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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AQIDAAQRBRIhMUEGEyJRYRQycQdCgSNSkbHBFTNDchYkJWJjoeHw/8QAGQEAAgMBAAAAAAAAAAAA
AAAAAAECAwQF/8QAIhEAAgICAwADAQEBAAAAAAAAAAECEQMhBBIxEyJBUUJh/9oADAMBAAIRAxEA
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dRmuLmg3XSOP2nrXbWbiSxSXPKrg1amrKcm0khK6QvIcHA96zTYxfz/TLKuehIqp1fUJJCUi9Kjj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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 ……