需要将groovy-2.4.3.jar加入到classpath中
一:在java中用GroovyClassLoader执行groovy代码
CalculateMax.groovy
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1 class CalculateMax{ 2 def Integer getMax(List values){ 3 values.max(); 4 } 5 }
UseGroovyClassLoader.java
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1 package groovy_java_1; 2 3 import java.io.File; 4 import java.util.ArrayList; 5 6 import groovy.lang.GroovyClassLoader; 7 import groovy.lang.GroovyObject; 8 9 public class UseGroovyClassLoader { 10 public static void main(String[] args){ 11 GroovyClassLoader loader = new GroovyClassLoader(); 12 try{ 13 Class<?> groovyClass = loader.parseClass(new File("src/groovy_java_1/CalculateMax.groovy")); 14 GroovyObject groovyObject = (GroovyObject) groovyClass.newInstance(); 15 ArrayList<Integer> numbers = new ArrayList<Integer>(); 16 numbers.add(new Integer(1)); 17 numbers.add(new Integer(10)); 18 Object[] arguments = {numbers}; 19 Object value = groovyObject.invokeMethod("getMax", arguments); 20 assert value.equals(new Integer(10)); 21 System.out.println(value); 22 }catch(Exception e){ 23 e.printStackTrace(); 24 } 25 } 26 27 }
二:在java中用GroovyShell执行groovy代码
UseGroovyShell.java
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1 package groovy_java_0; 2 3 import java.math.BigDecimal; 4 5 import groovy.lang.Binding; 6 import groovy.lang.GroovyShell; 7 8 public class UseGroovyShell { 9 public static void main(String[] args){ 10 Binding binding = new Binding(); 11 binding.setVariable("x", 2.4); 12 binding.setVariable("y",8); 13 GroovyShell shell = new GroovyShell(binding); 14 Object value = shell.evaluate("x+y"); 15 assert value.equals(new BigDecimal(10.4)); 16 } 17 18 }
三:在java中用GroovyScriptEngine执行Groovy代码
Hello.groovy
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1 def hellostatement = "hello ${name}"
UseGroovyScriptEngine.java
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1 package groovy_java_2; 2 3 import groovy.lang.Binding; 4 import groovy.util.GroovyScriptEngine; 5 6 public class UseGroovyScriptEngine { 7 public static void main(String[] args){ 8 try { 9 String[] roots = new String[]{"src/groovy_java_2"}; //设置根目录 10 GroovyScriptEngine gse = new GroovyScriptEngine(roots); //初始化引擎 11 12 Binding binding = new Binding(); 13 binding.setVariable("name", "Gweneth"); 14 15 Object output = gse.run("Hello.groovy", binding); 16 System.out.println(output); 17 assert output.equals("hello Gweneth"); 18 19 } catch (Exception e) { 20 // TODO: handle exception 21 e.printStackTrace(); 22 } 23 } 24 25 }
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