网络图片URL内容进行Base64处理

原文链接:http://106.13.94.122/to/blog/streamline?uuid=179

实现步骤

(1)请求URL获取图片资源
(2)得到图片的二进制数据,以二进制封装得到数据
(3)对字节数组Base64编码

工具类

import org.apache.commons.lang3.StringUtils;
import sun.misc.BASE64Encoder;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/***
 * 图片处理工具类
 **/
public class ImageUtil {

    /***
     * 将图片文件转化为字节数组字符串,并对其进行Base64编码处理
     * @param imgUrl 图片的网络URL
     * @return
     */
    public static String encodeImageToBase64(String imgUrl) {

        if (StringUtils.isBlank(imgUrl)) {
            return null;
        }

        URL url;
        HttpURLConnection conn;
        try {
            url = new URL(imgUrl);
            conn = (HttpURLConnection) url.openConnection();
            // 设置Http请求头为GET
            conn.setRequestMethod("GET");
            // 设置超时响应时间为5s
            conn.setConnectTimeout(5 * 1000);
            // 通过输入流获取图片资源
            InputStream is = conn.getInputStream();
            // 得到图片的二进制数据,以二进制封装得到数据
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            // 创建一个Buffer字符串
            byte[] buffer = new byte[1024];
            // 每次读取的字符串长度,如果为-1,代表全部读取完毕
            int len = 0;
            // 使用一个输入流从buffer里把数据读取出来
            while ((len = is.read(buffer)) != -1) {
            // 用输出流往buffer里写入数据,中间参数代表从哪个位置开始读,len代表读取的长度
                os.write(buffer, 0, len);
            }
            // 关闭输入流
            is.close();
            byte[] data = os.toByteArray();
            // 对字节数组Base64编码
            BASE64Encoder encoder = new BASE64Encoder();
            return encoder.encode(data);
        } catch (Exception e) {
            Logger.err(ImageUtil.class, "encodeImageToBase64 err.", e);
        }
        return null;
    }
}

测试

 public static void main(String[] args) {
    System.out.println(encodeImageToBase64("https://upload.jianshu.io/users/upload_avatars/14814543/caf376b7-107d-49e2-b1b5-a052fc23f181.png?imageMogr2/auto-orient/strip|imageView2/1/w/240/h/240"));
    }

输出:

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HBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/2wBDAQkJCQwLDBgNDRgyIRwhMjIyMjIy
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G5Tt2p2FEJZZN+5T/k0yz7oR70rEpnuVj+eaYdDHI0YbJq2GVOXUhkxNR7IpJD/6jHu/uFd7GnCc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访问方式

在访问格式:data:image/png;base64, base64后的值

如下:

data:image/png;base64,/9j/4AAQSkZJRgABAQAAAQ ……
image.png

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