Java实现zip压缩多个文件下载

为了更好的演示，首先创建一个文件实体FileBean，包含了文件路径和文件名称：

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);

    }
　　
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Java实现zip压缩多个文件下载

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