1, Foreword

The interface request body has a sign signature parameter. The sign signature is generated by splicing the request parameters and finally md5 encrypting the request parameters after removing the sign parameter from the request body

Using jmeter to test the interface, we hope to modify the value of the sign parameter in the post body to the value of the signature before the request

2, sign signature

The implementation of signature is to add BeanShell preprocessor, generate sign value, set a variable, and then reference the variable in the requested body
Refer to the previous article: https://blog.csdn.net/x2waiwai/article/details/122843324

Next, let's talk about another implementation method. In the BeanShell preprocessor, first obtain the body of the request, sign, re assign the sign parameter, and then send a new request body

The overall implementation idea is as follows
1. Get the request body value first
2.body to JSONObject object
3. According to the sign signature rules, traverse the values of JSONObject objects, and then sort them
4. After sorting, splice the signature key to generate a new string
5.md5 encryption to obtain the sign signature value
6. Add the sign attribute to the jsonObject object
7.JSONObject to json string
8. Reassign the requested body

Add the preprocessing of the above functions before sending the request to realize the automatic signature of the body parameter

3, BeanShell preprocessor

HTTP request samples in the body can be signed without the sign parameter
Add BeanShell preprocessor
The overall code is implemented as follows

import org.apache.jmeter.config.Arguments;
import org.apache.jmeter.config.Argument;
import org.json.JSONObject;
import org.json.JSONArray;
import org.apache.commons.codec.digest.DigestUtils;    //Import md5 encrypted package


Arguments arguments =  sampler.getArguments();
Argument arg = arguments.getArgument(0);
//  1. Get the request body value
String body = arg.getValue();
log.info(body);

// 2.body to json object
JSONObject jsonObject = new JSONObject(body);
String user = jsonObject.getString("username");
String psw = jsonObject.getString("password");
log.info(user);

//3. The obtained json object removes the parameters of sign itself, splicing parameters, sorting and splicing key
// This section will not be implemented automatically with java code for the time being
String a = "username" + user;  
log.info(a);
String b = "password" + psw;
log.info(b);
String key = "12345678";
log.info(key);

// 4. Concatenate signature key string after sorting
c = b+a+key;
log.info(c);

// 5.md5 encryption to obtain the sign signature value
String md5_after = DigestUtils.md5Hex(c);   // md5 encryption
log.info(md5_after);

// 6. Add the sign parameter to the jsonObject object
jsonObject.put("sign", md5_after);

// 7.JSONObject to string
String  postData = jsonObject.toString();
log.info(postData);

// 8. Reassign the body parameter of the request
arg.setValue(postData);

Partial log after operation

2021-01-04 22:31:15,783 INFO o.a.j.t.JMeterThread: Thread started: Thread group 1-1
2021-01-04 22:31:15,786 INFO o.a.j.u.BeanShellTestElement: {"username": "test", 
"password": "123456", 
"mail": ""}
2021-01-04 22:31:15,788 INFO o.a.j.u.BeanShellTestElement: test
2021-01-04 22:31:15,788 INFO o.a.j.u.BeanShellTestElement: usernametest
2021-01-04 22:31:15,788 INFO o.a.j.u.BeanShellTestElement: password123456
2021-01-04 22:31:15,789 INFO o.a.j.u.BeanShellTestElement: 12345678
2021-01-04 22:31:15,790 INFO o.a.j.u.BeanShellTestElement: password123456usernametest12345678
2021-01-04 22:31:15,791 INFO o.a.j.u.BeanShellTestElement: 1aca01806e93bb408041965a817666af
2021-01-04 22:31:15,791 INFO o.a.j.u.BeanShellTestElement: {"password":"123456","mail":"","sign":"1aca01806e93bb408041965a817666af","username":"test"}
2021-01-04 22:31:15,929 INFO o.a.j.t.JMeterThread: Thread is done: Thread group 1-1

4, View result tree

View the result tree and run the result request. The body will bring the sign value
The response was successful

Thank everyone who reads my article carefully!!! If the following materials are available, they can be taken away directly:

1. Complete project source code and environment necessary for self-study development or testing

2. All templates in test work (test plan, test case, test report, etc.)

3. Classic interview questions of software testing

4. Python/Java automated test practice pdf

5. Jmeter/postman interface test full set of video acquisition

I have personally sorted out some technical materials of my software testing career in recent years, including e-books, resume modules, various work templates, interview scriptures, self-study projects, etc. If you encounter problems in your study or work, you can directly Click this link If you enter the group and ask, there will also be great gods in the group to help answer, or you can add the group number manually 743262921 Remarks 222