Spring Boot images uploading and serving

To access image from your images folder,

You need to override addResourceHandlers method of WebMvcConfigurerAdapter class like this:

@Configuration
public class ResourceConfig extends WebMvcConfigurerAdapter {
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/images/**").addResourceLocations("file:images/");
    }
}

After that you need add / before images in URL like this:

<img th:src="@{'/images/' + ${post.imageName}}"/>

Per default your Spring Boot application serves static content - in your case images - found at following locations:

• /static
• /public
• /resources
• /META-INF/resources

So usually, static/images/ would perhaps be the place where Thymeleaf should expect the static images which have to be delivered for rendering. But since this place is about static content and since it is in general a bad idea to save uploaded (dynamic) content inside your application I would recommend to DON'T do that. Did you think about what happens if your application is redeployed or moved to another machine? Your would have to backup / move the images in a cumbersome way. There are better solutions, storing the upload content at a separate location outside your app (which could for example be configurable and also reused by multiple instances) or even use a database to store image data. That would also enable handling images in a transactional context (e.g. isolation & rollbacks).

But If you now want to still store it inside your app, your can extend the locations by adding places to search for (actually static content). Although the answer of Ajit and even the documentation still gives the advice to extend your own WebMvcConfigurerAdapter, I personally would tend to implement WebMvcConfigurer instead, because the former is deprecated.

In this case it should look like:

@Configuration
public class AdditionalResourceWebConfiguration implements WebMvcConfigurer {
    @Override
    public void addResourceHandlers(final ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/images/**").addResourceLocations("file:images/");
    }
}