Java通过URL类下载图片的实例代码
星空彼岸007 人气:0Java通过URL类下载图片
一、概述
URL(Uniform Resource Locator) :统一资源定位符,它表示 Internet 上 某一 资源 的地址。 它是一种具体的 URI ,即 URL 可以用来标识一个资源,而且还指明了如何 locate 这个资源。 通过 URL 我们可以访问 Internet 上的各种网络资源,比如最常见的 www , ftp 站点。浏览器通过解析给定的 URL 可以在网络上查找相应的文件或其他资源。 URL 的基本结构由 5 部分组成: < 传输协议 >://< 主机名 >:< 端口号 >/< 文件名 ># 片段名 ? 参数列表
二、通过URL下载图片
HttpsURLConnection httpsURLConnection = null; InputStream is = null; FileOutputStream fos = null; try { //1.创建URL对象 URL url = new URL("https://img.qb5200.com/download-x/zhongzhuanl9/jb/20230320/irxgxz4h5qv.jpg")); //4.输出图片 byte[] buffer = new byte[1024]; int len; while ((len = is.read(buffer)) != -1) { fos.write(buffer, 0, len); } } catch (IOException e) { e.printStackTrace(); } finally { //5.关闭资源 try { if (is != null) is.close(); } catch (IOException e) { e.printStackTrace(); } try { if (fos != null) fos.close(); } catch (IOException e) { e.printStackTrace(); } if (httpsURLConnection != null) httpsURLConnection.disconnect(); }
扩展:java通过url获取图片文件
1. 根据url下载Url中的图片
import java.net.URL; import java.io.InputStream; import java.io.FileOutputStream; public class ImageDownloader { public static void main(String[] args) throws Exception { // URL of the image to download String imageUrl = "https://example.com/image.jpg"; // Create URL object and open input stream to the image URL url = new URL(imageUrl); InputStream inputStream = url.openStream(); // Output stream to save the image to file FileOutputStream outputStream = new FileOutputStream("image.jpg"); // Read bytes from the input stream and write to the output stream byte[] buffer = new byte[2048]; int length; while ((length = inputStream.read(buffer)) != -1) { outputStream.write(buffer, 0, length); } // Close streams inputStream.close(); outputStream.close(); System.out.println("Image downloaded successfully."); } }
2. 根据get请求url下载Url中的图片
import java.net.URL; import java.io.InputStream; import java.io.FileOutputStream; public class ImageDownloader { public static void main(String[] args) throws Exception { // URL of the image to download String imageUrl = "https://example.com/image.jpg"; // Create URL object and open input stream to the image URL url = new URL(imageUrl); InputStream inputStream = url.openStream(); // Output stream to save the image to file FileOutputStream outputStream = new FileOutputStream("image.jpg"); // Read bytes from the input stream and write to the output stream byte[] buffer = new byte[2048]; int length; while ((length = inputStream.read(buffer)) != -1) { outputStream.write(buffer, 0, length); } // Close streams inputStream.close(); outputStream.close(); System.out.println("Image downloaded successfully."); } }
3. 考虑url中携带中文,需要做转义
imageUrl = URLEncoder.encode(imageUrl, "utf-8") .replaceAll("%3A", ":") .replaceAll("%2F", "/") .replaceAll("%2C", ",") .replaceAll("%7B", "{") .replaceAll("%3F","?") .replaceAll("%7D", "}") .replaceAll("%26","&") .replaceAll("%3D","="); //new一个URL对象 URL url = new URL(imageUrl);
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