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songzj001:
DbUnit入门实战
Spring 2.0 introduced comprehensive support to use dynamic languages. It supports three different scripting languages; JRuby , Groovy and BeanShell . The scripting language used in this article is Groovy; which I think was designed for Java developers. As Scott Davis says in his book, Groovy Recipes ” Groovy is Java at the end of the day”. “Spring Recipes - A Problem -Solution Approach ” written by Gary Mak has a complete chapter dedicated to Scripting in Spring . The author covers all the three dynamic languages supported by Spring; JRuby , Groovy and BeanShell .
There are times when in your application you have certain modules that require frequent changes, and based on these changes you need to change the business logic within your modules. If these modules were written in Java, you can imagine what needs to be done at this point; recompile, package, redeploy. This is where modules written in these dynamic languages come in handy, there is no need to recompile, or redeploy for these changes to take effect. In most cases, you want the Spring container to be able to detect these changes and also pick up the new state from the changed script source. Spring allows you to do this as well by setting one simple attribute.
Hello World Example: It is customary to start any tutorial by writing a simple HelloWorld program, right? We are going to use Groovy in this tutorial. This tutorial assumes you have some knowledge of Spring and Groovy. I used Eclipse IDE for this tutorial, and to work with Spring and Groovy in Eclipse, you need the following libraries in your build path.
So, lets begin with the HelloWorld example here.
Step 1: Lets define an interface for our HelloWorld Service :
package com.springandgroovy;
public interface HelloWorldService {
String sayHello();
}
Step 2 : Implement the interface in Groovy.
Next, we implement this interface in Groovy by creating a simple script within the com.springandgroovy package as such:
import com.springandgroovy.HelloWorldService;
class HelloWorldServiceImpl implements HelloWorldService {
String name
String sayHello()
{
"Hello $name. Welcome to Scripting in Groovy."
}
}
Step 3: Make changes to Spring’s configuration file.
Here comes the Spring’s bean configuration file, in which you have to include the lang schema
to use the custom dynamic language tags.
<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">
the bean definition for the Groovy backed HelloWorldService looks like this:
<lang:groovy id="helloWorldService"
script-source="classpath:com/springandgroovy/HelloWorldServiceImpl.groovy">
<lang:property name="name" value="meera"/>
</lang:groovy>
That’s all you need to use Groovy backed beans in Spring. So, how do we know this works, right? Lets write a simple Main class and test it within our IDE:
Step 4: Run the HelloWorldService.
package com.springandgroovy;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
public static void main(String[] args) throws Exception {
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
HelloWorldService service = (HelloWorldService) context.getBean("helloWorldService");
System.out.println(service.sayHello());
}
}
And you should be able to see output in the console as such:
Step 5: Refreshable Beans.
As I mentioned earlier also, to turn on this feature we have to specify one simple attribute refresh-check-delay
on the element of our bean definition as such:
<lang:groovy id="helloWorldService"
script-source="classpath:com/springandgroovy/HelloWorldServiceImpl.groovy"
refresh-check-delay="5000">
<lang:property name="name" value="meera"/>
</lang:groovy>
Again, how do we know this works when we make changes to our Groovy Script? A small change in our Main class and, and you should be set to test that this works as well:
package com.springandgroovy;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
public static void main(String[] args) throws Exception {
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
HelloWorldService service = (HelloWorldService) context.getBean("helloWorldService");
System.in.read();
System.out.println(service.sayHello());
}
}
Now, run the Main class in your IDE, it halts because of the System.in.read line, make a few changes within your script, save it, hit enter in your console window in your IDE. The Spring container read our new changes and prints the results within the console window.
The script change can be as simple as adding a few special characters as such within the sayHello() method:
String sayHello()
{
"Hello $name!!!. Welcome to Scripting in Groovy."
}
And the console window reflects these changes:
Step 6: Inline Scripts
Spring also allows you to embed scripts directly within the Spring bean
definitions inside your Spring configuration file. I am no fan of doing
this, because it has a drawback; the refresh attribute is not
applicable for inline scripts. Lets take a look at this in case you
need to use this feature:
Copy the script we wrote in Step 2 and paste it within the lang:inline-script element as such:
<lang:groovy id="helloWorldService">
<lang:inline-script>
<![CDATA[
import com.springandgroovy.HelloWorldService;
class HelloWorldServiceImpl implements HelloWorldService {
String name
String sayHello()
{
"Hello $name. Welcome to Scripting in Groovy"
}
}
]]>
</lang:inline-script>
<lang:property name="name" value="meera" />
</lang:groovy>
Run the Main class and you should see the same output in your console window.
In this tutorial we learned how to use Groovy with Spring using an external script source file, how to refresh changes when a script source file is changed, and finally saw an inline script which was embedded within the Spring configuration file.
Additional Resources:
1. JRuby
2. Groovy
3. BeanShell
4. Spring
5. Spring Recipes
发表评论
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字符串分割--java中String.split()用法
2013-03-06 14:25 74151在java.lang包中有String.sp ... -
用 HttpServletResponseWrapper 实现 Etag 过滤器
2012-07-09 16:58 3758原文出处:http://blog.chenlb.com/200 ... -
Fitnesse使用
2012-05-05 13:27 23494Fitnesse 的使用 一,介绍 Fitnesse是一种 ... -
Customizing the new FitNesse parser
2012-05-05 13:13 2134FitNesse began its life using ... -
java application中内嵌ActiveX控件
2011-11-14 15:57 5524我这里用的是SWT/JFace开发application,SW ... -
Google Java Developer Tools Downloads
2011-08-09 00:04 2346WindowBuilder Pro原来叫WindowB ... -
Jalita
2011-08-06 00:49 1565Jalita (Java light terminal ada ... -
【转】用Java写字符终端界面
2011-07-29 13:13 2121终端界面GUI开源项目charva。 这个框架让你可以用开发 ... -
[转]mybatis下的分页,支持所有的数据库
2011-07-21 13:21 14841大 家都知道,mybatis的自带分页方法只是逻 ... -
Java framework for text- & console-based forms?
2011-07-21 01:06 1711charva jcurses JNA , ... -
JNA(Java Native Access)学习入门
2011-07-21 01:04 22621Java Native Access 项目 在 ... -
JAVA上加密算法的实现用例
2011-06-25 12:38 4883来源:www.ibm.com ... -
如何将GlassFish作为Windows服务运行
2011-05-18 23:21 2374本文档来自GlassFish官方网站,详细介绍了将 G ... -
JAVA UDP打洞必备知识点---NAT
2011-05-05 12:56 8698一、引言 RFCl631 ... -
Keystore概念,Keytool工具使用
2011-04-28 16:20 2906近来由于项目需要做Single Sign On, 研究了一 ... -
利用Eclipse Profile Plugin监控分析Tomcat性能
2011-04-18 16:14 3702目前新版本的Eclipse在启动应用服务器的时候有一个新的选 ... -
m2eclipse: Eclipse is running in a JRE, but a JDK is required
2011-02-04 23:43 2541Eclipse 安装了Maven插件,启动Eclipse ... -
利用JNative实现Java调用动态库
2010-10-18 00:43 2099由于项目要求,需要用J ... -
RHEL5支持大内存
2010-10-08 16:19 3005安装 RHEL 5 ,硬件为 4G 内存,安装完成 ... -
Windows Server 2003 和 Windows 2000 提供大内存支持
2010-10-08 16:19 1854本文介绍物理地址扩展 ...
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