Last Updated: January 28, 2019
·
936
· phaus

Serving WebLogic LogFiles as Jersey Resource

import java.io.File;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriBuilder;

@Path("/logs")
public class LogResource  {

    private final static Logger LOGGER = Logger.getLogger(LogResource.class.getName());

    @GET
    @Produces(MediaType.TEXT_HTML)
    public Response list() {
        StringBuilder sb = new StringBuilder("<html>\n<head>\n<title>LogViewerListing</title>\n</head>\n<body>\n<ul>\n");
        String path = getLogDir();
        if (path != null) {
            File logFolder = new File(path);
            if (logFolder.exists() && logFolder.canRead()) {
                for (File f : logFolder.listFiles()) {
                    if (!f.getName().startsWith(".") && f.length() > 0L) {
                        sb.append("<li>").append("<a href=\"").append(addLogLink(f.getName())).append("\">").append(f.getName()).append("</a>").append("</li>\n");
                    }
                }
            }
        }
        sb.append("</ul>\n</body>\n</html>");
        return Response.ok(sb.toString()).build();
    }

    @GET
    @Path("/{logName}")
    public Response show(@PathParam("logName") String logName) {
        String path = getLogDir();
        if (path != null && logName != null) {
            String logFilePath = path + File.separator + logName;
            File logFile = new File(logFilePath);
            if (logFile.exists()) {
                Response.ResponseBuilder builder = Response.ok(logFile)
                        .header("Content-Disposition", "attachment; filename=" + logFile.getName())
                        .header("X-File-Name", logFile.getName())
                        .header("X-File-Size", logFile.length())
                        .header("X-File-ContentType", MediaType.TEXT_PLAIN);
                return builder.build();
            }
        }
        return Response.status(Response.Status.NOT_FOUND).build();
    }

    private String addLogLink(String logName) {
        UriBuilder builder = UriBuilder.fromPath("/logs/{logName}");
        try {
            return builder.build(URLEncoder.encode(logName, "UTF-8")).toString();
        } catch (UnsupportedEncodingException ex) {
            return "";
        }
    }

    private static String getLogDir() {
        String weblogicHome = System.getProperty("weblogic.home");
        String weblogicName = System.getProperty("weblogic.Name");
        String path = null;
        String userDir = System.getProperty("user.dir");
        if (weblogicHome != null && weblogicName != null) {
            path = userDir + File.separator + "servers" + File.separator + weblogicName + File.separator + "logs";
        } else {
            LOGGER.log(Level.WARNING, "LogFile not availibe. Maybe you do not run on Weblogic? user.dir is {0}", System.getProperty("user.dir"));
        }
        return path;
    }
}