首页 > 代码库 > velocity模板引擎学习(2)-velocity tools 2.0

velocity模板引擎学习(2)-velocity tools 2.0

使用velocity后,原来的很多标签无法使用了,必须借助velocity tools来完成,目前velocity tools最新版本是2.0,下面是velocity tools的一些注意事项:

1. 与Spring MVC 3.x/4.x的集成问题

Spring 3.x/4.x只支持1.3.x的velocity tools,要使用2.0必须自己扩展VelocityToolboxView类

技术分享
 1 package org.springframework.web.servlet.view.velocity; 2  3 import java.util.Map; 4  5 import javax.servlet.http.HttpServletRequest; 6 import javax.servlet.http.HttpServletResponse; 7  8 import org.apache.velocity.context.Context; 9 import org.apache.velocity.tools.Scope;10 import org.apache.velocity.tools.ToolManager;11 import org.apache.velocity.tools.view.ViewToolContext;12 import org.springframework.web.servlet.view.velocity.VelocityToolboxView;13 14 public class VelocityToolbox2View extends VelocityToolboxView {15     @Override16     protected Context createVelocityContext(Map<String, Object> model,17             HttpServletRequest request, HttpServletResponse response)18             throws Exception {// Create a19                                 // ChainedContext20                                 // instance.21         ViewToolContext ctx;22 23         ctx = new ViewToolContext(getVelocityEngine(), request, response,24                 getServletContext());25 26         ctx.putAll(model);27 28         if (this.getToolboxConfigLocation() != null) {29             ToolManager tm = new ToolManager();30             tm.setVelocityEngine(getVelocityEngine());31             tm.configure(getServletContext().getRealPath(32                     getToolboxConfigLocation()));33             if (tm.getToolboxFactory().hasTools(Scope.REQUEST)) {34                 ctx.addToolbox(tm.getToolboxFactory().createToolbox(35                         Scope.REQUEST));36             }37             if (tm.getToolboxFactory().hasTools(Scope.APPLICATION)) {38                 ctx.addToolbox(tm.getToolboxFactory().createToolbox(39                         Scope.APPLICATION));40             }41             if (tm.getToolboxFactory().hasTools(Scope.SESSION)) {42                 ctx.addToolbox(tm.getToolboxFactory().createToolbox(43                         Scope.SESSION));44             }45         }46         return ctx;47     }48 }
View Code

然后在spring mvc的servlet配置文件中参考如下设置:

技术分享
 1 <bean 2                     class="org.springframework.web.servlet.view.velocity.VelocityViewResolver"> 3                     <property name="order" value="0" /> 4                     <property name="cache" value="true" /> 5                     <property name="prefix" value="" /> 6                     <property name="suffix" value=".vm" /> 7                     <property name="toolboxConfigLocation" value="/WEB-INF/toolbox.xml" />                     8                     <property name="contentType" value="text/html;charset=UTF-8" /> 9                     <property name="viewClass" value="org.springframework.web.servlet.view.velocity.VelocityToolbox2View"></property>10                 </bean>
View Code

 

2. 如何获取当前应用的contextPath

1     <tool>2         <key>link</key>3         <scope>request</scope>4         <class>org.apache.velocity.tools.view.LinkTool</class>5     </tool>

借助velocity-tools的LinkTool类,在velocity中直接用${link.contextPath}即可得到当前的contextPath

 

3、如何获取url参数

1     <tool>2         <key>params</key>3         <scope>request</scope>4         <class>org.apache.velocity.tools.view.ParameterTool</class>5     </tool>

然后就可以用类似$params.returnUrl,来获取类似 http://xxx.com/login?returnUrl=abc 中的 abc部分

velocity模板引擎学习(2)-velocity tools 2.0