com.ict.nasc.tasc.app.module.screen.simple.Download.java Source code

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Here is the source code for com.ict.nasc.tasc.app.module.screen.simple.Download.java

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/*
 * Copyright (c) 2002-2012 Alibaba Group Holding Limited.
 * All rights reserved.
 *
 * Licensed 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 com.ict.nasc.tasc.app.module.screen.simple;

import static com.alibaba.citrus.util.ObjectUtil.*;
import static com.alibaba.citrus.util.StringEscapeUtil.*;
import static org.apache.commons.lang.StringUtils.*;

import java.io.PrintWriter;
import javax.servlet.http.HttpServletResponse;

import com.alibaba.citrus.service.requestcontext.buffered.BufferedRequestContext;
import com.alibaba.citrus.turbine.dataresolver.Param;
import org.springframework.beans.factory.annotation.Autowired;

/**
 *  ? 
 *
 * @author Michael Zhou
 */
public class Download {
    /**
     * 
     */
    @Autowired
    private HttpServletResponse response;

    /**
     * 
     */
    @Autowired
    private BufferedRequestContext brc;

    /**
     * 
     * 
     * @param filename
     * @throws Exception
     */
    public void execute(@Param("filename") String filename) throws Exception {
        // buffering? ???  
        brc.setBuffering(false);

        // headers?????us-ascii???? 
        filename = defaultIfNull(trimToNull(filename), "image") + ".txt";
        filename = "\"" + escapeURL(filename) + "\"";

        response.setHeader("Content-disposition", "attachment; filename=" + filename);

        // ??content type?
        // HTML?JSON?JavaScript?JPG?PDF?EXCEL 
        response.setContentType("text/plain");

        PrintWriter out = response.getWriter();

        for (int i = 0; i < 100; i++) {
            out.flush(); // ???

            for (int j = 0; j < 100000; j++) {
                out.print(i);
            }

            out.println();

            Thread.sleep(100); // ??
        }
    }
}