Re: How do I send program generated Images to my users?
The remote service servlets used by RPC have code in them to prevent GET requests from doing anything. As was said before, if your images are small (or you don't care about IE) you can return the image as a data URI (google is your friend here) and when you get the response simply do: new Image(myImageDataURI); Another option would be to save your image (either to the filesystem, or datastore) using some sort of identifier (hash maybe) Then use a separate HTTPServlet to return this image something like: /GetImage?ID=someid But your original idea should have worked as well ... GWT.getModuleBaseURL()+imageName module base url is the location of the Module.js file used in the host page. There is also GWT.getHostPageBaseURL() which is the location of the Host HTML page (which may be different than the module's location) -jason On Oct 26, 2010, at 3:18 PM, Greg Dougherty wrote: Thank you Thomas. Given what I'm trying to do, I need to have the Image created via a GWT RPC call. However, nothing keeps me from implementing doGet () within my servlet, so I did that, and now I can serve up the images cleanly, and I can even cache them! :-) Greg On Oct 26, 11:26 am, Thomas Broyer t.bro...@gmail.com wrote: On 26 oct, 16:18, Greg Dougherty dougherty.greg...@mayo.edu wrote: - Generate the image with a servlet on the fly (return the appropriate mime type and the image) or (if the images are small) Great idea. HOW DO I DO THAT? Sorry for the shouting, but I'm already generating the things on the fly. If I knew how to return them other than as a file, I'd already be doing that. I've got a GWT client and a GWT Servlet. The GWT Servlet has an image sitting in its memory. I want to get that image to the client. If you can give me sample code, point me to sample code, or point me to a well documented Java function, that would be great, and you would have my full appreciation. Telling me to do X' is pointless, if you don't give me some way of figuring out how to DO that X. Because if I knew how to do it, I would have already done it, and not wasted everyone's time with these questions. The thing is: instead of calling your servlet through GWT-RPC or whatever (anything implemented above XMLHttpRequest) to generate the image; generate the call through a new Image(), passing the arguments in the URL. Your servlet will then be a bare HttpServlet (no GWT involved, just implement de doGet method) and you'd send the image back using the HttpServletResponse's OutputStream (after setting the HttpServletResponse's content-type to the appropriate value, for instance image/png). To get the arguments on the server-side, if you passed them in the query string, then HttpServletRequest#getParameter will work seamlessly. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: How do I send program generated Images to my users?
if your servlet generates an image, why do you want to get it saved on the disk? I'd also do it the way Daniel suggested, so just keep your image generating servlet as standalone, better yet allow extensions so you can inquire an image not only like /imageGenerator but / imageGenerator.jpg, then you also dont need to explicitely generate mime header. so in web.xml you map your generator: servlet-mapping .. url-pattern/imageGenerator/*/url-pattern /servlet-mapping and later, if telling the url of the image in the GWT module, you dont build the url with getModuleBaseUrl(), but rather use host-relative url, like new Image(/imageGenerator/whatever.jpg) you can pass the values to your generator either via url params (/ imageGenerator/image.jpg?name=star) or via pathInfo (/imageGenerator/ image/name/star.jpg) On 25 Okt., 22:36, Greg Dougherty dougherty.greg...@mayo.edu wrote: Hi all, My servlet is creating images that I need to send to the client. My first thought was save the image to a file, then send the path to that image to the client, which can then call new Image (GWT.getModuleBaseURL () + imagePath); This worked just fine in the development environment. But when I deploy to Tomcat, if I try to use a relative path, it does it from where Tomcat was started, rather than from my module's base. For obvious reasons, I'd prefer not to try to save images to a hard-coded path (makes it a bit difficult to move the app around). Is there a clean way to get my module's base path, so I can save the images relative to that? If not, what IS the approved way to pass program generated images to the client? TIA, Greg -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: How do I send program generated Images to my users?
- Generate the image with a servlet on the fly (return the appropriate mime type and the image) or (if the images are small) Great idea. HOW DO I DO THAT? Sorry for the shouting, but I'm already generating the things on the fly. If I knew how to return them other than as a file, I'd already be doing that. I've got a GWT client and a GWT Servlet. The GWT Servlet has an image sitting in its memory. I want to get that image to the client. If you can give me sample code, point me to sample code, or point me to a well documented Java function, that would be great, and you would have my full appreciation. Telling me to do X' is pointless, if you don't give me some way of figuring out how to DO that X. Because if I knew how to do it, I would have already done it, and not wasted everyone's time with these questions. Thank you, Greg On Oct 26, 12:42 am, Daniel Kurka kurka.dan...@googlemail.com wrote: Hi Greg, from my point of view there are to ways of doing this: - Generate the image with a servlet on the fly (return the appropriate mime type and the image) or (if the images are small) - you can encode them using base64 and set them as data in an image url Hope that helps - Daniel Kurka 2010/10/25 Greg Dougherty dougherty.greg...@mayo.edu Hi all, My servlet is creating images that I need to send to the client. My first thought was save the image to a file, then send the path to that image to the client, which can then call new Image (GWT.getModuleBaseURL () + imagePath); This worked just fine in the development environment. But when I deploy to Tomcat, if I try to use a relative path, it does it from where Tomcat was started, rather than from my module's base. For obvious reasons, I'd prefer not to try to save images to a hard-coded path (makes it a bit difficult to move the app around). Is there a clean way to get my module's base path, so I can save the images relative to that? If not, what IS the approved way to pass program generated images to the client? TIA, Greg -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.comgoogle-web-toolkit%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: How do I send program generated Images to my users?
On 26 oct, 16:18, Greg Dougherty dougherty.greg...@mayo.edu wrote: - Generate the image with a servlet on the fly (return the appropriate mime type and the image) or (if the images are small) Great idea. HOW DO I DO THAT? Sorry for the shouting, but I'm already generating the things on the fly. If I knew how to return them other than as a file, I'd already be doing that. I've got a GWT client and a GWT Servlet. The GWT Servlet has an image sitting in its memory. I want to get that image to the client. If you can give me sample code, point me to sample code, or point me to a well documented Java function, that would be great, and you would have my full appreciation. Telling me to do X' is pointless, if you don't give me some way of figuring out how to DO that X. Because if I knew how to do it, I would have already done it, and not wasted everyone's time with these questions. The thing is: instead of calling your servlet through GWT-RPC or whatever (anything implemented above XMLHttpRequest) to generate the image; generate the call through a new Image(), passing the arguments in the URL. Your servlet will then be a bare HttpServlet (no GWT involved, just implement de doGet method) and you'd send the image back using the HttpServletResponse's OutputStream (after setting the HttpServletResponse's content-type to the appropriate value, for instance image/png). To get the arguments on the server-side, if you passed them in the query string, then HttpServletRequest#getParameter will work seamlessly. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: How do I send program generated Images to my users?
Thank you Thomas. Given what I'm trying to do, I need to have the Image created via a GWT RPC call. However, nothing keeps me from implementing doGet () within my servlet, so I did that, and now I can serve up the images cleanly, and I can even cache them! :-) Greg On Oct 26, 11:26 am, Thomas Broyer t.bro...@gmail.com wrote: On 26 oct, 16:18, Greg Dougherty dougherty.greg...@mayo.edu wrote: - Generate the image with a servlet on the fly (return the appropriate mime type and the image) or (if the images are small) Great idea. HOW DO I DO THAT? Sorry for the shouting, but I'm already generating the things on the fly. If I knew how to return them other than as a file, I'd already be doing that. I've got a GWT client and a GWT Servlet. The GWT Servlet has an image sitting in its memory. I want to get that image to the client. If you can give me sample code, point me to sample code, or point me to a well documented Java function, that would be great, and you would have my full appreciation. Telling me to do X' is pointless, if you don't give me some way of figuring out how to DO that X. Because if I knew how to do it, I would have already done it, and not wasted everyone's time with these questions. The thing is: instead of calling your servlet through GWT-RPC or whatever (anything implemented above XMLHttpRequest) to generate the image; generate the call through a new Image(), passing the arguments in the URL. Your servlet will then be a bare HttpServlet (no GWT involved, just implement de doGet method) and you'd send the image back using the HttpServletResponse's OutputStream (after setting the HttpServletResponse's content-type to the appropriate value, for instance image/png). To get the arguments on the server-side, if you passed them in the query string, then HttpServletRequest#getParameter will work seamlessly. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
How do I send program generated Images to my users?
Hi all, My servlet is creating images that I need to send to the client. My first thought was save the image to a file, then send the path to that image to the client, which can then call new Image (GWT.getModuleBaseURL () + imagePath); This worked just fine in the development environment. But when I deploy to Tomcat, if I try to use a relative path, it does it from where Tomcat was started, rather than from my module's base. For obvious reasons, I'd prefer not to try to save images to a hard-coded path (makes it a bit difficult to move the app around). Is there a clean way to get my module's base path, so I can save the images relative to that? If not, what IS the approved way to pass program generated images to the client? TIA, Greg -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: How do I send program generated Images to my users?
Hi Greg, from my point of view there are to ways of doing this: - Generate the image with a servlet on the fly (return the appropriate mime type and the image) or (if the images are small) - you can encode them using base64 and set them as data in an image url Hope that helps - Daniel Kurka 2010/10/25 Greg Dougherty dougherty.greg...@mayo.edu Hi all, My servlet is creating images that I need to send to the client. My first thought was save the image to a file, then send the path to that image to the client, which can then call new Image (GWT.getModuleBaseURL () + imagePath); This worked just fine in the development environment. But when I deploy to Tomcat, if I try to use a relative path, it does it from where Tomcat was started, rather than from my module's base. For obvious reasons, I'd prefer not to try to save images to a hard-coded path (makes it a bit difficult to move the app around). Is there a clean way to get my module's base path, so I can save the images relative to that? If not, what IS the approved way to pass program generated images to the client? TIA, Greg -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.comgoogle-web-toolkit%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
