2021-08-19

图片是每一个Java程序员都要面对的，不管审核还是，什么?

下面就有我带大家看看开发中经常解决的图片怎么解决的,希望可以给你带了帮助

1将图片搞成base64位进行解决

@SpringBootTestclass SpringqqApplicationTests {@Testvoid contextLoads() {String path="D:\\.temp\\dd\\1.png";String path1="D:\\.temp\\dd\\img\\";String newName ="2.jpeg";//生成图片的路径String pImagesPath = path1 + newName;String getImageStr = SpringqqApplicationTests.GetImageStr(path);System.out.println(getImageStr);String ff="UklGRvgxAABXRUJQVlA4IOwxAABwrQCdASr0AXcBPpFInkslpKKhpTwYwLASCWVu/Gf5p70HDXo/\n" +"T6l2O/bP9L/D+npev9dwkBzrbPpz3Df/b5869YL5j+7d0X9//1vgf5YPhP7z6E+EfrZ1Du2v0N7d\n" +"/5DvP+bOoL7l9CT7XsQdq/33oC+9n4DzifufMP7X+wB5Sf9rwPvu//F9gP9KfsT7uv+H45frb2D/\n" +"2T9Oj//+6/90f//7xX7mfrTE4GuujXV/xpXIvkuRfJci+S5F8lWlk2uBMZO/ORpIhsXa2GpX\n" +"IvkuRfJci+S5F8lbyZ8GfwlKym7OzsDgPFrpF8lyL5LkXyXIvkuMVKKGJJY812X8jn6ZpYyGfwjX\n" +"5nfBf+yuRfJci+S5F8lyL2sfjEjxhk9maxaf7FYOfa6D6uR359u7iZIbpfehWcSHfGpQwovkuRfJ\n" +"cFOSqhU7gq/+ci12vOHuzv+aAaK0SeQtbURonpf8ixawZzpHm9WMgm5KyLAWcSbcy2iiPlJ5YnA1\n" +"10a6v+NHwf5ZGCyfPgUKPRDR9+HvRAIP7ALvIJ/ohMRDM221R0wPZTtEMa7O+NPDFSCEQwBear73\n" 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+"KLXdy7QvkZANSErweepGg7yEj75L6+mAAAAAAAAAAAA=\n";boolean b = SpringqqApplicationTests.GenerateImage(ff, pImagesPath);System.out.println("是不是成功"+b);}public static   String GetImageStr(String imgFilePath) {byte[] data = null;// 读取图片字节数组try {InputStream in = new FileInputStream(imgFilePath);data = new byte[in.available()];in.read(data);in.close();} catch (IOException e) {e.printStackTrace();}// 对字节数组Base64编码BASE64Encoder encoder = new BASE64Encoder();return encoder.encode(data);// 返回Base64编码过的字节数组字符串}public static  boolean GenerateImage(String imgStr, String imgFilePath) {if (imgStr == null) // 图像数据为空return false;BASE64Decoder decoder = new BASE64Decoder();try {// Base64解码byte[] bytes = decoder.decodeBuffer(imgStr);for (int i = 0; i < bytes.length; ++i) {if (bytes[i] < 0) {// 调整异常数据bytes[i] += 256;}}// 生成jpeg图片OutputStream out = new FileOutputStream(imgFilePath);out.write(bytes);out.flush();out.close();return true;} catch (Exception e) {return false;}}}
文档上传的时候进行
//file为MultipartFile
BASE64Encoder base64Encoder =new BASE64Encoder();
String base64EncoderImg = base64Encoder.encode(file.getBytes());
保存在数据库，面临字符串长度比较长保存不了，
解决方案
https://mp.weixin.qq.com/s?__biz=MzA4MTAwMzA1Mw==&mid=2247484560&idx=1&sn=24176169069bbb4933b7a6da57645a6b&chksm=9f9ad3d2a8ed5ac446e5ab2da149c3ef6fd2300c6057e78eb6ff6a9fe2e06f747808e5f4b2dd&token=1356251448&lang=zh_CN#rd
有人问要图片比较大搞成不了字符串怎么搞
按照比例进行缩放long srcFileSize = srcFile.length();  System.out.println("源图片：" + srcPath + "，大小：" + srcFileSize / 1024  + "kb");  // 1、先转换成jpg  Thumbnails.of(srcPath).scale(1f).toFile(desPath);  //按照比例进行缩放imgScale(desPath, desFileSize, accuracy);File desFile = new File(desPath);  System.out.println("目标图片：" + desPath + "，大小" + desFile.length()  / 1024 + "kb");  System.out.println("图片压缩完成！");  } catch (Exception e) {  e.printStackTrace();  return null;  }  return desPath;  }/*** 按照比例进行缩放 * */private static void imgScale(String desPath, long desFileSize,  double accuracy) throws IOException{File file=new File(desPath);long fileSize=file.length();//判断大小，如果小于指定大小，不压缩；如果大于等于指定大小，压缩if(fileSize<=desFileSize*1024){return;}//按照比例进行缩小Thumbnails.of(desPath).scale(accuracy).toFile(desPath);//按比例缩小System.out.println("按照比例进行缩放");imgScale(desPath, desFileSize, accuracy);}
}
指定大小进行缩放
public class PicUtil {public static void main(String[] args) {  PicUtil.commpressPicForSize("G:\\images\\ceshi.jpg",  "G:\\images\\datas\\ceshi.jpg", 100, 0.3); // 图片小于100kb}  /** * 根据指定大小和指定精度压缩图片 *  * @param srcPath *            源图片地址 * @param desPath *            目标图片地址 * @param desFilesize *            指定图片大小，单位kb * @param accuracy *            精度，递归压缩的比率，建议小于0.9 * @return */  public static String commpressPicForSize(String srcPath, String desPath,  long desFileSize, double accuracy) {  if (StringUtils.isEmpty(srcPath) || StringUtils.isEmpty(srcPath)) {  return null;  }  if (!new File(srcPath).exists()) {  return null;  }  try {  File srcFile = new File(srcPath);  long srcFileSize = srcFile.length();  System.out.println("源图片：" + srcPath + "，大小：" + srcFileSize / 1024  + "kb");  // 1、先转换成jpg  Thumbnails.of(srcPath).scale(1f).toFile(desPath);  // 递归压缩，直到目标文件大小小于desFileSize  commpressPicCycle(desPath, desFileSize, accuracy);File desFile = new File(desPath);  System.out.println("目标图片：" + desPath + "，大小" + desFile.length()  / 1024 + "kb");  System.out.println("图片压缩完成！");  } catch (Exception e) {  e.printStackTrace();  return null;  }  return desPath;  }/*** 图片压缩:按指定大小把图片进行缩放（会遵循原图高宽比例）* 并设置图片文件大小*/private static void commpressPicCycle(String desPath, long desFileSize,  double accuracy) throws IOException {  File srcFileJPG = new File(desPath);  long srcFileSizeJPG = srcFileJPG.length();  // 2、判断大小，如果小于指定大小，不压缩；如果大于等于指定大小，压缩  if (srcFileSizeJPG <= desFileSize * 1024) {return;  }  // 计算宽高  BufferedImage bim = ImageIO.read(srcFileJPG);  int srcWdith = bim.getWidth();  int srcHeigth = bim.getHeight();  int desWidth = new BigDecimal(srcWdith).multiply(  new BigDecimal(accuracy)).intValue();  int desHeight = new BigDecimal(srcHeigth).multiply(  new BigDecimal(accuracy)).intValue();  Thumbnails.of(desPath).size(desWidth, desHeight)  .outputQuality(accuracy).toFile(desPath);  commpressPicCycle(desPath, desFileSize, accuracy);  }
}

/*** 上传文件工类*/
public class FileUploadUtils {/*** 单个上传文件** @param multipartFile      文件* @param filePath           储存文件路径* @param formatFileNameFlag 是否需要格式化文件名称* @return* @throws IOException*/public static String upload(MultipartFile multipartFile, String filePath, boolean formatFileNameFlag) throws IOException {if (multipartFile == null) {throw new RRException("请选择上传文件");}String fileName = multipartFile.getOriginalFilename();if (StrUtil.isBlank(fileName)) {throw new RRException("文件名为空");}File file = new File(filePath);// 文件夹不存在就创建if (!file.exists()) {FileUtil.mkdir(file);}if (formatFileNameFlag) {fileName = formatFileName(fileName);}// 上传文件File uploadFile = new File(file, fileName);multipartFile.transferTo(uploadFile);return fileName;}/*** 批量上传文件** @param multipartFiles     文件列表* @param filePath           储存文件路径* @param formatFileNameFlag 是否需要格式化文件名称* @return* @throws IOException*/public  static String[] upload(MultipartFile[] multipartFiles, String filePath, boolean formatFileNameFlag) throws IOException {if (null == multipartFiles || 0 == multipartFiles.length) {throw new RRException("请选择上传文件");}// 返回值String[] strings = new String[multipartFiles.length];int i = 0;// 循环批量上传for (MultipartFile multipartFile : multipartFiles) {//先查询出重复的 进行删除 再插入图片String upload = upload(multipartFile, filePath, formatFileNameFlag);strings[i++] = upload;}return strings;}/*** 格式化文件名** @param fileName 文件名称* @return*/private static String formatFileName(String fileName) {// 后缀名String suffix = fileName.split("\\.")[1];// 随机数final double d = Math.random();final int i = (int) (d * 1000);// 拼接返回文件名return DatePattern.PURE_DATETIME_MS_FORMAT.format(new Date()) + "" + i + "." + suffix;}/*** 文件删除** @param filePath 文件路径* @return false、true*/public static void delete(String filePath) {if (FileUtil.isFile(filePath)) {FileUtil.del(filePath);}else {throw new RRException("删除的文件为空");}}/*** 删除文件夹下所有文件* @param path  文件夹的路径* @return*/public static void deleteFile(String path) {// get file list where the path hasFile file = new File(path);// get the folder listFile[] array = file.listFiles();for (int i = 0; i < array.length; i++) {if (array[i].isFile()) {delete(array[i].getPath());}}}}
使用这个工具类就可以解决百分的问题

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