grails调用groovy脚本

参考文章：

http://www.poorren.com/java-groovy-dynamic-algorithm/

http://www.cnblogs.com/jizha/p/5027695.html?utm_source=tuicool&utm_medium=referral

grails本身就是使用groovy开发的，所以调用groovy脚本也是很方便的。

我封装好的类如下：

import grails.transaction.Transactional

@Transactional
class GroovyScriptUtilsService {
    def grailsApplication
    static String scriptRootDir = []    //  脚本文件所在目录
    static GroovyScriptEngine groovyScriptEngine


    def init(){
        scriptRootDir = getScriptDir()
        groovyScriptEngine = new GroovyScriptEngine(scriptRootDir)
        println("scriptRootDir=${scriptRootDir}")
    }

    /**
     *  调用Groovy脚本文件中的指定方法
     * @param scriptFileName        脚本文件名称，如：aaa.groovy
     * @param methodName        方法名称
     * @param args                   方法参数
     * @return
     */
    @Transactional
    def invokeMethod(String scriptFileName,String methodName,Object args = null) throws Exception{
        if(!groovyScriptEngine){
            init()
        }
        def ret = null
        Class scriptClass = null
        GroovyObject scriptInstance = null
        try {
            scriptClass = groovyScriptEngine.loadScriptByName(scriptFileName)
            scriptInstance = (GroovyObject)scriptClass.newInstance()
            ret = scriptInstance.invokeMethod(methodName,args)
        }
        catch (Exception ex) {
           ex.printStackTrace()
        }
        return ret;
    }


    String getScriptDir(){
        return getRealPath("groovyScript")
    }

    String getRealPath(String relativePath){
        String result
        try {
            result = grailsApplication.getMainContext().servletContext.getRealPath("/") + relativePath
            File dirDst = new File(result)
            if (!dirDst.exists()) {
                dirDst.mkdirs()
            }
        }
        catch (Exception ex) {
            ex.printStackTrace()
        }
        return result
    }

}

调用例子：

def ScrapeService scrapeService

def result = groovyScriptUtilsService.invokeMethod("test.groovy","hello");
? println("result=${result}")


? ? ? ? Object args = ["ok"] ?// ?多个参数时：Object args = ["ok","11","222"]
? ? ? ? result = groovyScriptUtilsService.invokeMethod("test.groovy","hello",?args);
? ? ? ? println("result=${result}")

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脚本文件test.groovy：

def hello(){ ? ? return "无参hello" } def hello(str){ ? ? return "有参hello,参数=${str}" }