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I need to display an image inside the tag img.
It is a web project, running on Tomcat and Ubuntu Mate. I saved in bank as String the path to where the image is:
"/opt/imagens/img.png"
To display, I put it this way
<img src="<%=urlImg.getUrl()%>" >
urlImg.getUrl() returns "/opt/imagens/img.png"
The image does not appear, someone, please, would be able to explain to me what is wrong and what should be done to correct?
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I don’t know much about Tomcat, but I believe in its application exists the server.xml, in it there must be a place written something like:
<Host name="localhost" appBase="webapps" ...>
...
</Host>
So inside you could add:
<Host name="localhost" appBase="webapps" ...>
<Context docBase="/opt/imagens" path="/imagens" />
...
</Host>
I guess I’ll have to restart your webapp
Then after restarting the images are accessible via the HTTP path, something like:
http://localhost/imagens/1.jpg
In case, I was looking for something related to Servlets. I can’t change Tomcat settings. Even if I have to copy the image to some folder inside the application, something like that...
@Mayconstanguine has yes how to do direct by servelets, I will try to create an explanation on the subject, maybe not need to change anything.
Thank you, I’ll be waiting for your explanation.
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Thank you all, including William for your attention.
The solution found was to generate a string with the bytes of the image and display directly.
The method I created to return the string from the image file:
public static String convertPngToByteString(String path) {
String img = "";
try{
File imagem = new File(path);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
BufferedImage bi = ImageIO.read(imagem);
ImageIO.write(bi, "png", bos);
bi.flush();
byte[] imageInByte = bos.toByteArray();
bos.close();
img = DatatypeConverter.printBase64Binary(imageInByte);
} catch(Exception e) {
e.printStacktrace();
}
return img;
}
With this method, JSP displays as follows:
<img src="<%="data:image/png;Base64,"+ImagemUtil.convertPngToByteString(urlImg.getUrl())%>" width="213" height="160" id="imgFoto" />
It may not be the best way, but do what I need. =)
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If it was saved in the bank as
/opt/imagens/img.pngit makes perfect sense to show off/opt/imagens/img.png, you have to consider what is the path/route to the HTTP server, you must have created the "mapping" for the static files, no?– Guilherme Nascimento
Guilherme, I didn’t map, what would that be? This folder is outside the project, it is an operating system folder.
– Maycon Stanguine
do you know how to point the images folder to a route on Tomcat Hosts? I will try to post an answer with example, maybe it will help
– Guilherme Nascimento