jmeter添加自定义扩展函数之大写转换小写

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 LowerCase extends AbstractFunction {

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

    private static final String KEY = "__lowercase";

    static {

        desc.add("String to convert to lowercase");

        desc.add("Name of variable in which to store the result (optional),The author is guanyf");

    }

    private Object[] values;

    /**

     * No-arg constructor.

     */

    public LowerCase() {

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public synchronized String execute(SampleResult previousResult, Sampler currentSampler)

            throws InvalidVariableException {

        JMeterVariables vars = getVariables();

        String res = ((CompoundVariable) values[0]).execute().toLowerCase();

        if (vars != null && values.length > 1) {

            String varName = ((CompoundVariable) values[1]).execute().trim();

            vars.put(varName, res);

        }

        return res;

    }

    /**

     * {@inheritDoc}

     */

    @Override

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

        checkMinParameterCount(parameters, 1);

        values = parameters.toArray();

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public String getReferenceKey() {

        return KEY;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public List<String> getArgumentDesc() {

        return desc;

    }

}