Created grails-app /domain/csv/ | Created src In grails-app/init/ add a couple of domain class instances. outputStream. Should I invoke a flush or a close on the outpustream at the end of the closure? () or rendering/grails-app/services/grails/plugins/rendering/ protected abstract doRender(Map args, Document document, OutputStream.

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To get that accomplished, we need to wrap again:. A stream is a source or destination for a sequence of bytes. The Iterator does not close the InputStream at the end! Sign up using Email and Password.

If I recall correctly, the left shift operator here uses some annotation or something clearly I don’t remember details! The internal buffering is needed to locate the next line feed. Because Java and Groovy allow for the inclusion of graiils formatted comments in their source code, which the JavaDoc and GroovyDoc tools can extract and convert into HTML pages, those documentation pages are the core reference documentation for the class libraries.

Other outputstrema that, so far things are ok. I have found it beneficial to use some of the new ‘Groovy’ methods on the File class in particular the File. Write a single byte baos. Last updated You may need to add additional method signatures so that they can be statically compiled but the concept is the same.

Grails Programmer : How to output CSV from a Grails 3 Controller

One purpose of this tutorial is join up the two sides. It will then close all wrapped instances. I probably came across the same post CSV is probably the best format to export your data from a Grails App. Generally things are working but today we ran across a problem that seems to be shared by others but I cannot find a solution. The code now appears as response. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


If a stream or writer is wrapped like grals, only the outermost incarnation needs to be closed explicitly. Dynamic Productivity for the Java Outpitstream, author: In a controller Outtputstream have a method that appends a string to the response.

OutputStream (Groovy JDK enhancements)

Chapters detailing some of the more advanced grials of Groovy would also come before this one: To get that accomplished, we need to wrap again: Proper way to stream file from controller. The PrintWriter provides for. Closeable withCloseable Methods inherited from interface java. If they are connected to byte-oriented streams, they will need to carry out the conversion between characters and bytes as indicated by the character set encoding.

My code is rgails a little different, in that I don’t set the “Content-disposition” header and flush afterwards.

A planned series of tutorials This is the first volume of what may over time turn gfails a longer series of Groovy tutorials. I wrote a post; in Spanish though. This is the first volume of what may over time turn into a longer series of Groovy tutorials. If the answer is yes, subscribe to Groovy Calamari.

Streams, Readers and Writers

Are you facing any problems with that? Does anyone have any suggestions for me? We have fixed this problem in our applications by adding a static utility method: A Writer provides several signatures of the. The stream is closed before this method returns. Object outpufstream Closure closure Passes this OutputStream to the closure, ensuring that the stream is closed after the closure returns, regardless of errors.


This has made the conversion of a character sequence into a byte sequence and vice versa quite a bit harder.

Proper way to stream file from controller

For clear distinction between encoded and byte output PrintStream should be avoided. Hi all, I have a controller which would stream file as response. The writer is passed to the closure, and will be closed before this method returns. A CSV file is easy to import in Excel.

I will then get an IllegalStateException: Object withWriter String charset, Closure closure Creates a writer from this stream, passing it to the given closure. Writer newWriter Creates a writer for this stream.

Anyway, this is what I do and it works fairly well for me: Encapsulating functionality into classes is the key to creating libraries of reusable code. What happens is that whenever I access it, Firefox fires up Totem plugin which streams the file from the controller. I was tired of my clients asking me how to import a CSV in Excel. In the series, this would not be the first part.

I also typed the methods as void perhaps I am still too Java-fussy? On Wed, Jul 30, at 2: Sign up or log in Sign up using Google. Java has supported Unicode from its inception. Closures, operator overloading, meta programming.