标题通过DB中的主键，查出所关联的所有文件，下载压缩成zip文件

调用

public void downImgFile(HttpServletResponse response, @RequestParam(required = false) Integer did) { 
        SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmss");
        String strDate = "";
        String fileName = "";
        List<CuFileDetail> list = governmentAfairsService.ListDownData(did);
        List<String> urlList = new ArrayList<String>();
        if(list.size()==0){ 
            fileName = "未上传任何资料";//没有资料 给一个默认的文件名
        }
        logger.debug("检索图片资源："+list.get(0).getDocurl());
        for (int i = 0; i < list.size(); i++) { 
            fileName = list.get(0).getDoctitle();
            strDate = formatter.format(list.get(0).getCreatetime());
            urlList.add(resourcesUtil.getResourceUrlInside(list.get(i).getDocurl()));
            logger.debug("生成图片资源："+urlList.get(urlList.size()-1));
        }
        try { 
        	//控制文件名编码
            String filename = new String(fileName.getBytes("UTF-8"), "ISO8859-1");
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ZipOutputStream zos = new ZipOutputStream(bos);
            UrlFilesToZipUtil uzu = new UrlFilesToZipUtil();
            int idx = 1;
            for (String oneFile : urlList) { 
                String str = oneFile.substring(oneFile.lastIndexOf("."));
                zos.putNextEntry(new ZipEntry(idx+str));
                byte[] bytes = uzu.getImageFromURL(oneFile);
                zos.write(bytes, 0, bytes.length);
                zos.closeEntry();
                idx++;
            }
            zos.close();
            //设置强制下载不打开
            response.setContentType("application/force-download");
            //设置文件名
            response.addHeader("Content-Disposition", "attachment;fileName=" + filename + strDate+".zip");
            OutputStream os = response.getOutputStream();
            os.write(bos.toByteArray());
            os.close();
        } catch (FileNotFoundException ex) { 
            logger.error("FileNotFoundException", ex);
        } catch (Exception ex) { 
            logger.error("Exception", ex);
        }
    }

UrlFilesToZipUtil.java 文件 工具类

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/** * @author XiaoJunXiang * 根据文件路径下载文件压缩Zip */
public class UrlFilesToZipUtil { 
   
    private static final Logger logger = LoggerFactory.getLogger(UrlFilesToZipUtil.class);
    
 	// 根据文件链接把文件下载下来并且转成字节码
    public byte[] getImageFromURL(String urlPath) { 
        logger.error("正在读取图片="+urlPath);
        byte[] data = null;
        InputStream is = null;
        HttpURLConnection conn = null;
        try { 
            URL url = new URL(urlPath);
            conn = (HttpURLConnection)url.openConnection();
            conn.setDoInput(true);
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(10000);
            is = conn.getInputStream();
            if(conn.getResponseCode()==200){ 
                data = readInputStream(is);
            }else{ 
                data = null;
            }
        } catch (MalformedURLException e) { 
            logger.error("MalformedURLException", e);
        } catch (IOException e) { 
            logger.error("IOException", e);
        } finally { 
            try { 
                if (is != null) { 
                    is.close();
                }
            } catch (IOException e) { 
                logger.error("IOException", e);
            }
            conn.disconnect();
        }
        return data;
    }

    public byte[] readInputStream(InputStream is) { 
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int length = -1;
        try{ 
            while ((length=is.read(buffer))!=-1){ 
                baos.write(buffer, 0, length);
            }
        }catch (IOException e){ 
            logger.error("IOException", e);
        }
        byte[] data = baos.toByteArray();
        try { 
            is.close();
            baos.close();
        } catch (IOException e) { 
            logger.error("IOException", e);
        }
        return data;
    }
}