Generating JAVA files and using them at runtime

问题

I'm trying the following, suggested by Cedric Beust in some other thread.

You could do this yourself as a pre-test task: implement a code generator that takes the information in XML form, grab the corresponding Java source file and generate a TestNG source file with all the annotations placed in the right locations. And then you run TestNG on that file.

I have no clue with code generation. Can someone guide me in the right direction? Some simple examples would be great.

Update: This is the template of what I would like to generate.

public class <tobeReadFromConfigFile>
{
  @Test(groups="to be read from config file")
  public void <tobereadfromconfigfile>{
     //to be read from config file(Name of function to call)
     //to be read from config file(Name of function to call)
     //to be read from config file(Name of function to call)
  }
  .
  .
  .
}

The code inside function will be just function calls, which has to be read and copied exactly from config file.

回答1:

A FreeMarker template would look something like this:

public class ${className} {
    @Test(groups="${testGroups}")
    public void ${testMethodName}() {
        <#list methods as m>
        ${m}
        </#list>   
    }
}

It would be filled from a context, essentially a hashmap with className, testGroups, etc. entries, that would be read from your XML file. methods would be a Collection (like a list), also read from the XML file.

There are many other templating libraries, of course; this is just an example.

FreeMarker

回答2:

I have written an eclipse plugin that uses freemarker templates and provides the context of named java classes as ICompilationUnit from org.eclipse.jdt.core. You can check it out at https://github.com/karajdaar/templator

来源：https://stackoverflow.com/questions/11040968/generating-java-files-and-using-them-at-runtime

标签

java

testing

code-generation

testng