public static File downloadFileFromUrl(String urlPath, String downloadDir) {File file = null;try {// 统一资源URL url = new URL(urlPath);// 连接类的父类，抽象类URLConnection urlConnection = url.openConnection();// http的连接类HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;//设置超时httpURLConnection.setConnectTimeout(1000 * 5);//设置请求方式，默认是GEThttpURLConnection.setRequestMethod("GET");// 设置字符编码httpURLConnection.setRequestProperty("Charset", "UTF-8");// 打开到此 URL引用的资源的通信链接（如果尚未建立这样的连接）。httpURLConnection.connect();// 文件大小int fileLength = httpURLConnection.getContentLength();// 控制台打印文件大小// System.out.println("下载的文件大小为:" + fileLength / (1024 * 1024) + "MB");// 建立链接从请求中获取数据URLConnection con = url.openConnection();BufferedInputStream bin = new BufferedInputStream(httpURLConnection.getInputStream());// 指定文件名称(有需求可以自定义)String fileFullName =  urlPath.split("/")[urlPath.split("/").length - 1];// 指定存放位置(有需求可以自定义)String path = downloadDir + File.separatorChar + fileFullName;file = new File(path);// 校验文件夹目录是否存在，不存在就创建一个目录if (!file.getParentFile().exists()) {file.getParentFile().mkdirs();}OutputStream out = new FileOutputStream(file);int size = 0;int len = 0;byte[] buf = new byte[2048];while ((size = bin.read(buf)) != -1) {len += size;out.write(buf, 0, size);// 控制台打印文件下载的百分比情况// System.out.println("下载了-------> " + len * 100 / fileLength + "%\n");}// 关闭资源bin.close();out.close();System.out.println("文件下载成功！");} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();System.out.println("文件下载失败！");} finally {return file;}}