设为首页收藏本站
开启辅助访问

在路上

 找回密码
 立即注册
在路上 › 站点首页 ›学习 › 查看内容

Java上传图片，对图片进行等比例缩放，及局部裁剪的工具类代码

2016-12-20 13:15| 发布者: zhangjf| 查看: 658| 评论: 0

摘要: import java.awt.Container;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.MediaTracker;import java.awt.Rectangle;import java.awt.RenderingHints;import java.aw ...
  1. import java.awt.Container;
  2. import java.awt.Graphics;
  3. import java.awt.Graphics2D;
  4. import java.awt.Image;
  5. import java.awt.MediaTracker;
  6. import java.awt.Rectangle;
  7. import java.awt.RenderingHints;
  8. import java.awt.Toolkit;
  9. import java.awt.image.BufferedImage;
  10. import java.awt.image.CropImageFilter;
  11. import java.awt.image.FilteredImageSource;
  12. import java.awt.image.ImageFilter;
  13. import java.io.BufferedInputStream;
  14. import java.io.BufferedOutputStream;
  15. import java.io.File;
  16. import java.io.FileInputStream;
  17. import java.io.FileOutputStream;
  18. import java.io.IOException;
  19. import java.io.InputStream;
  20. import java.io.OutputStream;
  21. import java.util.UUID;
  23. import javax.imageio.ImageIO;
  26. import com.sun.image.codec.jpeg.JPEGCodec;
  27. import com.sun.image.codec.jpeg.JPEGEncodeParam;
  28. import com.sun.image.codec.jpeg.JPEGImageEncoder;
  30. public class FileUploadUtils {
  32. /**
  33. * 裁剪图片
  34. * @param input
  35. * @param basepath
  36. * @param uid
  37. * @param x
  38. * @param y
  39. * @param width
  40. * @param height
  41. * @return 绝对路径
  42. * @throws IOException
  43. */
  44. public static String cutImg(String input,String basepath,int x,int y,int width,int height) throws IOException{
  45. String path2 = basepath+"/"+ConstantUtils.USERFACETEMPPATH;
  46. String postfix = getPostfix(input);
  47. String dst = path2 +"/"+UUID.randomUUID().toString()+"."+postfix;
  49. createDir(path2);
  50. imgCut(basepath+input,dst,postfix,x,y,width,height);
  52. return dst;
  53. }
  55. /**
  56. * 裁剪图片
  57. * @param input
  58. * @param src
  59. * @param x
  60. * @param y
  61. * @param width
  62. * @param height
  63. * @throws IOException
  64. */
  65. public static void imgCut(String input,String dst,String type,int x,int y,int width,int height) throws IOException
  66. {
  67. BufferedImage fromimg = ImageIO.read(new File(input));
  68. ImageFilter cropFilter = new CropImageFilter(x,y,width,height);
  69. Image img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(fromimg.getSource(), cropFilter));
  70. BufferedImage tag = new BufferedImage(width,height, BufferedImage.TYPE_INT_RGB);
  72. Graphics g = tag.getGraphics();
  73. g.drawImage(img, 0, 0, null); // 绘制小图
  74. g.dispose();
  75. // 输出为文件
  76. // dir = "d:\temp\cut_image_" + i + "_" + j + ".jpg";
  77. File f = new File(dst);
  78. ImageIO.write(tag,type, f);
  80. }
  83. /**
  84. * 上传头像文件
  85. * @param src
  86. * @param basepath
  87. * @param filename
  88. * @return
  89. * @throws Exception
  90. */
  91. public static String uploadImg(File src,String basepath,String filename) throws Exception{
  92. String daypath = DateTools.getYear() + "" + DateTools.getMonth() + "" + DateTools.getMonthWeek();
  94. String temppath = ConstantUtils.BASEUPLOADPATH+"/"+ConstantUtils.ORIGINALIMGPATH+"/" + daypath;
  95. String thumbnailpath = ConstantUtils.BASEUPLOADPATH+"/"+ConstantUtils.THUMBNAILIMGPATH+"/" + daypath;
  97. String postfix = getPostfix(filename);
  98. String uuid = UUID.randomUUID().toString();
  99. String dsttempname = uuid+"."+postfix;
  101. createDir(basepath +"/"+temppath);
  102. createDir (basepath +"/"+ thumbnailpath);
  105. String dstallpath = basepath +"/"+temppath+"/"+dsttempname;
  106. String dstthumbnailpath = basepath +"/"+thumbnailpath+"/"+dsttempname;
  108. copy(src,new File(dstallpath));
  110. //对上传的文件进行 等比例 裁剪。 按照前段要展现的 height width
  111. Thumbnail(dstallpath,dstthumbnailpath,350,300,100);
  113. //返回裁剪后的路径
  115. return thumbnailpath+"/"+dsttempname;
  116. }
  118. /**
  119. * 上传文件
  120. * @param src
  121. * @param dst
  122. * @throws Exception
  123. */
  124. public static void copy(File src, File dst) throws Exception {
  125. try {
  126. InputStream in = null;
  127. OutputStream out = null;
  128. try {
  129. in = new BufferedInputStream(new FileInputStream(src), ConstantUtils.BUFFER_SIZE);
  130. out = new BufferedOutputStream(new FileOutputStream(dst), ConstantUtils.BUFFER_SIZE);
  131. byte[] buffer = new byte[ConstantUtils.BUFFER_SIZE];
  132. while (in.read(buffer) > 0) {
  133. out.write(buffer);
  134. }
  135. } finally {
  136. if (null != in) {
  137. in.close();
  138. }
  139. if (null != out) {
  140. out.close();
  141. }
  142. }
  143. } catch (Exception e) {
  144. e.printStackTrace();
  145. throw e;
  146. }
  147. }
  149. /**
  150. * 得到文件后缀 jpg
  151. * @param fileName
  152. * @return
  153. */
  154. public static String getPostfix(String fileName){
  155. if (fileName.equals(""))
  156. return "";
  157. int pos = fileName.lastIndexOf(".");
  158. if (pos < 0) {
  159. return fileName.substring(fileName.length() - 3).toLowerCase();
  160. } else {
  161. return fileName.substring(pos+1).toLowerCase();
  162. }
  163. }
  165. /**
  166. * 创建目录
  167. * @param filePath
  168. */
  169. public static void createDir(String filePath) {
  170. File myFile = new File(filePath);
  171. if (!myFile.exists()) {
  172. if (!myFile.mkdirs())
  173. System.out.println("创建目录 fail");
  174. else
  175. System.out.println("创建目录 success");
  176. }
  177. myFile = null;
  178. }
  180. /**
  181. * 等比例缩放图片
  182. * @param infile
  183. * @param outfile
  184. * @param width
  185. * @param height
  186. * @param quality
  187. * @throws IOException
  188. * @throws InterruptedException
  189. */
  190. public static void Thumbnail(String infile, String outfile, int width, int height, int quality) throws IOException, InterruptedException {
  191. // save thumbnail image to OUTFILE
  192. //System.out.println("infile:" + infile);
  193. BufferedImage thumbImage = null;
  194. BufferedOutputStream out = null;
  195. Image image = null;
  196. image = Toolkit.getDefaultToolkit().createImage(infile);
  197. MediaTracker mediaTracker = new MediaTracker(new Container());
  198. mediaTracker.addImage(image, 0);
  199. mediaTracker.waitForID(0);
  200. int thumbWidth = width;
  201. int thumbHeight = height;
  202. double thumbRatio = (double) thumbWidth / (double) thumbHeight;
  203. int imageWidth = image.getWidth(null);
  204. int imageHeight = image.getHeight(null);
  205. double imageRatio = (double) imageWidth / (double) imageHeight;
  206. if (thumbRatio < imageRatio) {
  207. thumbHeight = (int) (thumbWidth / imageRatio);
  208. } else {
  209. thumbWidth = (int) (thumbHeight * imageRatio);
  210. }
  211. thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
  212. Graphics2D graphics2D = thumbImage.createGraphics();
  213. graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
  214. graphics2D.drawImage(image,0,0, thumbWidth, thumbHeight, null);
  215. out = new BufferedOutputStream(new FileOutputStream(outfile));
  216. JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
  217. JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbImage);
  218. quality = Math.max(0, Math.min(quality, 100));
  219. param.setQuality((float) quality / 100.0f, false);
  220. encoder.setJPEGEncodeParam(param);
  221. encoder.encode(thumbImage);
  222. out.close();
  223. thumbImage = null;
  224. out = null;
  225. image = null;
  226. }
  227. }
复制代码

收藏 邀请
上一篇：java对PNG图片圆角处理 保持PNG透明背景下一篇：mybatis 并发执行时出现NullPointerException

最新评论

相关分类

小黑屋|在路上 ( 蜀ICP备15035742号-1 )  

;

GMT+8, 2025-7-8 10:41

Copyright 2015-2025 djqfx

返回顶部