Calling Groovy from Java

Need to add Groovy-2.4.3.jar to Classpath

One: Execute groovy code in Java with Groovyclassloader

Calculatemax.groovy

1 class calculatemax{2    def Integer getmax (List values) {3        Values.max (); 4     }5 }

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Usegroovyclassloader.java

1  Packagegroovy_java_1;2 3 ImportJava.io.File;4 Importjava.util.ArrayList;5 6 ImportGroovy.lang.GroovyClassLoader;7 ImportGroovy.lang.GroovyObject;8 9  Public classUsegroovyclassloader {Ten      Public Static voidMain (string[] args) { OneGroovyclassloader loader =NewGroovyclassloader (); A         Try{ -class<?> Groovyclass = Loader.parseclass (NewFile ("Src/groovy_java_1/calculatemax.groovy")); -Groovyobject Groovyobject =(Groovyobject) groovyclass.newinstance (); thearraylist<integer> numbers =NewArraylist<integer>(); -Numbers.add (NewInteger (1)); -Numbers.add (NewInteger (10)); -object[] arguments ={numbers}; +Object value = Groovyobject.invokemethod ("Getmax", arguments); -             assertValue.equals (NewInteger (10)); + System.out.println (value); A}Catch(Exception e) { at e.printstacktrace (); -         } -     } -  -}

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Two: Execute groovy code in Java with Groovyshell

Usegroovyshell.java

1  PackageGroovy_java_0;2 3 ImportJava.math.BigDecimal;4 5 Importgroovy.lang.Binding;6 ImportGroovy.lang.GroovyShell;7 8  Public classUsegroovyshell {9      Public Static voidMain (string[] args) {TenBinding binding =NewBinding (); OneBinding.setvariable ("X", 2.4); ABinding.setvariable ("Y", 8); -Groovyshell Shell =NewGroovyshell (binding); -Object value = shell.evaluate ("X+y"); the         assertValue.equals (NewBigDecimal (10.4)); -     } -  -}

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Three: Execute groovy code in Java with Groovyscriptengine

Hello.groovy

1 def hellostatement = "Hello ${name}"

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Usegroovyscriptengine.java

1  Packagegroovy_java_2;2 3 Importgroovy.lang.Binding;4 ImportGroovy.util.GroovyScriptEngine;5 6  Public classUsegroovyscriptengine {7      Public Static voidMain (string[] args) {8         Try {9String[] Roots =Newstring[]{"src/groovy_java_2"};//Setting the root directoryTenGroovyscriptengine GSE =NewGroovyscriptengine (roots);//Initialize engine One              ABinding binding =NewBinding (); -Binding.setvariable ("name", "Gweneth"); -              theObject output = Gse.run ("Hello.groovy", binding); - System.out.println (output); -             assertOutput.equals ("Hello Gweneth"); -  +}Catch(Exception e) { -             //Todo:handle Exception + e.printstacktrace (); A         } at     } -  -}

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Calling Groovy from Java