Spring 判断请求终端类型

今天在看spring mobile时，想通过spring为我们提供的Device接口来判断请求的终端类型

这个首先需要加入spring-mobile的jar，对应maven：

<dependency>
			<groupId>org.springframework.mobile</groupId>
			<artifactId>spring-mobile-device</artifactId>
			<version>${spring.mobile.version}</version>
		</dependency>

  当前的版本是：<spring.mobile.version>1.1.0.RELEASE</spring.mobile.version>

 

接着在spring-mvc.xml文档中添加mobile的配置，首先需要将xsd文件升级到3.2，加入视图处理，如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:jdbc="http://www.springframework.org/schema/jdbc"  
	xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:jpa="http://www.springframework.org/schema/data/jpa"
	xmlns:util="http://www.springframework.org/schema/util"   
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:mvc="http://www.springframework.org/schema/mvc" 
	xmlns:beans="http://www.springframework.org/schema/beans"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
		http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd
		http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd
		http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
		http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.1.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd"
	default-lazy-init="true">
 
 
 	<mvc:annotation-driven>
                <mvc:argument-resolvers>
                        <beans:bean class="org.springframework.mobile.device.DeviceWebArgumentResolver" />
                        <beans:bean class="org.springframework.mobile.device.site.SitePreferenceWebArgumentResolver" />
                </mvc:argument-resolvers>
 	</mvc:annotation-driven>
 	
 	<mvc:interceptors>
                <!-- On pre-handle, resolve the device that originated the web request -->
                <beans:bean class="org.springframework.mobile.device.DeviceResolverHandlerInterceptor" />
                <!-- On pre-handle, manage the user's site preference (declare after DeviceResolverHandlerInterceptor) -->
                <beans:bean class="org.springframework.mobile.device.site.SitePreferenceHandlerInterceptor" />
   </mvc:interceptors>
 	
 	
 	 <!-- 自动注册bean，排除contrller注解 -->
     <context:component-scan base-package="com.jacksoft.ispring.mvc.controller" >
     </context:component-scan>
     

        <!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources 
                directory -->
        <mvc:resources mapping="/resources/**" location="/resources/" />

        <!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
        <beans:bean class="org.springframework.mobile.device.view.LiteDeviceDelegatingViewResolver">
                <beans:constructor-arg>
                        <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                                <beans:property name="prefix" value="/WEB-INF/jsp/" />
                                <beans:property name="suffix" value=".jsp" />
                        </beans:bean>
                </beans:constructor-arg>
                <beans:property name="mobilePrefix" value="mobile/" />
                <beans:property name="tabletPrefix" value="tablet/" />
        </beans:bean>
</beans>

 

 这样可以区分平板，电脑，手机设备。

 

实际上Spring是通过org.springframework.mobile.device.DeviceResolverHandlerInterceptor 这个拦截器来获取当前访问的User-Agent，通过这个来判断具体的访问设备，然后将这个设备存放到HttpServletRequest中，这样我们就可以通过这个来进行判断了。

/*
 * Copyright 2010-2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.mobile.device;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

/**
 * A Spring MVC interceptor that resolves the Device that originated the web request <i>before</i> any request handler is invoked.
 * The resolved Device is exported as a request attribute under the well-known name of {@link DeviceUtils#CURRENT_DEVICE_ATTRIBUTE}.
 * Request handlers such as @Controllers and views may then access the currentDevice to vary their control and rendering logic, respectively.
 * @author Keith Donald
 */
public class DeviceResolverHandlerInterceptor extends HandlerInterceptorAdapter {

	private final DeviceResolver deviceResolver;

	/**
	 * Create a device resolving {@link HandlerInterceptor} that defaults to a {@link LiteDeviceResolver} implementation.
	 */
	public DeviceResolverHandlerInterceptor() {
		this(new LiteDeviceResolver());
	}
	
	/**
	 * Create a device resolving {@link HandlerInterceptor}.
	 * @param deviceResolver the device resolver to delegate to in {@link #preHandle(HttpServletRequest, HttpServletResponse, Object)}.
	 */
	public DeviceResolverHandlerInterceptor(DeviceResolver deviceResolver) {
		this.deviceResolver = deviceResolver;
	}

	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		Device device = deviceResolver.resolveDevice(request);
		request.setAttribute(DeviceUtils.CURRENT_DEVICE_ATTRIBUTE, device);
		return true;
	}

}

 

这样我们就可以在WEB-INF/jsp/ 下面创建一个test.jsp和mobile/test.jsp页面了，这样通过电脑PC来访问的时候，会自动返回WEB-INF下面的test.jsp,而通过手机来访问的时候是返回mobile/test.jsp

 

这样就可以对不同的终端进行适配了。