JMeter：使用Java类为自定义标头生成值

Question

i try to test the performance for our api which has a request-limiter (100requets in 100sec otherwise the ip is blocked). You can avoid this with a custom header. The value for this header is generate by a java class.

With jruby i can use "require" and "import" too use the class.

How can i do this for JMeter?

Additional infos: the header value is dynamic -> for each request it has to be generated. To call HttpPwd.genPwd() two *.jar files are needed

Answer 1

This is how to proceed :

• Put the 2 Jars in jmeter/lib folder

• Put groovy-all.jar in jmeter/lib

• Use a JSR223 Preprocessor + Groovy

• Put in the Preprocessor the following code:

import xxxxxx; // where xxxx is the full name of the HttpPwd class

vars.put("header", HttpPwd.genPwd());

• On your request add a HeaderManager as a child and in its content put:

HeaderName (I don't know what it is) : ${header}

Answer 2

In your JMeter project navigate to Thread Group > HTTP Request . You can set your request parameters there.

Answer 3

Here is the way of implementing this via JMeter __Beanshell function

Assuming that you're having following logic for generating custom header:

package custom.header;

public class HttpPwd {

public static String getPwd() {
    return String.valueOf(System.currentTimeMillis());
}
}

Which is accessible from some jar called "customheader.jar"

And you want to add a header named "MyHeader" to your request

1. Put customheader.jat to lib/ext folder of your jmeter installation. (or to location under search_paths or user.classpath if you have overriden these properties in your user.properties file)
2. Create a Thread Group
3. Add ie HTTP Request to Thread Group
4. In HTTP Request put Server Name or IP to be ie "google.com", Path - /, and add a parameter "q" with a value of "test". Actually it doesn't matter.
5. Add HTTP Header Manager AS A CHILD of HTTP Request
6. Add Name as MyHeader and Value - "${__BeanShell(import custom.header.*;HttpPwd.getPwd();)}"
7. Add View Results Tree listener after HTTP Request
8. Save and run

You should see something like:

GET http://www.google.com/?q=test

[no cookies]

Request Headers:
Connection: keep-alive
MyHeader: 1382360571781
Host: www.google.com
User-Agent: Apache-HttpClient/4.2.3 (java 1.5)

Mention MyHeader presense and value