Java实现zip压缩多个文件下载

来源：互联网发布：周易取名软件破解版编辑：程序博客网时间：2024/06/03 21:39

转载http://www.cnblogs.com/yzuzhang/p/4763606.html

package com.javaweb.entity;import java.io.Serializable;/** * 文件实体类*/public class FileBean implements Serializable{        private static final long serialVersionUID = -5452801884470115159L;        private Integer fileId;//主键        private String filePath;//文件保存路径        private String fileName;//文件保存名称        public FileBean(){            }           //Setters and Getters ...}

接下来，在控制层的方法里(示例为Spring MVC)，进行读入多个文件List<FileBean>，压缩成myfile.zip输出到浏览器的客户端：

    /**     * 打包压缩下载文件     */    @RequestMapping(value = "/downLoadZipFile")    public void downLoadZipFile(HttpServletResponse response) throws IOException{        String zipName = "myfile.zip";        List<FileBean> fileList = fileService.getFileList();//查询数据库中记录        response.setContentType("APPLICATION/OCTET-STREAM");          response.setHeader("Content-Disposition","attachment; filename="+zipName);        ZipOutputStream out = new ZipOutputStream(response.getOutputStream());        try {            for(Iterator<FileBean> it = fileList.iterator();it.hasNext();){                FileBean file = it.next();                ZipUtils.doCompress(file.getFilePath()+file.getFileName(), out);                response.flushBuffer();            }        } catch (Exception e) {            e.printStackTrace();        }finally{            out.close();        }    }

最后，附上ZipUtils压缩文件的工具类，这样便实现了多文件的压缩下载功能:

import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.util.zip.ZipEntry;import java.util.zip.ZipOutputStream;public class ZipUtils {        private ZipUtils(){    }        public static void doCompress(String srcFile, String zipFile) throws IOException {        doCompress(new File(srcFile), new File(zipFile));    }        /**     * 文件压缩     * @param srcFile 目录或者单个文件     * @param zipFile 压缩后的ZIP文件     */    public static void doCompress(File srcFile, File zipFile) throws IOException {        ZipOutputStream out = null;        try {            out = new ZipOutputStream(new FileOutputStream(zipFile));            doCompress(srcFile, out);        } catch (Exception e) {            throw e;        } finally {            out.close();//记得关闭资源        }    }        public static void doCompress(String filelName, ZipOutputStream out) throws IOException{        doCompress(new File(filelName), out);    }        public static void doCompress(File file, ZipOutputStream out) throws IOException{        doCompress(file, out, "");    }        public static void doCompress(File inFile, ZipOutputStream out, String dir) throws IOException {        if ( inFile.isDirectory() ) {            File[] files = inFile.listFiles();            if (files!=null && files.length>0) {                for (File file : files) {                    String name = inFile.getName();                    if (!"".equals(dir)) {                        name = dir + "/" + name;                    }                    ZipUtils.doCompress(file, out, name);                }            }        } else {             ZipUtils.doZip(inFile, out, dir);        }    }        public static void doZip(File inFile, ZipOutputStream out, String dir) throws IOException {        String entryName = null;        if (!"".equals(dir)) {            entryName = dir + "/" + inFile.getName();        } else {            entryName = inFile.getName();        }        ZipEntry entry = new ZipEntry(entryName);        out.putNextEntry(entry);                int len = 0 ;        byte[] buffer = new byte[1024];        FileInputStream fis = new FileInputStream(inFile);        while ((len = fis.read(buffer)) > 0) {            out.write(buffer, 0, len);            out.flush();        }        out.closeEntry();        fis.close();    }        public static void main(String[] args) throws IOException {        doCompress("D:/java/", "D:/java.zip");    }    }

其他：spring mvc 下载普通单个文件的方法：

    @RequestMapping(value = "/downloadFile")    @ResponseBody    public void downloadFile (HttpServletResponse response) {          OutputStream os  = null;          try {　　　　　　　os = response.getOutputStream();　　　　　　　File file = new File("D:/javaweb/demo.txt");　　　　　　　// Spring工具获取项目resources里的文件　　　　　　　File file2 = ResourceUtils.getFile("classpath:shell/init.sh");            if(!file.exists()){　　　　　　　　　　return;　　　　　　　}            response.reset();            response.setHeader("Content-Disposition", "attachment;filename=demo.txt");            response.setContentType("application/octet-stream; charset=utf-8");            os.write(FileUtils.readFileToByteArray(file));        } catch (Exception e) {            e.printStackTrace();        }finally{            IOUtils.closeQuietly(os);        }            }

补充，另外一种利用 ResponseEntity<byte[]> 实现下载单个文件的方法：

    /**     * Spring下载文件     * @param request     * @throws IOException      */    @RequestMapping(value="/download")    public ResponseEntity<byte[]> download(HttpServletRequest request) throws IOException{　　　　 // 获取项目webapp目录路径下的文件        String path = request.getSession().getServletContext().getRealPath("/");        File file = new File(path+"/soft/javaweb.txt");        HttpHeaders headers = new HttpHeaders();          headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);        headers.setContentDispositionFormData("attachment", "javaweb.txt");        return new ResponseEntity<byte[]>(org.apache.commons.io.FileUtils.readFileToByteArray(file),headers, HttpStatus.CREATED);    }　　   <a target="_blank" href="/download">点击下载</a>

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