java中调用groovy

Groovy在Java中的应用，做几个小例子以备查 

package com.boco.efficiency.groovy;

import groovy.lang.Binding;

import groovy.lang.GroovyClassLoader;

import groovy.lang.GroovyObject;

import groovy.lang.GroovyShell;

import groovy.text.SimpleTemplateEngine;

import groovy.text.Template;

import groovy.util.GroovyScriptEngine;

import java.io.File;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import org.apache.log4j.Logger;

import org.codehaus.groovy.control.CompilationFailedException;



public class groovyUsage {

    private static final Logger logger = Logger.getLogger(groovyUsage.class);

    /*

     * UseClassLoader usage example

     * Use groovy UseClassLoader to parse/compile a groovy file and run it 

     * */    

    public  void UseClassLoader() throws Exception {

        ClassLoader parent =  getClass().getClassLoader();  

        GroovyClassLoader loader = new GroovyClassLoader(parent);  

        Class groovyClass = loader.parseClass(new File("D:\\StudyCode\\checkGroovy\\src\\main\\java\\com\\boco\\common\\HelloWorld.groovy"));  

        GroovyObject groovyObject = (GroovyObject) groovyClass.newInstance();  

        Object[] args = {};  

        groovyObject.invokeMethod("sayHello", args); 

    }

    

    /*

     * GroovyShell usage example

     * Use groovy shell to calculate dynamically
　　　　 注意其中的groovyShell.evalucate会比较好用

     * */

    public  void UseGroovyShell() {

        Binding binding = new Binding();

        binding.setVariable("foo", new Integer(30));

        GroovyShell shell = new GroovyShell(binding);

        Object value = shell.evaluate("println 'Hello World! I\\'m in shell'; x = 123; return foo * 10");

        logger.info("result:  " + value);

        assert value.equals(new Integer(20));

    }

    

    /*

     * GroovyScriptEngine usage example

     * GroovyScriptEngine是实际场景中应用最多的,其构造参数中需要加入urls指明groovy应用路径

     * */

    public void useGroovyScriptEngine()  throws Exception {          

        String[] roots = new String[] { "/StudyCode/checkGroovy/src/main/java/com/boco/common/" };  

        GroovyScriptEngine gse = new GroovyScriptEngine(roots);  

        Binding binding = new Binding();  

        binding.setVariable("input", "world");

        gse.run("hello.groovy", binding);

        logger.info(binding.getVariable("output"));  

    }

    

    /*

     * Use groovy.Text.Template to gen new String 
      这在动态生成某些文本文件或script时会有大用处^^

     * */

    public void useGroovyTextTemplate()  throws Exception {          

          File file=new File("D:\\StudyCode\\checkGroovy\\src\\main\\java\\com\\boco\\common\\template.tmpl");

            Template tmpl =null;

            try {

                tmpl = new SimpleTemplateEngine().createTemplate(file);

            } catch (CompilationFailedException e) {

                e.printStackTrace();

            } catch (ClassNotFoundException e) {

                e.printStackTrace();

            } catch (IOException e) {

                e.printStackTrace();

            }

            

            Map binding = new HashMap();

            binding.put("id", "101");    

            binding.put("name", "101");    

            binding.put("salary", "50000");    

            String xml = tmpl.make(binding).toString();

            logger.info(xml); 

    }

}

配置文件信息

D:\StudyCode\checkGroovy\src\main\java\com\haha\common>cat hello.groovy

output = "Hello, ${input}!"

D:\StudyCode\checkGroovy\src\main\java\com\haha\common>cat HelloWorld.groovy

class HelloWorld {

        public void sayHello() {

                System.out.println("hello world from HelloWorld.groovy");

        }

}

D:\StudyCode\checkGroovy\src\main\java\com\haha\common>cat check.groovy

import com.haha.common.alarmObj;

public class check {

        public void localHandle(alarmObj src,alarmObj dest) {

                long newfp3=src.getFp0()+src.getFp1()+src.getFp2();

                System.out.println("call in groovy: " + newfp3);

        }

}

D:\StudyCode\checkGroovy\src\main\java\com\haha\common>cat template.tmpl

<WholeMsg MsgMark='1231' Priority='' FieldNum=''>

    <person>

        <id>${id}</id>

        <name>${name}</name>

        <salary>${salary}</salary>

    </person>

</WholeMsg>

调用各用例

package com.boco.efficiency.groovy;



import java.io.File;

public class groovyCheck {

    /**

     * @param args

     */

    public static void main(String[] args) throws Exception{

        groovyUsage groovyExample = new groovyUsage();

        groovyExample.UseGroovyShell();

        groovyExample.UseClassLoader();

        groovyExample.useGroovyScriptEngine();

        groovyExample.useGroovyTextTemplate();

    }    

}

最终输出

Hello World! I'm in shell

[2013-11-05 17:03:47,432] INFO [com.boco.efficiency.groovy.groovyUsage] - [result:  300]

hello world from HelloWorld.groovy

[2013-11-05 17:03:47,488] INFO [com.boco.efficiency.groovy.groovyUsage] - [Hello, world!]

[2013-11-05 17:03:47,506] INFO [com.boco.efficiency.groovy.groovyUsage] - [<WholeMsg MsgMark='1231' Priority='' FieldNum=''>

    <person>

        <id>101</id>

        <name>101</name>

        <salary>50000</salary>

    </person>

</WholeMsg>]

 

参考文档

http://ivan.iteye.com/blog/373237

http://groovy.codehaus.org/Embedding+Groovy