jmeter添加自定义扩展函数之if判断

1，打开eclipse,新建maven工程，在pom中引用jmeter核心jar包，具体请看---https://www.cnblogs.com/guanyf/p/10863033.html---，这里就不再赘述

2，代码如下：

package com.mytest.functions;



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 java.util.Collection;

import java.util.LinkedList;

import java.util.List;



public class If extends AbstractFunction {

    private static final List<String> desc = new LinkedList<String>();

    private static final String KEY = "__if";



    static {

        desc.add("Actual value");

        desc.add("Expected value");

        desc.add("Result if actual == expected");

        desc.add("Result if actual != expected");

        desc.add("Name of variable in which to store the result (optional)");

    }



    private Object[] values;



    public If() {

    }



    @Override

    public synchronized String execute(SampleResult previousResult, Sampler currentSampler)

            throws InvalidVariableException {



        String actual = getParameter(0);

        String expected = getParameter(1);



        String result = null;

        if (actual.equals(expected)) {

            result = getParameter(2).toString();

        } else {

            result = getParameter(3).toString();

        }



        JMeterVariables vars = getVariables();

        if (vars != null && values.length > 4) {

            String varName = getParameter(4).trim();

            vars.put(varName, result);

        }



        return result;

    }



    @Override

    public synchronized void setParameters(Collection<CompoundVariable> parameters) throws InvalidVariableException {

        checkMinParameterCount(parameters, 4);

        values = parameters.toArray();

    }



    @Override

    public String getReferenceKey() {

        return KEY;

    }



    @Override

    public List<String> getArgumentDesc() {

        return desc;

    }



    private String getParameter(int i) {

        return ((CompoundVariable) values[i]).execute();

    }

}