hadoop WebServlet 源码
haddop WebServlet 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/WebServlet.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 java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.servlet.DefaultServlet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Hadoop DefaultServlet for serving static web content.
*/
public class WebServlet extends DefaultServlet {
private static final long serialVersionUID = 3910031415927L;
public static final Logger LOG = LoggerFactory.getLogger(WebServlet.class);
/**
* Get method is modified to support impersonation and Kerberos
* SPNEGO token by forcing client side redirect when accessing
* "/" (root) of the web application context.
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
if (request.getRequestURI().equals("/")) {
StringBuilder location = new StringBuilder();
location.append("index.html");
if (request.getQueryString()!=null) {
// echo query string but prevent HTTP response splitting
location.append("?");
location.append(request.getQueryString()
.replaceAll("\n", "").replaceAll("\r", ""));
}
response.sendRedirect(location.toString());
} else {
super.doGet(request, response);
}
}
}
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