hadoop NoCacheFilter 源码
haddop NoCacheFilter 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/NoCacheFilter.java
/**
* 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.http;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class NoCacheFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain)
throws IOException, ServletException {
HttpServletResponse httpRes = (HttpServletResponse) res;
httpRes.setHeader("Cache-Control", "no-cache");
long now = System.currentTimeMillis();
httpRes.addDateHeader("Expires", now);
httpRes.addDateHeader("Date", now);
httpRes.addHeader("Pragma", "no-cache");
chain.doFilter(req, res);
}
@Override
public void destroy() {
}
}
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