java zip压缩下载

使用org.apache.tools.zip.ZipOutputStream

压缩

import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class CompressZip {
    public static void ZipCompress(String inputFile, String outputFile) throws Exception {
        //创建zip输出流
        ZipOutputStream out = new ZipOutputStream(new FileOutputStream(outputFile));
        //创建缓冲输出流
        BufferedOutputStream bos = new BufferedOutputStream(out);
        File input = new File(inputFile);
        if (input.isDirectory()) {
            //取出文件夹中的文件（或子文件夹）
            File[] flist = input.listFiles();
            if (flist.length >0){
                for (int i = 0; i < flist.length; i++) {
                    compress(out, bos, flist[i], null);
                }
            }
        }
        bos.close();
        out.close();
    }
    /**
     * @param name 压缩文件名，可以写为null保持默认
     */
    //递归压缩
    public static void compress(ZipOutputStream out, BufferedOutputStream bos, File input, String name) throws IOException {
        if (name == null) {
            name = input.getName();
        }
        bos.flush();
        //如果路径为目录（文件夹）
        if (input.isDirectory()) {
            //取出文件夹中的文件（或子文件夹）
            File[] flist = input.listFiles();

            if (flist.length == 0)//如果文件夹为空，则只需在目的地zip文件中写入一个目录进入
            {
                out.putNextEntry(new ZipEntry(name + "/"));
            } else//如果文件夹不为空，则递归调用compress，文件夹中的每一个文件（或文件夹）进行压缩
            {
                for (int i = 0; i < flist.length; i++) {
                    compress(out, bos, flist[i], name + "/" + flist[i].getName());
                }
            }
        } else//如果不是目录（文件夹），即为文件，则先写入目录进入点，之后将文件写入zip文件中
        {
            out.putNextEntry(new ZipEntry(name));
            FileInputStream fos = new FileInputStream(input);
            BufferedInputStream bis = new BufferedInputStream(fos);
            int len;
            //将源文件写入到zip文件中
            byte[] buf = new byte[1024];
            while ((len = bis.read(buf)) != -1) {
                bos.write(buf,0,len);
            }
            bis.close();
            fos.close();
        }
    }

    public static void main(String[] args) {
        try {
            String path = "E:\\data\\down";
            String fileName = "data" + new SimpleDateFormat("yyyyMMddHHmmss").format(new Date())+".zip";
            ZipCompress(path, "E:\\data\\test\\"+fileName);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

下载

@RequestMapping("/downloadZip")
    public void downloadZip(HttpServletRequest req, HttpServletResponse resp, String name) {
        try {
            // path是指欲下载的文件的路径。
            File file = new File("E:\\data\\test\\"+name+".zip");
            // 取得文件名。
            String filename = file.getName();
            String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();
            InputStream fis = new BufferedInputStream(new FileInputStream(file));
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            // 清空response
            resp.reset();
            // 设置response的Header
            resp.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));
            resp.addHeader("Content-Length", "" + file.length());
            OutputStream toClient = new BufferedOutputStream(resp.getOutputStream());
            resp.setContentType("application/octet-stream");
            toClient.write(buffer);
            toClient.flush();
            toClient.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }