Java实现Zip压缩文件并可以下载

以你之姓@ 2022-05-28 07:48 299阅读 0赞

1、项目需求：将多个文件打包后，放到本地，提供下载的需求。

2、实现思路：使用org.apache.tools.zip.ZipOutputStream。

3、实现代码：

（1）做一个压缩的工具类

package com.thinkgem.jeesite.modules.data.utils;  
  
import java.io.BufferedInputStream;    
import java.io.File;    
import java.io.FileInputStream;    
import java.io.FileOutputStream;    
import java.util.zip.CRC32;    
import java.util.zip.CheckedOutputStream;    
import java.util.zip.ZipEntry;    
import java.util.zip.ZipOutputStream;    
   
public class ZipCompressor \{       
   static final int BUFFER = 8192;       
     
   private File zipFile;       
       
   public ZipCompressor(String pathName) \{       
       zipFile = new File(pathName);       
   \}       
   public void compress(String... pathName) \{     
       ZipOutputStream out = null;       
       try \{      
           FileOutputStream fileOutputStream = new FileOutputStream(zipFile);       
           CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream,       
                   new CRC32());       
           out = new ZipOutputStream(cos);       
           String basedir = "";     
           for (int i=0;i<pathName.length;i++)\{    
               compress(new File(pathName\[i\]), out, basedir);       
           \}    
           out.close();      
       \} catch (Exception e) \{       
           throw new RuntimeException(e);       
       \}     
   \}       
   public void compress(String srcPathName) \{       
       File file = new File(srcPathName);       
       if (!file.exists())       
           throw new RuntimeException(srcPathName + "不存在！");       
       try \{       
           FileOutputStream fileOutputStream = new FileOutputStream(zipFile);       
           CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream,       
                   new CRC32());       
           ZipOutputStream out = new ZipOutputStream(cos);       
           String basedir = "";       
           compress(file, out, basedir);       
           out.close();       
       \} catch (Exception e) \{       
           throw new RuntimeException(e);       
       \}       
   \}       
     
   private void compress(File file, ZipOutputStream out, String basedir) \{       
       /\* 判断是目录还是文件 \*/      
       if (file.isDirectory()) \{       
           System.out.println("压缩：" + basedir + file.getName());       
           this.compressDirectory(file, out, basedir);       
       \} else \{       
           System.out.println("压缩：" + basedir + file.getName());       
           this.compressFile(file, out, basedir);       
       \}       
   \}       
     
   /\*\* 压缩一个目录 \*/      
   private void compressDirectory(File dir, ZipOutputStream out, String basedir) \{       
       if (!dir.exists())       
           return;       
     
       File\[\] files = dir.listFiles();       
       for (int i = 0; i < files.length; i++) \{       
           /\* 递归 \*/      
           compress(files\[i\], out, basedir + dir.getName() + "/");       
       \}       
   \}       
     
   /\*\* 压缩一个文件 \*/      
   private void compressFile(File file, ZipOutputStream out, String basedir) \{       
       if (!file.exists()) \{       
           return;       
       \}       
       try \{       
           BufferedInputStream bis = new BufferedInputStream(       
                   new FileInputStream(file));       
           ZipEntry entry = new ZipEntry(basedir + file.getName());       
           out.putNextEntry(entry);       
           int count;       
           byte data\[\] = new byte\[BUFFER\];       
           while ((count = bis.read(data, 0, BUFFER)) != -1) \{       
               out.write(data, 0, count);       
           \}       
           bis.close();       
       \} catch (Exception e) \{       
           throw new RuntimeException(e);       
       \}       
   \}       
  public static void main(String\[\] args) \{       
       ZipCompressor zc = new ZipCompressor("E:/resource/resource.zip");       
       zc.compress("E:/resource/js","E:/resource/css","E:/resource/images");      
   \}    
\}

（2）调用该类

//存放Zip文件的路径  
        String path = fileRoot + productService.getCode() + productService.getTypeCode() + ".zip";  
          
        File file = new File(path);  
        if(!file.exists()) \{//需要打包的多个文件的路径  
            String\[\] str = (String\[\])strArray.toArray(new String\[strArray.size()\]);  
            ZipCompressor zc = new  ZipCompressor(path);  
            zc.compress(str);  
        \}

（3）提供下载的方法

@RequestMapping(value = "downLoadZipFile")  
    public void estampDown(HttpServletRequest request, HttpServletResponse response) \{    
       
        try \{    
            String code = request.getParameter("code");  
            String typeCode = request.getParameter("typeCode");  
            String fileRoot = Global.getConfig("fileRoot");  
            String path = fileRoot + code + typeCode + ".zip";  
              
            File file = new File(path); // 要下载的文件绝对路径    
            InputStream ins;      
  
            ins = new BufferedInputStream(new FileInputStream(file));    
  
            byte\[\] buffer = new byte\[ins.available()\];    
            ins.read(buffer);    
            ins.close();    
  
            response.reset();    
            response.addHeader("Content-Disposition", "attachment;filename="+ new String(file.getName().getBytes()));    
            response.addHeader("Content-Length", "" + file.length());    
            OutputStream ous = new BufferedOutputStream(response.getOutputStream());    
            response.setContentType("application/octet-stream");    
            ous.write(buffer);    
            ous.flush();    
            ous.close();    
                
        \} catch (Exception e) \{    
            e.printStackTrace();    
        \}    
    \}