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