SpringMVC同时支持多视图(JSP,Velocity,Freemarker等)的一种思路实现

时间  2019-11-30
标签 springmvc 同时 支持 视图 jsp velocity freemarker 一种 思路 实现 栏目 Spring 繁體版
原文   原文链接

[导读]在基于SpringMVC的项目中有时须要同时使用多种视图格式，如jsp,velocity及freemarker等，经过不一样的请求路径配置规则，映射到不一样的视图文件。下面我提供一种思路，经过视图模板文件后缀名的方式来进行处理。例如：@RequestMapping(value = "/hello") public String jspTest(HttpServletRequest request, M...html

在基于SpringMVC的项目中有时须要同时使用多种视图格式，如jsp,velocity及freemarker等，经过不一样的请求路径配置规则，映射到不一样的视图文件。下面我提供一种思路，经过视图模板文件后缀名的方式来进行处理。例如：java

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@RequestMapping (value =  "/hello" ) 
public  String jspTest(HttpServletRequest request, ModelMap map) { 
     return  "demo.jsp" ; 
}

将经过”demo.jsp”的后缀自动使用jsp的视图解析器。web

下面描述下详细思路：spring

一.自定义视图解析器apache

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package  com.jeedev.common.web.springmvc.view;
 
import  java.util.HashMap;
import  java.util.Locale;
import  java.util.Map;
import  java.util.Set;
 
import  org.apache.commons.logging.Log;
import  org.apache.commons.logging.LogFactory;
import  org.springframework.web.servlet.View;
import  org.springframework.web.servlet.ViewResolver;
 
/**
* 自定义视图解析(经过配置实现多视图整合,如jsp,velocity,freemarker,pdf,excel...)
* @author huligong
*
*/
public  class  JeeDevViewResolver  implements  ViewResolver  {
    
    private  static  Log logger = LogFactory.getLog(JeeDevViewResolver. class );
 
    public  View resolveViewName(String viewName, Locale locale)  throws  Exception {
       for (Map.Entry<Set<String>, ViewResolver> map : viewResolverMap.entrySet()){
           Set<String> suffixs = map.getKey();
           for (String suffix : suffixs){
               if  (viewName.endsWith(suffix)){
                   ViewResolver viewResolver = map.getValue();
                   if ( null  != viewResolver){
                       if  (logger.isDebugEnabled()) {
                            logger.debug( "found viewResolver '"  + viewResolver +  "' for viewName '"  + viewName+  "'" );
                        }
                       return  viewResolver.resolveViewName(viewName, locale);
                   }
               }
           }
       }
       
       if (defaultViewResolver !=  null ){
           return  defaultViewResolver.resolveViewName(viewName, locale);
       }
       // to allow for ViewResolver chaining
       return  null ;
    }
    
    
    private  Map<Set<String>,ViewResolver> viewResolverMap =  new  HashMap<Set<String>,ViewResolver>();
    
    private  ViewResolver defaultViewResolver =  null ;
 
    public  Map<Set<String>, ViewResolver> getViewResolverMap() {
        return  viewResolverMap;
    }
 
    public  void  setViewResolverMap(Map<Set<String>, ViewResolver> viewResolverMap) {
        this .viewResolverMap = viewResolverMap;
    }
 
    public  ViewResolver getDefaultViewResolver() {
        return  defaultViewResolver;
    }
 
    public  void  setDefaultViewResolver(ViewResolver defaultViewResolver) {
        this .defaultViewResolver = defaultViewResolver;
    }
}

在自定义视图解析器(实际上是视图中转器)中，经过对视图文件的后缀判断(而不是请求地址的后缀)而返回给不一样的视图解析器处理。mvc

二.视图映射配置dispather-servlet.xmlapp

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< bean  id = "viewResolver"  class = "com.jeedev.common.web.springmvc.view.JeeDevViewResolver" >
        < property  name = "defaultViewResolver"  ref = "beanNameViewResolver" />
        < property  name = "viewResolverMap" >
            < map >
                < entry >
                    < key >
                        < set >
                            < value >.jsp</ value >
                        </ set >
                    </ key >
                    < ref  bean = "jspViewResolver" />
                </ entry >
                < entry >
                    < key >
                        < set >
                            < value >.vm</ value >
                            < value >.htm</ value >
                        </ set >
                    </ key >
                    < ref  bean = "velocityViewResolver" />
                </ entry >
                < entry >
                    < key >< value >.ftl</ value ></ key >
                    < ref  bean = "freeMarkerViewResolver" />
                </ entry >
            </ map >
        </ property >
    </ bean >
 
    
    < bean  id = "beanNameViewResolver"  class = "org.springframework.web.servlet.view.BeanNameViewResolver" />
    
    < bean  id = "jspViewResolver"  class = "org.springframework.web.servlet.view.InternalResourceViewResolver" >
        < property  name = "viewClass"  value = "org.springframework.web.servlet.view.JstlView" />
        < property  name = "prefix"  value = "/WEB-INF/jsp/" />
        <!--<property name="suffix" value=".jsp"/>-->
    </ bean >
    
    <!--  Velocity ViewResolver Configuration -->
    < bean  id = "velocityViewResolver"  class = "org.springframework.web.servlet.view.velocity.VelocityViewResolver">
         < property  name = "order"  value = "0"  />
         < property  name = "contentType"  value = "text/html;charset=UTF-8"  />
         < property  name = "requestContextAttribute"  value = "req" />
    </ bean >
 
    <!-- Velocity Configuration -->     
    < bean  id = "velocityConfig"  class = "org.springframework.web.servlet.view.velocity.VelocityConfigurer">
         < property  name = "configLocation"  value = "/WEB-INF/velocity.properties" />
         < property  name = "resourceLoaderPath"  value = "/"  />
    </ bean >
    
    <!--  FreeMarker ViewResolver Configuration -->
    < bean  id = "freeMarkerViewResolver"  class = "org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver" >  
        < property  name = "order"  value = "0"  />
        < property  name = "viewClass"  value = "org.springframework.web.servlet.view.freemarker.FreeMarkerView" />  
    </ bean > 
    
    
    <!-- FreeMarker Configuration -->     
    < bean  id = "freemarkerConfig"   class = "org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer" >  
       < property  name = "configLocation"  value = "/WEB-INF/freemarker.properties" />
        < property  name = "templateLoaderPath"  value = "/WEB-INF/ftl/" />  
         < property  name = "freemarkerVariables" >
             < map >
                < entry  key = "xml_escape"  value-ref = "fmXmlEscape" />
            </ map >
         </ property >
    </ bean >   
    
    < bean  id = "fmXmlEscape"  class = "freemarker.template.utility.XmlEscape" />

这里我配置成全部返回.jsp的视图模板请求都转到JSP视图解析器jspViewResolver中去处理，返回.htm,.vm视图模板请求都转到velocity视图解析器中去处理。jsp

三.控制器代码示例测试

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package  com.jeedev.demo.view;
 
import  javax.servlet.http.HttpServletRequest;
 
import  org.apache.commons.logging.Log;
import  org.apache.commons.logging.LogFactory;
import  org.springframework.stereotype.Controller;
import  org.springframework.ui.ModelMap;
import  org.springframework.web.bind.annotation.RequestMapping;
 
/**
* 多视图解析器支持示例
* @author huligong
*
*/
@Controller
@RequestMapping (value =  "/demo" )
public  class  JeeDevViewResolverTestController {
    private  static  Log logger = LogFactory.getLog(JeeDevViewResolverTestController. class );
    
    @RequestMapping (value =  "/test1" )
    public  String test1(HttpServletRequest request, ModelMap map) {
        logger.info( "使用JSP视图解析器" );
        map.put( "name" ,  "hello world" );
        return  "jspTest.jsp" ;
    }
    
    @RequestMapping (value =  "/test2" )
    public  String test2(HttpServletRequest request, ModelMap map) {
        logger.info( "使用Freemarker视图解析器" );
        map.put( "name" ,  "hello world" );
        return  "hello.ftl" ;
    }
    
    @RequestMapping (value =  "/test3" )
    public  String test3(HttpServletRequest request, ModelMap map) {
        logger.info( "使用Velocity视图解析器" );
        map.put( "name" ,  "hello world" );
        return  "/html/demo.htm" ;
    }
}

四.测试请求ui

我在web.xml里给DispatcherServlet添加了/view/*，因此，只要在请求前加上/view就能够了。

http://localhost:8080/view/demo/test1

http://localhost:8080/view/demo/test2

http://localhost:8080/view/demo/test3

皆验证经过。

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