Spring中使用Groovy动态Bean

转载自http://blog.chenlb.com/2009/04/spring-use-groovy-dynamic-bean.html

在 spring 中使用 groovy 等动态语言的好处就是：在服务器上改改或新加个 groovy 文件就可以有新的功能，不用重新打包并部署。对一些规则性的逻辑处理、动态性强的应用可以 groovy。

示例下在 spring 中使用 groovy，我机子环境 spring 2.5.5, groovy-1.5.7。

1、模拟业务接口：

package com.chenlb.groovy;   
  
/**  
 * 业务模拟接口  
 *  
 * @author chenlb 2009-4-7 下午02:04:38  
 */  
public interface Hello {   
  
    String say(String name);   
}  

2、groovy 实现：

package com.chenlb.groovy;   
  
class GroovyHello implements Hello {   
  
    def blog;   
  
    String say(String name) {   
        return "Hello ${name}@${blog}"  
    }   
  
    void setUrl(String blog) {   
        this.blog = blog;   
    }   
}  

3、spring 配置 applicationContext-groovy.xml：

<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
       xmlns:lang="http://www.springframework.org/schema/lang"  
       xsi:schemaLocation="   
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd   
http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.5.xsd">  
  
    <lang:groovy id="groovyHello" script-source="classpath:com/chenlb/groovy/GroovyHello.groovy">  
        <lang:property name="blog" value="http://blog.chenlb.com"></lang:property>  
    </lang:groovy>   
</beans>

 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:lang="http://www.springframework.org/schema/lang"
       xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.5.xsd">

	<lang:groovy id="groovyHello" script-source="classpath:com/chenlb/groovy/GroovyHello.groovy">
	<lang:property name="blog" value="http://blog.chenlb.com"></lang:property>
	</lang:groovy>
</beans>

4、运行：

package com.chenlb.groovy;   
  
import org.springframework.context.ApplicationContext;   
import org.springframework.context.support.FileSystemXmlApplicationContext;   
  
public class Main {   
  
    public static void main(String[] args) {   
        ApplicationContext context = new FileSystemXmlApplicationContext("classpath:applicationContext-groovy.xml");   
  
        Hello hello = (Hello) context.getBean("groovyHello");   
  
        System.out.println(hello.say("chenlb"));   
    }   
  
}  

package com.chenlb.groovy;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

public class Main {

	public static void main(String[] args) {
		ApplicationContext context = new FileSystemXmlApplicationContext("classpath:applicationContext-groovy.xml");

		Hello hello = (Hello) context.getBean("groovyHello");

		System.out.println(hello.say("chenlb"));
	}

}

结果：

Hello chenlb@http://blog.chenlb.com

要在 spring 中用 groovy，依赖的jar有：antlr-2.7.6.jar、aopalliance.jar、asm-2.2.3.jar、asm-commons-2.2.3.jar、asm-util-2.2.3.jar、groovy-1.5.5.jar在spring 的 lib中可以找到，还有spring-aop-2.5.5.jar。当然也可以把groovy-1.5.5.jar换成groovy-1.5.7.jar