1.Action 代码
/*
* $Id: ShowFileAction.java 471754 2006-11-06 14:55:09Z husted $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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);
}
}
}
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