jmeter添加java请求和if控制器

package jmeter_sample;

import org.apache.jmeter.config.Arguments;  
import org.apache.jmeter.protocol.java.sampler.AbstractJavaSamplerClient;  
import org.apache.jmeter.protocol.java.sampler.JavaSamplerContext;  
import org.apache.jmeter.samplers.SampleResult;


public class PerformanceTest extends AbstractJavaSamplerClient
{
    
    private static long start = 0;
    private static long end =0;
    private  String a,b, result;
    
    public void setupTest(JavaSamplerContext arg0)
    {
        start = System.currentTimeMillis();
    }
    
    public void teardownTest(JavaSamplerContext arg0)
    {
        end = System.currentTimeMillis();
        System.err.println("cost time" + (end-start)/1000);
    }
    
    public Arguments getDefaultParameters()
    {
        Arguments args = new Arguments();
        args.addArgument("num1","");
        args.addArgument("num2","");
        return args;
    }
    
    private static int sum(int a, int b)
    {return a+b;}
    
    public SampleResult runTest(JavaSamplerContext arg0)
    {
        SampleResult sr = new SampleResult();
        a = arg0.getParameter("num1");
        b = arg0.getParameter("num2");
        sr.setSampleLabel("hui");
        try
        {
            sr.sampleStart();
            result = String.valueOf( sum(Integer.parseInt(a),Integer.parseInt(b)));
            if(result !=null &&result.length()>0)
            {
                sr.setResponseData("结果是 "+result,null);
                sr.setDataType(SampleResult.TEXT);
            }
            sr.setSuccessful(true);
            sr.sampleEnd();
        }
        catch(Exception e)
        {    e.printStackTrace();}
        return sr;
    }
    
    public static void main(String[] args)
    {
        System.out.print("hello");
    }
}