java 高效率图片url转base64

你可以使用Java的Base64类将图片的URL转换为Base64编码。以下是一个简单的示例代码：

import java.io.*;
import java.net.*;
import java.util.Base64;

public class ImageToBase64 {
  public static void main(String[] args) throws Exception {
    String imgUrl = "<your image URL>";
    URL url = new URL(imgUrl);
    
    //read image from URL
    ByteArrayOutputStream output = new ByteArrayOutputStream();
    try (InputStream inputStream = url.openStream()) {
      byte[] buffer = new byte[1024];
      int n = 0;
      while (-1 != (n = inputStream.read(buffer))) {
        output.write(buffer, 0, n);
      }
    }
    
    //encode image to Base64 string
    String base64Image = Base64.getEncoder().encodeToString(output.toByteArray());
    
    System.out.println(base64Image);
  }
}

替换 `<your image URL>` 部分为你自己的图片URL，运行该程序将获得你所需的Base64编码。