问题
I want Undertow to serve static files like .jpg, .png, .js, .css, .txt etc...
I edited the undertow subsystem in standalone.xml:
<subsystem xmlns="urn:jboss:domain:undertow:4.0">
<buffer-cache name="default"/>
<server name="default-server">
<http-listener name="default" socket-binding="http" redirect-socket="https" enable-http2="true"/>
<https-listener name="https" socket-binding="https" security-realm="ApplicationRealm" enable-http2="true"/>
<host name="default-host" alias="localhost">
<location name="/images" handler="sh-resources"/>
<filter-ref name="server-header"/>
<filter-ref name="x-powered-by-header"/>
<filter-ref name="content-png" predicate="path-suffix['.png']"/>
<http-invoker security-realm="ApplicationRealm"/>
</host>
</server>
<servlet-container name="default">
<jsp-config/>
<websockets/>
</servlet-container>
<handlers>
<file name="sh-resources" path="/resource" directory-listing="true"/>
</handlers>
<filters>
<response-header name="server-header" header-name="Server" header-value="WildFly/11"/>
<response-header name="x-powered-by-header" header-name="X-Powered-By" header-value="Undertow/1"/>
<response-header name="content-png" header-name="Content-Type" header-value="image/png"/>
</filters>
</subsystem>
I hav some files in my "/resource" folder "1.jpg", "2.png", "js.js", "c.css" in:
http://localhost:8080/resource/1.jpg --> shows nothing in browser
http://localhost:8080/resource/2.png --> shows nothing in browser
http://localhost:8080/resource/js.js --> shows nothing in browser
http://localhost:8080/resource/c.css --> shows file content in browser
http://localhost:8080/resource/test.html --> shows file content in browser
Why cant I see the images but can see the css & html content ? I think its because of incorrect mimetype setting ?
PS: I tried serving the static files via a Servlet and setting the correct Mimetypes -> everything works perfectly in browser (chrome) I can see the images and .js content (and all other file endings).
My Servlet Code (app is running at "/" of server):
@WebFilter("/*") //get all requests
public class MasterFilter implements javax.servlet.Filter {
//...
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
String path = req.getRequestURI();
if (path.startsWith("/resource")) {
String mimetype = "text/html;charset=UTF-8";
mimetype = path.contains(".png") ? "image/png" : mimetype;
mimetype = path.contains(".jpg") || path.contains(".jpeg") ? "image/jpeg" : mimetype;
mimetype = path.contains(".js") ? "text/javascript" : mimetype;
mimetype = path.contains(".css") ? "text/css" : mimetype;
response.setContentType(mimetype);
chain.doFilter(request, response); // Goes to static resource in local folder "webapp/resource/"
}
}
Any suggestions ? Thanks in advance.
EDIT:
The above solution with the Servlet Filter works fine. But thanks to @JGlass's answer I also found another solution. (keep in mind that I absolutely need my Servlet Filter):
"MasterFilter" class forwards to "ServeResource" servlet:
@WebFilter("/*") public class MasterFilter implements javax.servlet.Filter { /*...*/ public void doFilter(..){ /*...*/ if (path.startsWith("/resource")) {//forward to "ServeResource" servlet } } }
2."ServeResource" servlet serves static file:
@WebServlet("/resource/*")
public class ServeResource extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public ServeResource() {
super();
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
response)
*/
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
ServletContext cntx= req.getServletContext();
String fileUri = req.getRequestURI();
System.out.println("fileUri: "+fileUri);
// Get the absolute path of the image (or any file)
String filename = cntx.getRealPath(fileUri);
System.out.println("file realPath: "+filename);
// retrieve mimeType dynamically
String mime = cntx.getMimeType(filename);
System.out.println("mime type: "+mime);
if (mime == null) {
resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
resp.setContentType(mime);
File file = new File(filename);
resp.setContentLength((int)file.length());
FileInputStream in = new FileInputStream(file);
OutputStream out = resp.getOutputStream();
// Copy the contents of the file to the output stream
byte[] buf = new byte[1024];
int count = 0;
while ((count = in.read(buf)) >= 0) {
out.write(buf, 0, count);
}
out.close();
in.close();
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
3.web.xml contains extension mappings:
<mime-mapping>
<extension>html</extension>
<mime-type>text/html</mime-type>
</mime-mapping>
<mime-mapping>
<extension>txt</extension>
<mime-type>text/plain</mime-type>
</mime-mapping>
<mime-mapping>
<extension>js</extension>
<mime-type>text/javascript</mime-type>
</mime-mapping>
<mime-mapping>
<extension>jpg</extension>
<mime-type>image/jpeg</mime-type>
</mime-mapping>
<mime-mapping>
<extension>jpeg</extension>
<mime-type>image/jpeg</mime-type>
</mime-mapping>
<mime-mapping>
<extension>png</extension>
<mime-type>image/png</mime-type>
</mime-mapping>
<mime-mapping>
<extension>css</extension>
<mime-type>text/css</mime-type>
</mime-mapping>
<mime-mapping>
<extension>zip</extension>
<mime-type>application/zip</mime-type>
</mime-mapping>
回答1:
You can put your mime-types mapping in your web.xml. Here's an example:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
id="WebApp_ID" version="3.1">
<display-name>TestDynamicWAR</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>testServlet</servlet-name>
<servlet-class>com.mycompany.test.TestServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>testServlet</servlet-name>
<url-pattern>/test</url-pattern>
</servlet-mapping>
<mime-mapping>
<extension>html</extension>
<mime-type>text/html</mime-type>
</mime-mapping>
<mime-mapping>
<extension>txt</extension>
<mime-type>text/plain</mime-type>
</mime-mapping>
<mime-mapping>
<extension>jpg</extension>
<mime-type>image/jpeg</mime-type>
</mime-mapping>
<mime-mapping>
<extension>png</extension>
<mime-type>image/png</mime-type>
</mime-mapping>
<mime-mapping>
<extension>js</extension>
<mime-type>text/plain</mime-type>
</mime-mapping>
<mime-mapping>
<extension>css</extension>
<mime-type>text/css</mime-type>
</mime-mapping>
</web-app>
Note: you likely don't need the css and js as they're already working. html and txt mime types are just an example as well
And I dont believe you need to deal with the servlet filter if you just want to handle the mime-types. This SO post has the servlet dealing with the mime types Output an image file from a servlet
来源：https://stackoverflow.com/questions/48659014/wildfly-undertow-file-mimetypes