impl/src/main/java/org/apache/myfaces/webapp/SourceCodeServlet.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.myfaces.webapp;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class SourceCodeServlet extends HttpServlet 
{
    public void doGet(HttpServletRequest req, HttpServletResponse res)
        throws IOException, ServletException
    {
        String webPage = req.getServletPath();
        
        // remove the '*.source' suffix that maps to this servlet
        int chopPoint = webPage.indexOf(".source");
        
        webPage = webPage.substring(0, chopPoint - 1);
        webPage += "p"; // replace jsf with jsp
        
        // get the actual file location of the requested resource
        String realPath = getServletConfig().getServletContext().getRealPath(webPage);

        // output an HTML page
        res.setContentType("text/plain");

        // print some html
        ServletOutputStream out = res.getOutputStream();

        // print the file
        InputStream in = null;
        try 
        {
            in = new BufferedInputStream(new FileInputStream(realPath));
            int ch;
            while ((ch = in.read()) !=-1) 
            {
                out.print((char)ch);
            }
        }
        finally
        {
            if (in != null)
            {
                in.close();  // very important
            }
        }
    }
}