org.apache.struts.webapp.validator.ShowFileAction.java Source code

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Here is the source code for org.apache.struts.webapp.validator.ShowFileAction.java

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/*
 * $Id: ShowFileAction.java 421488 2006-07-13 03:43:08Z wsmoak $
 *
 * Copyright 2005 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.struts.webapp.validator;

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

import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.Log;

/**
 * Action which retrieves a file specified in the parameter
 * and stores its contents in the request, so that they
 * can be displayed.
 */
public class ShowFileAction extends Action {

    /** Logging Instance. */
    private static final Log log = LogFactory.getLog(ShowFileAction.class);

    public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request,
            HttpServletResponse response) throws Exception {

        // Get the file name
        String fileName = mapping.getParameter();
        StringBuffer fileContents = new StringBuffer();

        if (fileName != null) {

            InputStream input = servlet.getServletContext().getResourceAsStream(fileName);
            if (input == null) {
                log.warn("File Not Found: " + fileName);
            } else {
                InputStreamReader inputReader = new InputStreamReader(input);
                char[] buffer = new char[1000];
                while (true) {
                    int lth = inputReader.read(buffer);
                    if (lth < 0) {
                        break;
                    } else {
                        fileContents.append(buffer, 0, lth);
                    }
                }
            }
        } else {
            log.error("No file name specified.");
        }

        // Store the File contents and name in the Request
        request.setAttribute("fileName", fileName);
        request.setAttribute("fileContents", fileContents.toString());

        return mapping.findForward("success");
    }
}