I'm aware of, it's neither present in [Java SDK][1] nor in libraries which come with JMeter. If you're using a custom library which provides this function you will need to:- copy it to [JMeter Classpath][2]- restart JMeter to pick it up- add an [import][3] statement to load it2. [Since JMeter 3.1 it's recommended to use JSR223 Test Elements and Groovy language for scripting][4] especially when it comes to "heavy" tasks like cryptographic operations so consider migrating. More information: [Beanshell vs. JSR223 vs. Java For JMeter: Complete Showdown][5][1]: https://docs.oracle.com/en/java/javase/11/docs/api/index.html[2]: https://jmeter.apache.org/usermanual/get-started.html#classpath[3]: https://docs.oracle.com/javase/tutorial/java/package/usepkgs.html[4]: https://jmeter.apache.org/usermanual/best-practices.html#bsh_scripting[5]: https://www.blazemeter.com/blog/beanshell-vs-jsr223-vs-jmeter</details>
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