Groovy, hello world.-优快云博客

下载了eclipse groovy plugin，成功安装后准备写一个hello world，发现了两个问题。

1. 第一个问题是这样的。参看这个网页。

http://groovy.codehaus.org/Eclipse+Plugin

网页中提到需要将eclipse java project的default output folder设置为bin-groovy。详细描述见下面英文。

Create a Groovy Project

To create a basic Groovy project in Eclipse perform the following steps:

Go to: File -> New -> Project
Select Java Project and press Next
In the Project Name field enter the name of your project (GroovyJava for this example)
Under Project Layout select Create separate source and output folders and press Finish
In the Package Explorer find the newly created project, right click, and select Groovy -> Add Groovy Nature

So far you should have a src folder, a bin-groovy folder, and several libraries. There is also a bin folder that was created by Eclipse, but is hidden due to exclusion filters. The next steps are needed to make the bin-groovy folder the default output folder, and to connect it to the src folder so that the debugger will know where to find the associated source and classes:

In the Package Explorer, right click on the "GroovyJava" project, and select: Build Path -> Configure Build Path
Select the Source tab and then use the Browse button to change the Default Output Folder from bin to bin-groovy
Press OK, OK

This will expose the bin folder in the Package Explorer. I'm not sure why the plugin creates a bin-groovy directory. Perhaps there are other "bin" files that are best kept separate from the Groovy classes, or perhaps one of the original versions of Eclipse didn't create a "bin" directory automatically. Some day when someone has a clear idea of the usefulness of this, or lack thereof, we can clean up my instructions.

2. 第二个问题是插件的问题。写了一个简单的脚本后，运行的时候会抛出异常。

这是因为在点击【右键工程文件夹-->Groovy-->Import Groovy Libs into Project】按钮的时候，并没有将Groovy需要的jar包拷贝到工程的classpath中，手动将%Groovy_home%/lib路径下的jar包拷贝到工程中，并设置为classpath。运行hello world，一切搞定！～