Created
May 28, 2018 03:47
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裁剪图片
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| package com.inno.utils; | |
| import sun.misc.BASE64Encoder; | |
| import javax.imageio.ImageIO; | |
| import javax.imageio.ImageReadParam; | |
| import javax.imageio.ImageReader; | |
| import javax.imageio.stream.ImageInputStream; | |
| import java.awt.*; | |
| import java.awt.image.BufferedImage; | |
| import java.io.*; | |
| import java.util.Iterator; | |
| /** | |
| * Created by kenny on 2018/5/26. | |
| */ | |
| public class ImageUtil { | |
| //图片是绝对路径 | |
| public static String getImageBaseStringByFilename(String filename){ | |
| InputStream in = null; | |
| byte[] data = null; | |
| //读取图片字节数组 | |
| try | |
| { | |
| in = new FileInputStream(filename); | |
| 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 void main(String[] args) { | |
| //System.out.println(getFileExt("C:\\Users\\kenny\\Desktop\\image\\4e7e1b81f9604d47a4dc3bd27595e036.jpg")); | |
| try { | |
| cut(114, 236, 329, 236, | |
| "C:\\Users\\kenny\\Desktop\\image\\bd77a966bdf2419aba38c46bca30d2fe.jpg", | |
| "C:\\Users\\kenny\\Desktop\\image\\cuts\\cut_bd77a966bdf2419aba38c46bca30d2fe.jpg"); | |
| } catch (IOException e) { | |
| e.printStackTrace(); | |
| } | |
| } | |
| public static final String TYPE_JPG = "jpg"; | |
| public static final String TYPE_GIF = "gif"; | |
| public static final String TYPE_PNG = "png"; | |
| public static final String TYPE_BMP = "bmp"; | |
| public static final String TYPE_UNKNOWN = "unknown"; | |
| /** | |
| * 根据文件流判断图片类型 | |
| * @param fis | |
| * @return jpg/png/gif/bmp | |
| */ | |
| public static String getPicType(FileInputStream fis) { | |
| //读取文件的前几个字节来判断图片格式 | |
| byte[] b = new byte[4]; | |
| try { | |
| fis.read(b, 0, b.length); | |
| String type = bytesToHexString(b).toUpperCase(); | |
| if (type.contains("FFD8FF")) { | |
| return TYPE_JPG; | |
| } else if (type.contains("89504E47")) { | |
| return TYPE_PNG; | |
| } else if (type.contains("47494638")) { | |
| return TYPE_GIF; | |
| } else if (type.contains("424D")) { | |
| return TYPE_BMP; | |
| }else{ | |
| return TYPE_UNKNOWN; | |
| } | |
| } catch (IOException e) { | |
| e.printStackTrace(); | |
| }finally{ | |
| if(fis != null){ | |
| try { | |
| fis.close(); | |
| } catch (IOException e) { | |
| e.printStackTrace(); | |
| } | |
| } | |
| } | |
| return null; | |
| } | |
| /** | |
| * byte数组转换成16进制字符串 | |
| * @param src | |
| * @return | |
| */ | |
| public static String bytesToHexString(byte[] src){ | |
| StringBuilder stringBuilder = new StringBuilder(); | |
| if (src == null || src.length <= 0) { | |
| return null; | |
| } | |
| for (int i = 0; i < src.length; i++) { | |
| int v = src[i] & 0xFF; | |
| String hv = Integer.toHexString(v); | |
| if (hv.length() < 2) { | |
| stringBuilder.append(0); | |
| } | |
| stringBuilder.append(hv); | |
| } | |
| return stringBuilder.toString(); | |
| } | |
| public static void cut(int x,int y,int width,int height,String srcpath,String subpath) throws IOException {//裁剪方法 | |
| FileInputStream is = null; | |
| ImageInputStream iis = null; | |
| try { | |
| is = new FileInputStream(srcpath); //读取原始图片 | |
| String suffix = getPicType(new FileInputStream(new File(srcpath))); | |
| Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName(suffix); //ImageReader声称能够解码指定格式 | |
| ImageReader reader = it.next(); | |
| iis = ImageIO.createImageInputStream(is); //获取图片流 | |
| reader.setInput(iis, true); //将iis标记为true（只向前搜索）意味着包含在输入源中的图像将只按顺序读取 | |
| ImageReadParam param = reader.getDefaultReadParam(); //指定如何在输入时从 Java Image I/O框架的上下文中的流转换一幅图像或一组图像 | |
| Rectangle rect = new Rectangle(x, y, width, height); //定义空间中的一个区域 | |
| param.setSourceRegion(rect); //提供一个 BufferedImage，将其用作解码像素数据的目标。 | |
| BufferedImage bi = reader.read(0, param); //读取索引imageIndex指定的对象 | |
| File destFile = new File(subpath); | |
| ImageIO.write(bi, suffix, destFile); //保存新图片 | |
| Runtime.getRuntime().exec("chmod 664 "+subpath); | |
| } finally { | |
| if (is != null) | |
| is.close(); | |
| if (iis != null) | |
| iis.close(); | |
| } | |
| } | |
| } |
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