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Groovy轻松入门——Grails实战之遗留框架利用篇
很多用户（其中也包括我）害怕失去那些自己所熟悉的东西，比如框架，开发环境等。在这篇随笔中，您将看到 如何 在Grails中利用我们所熟知的框架。其中涉及到配置Spring，配置web.xml和配置dwr.xml，而配置Hibernate在 《 Groovy轻松入门——Grails实战之遗留数据库处理篇 》中已经讲解过了，所以本篇随笔不再累述。 我以利用DWR框架为例稍作讲解。

Grails无需任何配置，但不阻止我们配置

在Grails0.6+中，配置稍有不同，详见 朝花夕拾——Groovy & Grails

1，“grails create-app dwrDemo”，创建Grails工程
2，将dwr.jar(https://dwr.dev.java.net/files/documents/2427/56756/dwr.jar)放到lib目录中（我使用的是DWR2）
3，给web-app\WEB-INF\web.template.xml添加如下内容（ 我们可以通过修改web.template.xml来达到配置web.xml的目的 ）：
     < servlet >
         < servlet-name > dwr-invoker </ servlet-name >
         < servlet-class > org.directwebremoting.servlet.DwrServlet </ servlet-class >
         < init-param >
             < param-name > debug </ param-name >
             < param-value > true </ param-value >
         </ init-param >
     </ servlet >
     < servlet-mapping >
         < servlet-name > dwr-invoker </ servlet-name >
         < url-pattern > /dwr/* </ url-pattern >
     </ servlet-mapping >
web-app\WEB-INF\web.template.xml的最终内容如下所示：
<? xml version="1.0" encoding="UTF-8" ?>
< web-app  version ="2.4"
         xmlns ="http://java.sun.com/xml/ns/j2ee"
         xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation ="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >

     < context-param >
         < param-name > log4jConfigLocation </ param-name >
         < param-value > /WEB-INF/classes/log4j.properties </ param-value >
     </ context-param >   
    
     < context-param >
       < param-name > contextConfigLocation </ param-name >
       < param-value > /WEB-INF/applicationContext.xml </ param-value >
     </ context-param >

     < context-param >
         < param-name > webAppRootKey </ param-name >
         < param-value > dwrtest </ param-value >
     </ context-param >

     < filter >
            < filter-name > sitemesh </ filter-name >
         < filter-class > org.codehaus.groovy.grails.web.sitemesh.GrailsPageFilter </ filter-class >
     </ filter >

      < filter >
         < filter-name > charEncodingFilter </ filter-name >
         < filter-class > org.springframework.web.filter.DelegatingFilterProxy </ filter-class >
         < init-param >
           < param-name > targetBeanName </ param-name >
           < param-value > characterEncodingFilter </ param-value >
         </ init-param >
         < init-param >
           < param-name > targetFilterLifecycle </ param-name >
           < param-value > true </ param-value >
         </ init-param >
       </ filter >

     < filter-mapping >
         < filter-name > charEncodingFilter </ filter-name >
         < url-pattern > /* </ url-pattern >
     </ filter-mapping >

     < filter-mapping >
         < filter-name > sitemesh </ filter-name >
         < url-pattern > /* </ url-pattern >
     </ filter-mapping >

     < listener >
       < listener-class > org.springframework.web.util.Log4jConfigListener </ listener-class >
     </ listener >     
    
     < listener >
       < listener-class > org.codehaus.groovy.grails.web.context.GrailsContextLoaderListener </ listener-class >
     </ listener >       

     <!--  Grails dispatcher servlet  -->
     < servlet >
         < servlet-name > grails </ servlet-name >
         < servlet-class > org.codehaus.groovy.grails.web.servlet.GrailsDispatcherServlet </ servlet-class >
         < load-on-startup > 1 </ load-on-startup >
     </ servlet >

     <!--  The Groovy Server Pages servlet  -->
       < servlet >
         < servlet-name > gsp </ servlet-name >
         < servlet-class > org.codehaus.groovy.grails.web.pages.GroovyPagesServlet </ servlet-class >
      </ servlet >

     < servlet-mapping >
         < servlet-name > gsp </ servlet-name >
         < url-pattern > *.gsp </ url-pattern >
     </ servlet-mapping >
   
    <!-- DWR servlet  -->
     < servlet >
         < servlet-name > dwr-invoker </ servlet-name >
         < servlet-class > org.directwebremoting.servlet.DwrServlet </ servlet-class >
         < init-param >
             < param-name > debug </ param-name >
             < param-value > true </ param-value >
         </ init-param >
     </ servlet >
     < servlet-mapping >
         < servlet-name > dwr-invoker </ servlet-name >
         < url-pattern > /dwr/* </ url-pattern >
     </ servlet-mapping >

     < welcome-file-list >
          <!--
         The order of the welcome pages is important.  JBoss deployment will
         break if index.gsp is first in the list.
          -->
          < welcome-file > index.jsp </ welcome-file >
          < welcome-file > index.gsp </ welcome-file >
     </ welcome-file-list >

     < jsp-config >
         < taglib >
             < taglib-uri > http://java.sun.com/jsp/jstl/core </ taglib-uri >
             < taglib-location > /WEB-INF/tld/c.tld </ taglib-location >
         </ taglib >
         < taglib >
             < taglib-uri > http://java.sun.com/jsp/jstl/fmt </ taglib-uri >
             < taglib-location > /WEB-INF/tld/fmt.tld </ taglib-location >
         </ taglib >
         < taglib >
             < taglib-uri > http://www.springframework.org/tags </ taglib-uri >
             < taglib-location > /WEB-INF/tld/spring.tld </ taglib-location >
         </ taglib >
         < taglib >
             < taglib-uri > http://grails.codehaus.org/tags </ taglib-uri >
             < taglib-location > /WEB-INF/tld/grails.tld </ taglib-location >
         </ taglib >
     </ jsp-config >

</ web-app >

4，在src\java下，建立如下目录结构：
    edu
    └─ecust
        ├─service
        │  │  Service.java
        │  │  
        │  └─impl
        │          SomeServiceImpl.java
        │          
        └─test
                Hello.java

Hello.java
package  edu.ecust.test;

 import  edu.ecust.service.Service;

 public   class  Hello {
     private  Service service;
    
     public   void  setService(Service service) {
         this .service  =  service;
    }
    
     public  String hello(String name) {
         boolean  result  =  service.doSomething(name);
         return  result  ?   " Welcome  "   +  name :  " Hello  "   +  name;
    }
}

Service.java
package  edu.ecust.service;

 public   interface  Service {
     public   boolean  doSomething(String name);
}

SomeServiceImpl.java
package  edu.ecust.service.impl;

 import  edu.ecust.service.Service;

 public   class  SomeServiceImpl  implements  Service {
     public   boolean  doSomething(String name) {
         if  ( " Daniel " .equals(name)) {
             return   true ;
        }  else  {
             return   false ;
        }
    }
}

5，修改spring\resources.xml的内容 （ 我们可以通过修改 resources.xml 来达到配置Spring的目的 ）：
<? xml version="1.0" encoding="UTF-8" ?>
< beans  xmlns ="http://www.springframework.org/schema/beans"
       xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation ="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd" >
    
     < bean  id ="someService"  class ="edu.ecust.service.impl.SomeServiceImpl"   />
     < bean  id ="welcome"  class ="edu.ecust.test.Hello" >
         < property  name ="service"  ref ="someService"   />
     </ bean >
</ beans >

6，在web-app\WEB-INF目录下新建dwr.xml，修改内容如下：
<? xml version="1.0" encoding="UTF-8" ?>
<! DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://www.getahead.ltd.uk/dwr/dwr20.dtd" >
< dwr >
     < allow >
         < create  creator ="spring"  javascript ="welcome" >
             < param  name ="beanName"  value ="welcome"   />
         </ create >
     </ allow >
</ dwr >

7，在web-app\js目录下新建hello.js，修改内容如下：
function  hello() {
    var  name  =  $('name').value;
    welcome.hello(name, callback);
}
 
 function  callback(msg) {
    DWRUtil.setValue('result', msg);
} 

8，“grails create-controller User”创建一个UserController
9，修改grails-app\controllers\UserController.groovy内容：
class  UserController {
    def hello  =  {}
}

10，在grails-app\views\user目录下新建新建hello.gsp，修改内容如下：
< html >
     < head >
       < script  type ='text/javascript'  src ='<%=request.getContextPath()% > / dwr / interface / welcome.js' > </ script >
       < script  type ='text/javascript'  src ='<%=request.getContextPath()% > / dwr / engine.js' > </ script >
       < script  type ='text/javascript'  src ='<%=request.getContextPath()% > / dwr / util.js' > </ script >
       < script  type ='text/javascript'  src ='<%=request.getContextPath()% > / js / hello.js' > </ script >
     </ head >
     < body >
     
        Name:  < input  id ="name"  type ="text"  onKeyup ='hello();' />
         
         < div  id ="result" ></ div >
     </ body >
</ html >
11，“grails run-app”，启动这个Web应用程序
12，访问http://localhost:8080/dwrDemo/user/hello，并输入Daniel，注意观察效果：
Name:
Hello Dan

Name:
Welcome Daniel


附：朝花夕拾——Groovy & Grails
posted on 2007-06-22 21:44 山风小子 阅读(4020) 评论(2)  编辑  收藏 所属分类: Groovy & Grails 、Ajax
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