页面下载远程服务器单个及多个文件并打成压缩包下载到本地

如下是文件下载单个远程文件的实例

public static void main(String[] args) throws IOException {
         URL httpurl=new URL("http://yingufile-private.oss-cn-beijing.aliyuncs.com/PHYY/jpg/20170628/a85ab00c645e4b89dc38f3b8bb63a4f3");
            HttpURLConnection httpConn=(HttpURLConnection)httpurl.openConnection();
            httpConn.setDoOutput(true);// 使用 URL 连接进行输出
            httpConn.setDoInput(true);// 使用 URL 连接进行输入
            httpConn.setUseCaches(false);// 忽略缓存
            httpConn.setRequestMethod("GET");// 设置URL请求方法
            //可设置请求头
            httpConn.setRequestProperty("Content-Type", "application/octet-stream");
            httpConn.setRequestProperty("Connection", "Keep-Alive");// 维持长连接
            httpConn.setRequestProperty("Charset", "UTF-8");
            //可设置请求头


            byte[] file =input2byte(httpConn.getInputStream());
            writeBytesToFile(file,"D://333.png");
            System.out.println(file);
    }

    public static final byte[] input2byte(InputStream inStream)
            throws IOException {
        ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
        byte[] buff = new byte[100];
        int rc = 0;
        while ((rc = inStream.read(buff, 0, 100)) > 0) {
            swapStream.write(buff, 0, rc);
        }
        byte[] in2b = swapStream.toByteArray();
        return in2b;
    }

    public static File writeBytesToFile(byte[] b, String outputFile) {
        File file = null;
        FileOutputStream os = null;

        try {
            file = new File(outputFile);
            os = new FileOutputStream(file);
            os.write(b);
        } catch (Exception var13) {
            var13.printStackTrace();
        } finally {
            try {
                if(os != null) {
                    os.close();
                }
            } catch (IOException var12) {
                var12.printStackTrace();
            }

        }

        return file;
    }

递归压缩方法参考：https://www.cnblogs.com/zeng1994/p/7862288.html

整合之后代码如下：

　　　　　　　　　　String[] fids = fid.split(",");
                 System.out.println("压缩中...");
                 File zipFile = new File("C://Users//Administrator//Desktop//zipFile.zip");
                 //创建zip输出流
                 ZipOutputStream out = new ZipOutputStream( new FileOutputStream(zipFile));
                 
                 //创建缓冲输出流
                 BufferedOutputStream bos = new BufferedOutputStream(out);
                 Map<String,String> mp = new HashMap<String, String>();
                 for (String i : fids) {
                     Networkfile nf = networkfileService.selectById(Integer.parseInt(i));
                    //0移动端，1电脑
                    if("0".equals(ntype)){
                        mp.put("download_id", nf.getSf_fid());
                        mp.put("download_name", nf.getName());
                        JSONObject jsonObject = JSONObject.fromObject(mp);
                        String dates = jsonObject.toString();
                        response.getWriter().print(dates);
                    }else{
                        //调用打包函数
                        compress(out,bos,nf,nf.getName());
                    }
                 }
                    
                 mp.put("download_id", "");
                 JSONObject jsonObject = JSONObject.fromObject(mp);
                 String dates = jsonObject.toString();
                
                 response.getWriter().print(dates);
                 
                 bos.close();
                 out.close();
                 System.out.println("压缩完成");

打包函数：

/*文件打包zip*/
    public void compress(ZipOutputStream out,BufferedOutputStream bos,Networkfile nf,String base) throws Exception
    {
        //如果路径为目录（文件夹）
        if(nf.getType()==1)//文件夹sourceFile.isDirectory()
        {
            //取出文件夹中的文件（或子文件夹）
            //File[] flist = sourceFile.listFiles();
            String parameters = "uid:"+nf.getUid()+",file_pid:"+nf.getId();
            List<Networkstructure> listf = networkstructureService.selectAllFile(parameters);
            
            if(listf.size()==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点
            {
                System.out.println(base+"/");
                out.putNextEntry(  new ZipEntry(base+"/") );
            }
            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<listf.size();i++)
                {
                    Networkfile newnf = networkfileService.selectById(listf.get(i).getFid());
                    compress(out,bos,newnf,base+"/"+listf.get(i).getFile_name());
                }
            }
        }
        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
        {
            URL httpurl=new URL("http://***.***.***.**:****/"+nf.getSf_fid());
            HttpURLConnection httpConn=(HttpURLConnection)httpurl.openConnection();
            httpConn.setDoOutput(true);// 使用 URL 连接进行输出
            httpConn.setDoInput(true);// 使用 URL 连接进行输入
            httpConn.setUseCaches(false);// 忽略缓存
            httpConn.setRequestMethod("GET");// 设置URL请求方法
            //可设置请求头
            httpConn.setRequestProperty("Content-Type", "application/octet-stream");
            httpConn.setRequestProperty("Connection", "Keep-Alive");// 维持长连接
            httpConn.setRequestProperty("Charset", "UTF-8");
            //可设置请求头
            byte[] file =input2byte(httpConn.getInputStream());
            
            out.putNextEntry( new ZipEntry(base) );
            //将源文件写入到zip文件中
            out.write(file);//压缩输出
            out.closeEntry();
        }
    }