java下载网络图片

场景一:指定位置批量下载图片

   public static void downloadImage(List<String> urlList,String directoryName){
        if(urlList.size() > 0){
            File file = new File("E://"+directoryName);
            if(!file.exists()){
                file.mkdirs();
            }
        }
        for(int i = 0; i< urlList.size(); ++i){
            DataInputStream dis = null;
            FileOutputStream fos = null;
            try {
                URL url = new URL(urlList.get(i));
                //打开网络输入流
                dis = new DataInputStream(url.openStream());
                String[] urlArray = urlList.get(i).split("/");
                String imageName  = urlArray[urlArray.length -1];
                String newImageName="E://"+directoryName+"//"+imageName;
                //建立一个新的文件
                 fos = new FileOutputStream(new File(newImageName));
                byte[] buffer = new byte[1024];
                int length;
                //开始填充数据
                while((length = dis.read(buffer))>0){
                    fos.write(buffer,0,length);
                }
            } catch (IOException e) {
                logger.error("下载图片出现异常:" + ExceptionUtils.getExceptionAllinformation(e));
                wirteText(urlList.get(i),failImageTXT);
            } finally {
                if(dis != null){
                    try {
                        dis.close();
                    } catch (IOException e) {
                        logger.error("关闭照片的流数据异常" + ExceptionUtils.getExceptionAllinformation(e));
                    }
                }
                if(fos != null){
                    try {
                        fos.close();
                    } catch (IOException e) {
                       logger.error("文件关闭异常" + ExceptionUtils.getExceptionAllinformation(e));
                    }
                }
            }
        }

    }