filedownloadservlet.java

web版的SVN客户端

/*
 * Copyright (c) 2004, 2005 Polarion Software, All rights reserved.
 * Email: [e-mail]
 *
 * This program and the accompanying materials are made available under the
 * terms of the Apache License, Version 2.0 (the "License"). You may not use
 * this file except in compliance with the License. Copy of the License is
 * located in the file LICENSE.txt in the project distribution. You may also
 * obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 *
 * POLARION SOFTWARE MAKES NO REPRESENTATIONS OR WARRANTIES
 * ABOUT THE SUITABILITY OF THE SOFTWARE, EITHER EXPRESSED OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. POLARION SOFTWARE
 * SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT
 * OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 */
package org.polarion.svnwebclient.web.servlet;

import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.polarion.svnwebclient.SVNWebClientException;
import org.polarion.svnwebclient.configuration.ConfigurationProvider;
import org.polarion.svnwebclient.data.IDataProvider;
import org.polarion.svnwebclient.data.model.DataFileElement;
import org.polarion.svnwebclient.web.support.RequestHandler;

/**
 * 
 * @author <A HREF="mailto:[e-mail]">Polarion Software </A>
 */
public class FileDownloadServlet extends AbstractServlet {
    private static final long serialVersionUID = -5061766135434675105L;
    
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.execute(request, response);
    }
    
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.execute(request, response);
    }    
    
    protected void executeSVNOperation(IDataProvider dataProvider) throws SVNWebClientException {
        OutputStream outStream = null;
        try {
            long revision = dataProvider.getHeadRevision();
            if (this.requestHandler.getCurrentRevision() != -1) {
                revision = this.requestHandler.getCurrentRevision();
            }
            String url = this.requestHandler.getUrl();
            if (this.requestHandler.getPegRevision() != -1) {
                url = dataProvider.getLocation(this.requestHandler.getUrl(), this.requestHandler.getPegRevision(), revision);
            }
           
            DataFileElement fileElement = dataProvider.getFile(url, revision);
            String fileName = fileElement.getName();
            String defaultEncoding = ConfigurationProvider.getInstance().getDefaultEncoding();
            fileName = new String(fileName.getBytes(defaultEncoding),"ISO-8859-1");
            String mimeType = this.getServletContext().getMimeType(fileName.toLowerCase());
            if (mimeType == null) {
                mimeType = "application/Octet-stream";
            }
            this.state.getResponse().setContentType(mimeType);
            if(this.requestHandler.isAttachment()) {
                this.state.getResponse().setHeader("Content-Disposition", "attachment; filename=" + fileName);                
            } else {
                this.state.getResponse().setHeader("Content-Disposition", "inline; filename=" + fileName);                
            }

            outStream = this.state.getResponse().getOutputStream();
            byte[] content = fileElement.getContent();
            outStream.write(content, 0, content.length);
            outStream.flush();
        } catch (SVNWebClientException ex) {
            try {
                this.state.getResponse().sendError(HttpServletResponse.SC_NOT_FOUND);
            } catch (Exception e) {
                throw new SVNWebClientException(e);                
            }
        } catch (Exception e) {
            throw new SVNWebClientException(e);
        } finally {
            if (outStream != null) {
                try {
                    outStream.close();
                } catch (Exception e) {
                    Logger.getInstance(FileDownloadServlet.class).error(e, e);
                }
            }
        }
    }

    protected RequestHandler getRequestHandler(HttpServletRequest request) {
        return new RequestHandler(request);
    }   
}