java图片分割指定大小
litGrey 人气:01.使用工具:Thumbnails
Thumbnails 是由谷歌提供的图片处理包,目前版本0.4.8。
可以简洁的实现图片的缩放、压缩、旋转、水印、格式转换等操作。
2.引入maven
<dependency> <groupId>net.coobird</groupId> <artifactId>thumbnailator</artifactId> <version>0.4.8</version> </dependency> //最新版本可自查
3.工具类
import org.springframework.web.multipart.MultipartFile; import net.coobird.thumbnailator.Thumbnails; import javax.imageio.ImageIO; import java.awt.image.BufferedImage; import java.io.ByteArrayOutputStream; import java.io.IOException; /** * @Auther: lch * @Date: 2019/3/11 09:58 * @Description: 图片工具类 */ public class ImgUtils { public static byte[] uploadImg(Integer height,Integer width,MultipartFile file) throws Exception{ String fileSuffix=file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf(".")+1); BufferedImage bufferedImageBig = Thumbnails.of(file.getInputStream()) .forceSize(height, width).asBufferedImage(); //大图字节转换 ByteArrayOutputStream outBig = new ByteArrayOutputStream(); try { ImageIO.write(bufferedImageBig, fileSuffix, outBig); } catch (IOException e) { e.printStackTrace(); } return outBig.toByteArray(); } }
4.切割图片返回字节数组
/** * 接收文件 * * * @param model * @return * @throws IOException * @throws IllegalStateException */ @RequestMapping(value = "imageupload") public void imageUpload(MultipartFile file) throws IllegalStateException, IOException { //文件名称 String realFileName = file.getOriginalFilename(); //文件后缀 String suffix = realFileName.substring(realFileName.lastIndexOf(".") + 1); /***************文件处理*********************/ try { //大图图片切割 --宽高 720 - 720 byte[] bytesBig = ImgUtils.uploadImg(720, 720, file); //中图图片切割 --宽高 200 - 200 byte[] bytesMiddle = ImgUtils.uploadImg(200, 200, file); //小图图片切割 --宽高 50- 50 byte[] bytesSmall = ImgUtils.uploadImg(50, 50, file); /************以上三种byte数组,即为切割后的文件******************/ } catch (Exception e) { System.out.println("错误"); } }
小编再为大家补充一段相关代码:java图片切割圆形
@Test public void test() { try { // 读取图片 BufferedImage bi1 = ImageIO.read(new File("g:/free-sheet-share.jpg")); BufferedImage bi2 = new BufferedImage(bi1.getWidth(), bi1.getHeight(), BufferedImage.TYPE_INT_RGB); Ellipse2D.Double shape = new Ellipse2D.Double(0, 0, bi1.getWidth(), bi1 .getHeight()); Graphics2D g2 = bi2.createGraphics(); g2.setBackground(Color.WHITE); g2.fill(new Rectangle(bi2.getWidth(), bi2.getHeight())); g2.setClip(shape); //设置抗锯齿 g2.drawImage(bi1, 0, 0, null); g2.dispose(); ImageIO.write(bi2, "jpg", new File("e:/2.jpg")); } catch (IOException e) { e.printStackTrace(); } }
加载全部内容