java 从网络Url中下载文件

谁借莪１个温暖的怀抱￠ 2022-10-12 15:55 198阅读 0赞

/** * 从网络Url中下载文件 * @param urlStr * @param fileName * @param savePath * @throws IOException */
        public static void  downLoadFromUrl(String urlStr,String fileName,String savePath) throws IOException{ 
            URL url = new URL(urlStr);  
            HttpURLConnection conn = (HttpURLConnection)url.openConnection();  
                    //设置超时间为3秒
            conn.setConnectTimeout(3*1000);
            //防止屏蔽程序抓取而返回403错误
            conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
    
            //得到输入流
            InputStream inputStream = conn.getInputStream();  
            //获取自己数组
            byte[] getData = readInputStream(inputStream);    
    
            //文件保存位置
            File saveDir = new File(savePath);
            if(!saveDir.exists()){ 
                saveDir.mkdir();
            }
            File file = new File(saveDir+File.separator+fileName);    
            FileOutputStream fos = new FileOutputStream(file);     
            fos.write(getData); 
            if(fos!=null){ 
                fos.close();  
            }
            if(inputStream!=null){ 
                inputStream.close();
            }
    
    
            System.out.println("info:"+url+" download success"); 
    
        }
    
    
    
        /** * 从输入流中获取字节数组 * @param inputStream * @return * @throws IOException */
        public static  byte[] readInputStream(InputStream inputStream) throws IOException {   
            byte[] buffer = new byte[1024];  
            int len = 0;  
            ByteArrayOutputStream bos = new ByteArrayOutputStream();  
            while((len = inputStream.read(buffer)) != -1) {   
                bos.write(buffer, 0, len);  
            }  
            bos.close();  
            return bos.toByteArray();  
        }  
    
        public static void main(String[] args) { 
            try{ 
                downLoadFromUrl("http://101.95.48.97:8005/res/upload/interface/apptutorials/manualstypeico/6f83ce8f-0da5-49b3-bac8-fd5fc67d2725.png",
                        "百度.jpg","d:/resource/images/diaodiao/country/");
            }catch (Exception e) { 
                // TODO: handle exception
            }
        }