导入 Java 库 groovy
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Import Java library groovy
提问by Mattes
i want to use a method defined in the apache.common.net library in my groovy-Script.
我想在我的 groovy 脚本中使用 apache.common.net 库中定义的方法。
I first downloaded and included it in my config:
我首先下载并将其包含在我的配置中：
this.class.classLoader.rootLoader.addURL(new URL("file:///${currentDir}/lib/commons-net-3.3.jar"))
Afterwards i try to use it in my groovy-script like this (to make it clear: the import pimpim.* imports also the classLoader above):
之后，我尝试在我的 groovy 脚本中使用它，如下所示（为了清楚起见：import pimpim.* 还导入了上面的 classLoader）：
import pimpim.*
import org.apache.commons.net.ftp.*
def pm = PM.getInstance("test")
public class FileUploadDemo {
public static void main(String[] args) {
FTPClient client = new FTPClient();
I also tried several annotations for the "import" like
我还为“导入”尝试了几个注释，例如
import org.apache.commons.net.ftp.FTPClient
But i keep getting this error:
但我不断收到此错误：
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
Y:\pimconsole\scripts\ftp.gy: 11: unable to resolve class FTPClient
@ line 11, column 15.
FTPClient client = new FTPClient();
What did i miss? Sorry, i am still new to groovy :/
我错过了什么？抱歉，我对 groovy 还是个新手：/
采纳答案by tim_yates
So, you can add it to the classpath when you start up your script;
因此，您可以在启动脚本时将其添加到类路径中；
groovy -cp .;lib/commons-net-3.3.jar ftp.gy
Or, you can add a @Grabannotation to your script, and Groovy will download the dependency and add it to the classpath before running (but this can not work if your scripts are executed on a box with no access to maven);
或者，您可以@Grab在脚本中添加注释，Groovy 会在运行之前下载依赖项并将其添加到类路径中（但如果您的脚本在无法访问 maven 的机器上执行，则这将不起作用）；
@Grab('commons-net:commons-net:3.3')
import org.apache.commons.net.ftp.*
...rest of your script...
Or the classpath hacking route you have above shouldwork if you try:
或者，如果您尝试，上面的类路径黑客路线应该可以工作：
this.getClass().classLoader.rootLoader.addURL(new File("lib/commons-net-3.3.jar").toURL())
