你好，我想从 jar 中加载 css、js 等，你可以使用以下命令。
package se.lu.ldc.core.servlet;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import javax.faces.webapp.FacesServlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
/**
* Servlet för att hämta diverse filer från jar om de finns i jaren
* jpg, png, gif, css, xcss,xml,js
* @author ldc-jha
*
*/
@WebServlet(name="ldcServlet",loadOnStartup=1,urlPatterns={"*.jpg","*.png","*.gif","*.css","*.xcss","*.js"})
public class LDCFrameWorkServlet extends HttpServlet
{
//where the files are in the jar.
public final String BASE_PATH = "xhtml/framework";
private Logger log = Logger.getLogger(getClass().getName());
@Override
public void init(ServletConfig config) throws ServletException
{
System.out.println("INIT()");
super.init(config);
}
@Override
public void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
/* if this servlet is not mapped to a path, use the request URI */
String path = request.getPathInfo();
if (path == null) {
path = request.getRequestURI().substring(
request.getContextPath().length());
}
URL resource = Thread.currentThread().getContextClassLoader().
getResource(BASE_PATH+"/"+path.substring(1));
if (resource == null) {
ServletContext sc = getServletContext();
String filename = sc.getRealPath(path);
log.info("During Load:"+resource+":"+path+":"+filename);
try{
resource = sc.getResource(path);
}catch(Exception e){}
if(resource == null)
{
response.sendError(404, path + " denied");
}
}
/* failure conditions */
if (path.endsWith(".seam")) {
javax.faces.webapp.FacesServlet facesServlet = new FacesServlet();
facesServlet.service(request, response);
return;
}
if (path.endsWith(".class")) {
response.sendError(403, path + " denied");
return;
}
/* find the resource */
log.info("Looking for " + path + " on the classpath");
//response.sendError(404, path + " not found on classpath");
log.info("found " + path + " on the classpath:"+resource.toString());
/* check modification date */
URLConnection connection = resource.openConnection();
long lastModified = connection.getLastModified();
long ifModifiedSince = request.getDateHeader("If-Modified-Since");
if (ifModifiedSince != -1 && lastModified <= ifModifiedSince) {
response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
return;
}
/* write to response */
response.setContentType(getServletContext().getMimeType(path));
OutputStream out = new BufferedOutputStream(
response.getOutputStream(), 512);
InputStream in = new BufferedInputStream(
resource.openStream(), 512);
try {
int len;
byte[] data = new byte[512];
while ((len = in.read(data)) != -1) {
out.write(data, 0, len);
}
} finally {
out.close();
in.close();
if (connection.getInputStream() != null) {
connection.getInputStream().close();
}
}
} /* doGet() */
@Override
public void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
doGet(request, response);
}
}
如果你想从 jar 加载 faclets，你可以使用 Custom DefaultResourceResolver
/**
* Används för hämta hämta xhtml filer från jar filen
* @author ldc-jha
*
*/
public class ClassletsResourceResolver extends DefaultResourceResolver implements ResourceResolver{
public ClassletsResourceResolver() {
super();
}
private static final String PREFIX = "/framework/";
private static final String LAYOUT = "/layout/";
public String getPrefix() {
return PREFIX;
}
public URL resolveUrl(String path) {
final String prefix = getPrefix();
System.out.println("resolveUrl()"+path);
URL url = null;
if (path != null && path.startsWith(PREFIX)) {
final String resource = path.substring(PREFIX.length());
url = getClass().getClassLoader().getResource("xhtml/framework/"+resource);
}
if (path != null && path.startsWith(LAYOUT)) {
System.out.println("LAYOUT:"+path);
url = getClass().getClassLoader().getResource("xhtml/framework"+path);
System.out.println(url);
}
if(url != null){
return url;
}
else
{
return super.resolveUrl(path);
}
}
}
如果你想加载resourceResolver而不编辑你的xhtml，你可以这样做。
@WebListener
public class SimpleServletContextListener implements ServletContextListener{
private static final LogProvider log = Logging.getLogProvider(SimpleServletContextListener.class);
public void contextInitialized(ServletContextEvent event){
event.getServletContext().setAttribute("facelets.RESOURCE_RESOLVER","se.lu.ldc.core.reslover.ClassletsResourceResolver");
}
}
您可能还必须让 Seam 了解 Faclets，如果有任何问题请告诉我。我有同样的想法，并将所有 css、xhtml 等打包在一个 jar 中。
