JMeter Learning (18) JMeter Test Java (ii)

Instance:

The service is: the input two parameters via IO to the file;

1. Open MyEclipse, write Java codeService:

 Packagetest;ImportJava.io.File;ImportJava.io.PrintWriter; Public classOutputservice { Public Static voidOutput (String filename,intAintbthrowsException {PrintWriter out=NewPrintWriter (NewFile (filename)); Out.write (A+ ":" +b);    Out.close (); }}

Test class:

 Packagetest;Importorg.apache.jmeter.config.Arguments;Importorg.apache.jmeter.protocol.java.sampler.JavaSamplerClient;ImportOrg.apache.jmeter.protocol.java.sampler.JavaSamplerContext;ImportOrg.apache.jmeter.samplers.SampleResult;//The service is: the input two parameters via IO to the file; Public classPerformencetestImplementsjavasamplerclient {Privatesampleresult results; PrivateString A; PrivateString B; PrivateString filename; //Set the parameters that are passed in, you can set multiple, and the parameters you have set are displayed in the JMeter parameter list     PublicArguments getdefaultparameters () {Arguments params=NewArguments (); Params.addargument ("FileName", "0");//set the parameter and give the default value 0Params.addargument ("A", "0");//set the parameter and give the default value 0Params.addargument ("B", "0");//set the parameter and give the default value 0        returnparams; }    //initialization method, which is executed only once per thread at the actual runtime and executed before the test method runs     Public voidsetuptest (Javasamplercontext arg0) {results=NewSampleresult (); }    //The loop body of the test execution, which executes multiple times depending on the number of threads and the number of cycles     Publicsampleresult runtest (Javasamplercontext arg0) {b= Arg0.getparameter ("B");//get the parameter values set in JMeterA = Arg0.getparameter ("a");//get the parameter values set in JMeterfilename = arg0.getparameter ("filename");//get the parameter values set in JMeterResults.samplestart ();//jmeter Start statistic response time stamp        Try{outputservice Test=NewOutputservice ();            Test.output (filename, Integer.parseint (a), Integer.parseint (b)); Results.setsuccessful (true); //The object being measured is called}Catch(Throwable e) {results.setsuccessful (false);        E.printstacktrace (); } finally{results.sampleend ();//JMeter End statistic response time stamp        }        returnresults; }    //The end method, which is executed only once per thread at the actual run time and executed after the test method has finished running     Public voidteardowntest (Javasamplercontext arg0) {}/*Public static void Main (string[] args) {//TODO auto-generated method stub Arguments params = new A        Rguments (); Params.addargument ("A", "0");//Set the parameter and give the default value 0 params.addargument ("b", "0");//Set the parameter and give the default value of 0 params.addargument        ("filename", "abc.txt");        Javasamplercontext arg0 = new Javasamplercontext (params);        Performencetest test = new Performencetest ();        Test.setuptest (arg0);        Test.runtest (arg0);    Test.teardowntest (arg0); }    */}

Build the jar package and place it in the Jmeter_home/lib/ext directory.

2. Set JMeterAfter opening jmeter as an administrator and creating a Java request, the structure looks like this: A new test class was found in Java requests: We found three parameters in the JMeter: here we use two functions: (1) _random generates random integers; (2) _ RandomString generate random strings, set the number of concurrent threads in a thread group to 5, and run after saving; aggregated reports:

As a result, 5 files were successfully generated:

3. Problems encountered

3.1 Export for jar file causes the class name of Java request not to be found; 3.2 JMeter Java.lang.OutOfMemoryError:PermGen space problem: Modify in Jmeter.bat: Set H eap=-xms512m-xmx1024m set new=-xx:newsize=128m-xx:maxnewsize=128m set SURVIVOR=-XX:SURVIVORRATIO=8-XX: targetsurvivorratio=50% set tenuring=-xx:maxtenuringthreshold=2 Set rmigc=-dsun.rmi.dgc.client.gcinterval=600000- dsun.rmi.dgc.server.gcinterval=600000 set perm=-xx:permsize=256m-xx:maxpermsize=512m3.3 JMeter needs to be opened as an administrator, otherwise it will appear:

JMeter Learning (18) JMeter Test Java (ii)