java批量下载，将多文件打包成zip格式下载

Posted 2020-10-08 有点懒惰的大青年

现在的需求的：

根据产品族、产品类型，下载该产品族、产品类型下面的pic包；

pic包是zip压缩文件；

t_product表：

这些包以blob形式存在另一张表中：

t_imagefile表：

现在要做的是：将接入网、OLT下面的两个包downloadPIC：MA5800系列-pic.zip 和 MA5900-pic.rar一起打包成zip压缩文件下载下来；

 

代码：

ProductController.java:

    /**
     * 根据产品族、产品类型下载照片包
     */
    @RequestMapping("/downloadwBatch")
    public void downloadwBatch(HttpServletRequest request, HttpServletResponse response, String productFamily, String productType){
        //http://localhost:8080/MySSM/downloadwBatch?productFamily=接入网&productType=OLT
        try {
            productFamily = new String(productFamily.getBytes("iso-8859-1"), "utf-8");
            productType = new String(productType.getBytes("iso-8859-1"), "utf-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        
        //获取要下载的照片包名
        Map<String, String> params = new HashMap<String, String>();
        params.put("productFamily", productFamily);
        params.put("productType", productType);
        List<String> packageNames = productService.getPackageNamesByFamilyAndType(params);
        
        //根据包名获取待下载的文件    文件名-字节数组的形式
        Map<String, byte[]> files = new HashMap<String, byte[]>();
        for(String packageName : packageNames){
            byte[] f = productService.getPackage(packageName);
            if(f!=null){
                files.put(packageName, f);
            }
        }
        
        //设置下载的压缩包名
        String zipName = productFamily + "_"+ productType + ".zip";
        
        //根据文件，进行压缩，批量下载
        if(files.size() > 0){
            productService.downloadBatchByFile(response, files, zipName);
        }
        
    }

ProductService.java:

    /**
     * 根据包名获取文件
     */
    public byte[] getPackage(String packageName){
        byte[] bag  = null;
        try{
            ImageFile m = productMapper.getPackage(packageName);
            if(m!=null){
                bag = m.getPicture();
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        return bag;
    }
    
    
    /**
     * 根据产品族、产品类型 获取待下载的包名
     * @param params
     * @return
     */
    public List<String> getPackageNamesByFamilyAndType(Map<String, String> params) {
        List<String> packageNames = productMapper.getPackageNamesByFamilyAndType(params);
        
        return packageNames;
    }
    
    /**
     * 根据文件，进行压缩，批量下载
     * @param response
     * @param files
     * @throws Exception 
     */
    public void downloadBatchByFile(HttpServletResponse response, Map<String, byte[]> files, String zipName){
        try{
            response.setContentType("application/x-msdownload");
            response.setHeader("content-disposition", "attachment;filename="+URLEncoder.encode(zipName, "utf-8"));
            
            ZipOutputStream zos = new ZipOutputStream(response.getOutputStream());
            BufferedOutputStream bos = new BufferedOutputStream(zos);
            
            for(Entry<String, byte[]> entry : files.entrySet()){
                String fileName = entry.getKey();            //每个zip文件名
                byte[]    file = entry.getValue();            //这个zip文件的字节
                
                BufferedInputStream bis = new BufferedInputStream(new ByteArrayInputStream(file));
                zos.putNextEntry(new ZipEntry(fileName));
                
                int len = 0;
                byte[] buf = new byte[10 * 1024];
                while( (len=bis.read(buf, 0, buf.length)) != -1){
                    bos.write(buf, 0, len);
                }
                bis.close();
                bos.flush();
            }
            bos.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }

ProductMapper.java:

    /**
     * 根据包名获取文件
     */
    public ImageFile getPackage(String packageName) throws Exception;

    /**
     * 据产品族、产品类型 获取待下载的包名
     */
    public List<String> getPackageNamesByFamilyAndType(Map<String, String> params);

View Code

ProductMapper.xml:

    <!-- 根据包名获取文件 -->
    <select id="getPackage" parameterType="java.lang.String" resultType="com.cy.model.ImageFile">
        select * from t_imagefile where packageName = #{packageName}
    </select>
    
    <!--  跟据产品族、产品类型 获取待下载的包名 -->
    <select id="getPackageNamesByFamilyAndType" parameterType="java.util.Map" resultType="java.lang.String">
        select packageName from t_imagefile m join t_product p on m.packageName = p.downloadPic
        where p.productFamily = #{productFamily} and p.productType = #{productType}
    </select>

View Code

 

测试：

在浏览器中输入：http://localhost:8080/MySSM/downloadwBatch?productFamily=接入网&productType=OLT

下载结果如下：

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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