New uploaded files and Tomcat?

Question

I have a simple servlet for images uploading, a user select an image and the servlet does its job and then write it to upload directory. My project layout:

project
    ├───static
    │   ├───img
    │   └───js
    ├───upload
    └───WEB-INF
        └───lib

After uploading the image, the user is redirected to it's location:

http://localhost:8080/upload/[image MD5 hash].png

The uploading code works pretty well, but Tomcat returns 404 error when requesting the url even when the image is there:

> wget http://localhost:8080/upload/f5d1da2cadf3bd1c1b9196ec522a5d73.png
SYSTEM_WGETRC = c:/progra~1/wget/etc/wgetrc
syswgetrc = C:\GnuWin32/etc/wgetrc
--2013-01-16 03:45:33--  http://localhost:8080/upload/f5d1da2cadf3bd1c1b9196ec522a5d73.png
Resolving localhost... 127.0.0.1, ::1
Connecting to localhost|127.0.0.1|:8080... connected.
HTTP request sent, awaiting response... 404 Not Found
2013-01-16 03:45:33 ERROR 404: Not Found.
> 

After I click update classes and resources in my IDE, Intellij, it works:

> wget http://localhost:8080/upload/f5d1da2cadf3bd1c1b9196ec522a5d73.png
SYSTEM_WGETRC = c:/progra~1/wget/etc/wgetrc
syswgetrc = C:\GnuWin32/etc/wgetrc
--2013-01-16 03:48:11--  http://localhost:8080/upload/f5d1da2cadf3bd1c1b9196ec522a5d73.png
Resolving localhost... 127.0.0.1, ::1
Connecting to localhost|127.0.0.1|:8080... connected.
HTTP request sent, awaiting response... 200 OK
Length: 11666 (11K) [image/png]
Saving to: `f5d1da2cadf3bd1c1b9196ec522a5d73.png'

100%[==========================================================>] 11,666      --.-K/s   in 0s

2013-01-16 03:48:11 (72.9 MB/s) - `f5d1da2cadf3bd1c1b9196ec522a5d73.png' saved [11666/11666]
>

The second thing is that when I manualy delete this image, I still can download it (does Tomcat do some sort of cashing?):

> del f5d1da2cadf3bd1c1b9196ec522a5d73.png
> wget http://localhost:8080/upload/f5d1da2cadf3bd1c1b9196ec522a5d73.png
SYSTEM_WGETRC = c:/progra~1/wget/etc/wgetrc
syswgetrc = C:\GnuWin32/etc/wgetrc
--2013-01-16 04:12:25--  http://localhost:8080/upload/f5d1da2cadf3bd1c1b9196ec522a5d73.png
Resolving localhost... 127.0.0.1, ::1
Connecting to localhost|127.0.0.1|:8080... connected.
HTTP request sent, awaiting response... 200 OK
Length: 11666 (11K) [image/png]
Saving to: `f5d1da2cadf3bd1c1b9196ec522a5d73.png'

100%[==========================================================>] 11,666      --.-K/s   in 0s

2013-01-16 04:12:25 (93.2 MB/s) - `f5d1da2cadf3bd1c1b9196ec522a5d73.png' saved [11666/11666]
> 

My web.xml file:

<servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>/static/*</url-pattern>
    <url-pattern>/upload/*</url-pattern>
</servlet-mapping>

Could someone please tell me where is the problem?

Answer 1

This is not the right way to deal with file uploads. You should not store uploaded files in the deploy folder. You should for sure also not map the container-specific default servlet in webapp's own web.xml. You should store uploaded files in a fixed non-deploy-related folder elsewhere on the local disk file system publish it via a new <Context> in Tomcat. E.g.

<Context docBase="/var/webapp/upload" path="/upload" />

See also:

• Uploaded image only available after refreshing the page

Answer 2

when deploy in development your resouce will deploy in development resource not workspace ,and when you remove in workspace must redeploy for change in development resource

sory in my english,