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