23 在java中使用groovy类

1       在java中使用groovy类

1.1  直接调用groovy类

在java中调用Groovy类，需要增加Groovy运行时到java的classpath中。

pom.xml

<dependency>

           <groupId>org.codehaus.groovy</groupId>

           <artifactId>groovy-all</artifactId>

           <version>2.4.5</version>

       </dependency>

创建一个包：de.vogella.groovy.java

创建一个Groovy类。

package de.vogella.groovy.java

 

import groovy.transform.ToString

 

@ToString()

class Person {

    String firstName

    String lastName

    int age

    def address

}

创建一个java类

package de.vogella.groovy.java;

 

public class Main {

    public static void main(String[] args) {

       Person p = new Person();

       p.setFirstName("zuoys");

       p.setLastName("遥远2");

       System.out.println(p.getFirstName() + " " + p.getLastName());

       System.out.println(p.toString());

    }

 

}

输出：

zuoys 遥远2

de.vogella.groovy.java.Person(zuoys, 遥远2, 0, null)

1.2  Java调用Groovy脚本

http://www.tuicool.com/articles/baQRVf

JSR223方式

package de.vogella.groovy.java;

 

import java.util.Date;

 

import javax.script.Bindings;

import javax.script.Invocable;

import javax.script.ScriptEngine;

import javax.script.ScriptEngineManager;

 

public class ExecuteGroovyViaJSR223 {

 

    public static void main(String[] args) {

       ScriptEngineManager factory = new ScriptEngineManager();

       // 每次生成一个engine实例

       ScriptEngine engine = factory.getEngineByName("groovy");

       System.out.println(engine.toString());

       assert engine != null;

       // javax.script.Bindings

       Bindings binding = engine.createBindings();

       binding.put("date", new Date());

       // 如果script文本来自文件,请首先获取文件内容

       try {

           engine.eval("def getTime(){return date.getTime();}", binding);

           engine.eval("def sayHello(name,age){return 'Hello,I am ' + name + ',age' + age;}");

           Long time = (Long) ((Invocable) engine).invokeFunction("getTime", null);

           System.out.println("执行结果："+time);

           String message = (String) ((Invocable) engine).invokeFunction("sayHello", "zhangsan", new Integer(12));

           System.out.println("执行结果："+message);

       } catch (Exception e) {

           // TODO Auto-generated catch block

           e.printStackTrace();

       }

 

    }

 

}

输出

org.codehaus.groovy.jsr223.GroovyScriptEngineImpl@38af3868

执行结果：1469518145323

执行结果：Hello,I am zhangsan,age12