場景:獲取一個url從下載服務端下載檔案到本地路徑
1.本例服務端可以參考, 使用Servlet實現檔案下載服務端
2.本例主要使用java.net.URL,java.net.URLConnection來實現網路連線下載

public class TestDownloadServlet {

	/**1.本地儲存已經下載的檔案目錄 */
	private static final String localPath = "E:\\download\\";
	/**2.下載url */
	private static final String url = "http://127.0.0.1:8080/study/download?filename=8195B04F2E924C2E9596AC79488351EF.zip";
	/**3.需要下載的檔名*/
	private static final String fileName = "8195B04F2E924C2E9596AC79488351EF.zip";
	
	public static void main(String[] args) {
		System.out.println("測試開始.....");
		try {
			downloadLocal(url);
		} catch (IOException e) {
			e.printStackTrace();
		}
		System.out.println("測試結束.....");
	}

	/** 4.建立請求連線並從網路流中讀取資料*/
	public static void downloadLocal(String urls) throws IOException {
		
		String local = localPath + fileName;
		URL url = new URL(urls);
		URLConnection con = url.openConnection();
		FileOutputStream out = new FileOutputStream(local);
		InputStream ins = con.getInputStream();
		byte[] b = new byte[1024 * 8];
		int i = 0;
		while ((i = ins.read(b)) != -1) {
			out.write(b, 0, i);
		}
		ins.close();
		out.close();
	}
}
 

以上,TKS.