问题
I am using the following method to get a resource from WAR file in WildFly:
this.getClass().getResource(relativePath)
It works when the application is deployed as exploded WAR. It used to work with compressed WAR, too. Yesterday, I did a clean and rebuild of project in Eclipse, and it just stopped working.
When I check the resource root:
logger.info(this.getClass().getResource("/").toExternalForm());
I get this:
file:/C:/JBoss/wildfly8.1.0.CR1/modules/system/layers/base/org/jboss/as/ejb3/main/timers/
So, no wonder it doesn't work. It probably has something to do with JBoss module loading, but I don't know if this is a bug or normal behavior.
I found various similar problems on StackOverflow, but no applicable solution. One of the suggestions is to use ServletContext like so:
@Resource
private WebServiceContext wsContext;
...
ServletContext servletContext = (ServletContext)this.wsContext.getMessageContext()
.get(MessageContext.SERVLET_CONTEXT);
servletContext.getResource(resourcePath);
But, when I try to obtain MessageContext in this manner, I get an IllegalStateException. So I am basically stuck. Any ideas?
回答1:
I ran into this same problem, and rather than define the resource as a shared module, I ended up working around this by using a ServletContextListener in my WAR.
In the contextInitialized method, I got the ServletContext from the ServletContextEvent and used its getResource("/WEB-INF/myResource") to get the URL to the resource inside my WAR file. It appears that in the ServletContextListener, the .getResource() method resolves as expected rather than to the "/modules/system/layers/base/org/jboss/as/ejb3/main/timers/" url. That URL can then be stored in the ServletContext for later use by your servlets or in an injected ApplicationScoped CDI bean.
@WebListener
public class ServletInitializer implements ServletContextListener {
@Override
public void contextInitialized(ServletContextEvent sce) {
try {
final ServletContext context = sce.getServletContext();
final URL resourceUrl = context.getResource("/WEB-INF/myResource");
context.setAttribute("myResourceURL", resourceUrl);
} catch (final MalformedURLException e) {
throw new AssertionError("Resource not available in WAR file", e);
}
}
@Override
public void contextDestroyed(ServletContextEvent sce) {}
}
or
@WebListener
public class ServletInitializer implements ServletContextListener {
@Inject
private SomeApplicationScopedBean myBean;
@Override
public void contextInitialized(ServletContextEvent sce) {
try {
final ServletContext context = sce.getServletContext();
final URL resourceUrl = context.getResource("/WEB-INF/myResource");
myBean.setResourceUrl(resourceUrl);
} catch (final MalformedURLException e) {
throw new AssertionError("Resource not available in WAR file", e);
}
}
@Override
public void contextDestroyed(ServletContextEvent sce) {}
}
回答2:
We had a similar problem and our fault was that we tried to access the static resource through the raw path instead of using the input stream the resource is providing - the following code works for us even when deploying a non-exploded .war-file.
final URL resource = this.getClass().getResource(FILE);
try (final InputStream inputStream = resource.openStream();
final InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
final BufferedReader bufferedReader = new BufferedReader(inputStreamReader)) {
// Use bufferedReader to read the content
} catch (IOException e) {
// ...
}
回答3:
I finally gave up and put my resource files in a new JBoss module, as described in this link.
https://community.jboss.org/wiki/HowToPutAnExternalFileInTheClasspath
It works, but the downside is that there are two deployment targets so things are more complicated. On the upside, the size of the WAR file is reduced, and I don't have to redeploy the application if only some of the resources have changed.
回答4:
I was recently trying to figure out how to access a file within my own war in Java. The following is how the java classes and resources are packaged in the war file:
WAR
`-- WEB-INF
`-- classes (where all the java classes are)
`-- resourcefiles
`-- resourceFile1
My target file was resourceFile1. To get that file, I just did the following in code:
InputStream inStream = this.class.getClassLoader().getResourceAsStream("resourcefiles/resourceFile1");
In this case the resource files would need to be in the same folder as the classes folder containing the java classes. Hopefully others find this helpful.
回答5:
This sample code works for wildfly deployed and tested on openshift. I think it is a wildfly problem I downland wildfly and tried on local I also get the error.
Check sample project on github
import org.springframework.web.bind.annotation.RequestMethod;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLConnection;
@Controller
@RequestMapping
public class FileDownloadController {
private static final Logger logger = LoggerFactory.getLogger(FileDownloadController.class);
private static final String DOC_FILE = "file/ibrahim-karayel.docx";
private static final String PDF_FILE = "file/ibrahim-karayel.pdf";
@RequestMapping(value = "/download/{type}", method = RequestMethod.GET)
public void downloadFile(HttpServletRequest request, HttpServletResponse response,
@PathVariable("type") String type) throws IOException {
File file = null;
InputStream inputStream;
if (type.equalsIgnoreCase("doc")) {
inputStream = getClass().getClassLoader().getResourceAsStream(DOC_FILE);
file = new File(Thread.currentThread().getContextClassLoader().getResource(DOC_FILE).getFile());
} else if (type.equalsIgnoreCase("pdf")) {
inputStream = getClass().getClassLoader().getResourceAsStream(PDF_FILE);
file = new File(Thread.currentThread().getContextClassLoader().getResource(PDF_FILE).getFile());
} else{
throw new FileNotFoundException();
}
if (file == null && file.getName() == null) {
logger.error("File Not Found -> " + file);
throw new FileNotFoundException();
}
String mimeType = URLConnection.guessContentTypeFromName(file.getName());
if (mimeType == null) {
System.out.println("mimetype is not detectable, will take default");
mimeType = "application/octet-stream";
}
System.out.println("mimetype : " + mimeType);
response.setContentType(mimeType);
/* "Content-Disposition : inline" will show viewable types [like images/text/pdf/anything viewable by browser] right on browser
while others(zip e.g) will be directly downloaded [may provide save as popup, based on your browser setting.]*/
response.setHeader("Content-Disposition", String.format("inline; filename=\"" + file.getName() + "\""));
/* "Content-Disposition : attachment" will be directly download, may provide save as popup, based on your browser setting*/
//response.setHeader("Content-Disposition", String.format("attachment; filename=\"%s\"", file.getName()));
response.setContentLength(inputStream.available());
IOUtils.copy(inputStream, response.getOutputStream());
response.flushBuffer();
inputStream.close();
}
}
回答6:
Had the same issue with Wildfly and not-exploded WAR and using Spring and ServletContextResource I have got around it like this:
[org.springframework.core.io.]Resource resource = new ServletContextResource(servletContext, "WEB-INF/classes/resource.png");
In the same @Service class I also had:
@Inject
private ServletContext servletContext;
来源：https://stackoverflow.com/questions/23845031/wildfly-getting-resource-from-war