生成JAVA文件并在运行时使用它们 [英] Generating JAVA files and using them at runtime

问题描述

我正在尝试Cedric Beust在其他主题中提出的以下建议。

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

您可以自己做这件事作为预测试任务：实现一个代码生成器
，以XML格式获取信息，抓取相应的Java
源文件并生成TestNG源文件，并将所有注释
放在正确的位置。然后在该文件上运行TestNG。

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.

我对代码生成一无所知。有人可以指引我正确的方向吗？一些简单的示例就很好。

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

更新：这是我要生成的内容的模板。

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)
  }
  .
  .
  .
}

函数内部的代码只是函数调用，必须对其进行读取和

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

推荐答案

FreeMarker模板如下所示：

A FreeMarker template would look something like this:

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

它将从上下文填充，本质上是一个哈希图带有 className ， testGroups 等条目的条目，这些条目将从XML文件中读取。 方法是 Collection （如列表），也可以从XML文件中读取。

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.

当然，还有许多其他模板库。这只是一个例子。

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

FreeMarker

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