Java批量下载图片：http（无额外jar）

一、前言

一个简单的java批量下载图片示例，速度有些慢，不过勉强可用。

二、结构

三 、代码

main

package lyrics.download; import java.io.IOException; import lyrics.download.Service.DownloadService; /** * DownloadTest * * @author lyrics * @since 2020/07/04 */ public class DownloadTest { /** * main * * @param args arguments * @author lyrics * @since 2020/07/04 */ public static void main(String[] args) { DownloadService downloadService = new DownloadService(); String url = "https://picsum.photos/300/150/?image="; String path = "D:\\picture\\"; for(int i = 0; i<100;i++) { try { if(!downloadService.download(url+i, path)) { System.out.println("Download failed!"); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("pciture "+i+" Download successful!"); } } }

下载服务

package lyrics.download.Service; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; /** * DownloadService * * @author lyrics * @since 2020/07/04 */ public class DownloadService { public boolean download(String uri, String path) throws IOException { URL url = new URL(uri); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); conn.setUseCaches(false); conn.setConnectTimeout(5000); conn.connect(); String fileName = uri.substring(uri.lastIndexOf("=") + 1)+".jpg"; File file = new File(path + "\\" + fileName); if(!file.exists()) { file.createNewFile(); } FileOutputStream fileOutputStream = new FileOutputStream(file); InputStream input = conn.getInputStream(); int len = 0; byte[] data = new byte[1024]; while((len = input.read(data))!=-1) { fileOutputStream.write(data, 0, len); } fileOutputStream.close(); input.close(); return true; } }

四、测试

五、最后

晚安，代码如有建议，请不吝赐教，也请大家多多包涵！！