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下载第三方.pdf文件，只需提供第三方下载地址即可

package cn.itcast;

import java.io.DataInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpDownload {
	private static final String REMOTE_FILE_URL = "http://211.103.156.163/201811/25051940i6ou.pdf";
	private static final String LOCAL_FILE_PATH = "D:/picture.pdf"; // 改成你保存 文件的路径  文件类型自己选择.pdf  url需要替换

	public static void main(String[] args) {
		download(REMOTE_FILE_URL, LOCAL_FILE_PATH);
	}

	  /* 注释说明
	    * try(resouces){
	    * 代码区
	     } catch (Exception e){
	               异常处理
	     }
	    // 这里的resource会自动关闭,无需在手动关闭流
	    // 1. resource 必须继承自 java.lang.AutoCloseable
	    // 2. 定义和赋值必须都在try里完成
*/
	private static void download(String remoteFileUrl, String localFilePath) {
		try {
			URL url = new URL(remoteFileUrl);

			HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
			httpURLConnection.setConnectTimeout(5 * 1000); // 5000 毫秒内没有连接上 则放弃连接
			httpURLConnection.connect(); // 连接
			System.out.println("连接 URL 成功~");

			int fileLenght = httpURLConnection.getContentLength();
			System.out.println("文件大小：" + (fileLenght / 1024.0) + " KB");

			System.out.println("开始下载...");
			try (DataInputStream dis = new DataInputStream(httpURLConnection.getInputStream());
					FileOutputStream fos = new FileOutputStream(localFilePath)) {
				byte[] buf = new byte[10240]; // 根据实际情况可以 增大 buf 大小
				for (int readSize; (readSize = dis.read(buf)) > 0;) {
					fos.write(buf, 0, readSize);
				}
				System.out.println("下载完毕~");
			} catch (IOException ex) {
				System.out.println("下载时出错");
			}

			httpURLConnection.disconnect();
		} catch (IOException ex) {
			System.out.println("URL 不存在或者连接超时");
		}
	}

}

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待续。。。。。