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			即使世界明天毀滅，我也要在今天種下我的葡萄樹(shù)。 
		    		
	
    

    

    

    

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				在Spring中如何使用Freemarker
			
    
 			Posted on 2006-12-20 15:18 花 閱讀(780) 評(píng)論(0)  編輯  收藏  所屬分類: XML Design 
			
			


		
    
		
    
		
    
				
						
    
								
										
												在Spring中如何使用Freemarker
										
										
    
								    		
						
    
						
    
								
										
								
						
    
						
    
								
										
    
												
														
    
																
																		
    
																				
    
																						
      
																								
    1. 
																										Copy 
																										freemarker.jar
																										 (from the 
																										lib
																										 directory of the FreeMarker distribution) into the 
																										WEB-INF/lib
																										 directory of your Web application.
																								
      2. 
																								
    2. 
																										Insert the following section to the 
																										WEB-INF/web.xml
																										 file of your Web application (and adjust it if required):
																								
      3. 
																						
    
																						
    
																								
																										
    
																												
																														
    
																																
																																		
																																		
																																				
																																				
																																				
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																						
																																				
																																				
																																				
																																				
																																				
																																		
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																										
    
																										
    
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
    
																																				
																																						
    
																																								<servlet>
																																						
    
																																						
    
																																								
																																										? <servlet-name>freemarker</servlet-name>
																																						
    
																																						
    
																																								
																																										? <servlet-class>freemarker.ext.servlet.FreemarkerServlet</servlet-class>
																																						
    
																																						
    
																																								
																																										??? 
																																										
																																										
																																								
																																						
    
																																						
    
																																								
																																										? <!-- FreemarkerServlet settings: -->
																																						
    
																																						
    
																																								
																																										? <init-param>
																																						
    
																																						
    
																																								
																																										??? <param-name>TemplatePath</param-name>
																																						
    
																																						
    
																																								
																																										??? <param-value>/</param-value>
																																						
    
																																						
    
																																								
																																										? </init-param>
																																						
    
																																						
    
																																								
																																										? <init-param>
																																						
    
																																						
    
																																								
																																										??? <param-name>NoCache</param-name>
																																						
    
																																						
    
																																								
																																										??? <param-value>true</param-value>
																																						
    
																																						
    
																																								
																																										? </init-param>
																																						
    
																																						
    
																																								
																																										? <init-param>
																																						
    
																																						
    
																																								
																																										??? <param-name>ContentType</param-name>
																																						
    
																																						
    
																																								
																																										??? <param-value>text/html</param-value>
																																						
    
																																						
    
																																								
																																										? </init-param>
																																						
    
																																						
    
																																								
																																										??? 
																																										
																																										
																																								
																																						
    
																																						
    
																																								
																																										? <!-- FreeMarker settings: -->
																																						
    
																																						
    
																																								
																																										? <init-param>
																																						
    
																																						
    
																																								
																																										??? <param-name>template_update_delay</param-name>
																																						
    
																																						
    
																																								
																																										??? <param-value>0</param-value> <!-- 0 is for development only! Use higher value otherwise. -->
																																						
    
																																						
    
																																								
																																										? </init-param>
																																						
    
																																						
    
																																								
																																										? <init-param>
																																						
    
																																						
    
																																								
																																										??? <param-name>default_encoding</param-name>
																																						
    
																																						
    
																																								
																																										??? <param-value>ISO-8859-1</param-value>
																																						
    
																																						
    
																																								
																																										? </init-param>
																																						
    
																																						
    
																																								
																																										? <init-param>
																																						
    
																																						
    
																																								
																																										??? <param-name>number_format</param-name>
																																						
    
																																						
    
																																								
																																										??? <param-value>0.##########</param-value>
																																						
    
																																						
    
																																								
																																										? </init-param>
																																						
    
																																						
    
																																								
																																										?
																																								
																																						
    
																																						
    
																																								
																																										? <load-on-startup>1</load-on-startup>
																																						
    
																																						
    
																																								</servlet>
																																						
    
																																						
    
																																								
																																										?
																																								
																																						
    
																																						
    
																																								<servlet-mapping>
																																						
    
																																						
    
																																								
																																										? <servlet-name>freemarker</servlet-name>
																																						
    
																																						
    
																																								
																																										? <url-pattern>*.ftl</url-pattern>
																																						
    
																																						
    
																																								</servlet-mapping>?
																																								
																																								
																																								
																																										
																																										
																																								
																																						
    
																																				    		
																																		
    
																																    
																														
    
																														
    
																																
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																										
    
																										
    
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																										
    
																								    
																						
    
																						
    
																								That's all. After this, you can use FTL files (
																								*.ftl
																								) in the same manner as JSP (
																								*.jsp
																								) files. (Of course you can choose another extension besides 
																								ftl
																								; it is just the convention)
																						
    
																						
    
																								
																										Note
																								
																						
    
																						
    
																								How does it work? Let's examine how JSP-s work. Many servlet container handles JSP-s with a servlet that is mapped to the 
																								*.jsp
																								 request URL pattern. That servlet will receive all requests where the request URL ends with 
																								.jsp
																								, find the JSP file based on the request URL, and internally compiles it to a 
																								Servlet
																								, and then call the generated servlet to generate the page. The 
																								FreemarkerServlet
																								 mapped here to the 
																								*.ftl
																								 URL pattern does the same, except that FTL files are not compiled to 
																								Servlet
																								-s, but to 
																								Template
																								 objects, and then the 
																								process
																								 method of 
																								Template
																								 will be called to generate the page.
																						
    
																						
    
																								
																								
																								For example, instead of this JSP file (note that it heavily uses Struts tag-libs to save designers from embedded Java monsters):
																						
    
																						
    
																								
																										
    
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																										
    
																										
    
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
    
																																				
																																						
    
																																								<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
																																						
    
																																						
    
																																								<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
																																						
    
																																						
    
																																								
																																										?
																																								
																																						
    
																																						
    
																																								<html>
																																						
    
																																						
    
																																								<head><title>Acmee Products International</title>
																																						
    
																																						
    
																																								<body>
																																						
    
																																						
    
																																								
																																										? <h1>Hello <bean:write name="user"/>!</h1>
																																						
    
																																						
    
																																								
																																										? <p>These are our latest offers:
																																						
    
																																						
    
																																								
																																										? <ul>
																																						
    
																																						
    
																																								
																																										??? <logic:iterate name="latestProducts" id="prod">
																																						
    
																																						
    
																																								
																																										????? <li><bean:write name="prod" property="name"/>
																																						
    
																																						
    
																																								
																																										??????? for <bean:write name="prod" property="price"/> Credits.
																																						
    
																																						
    
																																								
																																										??? </logic:iterate>
																																						
    
																																						
    
																																								
																																										? </ul>
																																						
    
																																						
    
																																								</body>
																																						
    
																																						
    
																																								</html>?
																																								
																																								
																																								
																																										
																																										
																																								
																																						
    
																																				    		
																																		
    
																																    
																														
    
																														
    
																																
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																										
    
																										
    
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																										
    
																								    
																						
    
																						
    
																								you can use this FTL file (use 
																								ftl
																								 file extension instead of 
																								jsp
																								):
																						
    
																						
    
																								
																										
    
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																										
    
																										
    
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
    
																																				
																																						
    
																																								<html>
																																						
    
																																						
    
																																								<head><title>Acmee Products International</title>
																																						
    
																																						
    
																																								<body>
																																						
    
																																						
    
																																								
																																										? <h1>Hello ${user}!</h1>
																																						
    
																																						
    
																																								
																																										? <p>These are our latest offers:
																																						
    
																																						
    
																																								
																																										? <ul>
																																						
    
																																						
    
																																								
																																										??? <#list latestProducts as prod>
																																						
    
																																						
    
																																								
																																										????? <li>${prod.name} for ${prod.price} Credits.
																																						
    
																																						
    
																																								
																																										??? </#list>
																																						
    
																																						
    
																																								
																																										? </ul>
																																						
    
																																						
    
																																								</body>
																																						
    
																																						
    
																																								</html>?
																																								
																																								
																																								
																																										
																																										
																																								
																																						
    
																																				    		
																																		
    
																																    
																														
    
																														
    
																																
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																										
    
																										
    
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																												
																														
    
																																
																																		
																																				
																																				
																																		
																																		
																																		
																																
																														
    
																												    		
																										
    
																								    
																						
    
																				
    
																		
    
																    		
														
    
												    
										
    
								    		
						
    
				    
		
    

    
	
    


    
	    
    




    








    

				
			
    
		    		
	
    
	
    
		
			

		
	
    

    


    







    
        
	



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