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Open eclipse, create a new maven project, and introduce the jmeter core jar package into pom:

Org.apache.jmeter ApacheJMeter_core 3.2 org.apache.jmeter ApacheJMeter_functions 3.2

1. Create a new package com.mytest.functions, and the package name should contain functions, because jmeter.properties is configured for this block, so you can see the classfinder.functions.contain=.functions of the file.

two。 Create a new class under the package and inherit AbstractFunction, overriding all the methods of the class, as follows:

Package com.mytest.functions;import java.io.FileInputStream;import java.io.InputStream;import java.util.Collection;import java.util.LinkedList;import java.util.List;import org.apache.jmeter.engine.util.CompoundVariable;import org.apache.jmeter.functions.AbstractFunction;import org.apache.jmeter.functions.InvalidVariableException;import org.apache.jmeter.samplers.SampleResult;import org.apache.jmeter.samplers.Sampler;import org.apache.jmeter.threads.JMeterVariables;import sun.misc.BASE64Encoder Description of public class MyBase64 extends AbstractFunction {/ / Custom function private static final List desc = new LinkedList (); static {desc.add ("picture path");} desc.add ("variable after picture base64"); private static final String KEY = "_ _ MyBase64"; / / variable private Object [] values that holds the value of the passed parameter / / description parameter public List getArgumentDesc () {/ / TODO Auto-generated method stub return desc; @ Override / / public synchronized String execute (SampleResult arg0, Sampler arg1) throws InvalidVariableException {JMeterVariables localJMeterVariables = getVariables (); String str1 = ((CompoundVariable) this.values [0]) .execute (); String str2 = getImgBase64 (str1) If ((localJMeterVariables! = null) & & (this.values.length > 1)) {String str3 = ((CompoundVariable) this.values [1]) .execute () .trim (); localJMeterVariables.put (str3, str2);} return str2; public String getReferenceKey () {/ / provide the name return KEY displayed by the jmeter function helper Public synchronized void setParameters (Collection arg0) throws InvalidVariableException {/ / check the number of parameters. There are two methods supported. For specific usage, please see api: / * protected void checkParameterCount (Collection parameters, int count) throws InvalidVariableException Utility method to check parameter counts. Parameters: parameters-collection of parameters count-number of parameters expected * * /-* int min Int max) min-minimum number of parameters allowed max-maximum number of parameters allowed / / checkParameterCount (arg0, 1) CheckParameterCount (arg0, 1,2); / / store parameter values in variables this.values = arg0.toArray (); public String getImgBase64 (String filePath) {InputStream in = null; byte [] data = null; String result = null; try {in = new FileInputStream (filePath); data = new byte [in.available ()] In.read (data); in.close (); BASE64Encoder encoder = new BASE64Encoder (); result = encoder.encode (data);} catch (Exception e) {/ / TODO Auto-generated catch block e.printStackTrace (); return result;}

3. Since the class I wrote does not rely on third-party jar packages, the introduced jmeter core packages are all included with jmeter, so directly export the above class to a jar package and put the jar under apache-jmeter-3.2\ lib\ ext in the jmeter installation directory.

4. Restart jmeter, open the function helper, and you can see the following figure:

5. Let's test whether this function can be used. Create a new http request and add ${_ MyBase64 (D:\\ aa.jpg,imgresult)} and ${imgresult} to the post request as shown below. Note that ${_ MyBase64 (D:\\ aa.jpg,imgresult)} must be on it.

6. After running it, you can see that it has been successful.

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