CODEWITHSUNDEEP
javaspring-mvc
Anil Kumar Pandey
Anil Kumar Pandey

Reputation: 1927

Spring Web MVC: How to change viewResolver prefix according to client request

I have two folders inside my WEB-INF directory 1st is views which has desktop website related template files and 2nd one mobile_views has mobile website template. I am using WebConfiguration class file and define required @Bean functions. Now I want to change the viewResolver.setPrefix(viewFolderName) according to the request. If user hits the website from mobile so will set mobile_views otherwise It will views. So I am detecting the device browser and setting the viewFolderName but seems to work only one time because WebConfiguration class getting accessed when server starts, that's why I am facing this problem. Here is my code, please give me some solution for this.

@Bean
public ViewResolver viewResolver() {
    InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
    viewResolver.setViewClass( JstlView.class );
    if(isRequestFromMobile()) viewResolver.setPrefix("/WEB-INF/mobile_views/");
    else viewResolver.setPrefix("/WEB-INF/views/");
    viewResolver.setSuffix(".jsp");
    return viewResolver;
}

private @Autowired HttpServletRequest request;
private boolean isRequestFromMobile() {
    String userAgent = request.getHeader("User-Agent");
    String httpAccept = request.getHeader("Accept");
    UAgentInfo detector = new UAgentInfo(userAgent, httpAccept);
    System.out.println("### User Agent: "+userAgent);
    if (detector.detectMobileQuick()) {
        return true;
    }
    return false;
}

Upvotes: 2

Views: 2895

Answers (1)

geoand
geoand

Reputation: 64039

Take a look at this tutorial from Spring's site that depends on Spring Boot.

The meat is that you need to configure DeviceResolverHandlerInterceptor and DeviceHandlerMethodArgumentResolver.

Once that is done, you can use the controller method's Device argument to differentiate the handling depending on the device

A step further from that point would be to integrate LiteDeviceDelegatingViewResolver (provided by Spring Mobile) in the following manner:

@Bean
public LiteDeviceDelegatingViewResolver liteDeviceAwareViewResolver() {
    InternalResourceViewResolver delegate = 
            new InternalResourceViewResolver();
    delegate.setPrefix("/WEB-INF/views/");
    delegate.setSuffix(".jsp");
    LiteDeviceDelegatingViewResolver resolver = 
            new LiteDeviceDelegatingViewResolver(delegate);
    resolver.setMobilePrefix("mobile/");
    resolver.setTabletPrefix("tablet/");
    return resolver;
}

Upvotes: 2

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