server:
    port: 8090
    contextPath: /zpa

@Configuration
public class StaticResourceConfiguration extends WebMvcConfigurerAdapter {
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/pngFiles/**")
        .addResourceLocations("file:ext-resources/")
        .setCachePeriod(0);
    }

<img src="build/resources/main/static/images/zpl-1.png" >

public class StaticResourceConfiguration extends WebMvcConfigurerAdapter{
@Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {

        String filePath = "E:/AshokParmar/Project/imges/";
        registry.addResourceHandler("/img/qrcode/**")
        .addResourceLocations("file:/"+filePath)
        .setCachePeriod(0);
    }
}
in html file use below tags it works
<img src="<c:url value="/img/qrcode/0012340012.png" />"/>