SpringMVC同时支持多视图(JSP,Velocity,Freemarker等)的一种思路实现
http://www.cnblogs.com/huligong1234/p/3515747.html
在基于SpringMVC的项目中有时需要同时使用多种视图格式,如jsp,velocity及freemarker等,通过不同的请求路径配置规则,映射到不同的视图文件。下面我提供一种思路,通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, ModelMap map) {
return "demo.jsp";
}
将通过”demo.jsp”的后缀自动使用jsp的视图解析器。
下面描述下详细思路:
一.自定义视图解析器
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(通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(其实是视图中转器)中,通过对视图文件的后缀判断(而不是请求地址的后缀)而返回给不同的视图解析器处理。
二.视图映射配置dispather-servlet.xml
<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"/>
这里我配置成所有返回.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。
三.控制器代码示例
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
我在web.xml里给DispatcherServlet添加了/view/*,所以,只要在请求前加上/view就可以了。
http://localhost:8080/view/demo/test1
http://localhost:8080/view/demo/test2
http://localhost:8080/view/demo/test3
皆验证通过。