$.Download.java Source code

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Here is the source code for $.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 ${package}.app1.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;

        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); // ??
            }
        }
    }