本篇内容介绍了“Java怎么通过URL类下载图片”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
Java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://cache.yisu.com/upload/information/20230222/112/3816.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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