Velocity Template Engine Learning (2)-velocity Tools 2.0

With velocity, many of the original tags are unusable and must be done with velocity tools, the latest version of Velocity Tools is 2.0, and here are some considerations for velocity tools:

1. Integration issues with Spring MVC 3.x/4.x

Spring 3.x/4.x only supports 1.3.x velocity tools, and to use 2.0 you must extend the Velocitytoolboxview class yourself

1  Packageorg.springframework.web.servlet.view.velocity;2 3 ImportJava.util.Map;4 5 Importjavax.servlet.http.HttpServletRequest;6 ImportJavax.servlet.http.HttpServletResponse;7 8 ImportOrg.apache.velocity.context.Context;9 ImportOrg.apache.velocity.tools.Scope;Ten ImportOrg.apache.velocity.tools.ToolManager; One ImportOrg.apache.velocity.tools.view.ViewToolContext; A ImportOrg.springframework.web.servlet.view.velocity.VelocityToolboxView; -  -  Public classVelocitytoolbox2viewextendsVelocitytoolboxview { the @Override -     protectedContext Createvelocitycontext (map<string, object>model, - httpservletrequest request, httpservletresponse response) -             throwsException {//Create a +                                 //Chainedcontext -                                 //instance. + Viewtoolcontext CTX; A  atCTX =NewViewtoolcontext (Getvelocityengine (), request, response, - Getservletcontext ()); -  - Ctx.putall (model); -  -         if( This. gettoolboxconfiglocation ()! =NULL) { inToolmanager TM =NewToolmanager (); - Tm.setvelocityengine (Getvelocityengine ()); to tm.configure (Getservletcontext (). Getrealpath ( + gettoolboxconfiglocation ())); -             if(Tm.gettoolboxfactory (). Hastools (Scope.request)) { the Ctx.addtoolbox (Tm.gettoolboxfactory (). Createtoolbox ( * scope.request)); $             }Panax Notoginseng             if(Tm.gettoolboxfactory (). Hastools (scope.application)) { - Ctx.addtoolbox (Tm.gettoolboxfactory (). Createtoolbox ( the scope.application)); +             } A             if(Tm.gettoolboxfactory (). Hastools (scope.session)) { the Ctx.addtoolbox (Tm.gettoolboxfactory (). Createtoolbox ( + scope.session)); -             } $         } $         returnCTX; -     } -}

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The following settings are then referenced in the servlet configuration file for spring MVC:

1 <Bean2                     class= "Org.springframework.web.servlet.view.velocity.VelocityViewResolver">3                     < Propertyname= "Order"value= "0" />4                     < Propertyname= "Cache"value= "true" />5                     < Propertyname= "prefix"value="" />6                     < Propertyname= "suffix"value= ". VM" />7                     < Propertyname= "Toolboxconfiglocation"value= "/web-inf/toolbox.xml" />                    8                     < Propertyname= "ContentType"value= "Text/html;charset=utf-8" />9                     < Propertyname= "Viewclass"value= "Org.springframework.web.servlet.view.velocity.VelocityToolbox2View"></ Property>Ten                 </Bean>

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2. How to get the ContextPath of the current application

1     <Tool>2         <Key>Link</Key>3         <Scope>Request</Scope>4         <class>Org.apache.velocity.tools.view.LinkTool</class>5     </Tool>

With the LinkTool class of Velocity-tools, the current contextpath can be obtained directly with ${link.contextpath} in velocity.

3. How to get URL parameters

1     <Tool>2         <Key>Params</Key>3         <Scope>Request</Scope>4         <class>Org.apache.velocity.tools.view.ParameterTool</class>5     </Tool>

Then you can use similar $params.returnurl to get similar http://xxx.com/login? The ABC section in returnurl=abc

Velocity Template Engine Learning (2)-velocity Tools 2.0