Add VelocityProperties.preferFilesystemAccess

Update VelocityProperties to include a preferFilesystemAccess attribute.

Fixes gh-1652

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/velocity/VelocityAutoConfiguration.java

@@ -81,6 +81,7 @@ public class VelocityAutoConfiguration {
 
 		protected void applyProperties(VelocityEngineFactory factory) {
 			factory.setResourceLoaderPath(this.properties.getResourceLoaderPath());
+			factory.setPreferFileSystemAccess(this.properties.isPreferFileSystemAccess());
 			Properties velocityProperties = new Properties();
 			velocityProperties.putAll(this.properties.getProperties());
 			factory.setVelocityProperties(velocityProperties);

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/velocity/VelocityProperties.java

@@ -48,6 +48,8 @@ public class VelocityProperties extends AbstractTemplateViewResolverProperties {
 
 	private String toolboxConfigLocation;
 
+	private boolean preferFileSystemAccess = true;
+
 	public VelocityProperties() {
 		super(DEFAULT_PREFIX, DEFAULT_SUFFIX);
 	}
@@ -92,6 +94,14 @@ public class VelocityProperties extends AbstractTemplateViewResolverProperties {
 		this.toolboxConfigLocation = toolboxConfigLocation;
 	}
 
+	public boolean isPreferFileSystemAccess() {
+		return this.preferFileSystemAccess;
+	}
+
+	public void setPreferFileSystemAccess(boolean preferFileSystemAccess) {
+		this.preferFileSystemAccess = preferFileSystemAccess;
+	}
+
 	@Override
 	public void applyToViewResolver(Object viewResolver) {
 		super.applyToViewResolver(viewResolver);