工具类-图片工具类ImageUtils.
功能：图片和base64互转，url和base64互转
import lombok.extern.slf4j.Slf4j;import org.springframework.util.Base64Utils;import org.springframework.util.StringUtils;import javax.imageio.ImageIO;import java.awt.image.BufferedImage;import java.io.BufferedInputStream;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import .HttpURLConnection;import .URL;import java.nio.file.Files;import java.nio.file.Paths;import java.nio.file.StandardOpenOption;import java.util.Objects;/*** base64工具类*/@Slf4jpublic class ImageUtils {private static final int BUF_SIZE = 8096;/*** 验证base64是否为图片** @param base64Str* @return*/public static boolean isImageBase64(String base64Str) {try {BufferedImage bufferedImage = ImageIO.read(new ByteArrayInputStream(Base64Utils.decodeFromString(base64Str)));if (Objects.equals(bufferedImage, (Object) null)) {return false;}} catch (IOException var2) {var2.printStackTrace();}return true;}/*** 根据url获取字节数组** @param imgUrl* @return* @throws Exception*/public static byte[] getBytesByUrl(String imgUrl) throws Exception {if (StringUtils.isEmpty(imgUrl)) {return null;}BufferedInputStream bis = null;ByteArrayOutputStream bos = null;HttpURLConnection http;URL url;try {url = new URL(imgUrl);http = (HttpURLConnection) url.openConnection();http.setConnectTimeout(3000);http.connect();bis = new BufferedInputStream(http.getInputStream());bos = new ByteArrayOutputStream();byte[] buf = new byte[BUF_SIZE];int size;while ((size = bis.read(buf)) != -1) {bos.write(buf, 0, size);}http.disconnect();return bos.toByteArray();} finally {if (bis != null) {try {bis.close();} catch (IOException e) {log.error("流关闭失败，原因：" + e.getMessage(), e);}}if (bos != null) {try {bos.close();} catch (IOException e) {log.error("流关闭失败，原因：" + e.getMessage(), e);}}}}/*** 根据url获取base64** @param imgUrl* @return* @throws Exception*/public static String getBase64ByUrl(String imgUrl) throws Exception {if (StringUtils.isEmpty(imgUrl)) {return null;}byte[] bytes = getBytesByUrl(imgUrl);if (bytes == null) {return "";}return Base64Utils.encodeToString(bytes);}/*** 将字节数组写为磁盘文件** @param path* @param bytes*/private void writeBytesToFile(String path, byte[] bytes) {if (bytes != null) {try {Files.write(Paths.get(path), bytes, StandardOpenOption.CREATE);} catch (Exception e) {log.error("写入文件出错了", e);}}}/*** 将base64写为磁盘文件** @param path* @param base64*/public void writeBase64ToFile(String path, String base64) {byte[] bytes = Base64Utils.decodeFromString(base64);writeBytesToFile(path, bytes);}}
