java网上下载文件

￡神魔★判官ぃ 2024-04-18 08:05 41阅读 0赞

#### java下载文件 ####

*  1.使用httpClient下载文件：

/* *url:资源的地址：http://***.**.***.**.a.mp4 * */
    public void downLoadFile(String url) throws IOException { 
    
            // 生成一个httpclient对象
            CloseableHttpClient httpclient = Usual.httpClient;
            HttpGet httpget = new HttpGet(url);
            HttpResponse response = httpclient.execute(httpget);
            HttpEntity entity = response.getEntity();
            InputStream in = entity.getContent();
    
            File file = new File("D://zcq/b.mp4");//这里为存储路径/xx/xx..
    
            FileOutputStream fout = new FileOutputStream(file);
            int a = -1;
            byte[] tmp = new byte[1024];
            while ((a = in.read(tmp)) != -1) { 
                fout.write(tmp, 0, a);
                //注意这里如果用OutputStream.write(buff)的话，图片会失真，大家可以试试
            }
            fout.flush();
            fout.close();
            in.close();
            httpclient.close();
    
        }

*  1.

public static boolean httpDownload(String httpUrl, String saveFile) { 
            // 1.下载网络文件
            int byteRead;
            URL url;
            try { 
                url = new URL(httpUrl);
            } catch (MalformedURLException e1) { 
                e1.printStackTrace();
                return false;
            }
    
            try { 
                //2.获取链接
                URLConnection conn = url.openConnection();
                //3.输入流
                InputStream inStream = conn.getInputStream();
                //3.写入文件
                FileOutputStream fs = new FileOutputStream(saveFile);
    
                byte[] buffer = new byte[1024];
                while ((byteRead = inStream.read(buffer)) != -1) { 
                    fs.write(buffer, 0, byteRead);
                }
                inStream.close();
                fs.close();
                return true;
            } catch (FileNotFoundException e) { 
                e.printStackTrace();
                return false;
            } catch (IOException e) { 
                e.printStackTrace();
                return false;
            }
        }
    
    
        public static void main(String[] args) { 
            httpDownload("http://***.***.***/hanghaibaolei.mp4","D://shg.mp4");
        }