Java怎么下载压缩包

本篇内容主要讲解"Java怎么下载压缩包"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"Java怎么下载压缩包"吧!

package com.golden.crm.web.util;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import java.util.List;import java.util.zip.ZipEntry;import java.util.zip.ZipOutputStream;/** * 下载zip工具类 */public class ZipUtil {    private static final Logger logger = LoggerFactory.getLogger(ZipUtil.class);    /**     * 生成Zip文件     */    public static void generateZipFile(HttpServletResponse response, List fileUrl, String fileName) throws IOException {        ZipOutputStream zipOut = new ZipOutputStream(response.getOutputStream());        for (int i = 0; i < fileUrl.size(); i++) {            zipOut.putNextEntry(new ZipEntry(System.currentTimeMillis() + ".jpg"));            InputStream stream = this.getInputStreamByUrl(fileUrl.get(i));            if (null == stream) {                continue;            }            int temp = 0;            while ((temp = stream.read()) != -1) {                zipOut.write(temp);            }            stream.close();        }        zipOut.closeEntry();        zipOut.close();    }    /**     * 通过url读取图片信息     */    public static InputStream getInputStreamByUrl(String url) {        InputStream ins = null;        try {            URL url_ = new URL(url);            HttpURLConnection conn = (HttpURLConnection) url_.openConnection();            conn.setConnectTimeout(3 * 1000);            conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");            ins = conn.getInputStream();        } catch (IOException e) {            logger.info("图片读取失败!-->" + e);        }        return ins;    }    /**     * 导出Zip文件     */    public static void exportZipFile(String fileName, List fileUrl, HttpServletResponse response, HttpServletRequest request) {        try {            // 浏览器处理乱码问题            String userAgent = request.getHeader("User-Agent");            // filename.getBytes("UTF-8")处理safari的乱码问题            byte[] bytes = userAgent.contains("MSIE") ? fileName.getBytes() : fileName.getBytes("UTF-8");            // 各浏览器基本都支持ISO编码            fileName = new String(bytes, "ISO-8859-1");            // 文件名外的双引号处理firefox的空格截断问题            response.setHeader("Content-disposition", String.format("attachment; filename=\"%s\"", fileName));            response.setContentType("application/x-msdownload");            response.setCharacterEncoding("UTF-8");            response.setHeader("Content-Disposition", "attachment;filename=" + fileName);            this.generateZipFile(response, fileUrl, fileName);        } catch (Exception e) {            logger.info("下载失败！-->" + e);        }    }}

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