public Arguments getDefaultParameters();设置可用参数及的默认值；
public void setupTest(JavaSamplerContext arg0)：每个线程测试前执行一次，做一些初始化工作；
public SampleResult runTest(JavaSamplerContext arg0)：开始测试，从arg0参数可以获得参数值；
public void teardownTest(JavaSamplerContext arg0)：测试结束时调用；

package com.test.webservice;public class Hello {public String sayHello(){return "Hello";}public String sayHelloToPerson(String s){if(s == null || s.equals(""))s = "nobody";return (new StringBuilder()).append("Hello ").append(s).toString();}public int sum(int a,int b){return a+b;}
}

package com.test.webservice;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;
import com.test.webservice.Hello;public class perftest extends AbstractJavaSamplerClient {private String a;private String b;/** Holds the result data (shown as Response Data in the Tree display). */private String resultData;// 这个方法是用来自定义java方法入参的。// params.addArgument("num1","");表示入参名字叫num1，默认值为空。//设置可用参数及的默认值；public Arguments getDefaultParameters() {Arguments params = new Arguments();params.addArgument("num1", "");params.addArgument("num2", "");return params;}//每个线程测试前执行一次，做一些初始化工作；public void setupTest(JavaSamplerContext arg0) {}//开始测试，从arg0参数可以获得参数值；public SampleResult runTest(JavaSamplerContext arg0) {a = arg0.getParameter("num1");b = arg0.getParameter("num2");SampleResult sr = new SampleResult();sr.setSampleLabel( "Java请求哦");try {sr.sampleStart();// jmeter 开始统计响应时间标记Hello test = new Hello();// 通过下面的操作就可以将被测方法的响应输出到Jmeter的察看结果树中的响应数据里面了。resultData = String.valueOf(test.sum(Integer.parseInt(a), Integer.parseInt(b)));if (resultData != null && resultData.length() > 0) {sr.setResponseData("结果是："+resultData, null);sr.setDataType(SampleResult.TEXT);}// System.out.println(resultData);sr.setSuccessful(true);} catch (Throwable e) {sr.setSuccessful(false);e.printStackTrace();} finally {sr.sampleEnd();// jmeter 结束统计响应时间标记}return sr;}//测试结束时调用；public void teardownTest(JavaSamplerContext arg0) {// System.out.println(end);// System.out.println("The cost is"+(end-start)/1000);}// main只是为了调试用，最后打jar包的时候注释掉。/*public static void main(String[] args) { // TODO Auto-generated method stubArguments params = new Arguments(); params.addArgument("num1", "1");//设置参数，并赋予默认值1 params.addArgument("num2", "2");//设置参数，并赋予默认值2JavaSamplerContext arg0 = new JavaSamplerContext(params); perftestbbb test = new perftestbbb(); test.setupTest(arg0); test.runTest(arg0);test.teardownTest(arg0); }*/
}

JMeter默认实现了两个Java Request Sampler：SleepTest Sampler和JavaTest Sampler。

JavaTest Sampler不向服务器发送数据请求，一般被用作调试目的使用。