【推薦】Springboot使用velocity模板引擎
最爽的Web組合開發就是Intellij IDEA + Maven + Spring Boot + Scala + Velocity + Boostrap + jQuery了.
Spring Boot提供了一個強大的一鍵式Spring的整合開發環境,能夠單獨進行一個Spring應用的開發,其中:
(1)集中式配置(application.properties)+註解,大大簡化了開發流程
(2)內嵌的Tomcat和Jetty容器,可直接打成jar包啟動,無需提供Java war包以及繁瑣的Web配置
(3)提供了Spring各個外掛的基於Maven的pom模板配置,開箱即用,便利無比。
(4)可以在任何你想自動化配置的地方,實現可能
(5)提供更多的企業級開發特性,如何系統監控,健康診斷,許可權控制
(6)無冗餘程式碼生成和XML強制配置
(7)提供支援強大的Restfult風格的編碼,非常簡潔
當然Spring Boot提供的功能,遠遠比上面的強大. Spring boot集成了servlet容器,當我們在pom檔案中增加spring-boot-starter-web的maven依賴時,不做任何web相關的配置便能提供web服務,這還得歸於spring boot 自動配置的功能(因為加了EnableAutoConfiguration的註解),幫我們建立了一堆預設的配置,以前在web.xml中配置,現在都可以通過spring bean的方式進行配置,由spring來進行生命週期的管理,大多數情況下,我們需要過載這些配置(例如修改服務的啟動埠,contextpath,filter,listener,servlet,session超時時間等)
本章我們介紹一下,在SB中使用模板引擎Velocity.
SB預設支援的模板引擎
spring boot會自動配置 FreeMarker,Thymeleaf,Velocity,只需要在pom中加入相應的依賴即可
SB使用Velocity的依賴
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-velocity</artifactId>
</dependency>
預設配置下spring boot會從src/main/resources/templates目錄中去找模板
SB的velocity配置
application.properties配置
lightsword/src/main/resources/application.properties
# VELOCITY TEMPLATES (VelocityAutoConfiguration)
spring.velocity.charset=UTF-8
spring.velocity.properties.input.encoding=UTF-8
spring.velocity.properties.output.encoding=UTF-8
spring.velocity.resourceLoaderPath=classpath:/templates/
spring.velocity.suffix=.html
spring.velocity.toolbox-config-location=/WEB-INF/toolbox.xml
這樣,SB會從src/main/resources/templates目錄中去找以.html字尾的模板檔案.
Controller裡面的Model
資料httpapis通過model傳到模板檔案(SpringMVC框架裡面做的事情):
model.addAttribute("httpapis", HttpApiDao.findAll())
完整的Controller程式碼:
package com.springboot.in.action.controller
import java.util.Date
import java.util.concurrent.CountDownLatch
import com.alibaba.fastjson.JSON
import com.springboot.in.action.dao.{HttpApiDao, HttpReportDao, HttpSuiteDao}
import com.springboot.in.action.engine.OkHttp
import com.springboot.in.action.entity.{HttpApi, HttpReport}
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.ui.Model
import org.springframework.web.bind.annotation.{PathVariable, RequestMapping, RequestMethod, RequestParam, ResponseBody, RestController}
import org.springframework.web.servlet.ModelAndView
import scala.collection.JavaConversions._
@RestController
@RequestMapping(Array("/httpapi"))
class HttpApiController @Autowired() (
val HttpSuiteDao: HttpSuiteDao,
val HttpApiDao: HttpApiDao,
val HttpReportDao: HttpReportDao) {
@RequestMapping(value = {
Array("", "/")
}, method = Array(RequestMethod.GET))
def list(model: Model) = {
model.addAttribute("httpapis", HttpApiDao.findAll())
new ModelAndView("/httpapi/list")
}
...
}
模板檔案list.html
lightsword/src/main/resources/templates/httpapi/list.html
#include("/common/header.html")
<div class="form-group">
<table style="word-break: break-all; word-wrap: break-all;"
class="table table-hover table-condensed table-responsive">
<thead>
<tr>
<th style='width: 60px'>Id</th>
<th style='width: 100px'>用例名稱</th>
<th>URL</th>
<th style='width: 80px'>方法</th>
<th style='width: 100px'>期望輸出</th>
<th style='width: 60px'>次數</th>
<th>狀態</th>
<th style='width: 90px'>建立人</th>
<th style='width: 120px'>呼叫時間</th>
<th style='width: 60px'>操作</th>
<th>執行測試</th>
</tr>
</thead>
<tbody>
#foreach ($t in $httpapis)
<tr>
<td>$!t.id</td>
<td>$!t.name</td>
<td>$!t.url</td>
<td>$!t.method</td>
<td>$!t.expectOutput</td>
<td>$!t.runTimes</td> #if($!t.state==1)
<td><div class="btn btn-success">成功</div></td> #elseif($!t.state==0)
<td><div class="btn btn-danger">失敗</div></td> #else
<td><div class="btn btn-info">未執行</div></td> #end
<td>$!t.owner</td>
<td>$!DateTool.format('yyyy-MM-dd HH:mm:ss', $!t.gmtModify)</td>
<td><a href="/httpapi/detailPage/$t.id">檢視</a></td>
<td><div id='btn-$t.id' class='btn btn-primary'
onclick='runTest($t.id)'>執行</div></td>
</tr>
#end
</tbody>
</table>
</div>
<script>
function runTest(id) {
var url = '/httpapi/runTest?id=' + id
$.getJSON(url, function(data) {
if (data) {
alert('響應結果:' + JSON.stringify(data, null, 2))
location.reload()
} else {
alert('執行失敗')
}
})
}
</script>
#include("/common/footer.html")
velocity的語法詳情參考:
toolbox的使用
我們在velocity模板檔案中有時候需要格式化小數點,日期等輸出,我們可以使用toolbox.
我們看到application.properties有這麼一行配置:
spring.velocity.toolbox-config-location=/WEB-INF/toolbox.xml
然後,在list.html裡面有這麼一行程式碼
<td>$!DateTool.format('yyyy-MM-dd HH:mm:ss', $!t.gmtModify)</td>
這個DateTool就是我們這裡要說的toolbox的功能.
lightsword/src/main/resources/WEB-INF/toolbox.xml的配置如下
<?xml version="1.0" encoding="UTF-8"?>
<!-- ============================================================= @(#) toolbox.xml
Copyright (c) 2016, Project, All Rights Reserved. ============================================================= -->
<toolbox>
<!-- [ DateTool ] @see http://www.jajakarta.org/velocity/tools/velocity-tools-1.1/docs-ja/generic/DateTool.html
(ja) @see http://velocity.apache.org/tools/devel/javadoc/org/apache/velocity/tools/generic/DateTool.html
(en) @since VelocityTools 1.0 -->
<tool>
<key>DateTool</key>
<scope>application</scope>
<class>org.apache.velocity.tools.generic.DateTool</class>
</tool>
<!-- [ MathTool ] @see http://www.jajakarta.org/velocity/tools/velocity-tools-1.1/docs-ja/generic/MathTool.html
(ja) @see http://velocity.apache.org/tools/devel/generic/MathTool.html (en)
@since VelocityTools 1.0 -->
<tool>
<key>MathTool</key>
<scope>application</scope>
<class>org.apache.velocity.tools.generic.MathTool</class>
</tool>
<!-- [ NumberTool ] @see http://velocity.apache.org/tools/devel/javadoc/org/apache/velocity/tools/generic/NumberTool.html
(en) @since VelocityTools 1.2 -->
<tool>
<key>NumberTool</key>
<scope>application</scope>
<class>org.apache.velocity.tools.generic.NumberTool</class>
</tool>
<!-- [ RenderTool ] @see http://velocity.apache.org/tools/devel/generic/RenderTool.html
(en) @since VelocityTools 1.0 <tool> <key>render</key> <scope>application</scope>
<class>org.apache.velocity.tools.generic.RenderTool</class> </tool> -->
<!-- [ EscapeTool ] @see http://velocity.apache.org/tools/devel/generic/EscapeTool.html
(en) @since VelocityTools 1.2 -->
<tool>
<key>EscapeTool</key>
<scope>application</scope>
<class>org.apache.velocity.tools.generic.EscapeTool</class>
</tool>
<!-- [ ResourceTool ] @see http://velocity.apache.org/tools/devel/javadoc/org/apache/velocity/tools/generic/ResourceTool.html
(en) @since Velocity 1.3 <tool> <key>text</key> <class>org.apache.velocity.tools.generic.ResourceTool</class>
<parameter name="bundles" value="resources,prj.hoboken.patrasche.resources.PatrascheResources"
/> <parameter name="locale" value="ja_JP" /> </tool> -->
<!-- [ AlternatorTool ] @see http://velocity.apache.org/tools/devel/javadoc/org/apache/velocity/tools/generic/AlternatorTool.html
(en) @since VelocityTools 1.2 -->
<tool>
<key>AlternatorTool</key>
<scope>application</scope>
<class>org.apache.velocity.tools.generic.AlternatorTool</class>
</tool>
<!-- [ ValueParser ] @see http://velocity.apache.org/tools/devel/javadoc/org/apache/velocity/tools/generic/ValueParser.html
(en) @since VelocityTools 1.2 -->
<tool>
<key>ValueParser</key>
<scope>application</scope>
<class>org.apache.velocity.tools.generic.ValueParser</class>
</tool>
<!-- [ ListTool ] @see http://velocity.apache.org/tools/devel/javadoc/org/apache/velocity/tools/generic/ListTool.html
(en) @since VelocityTools 1.2 -->
<tool>
<key>ListTool</key>
<scope>application</scope>
<class>org.apache.velocity.tools.generic.ListTool</class>
</tool>
<!-- [ SortTool ] @see http://velocity.apache.org/tools/devel/javadoc/org/apache/velocity/tools/generic/SortTool.html
(en) @since VelocityTools 1.2 -->
<tool>
<key>SortTool</key>
<scope>application</scope>
<class>org.apache.velocity.tools.generic.SortTool</class>
</tool>
<!-- [ IteratorTool ] @see http://velocity.apache.org/tools/devel/javadoc/org/apache/velocity/tools/generic/IteratorTool.html
(en) @since VelocityTools 1.0 -->
<tool>
<key>IteratorTool</key>
<scope>request</scope>
<class>org.apache.velocity.tools.generic.IteratorTool</class>
</tool>
<!-- ============================================================ [ TOOL
FOR STRUTS TAGLIB ] ============================================================ -->
<!-- [ ActionMessagesTool ] @see http://www.jajakarta.org/velocity/tools/velocity-tools-1.1/docs-ja/struts/ActionMessagesTool.html
(ja) @see http://velocity.apache.org/tools/devel/struts/ActionMessagesTool.html
(en) @since VelocityTools 1.1 -->
<tool>
<key>ActionMessagesTool</key>
<scope>request</scope>
<class>org.apache.velocity.tools.struts.ActionMessagesTool</class>
</tool>
<!-- [ ErrorsTool ] @see http://www.jajakarta.org/velocity/tools/velocity-tools-1.1/docs-ja/struts/ErrorsTool.html
(ja) @see http://velocity.apache.org/tools/devel/struts/ErrorsTool.html (en)
@since VelocityTools 1.0 -->
<tool>
<key>ErrorsTool</key>
<scope>request</scope>
<class>org.apache.velocity.tools.struts.ErrorsTool</class>
</tool>
<!-- [ FormTool ] @see http://www.jajakarta.org/velocity/tools/velocity-tools-1.1/docs-ja/struts/FormTool.html
(ja) @see http://velocity.apache.org/tools/devel/struts/FormTool.html (en)
@since VelocityTools 1.0 -->
<tool>
<key>FormTool</key>
<scope>request</scope>
<class>org.apache.velocity.tools.struts.FormTool</class>
</tool>
<!-- [ MessageTool ] @see http://www.jajakarta.org/velocity/tools/velocity-tools-1.1/docs-ja/struts/MessageTool.html
(ja) @see http://velocity.apache.org/tools/devel/struts/MessageTool.html
(en) @since VelocityTools 1.0 -->
<tool>
<key>MessageTool</key>
<scope>request</scope>
<class>org.apache.velocity.tools.struts.MessageTool</class>
</tool>
<!-- [ StrutsLinkTool ] LinkTool @see http://www.jajakarta.org/velocity/tools/velocity-tools-1.1/docs-ja/struts/StrutsLinkTool.html
(ja) @see http://velocity.apache.org/tools/devel/struts/StrutsLinkTool.html
(en) @since VelocityTools 1.0 -->
<tool>
<key>StrutsLinkTool</key>
<scope>request</scope>
<class>org.apache.velocity.tools.struts.StrutsLinkTool</class>
</tool>
<!-- [ SecureLinkTool ] LinkTool @see http://www.jajakarta.org/velocity/tools/velocity-tools-1.1/docs-ja/struts/SecureLinkTool.html
(ja) @see http://velocity.apache.org/tools/devel/struts/SecureLinkTool.html
(en) @since VelocityTools 1.1 -->
<tool>
<key>SecureLinkTool</key>
<scope>request</scope>
<class>org.apache.velocity.tools.struts.SecureLinkTool</class>
</tool>
<!-- [ TilesTool ] Tiles @see http://www.jajakarta.org/velocity/tools/velocity-tools-1.1/docs-ja/struts/TilesTool.html
(ja) @see http://velocity.apache.org/tools/devel/struts/TilesTool.html (en)
@since VelocityTools 1.1 -->
<tool>
<key>TilesTool</key>
<scope>request</scope>
<class>org.apache.velocity.tools.struts.TilesTool</class>
</tool>
<!-- [ ValidatorTool ] Validator @see http://www.jajakarta.org/velocity/tools/velocity-tools-1.1/docs-ja/struts/ValidatorTool.html
(ja) @see http://velocity.apache.org/tools/devel/struts/ValidatorTool.html
(en) @since VelocityTools 1.1 -->
<tool>
<key>ValidatorTool</key>
<scope>request</scope>
<class>org.apache.velocity.tools.struts.ValidatorTool</class>
</tool>
</toolbox>
這樣我們就可以在模板檔案中使用類似DateTool這樣的工具類了.同時我們也可以在程式碼裡自己實現工具類,然後配置到toolbox.xml檔案裡.