cn.vlabs.clb.api.io.impl.ServletOutputStream.java Source code

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Here is the source code for cn.vlabs.clb.api.io.impl.ServletOutputStream.java

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/*
 * Copyright (c) 2008-2016 Computer Network Information Center (CNIC), Chinese Academy of Sciences.
 * 
 * This file is part of Duckling project.
 *
 * 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 cn.vlabs.clb.api.io.impl;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;

public class ServletOutputStream {
    public ServletOutputStream(String agent, HttpServletResponse response) {
        this.agent = agent;
        this.response = response;
        response.setHeader("Pragma", "");
        response.setHeader("Cache-Control", "");
    }

    public ServletOutputStream(HttpServletRequest request, HttpServletResponse response) {
        this.agent = request.getHeader("user-agent");
        String range = request.getHeader("range");
        if (range != null) {
            try {
                this.startPos = Long.parseLong(range.substring(6, range.length() - 1));
            } catch (NumberFormatException e) {

            }
        }
        this.response = response;
        response.setHeader("Pragma", "");
        response.setHeader("Cache-Control", "");
    }

    public OutputStream getOutputStream() throws IOException {
        return response.getOutputStream();
    }

    public void setFileName(String fname) {
        String suffix = MimeType.getSuffix(fname);
        // response.setCharacterEncoding("UTF-8");
        // 
        response.setContentType(MimeType.getContentType(suffix));
        try {
            // ???
            if (isFirefox(agent))
                fname = javax.mail.internet.MimeUtility.encodeText(fname, "UTF-8", "B");
            else if (isIE(agent)) {
                String codedFname = URLEncoder.encode(fname, "UTF-8");
                codedFname = StringUtils.replace(codedFname, "+", "%20");
                if (codedFname.length() > 150) {
                    codedFname = new String(fname.getBytes("GBK"), "ISO8859-1");
                }
                fname = codedFname;
            } else
                fname = URLEncoder.encode(fname, "UTF-8");
            response.setHeader("Content-Disposition", "attachment;filename=\"" + fname + "\"");
        } catch (UnsupportedEncodingException e) {
        }
    }

    private boolean isFirefox(String agent) {
        return agent != null && agent.contains("Firefox");
    }

    private boolean isIE(String agent) {
        return agent != null && agent.contains("MSIE");
    }

    public long getStartPos() {
        return startPos;
    }

    private long startPos = -1;
    private HttpServletResponse response;
    private String agent;
}