3

我正在尝试使用 Spring Mobile,但我似乎无法让基本示例正常工作。我有一种感觉,我错过了一些非常简单的东西,但我不知道它是什么。这是我所拥有的......

在 web.xml 中

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
        /WEB-INF/applicationContext.xml
    </param-value>
</context-param> 
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<filter>
    <filter-name>deviceResolverRequestFilter</filter-name>
    <filter-class>org.springframework.mobile.device.DeviceResolverRequestFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>deviceResolverRequestFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

在 applicationContext.xml

<beans:beans xmlns="http://www.springframework.org/schema/mvc"
        xmlns:beans="http://www.springframework.org/schema/beans"
        xmlns:device="http://www.springframework.org/schema/mobile/device"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xsi:schemaLocation="http://www.springframework.org/schema/mvc 
                http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
                http://www.springframework.org/schema/beans 
                http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                http://www.springframework.org/schema/mobile/device 
                http://www.springframework.org/schema/mobile/device/spring-mobile-device-1.0.xsd">

    <!-- Interceptors that execute common control logic across multiple requests -->
    <interceptors>
        <!-- Detects the client's Device -->
        <beans:bean class="org.springframework.mobile.device.DeviceResolverHandlerInterceptor" />
    </interceptors>

</beans:beans>

在我的 Java 类中:

public class TestAction extends ActionSupport implements ServletRequestAware {

    // So that we can lookup the current Device 
    private HttpServletRequest request;

    public void setServletRequest(HttpServletRequest request) {
        this.request = request;
    }

    @Override
    public String execute() {
        Device currentDevice = DeviceUtils.getCurrentDevice(request);
        if (currentDevice.isMobile()) // <-- fails here with NPE

为什么设备未设置并导致为空?

编辑:日志文件似乎表明设置拦截器有问题,但我仍然不确定我哪里出错了。

无法将“org.springframework.mobile.device.DeviceResolverHandlerInterceptor”类型的值转换为所需的“org.springframework.web.context.request.WebRequestInterceptor”类型;嵌套异常是 java.lang.IllegalStateException:无法将类型 [org.springframework.mobile.device.DeviceResolverHandlerInterceptor] 的值转换为所需类型 [org.springframework.web.context.request.WebRequestInterceptor]:找不到匹配的编辑器或转换策略

4

2 回答 2

4

我已经看过这个并设法让它自己工作。所以我有几点意见。

1a)我认为不需要过滤器和拦截器。我刚刚使用了过滤器,这就足够了

1b) 拦截器(如果使用)应在DispatcherServletxml 配置文件中进行配置。您看起来像使用 Struts ActionSupport,这是正确的吗?如果是这样,您(可能)将没有 a DispatcherServlet,因此我认为此配置不会按预期工作。我认为这就是您获得堆栈跟踪的原因。

2)我会添加一个断点以org.springframework.mobile.device.DeviceResolverRequestFilter.doFilterInternal确保它正在执行。

3) 我会检查 Struts 没有ServletRequest. 事实上,如果可能的话,我会将您的代码移植到 vanilla Spring。

4)也许你可以ServletActionContext.getRequest在你的execute方法中使用,看看它是否有效,和/或将返回的请求与setServletRequest.


使用 Spring MVC,这对我有用。我的项目叫做 spring-mobile-test,“spring-mobile-test”是它的上下文根:

网页.xml:

<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <filter>
        <filter-name>deviceResolverRequestFilter</filter-name>
        <filter-class>org.springframework.mobile.device.DeviceResolverRequestFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>deviceResolverRequestFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <servlet>
        <servlet-name>mvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>mvc</servlet-name>
        <url-pattern>/mvc/*</url-pattern>
    </servlet-mapping>
</web-app>

applicationContext.xml 为空。

mvc-servlet.xml:

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:beans="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context"
    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">

    <context:component-scan base-package="temp" />

</beans>

temp.TestController:

package temp;

import javax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger;
import org.springframework.mobile.device.Device;
import org.springframework.mobile.device.DeviceUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class TestController {
    private static final Logger logger = Logger.getLogger(TestController.class);

    @RequestMapping("/")
    public @ResponseBody
    String home(HttpServletRequest req) {
        Device device = DeviceUtils.getCurrentDevice(req);
        String msg = "";
        if (device.isMobile()) {
            msg = "Hello mobile user!";
        } else {
            msg = "Hello desktop user!";
        }
        logger.info(msg);
        return msg;
    }
}

当我浏览到 URL 时,浏览器会显示以下文本http://localhost/spring-mobile-test/mvc/

桌面用户您好!

于 2012-06-12T22:52:12.517 回答
0

在 web.xml 中添加过滤器足以处理移动设备 etection。

1- 在 web.xml 文件中使用下面的配置。

<!--Device Resolver filter start here  -->
<filter>
       <filter-name>deviceResolverRequestFilter</filter-name>
       <filter-class>org.springframework.mobile.device.DeviceResolverRequestFilter     </filter-class>
</filter>
 <filter-mapping>
    <filter-name>deviceResolverRequestFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>  

2-添加下面的jar文件

        spring-mobile-device-1.x.x.RELEASE.jar

3-代码检查设备

        Device device=DeviceUtils.getCurrentDevice(request);
        boolean isMobile = device.isMobile();
        boolean isTablet=device.isTablet();
于 2018-04-26T05:32:38.690 回答