/**
* 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.hadoop.util;
import java.io.*;
import java.util.Calendar;
import javax.servlet.*;
public class ServletUtil {
/**
* Initial HTML header
*/
public static PrintWriter initHTML(ServletResponse response, String title
) throws IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>\n"
+ "<link rel='stylesheet' type='text/css' href='/static/hadoop.css'>\n"
+ "<title>" + title + "</title>\n"
+ "<body>\n"
+ "<h1>" + title + "</h1>\n");
return out;
}
/**
* Get a parameter from a ServletRequest.
* Return null if the parameter contains only white spaces.
*/
public static String getParameter(ServletRequest request, String name) {
String s = request.getParameter(name);
if (s == null) {
return null;
}
s = s.trim();
return s.length() == 0? null: s;
}
public static final String HTML_TAIL = "<hr />\n"
+ "<a href='http://hadoop.apache.org/core'>Hadoop</a>, "
+ Calendar.getInstance().get(Calendar.YEAR) + ".\n"
+ "</body></html>";
/**
* HTML footer to be added in the jsps.
* @return the HTML footer.
*/
public static String htmlFooter() {
return HTML_TAIL;
}
}