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(List<FileBean> fileList, HttpServletResponse response) throws IOException{
        String zipName = "myfile.zip";
        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.zipFile(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;

/** 
* 压缩文件工具类
*/
public class ZipUtils {
    
    public static void doCompress(String srcFile, String zipFile) throws Exception {
        doCompress(new File(srcFile), new File(zipFile));
    }
    
    /**
     * 文件压缩
     * @param srcFile  目录或者单个文件
     * @param destFile 压缩后的ZIP文件
     */
    public static void doCompress(File srcFile, File destFile) throws Exception {
        ZipOutputStream out = new ZipOutputStream(new FileOutputStream(destFile));
        if(srcFile.isDirectory()){
            File[] files = srcFile.listFiles();
            for(File file : files){
                doCompress(file, out);
            }
        }else {
            doCompress(srcFile, out);
        }
    }
    
    public static void doCompress(String pathname, ZipOutputStream out) throws IOException{
        doCompress(new File(pathname), out);
    }
    
    public static void doCompress(File file, ZipOutputStream out) throws IOException{
        if( file.exists() ){
            byte[] buffer = new byte[1024];
            FileInputStream fis = new FileInputStream(file);
            out.putNextEntry(new ZipEntry(file.getName()));
            int len = 0 ;
            // 读取文件的内容,打包到zip文件    
            while ((len = fis.read(buffer)) > 0) {
                out.write(buffer, 0, len);
            }
            out.flush();
            out.closeEntry();
            fis.close();
        }
    }
    
}

 

普通单个文件的下载方法：

    @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/sinit.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);
        }
        
    }

另外一种下载方法ResponseEntity<byte[]>：

    /**
     * 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.zip");
        HttpHeaders headers = new HttpHeaders();  
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        headers.setContentDispositionFormData("attachment", "javaweb.zip");
        return new ResponseEntity<byte[]>(org.apache.commons.io.FileUtils.readFileToByteArray(file),headers, HttpStatus.CREATED);
    }
　　
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