根据传入坐标和图片URL地址对图片进行切图操作、将图片转化成Base64位码

目录

1、根据传入坐标和图片URL地址对图片进行切图操作

2、将图片转化成Base64位编码、根据传入坐标 算出切点坐标

在开发过程的学习记录，此两个工具类主要是对图像的处理（切图），对文件的想换转化，将文件转化成字节数组、Base64位编码等。

1、根据传入坐标和图片URL地址对图片进行切图操作

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.net.HttpURLConnection;
import java.net.URL;
import java.util.Iterator;/*** @program: process* @description: 切图工具类* @author: Huyande* @create: 2019-01-17 14:11**/public class CutImageUtils {/*** 传入坐标和图片URL地址  切图 生成图片到指定的目录* @param x* @param y* @param width* @param height* @param imgUrl* @throws Exception*/public static void cut(int x, int y, int width, int height, String imgUrl) throws Exception{byte[] imgBytes = getUrlFileData(imgUrl);FileInputStream is = byteToFile(imgBytes, "cutPic.jpg");ImageInputStream iis = null ;getUrlFileData(imgUrl);Iterator<ImageReader> it= ImageIO.getImageReadersByFormatName("jpg");ImageReader reader = it.next();iis = ImageIO.createImageInputStream(is);reader.setInput(iis, true) ;ImageReadParam param = reader.getDefaultReadParam();Rectangle rect =  new Rectangle(x, y, width, height);param.setSourceRegion(rect);BufferedImage bi=reader.read(0,param);ImageIO.write(bi, "jpg", new File("E:\\cutPic.jpg"));is.close() ;iis.close();}//获取链接地址文件的byte数据public static byte[] getUrlFileData(String fileUrl) throws Exception{URL url = new URL(fileUrl);HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();httpConn.connect();InputStream cin = httpConn.getInputStream();ByteArrayOutputStream outStream = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;while ((len = cin.read(buffer)) != -1) {outStream.write(buffer, 0, len);}cin.close();byte[] fileData = outStream.toByteArray();outStream.close();return fileData;}/*** byte[] 转 FileInputStream* @param bytes* @param fileName* @return*/public static FileInputStream byteToFile(byte[] bytes, String fileName) {File file = new File(fileName);FileInputStream fileInputStream = null;try {OutputStream output = new FileOutputStream(file);BufferedOutputStream bufferedOutput = new BufferedOutputStream(output);bufferedOutput.write(bytes);fileInputStream = new FileInputStream(file);file.deleteOnExit();return fileInputStream;} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return fileInputStream;}
}

2、将图片转化成Base64位编码、根据传入坐标 算出切点坐标

import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Base64;
import java.util.Base64.Decoder;
import java.util.Base64.Encoder;
import java.util.Iterator;
import java.util.List;
import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;/*** @program: process* @description: 图像操作工具包* @author: Huyande* @create: 2019-01-17 14:21**/public class OperateImageUtils {private Logger log = LoggerFactory.getLogger(getClass());public static final String DEFAULT_IMG_NAME = "tmpImgName";public static final String DEFAULT_IMG_FORMAT = "jpg";public static final String DEFAULT_DATA_URI = "data:application/octet-stream;base64,";private int x;private int y;private int width;private int height;public OperateImageUtils() {}/*** 构造方法* @param x* @param y* @param width* @param height*/public OperateImageUtils(int x, int y, int width, int height) {this.x = x;this.y = y;this.width = width;this.height = height;}/**** 构造方法  传入一个集合坐标值  算出 x，y,width,height* @param bboxes*/public OperateImageUtils(List<List<Integer>> bboxes) {int upLeftX = ((Integer) ((List) bboxes.get(0)).get(0)).intValue();int upLeftY = ((Integer) ((List) bboxes.get(0)).get(1)).intValue();int upRightX = ((Integer) ((List) bboxes.get(1)).get(0)).intValue();int downLeftY = ((Integer) ((List) bboxes.get(3)).get(1)).intValue();int width = Math.abs(upRightX - upLeftX);int height = Math.abs(downLeftY - upLeftY);this.x = upLeftX;this.y = upLeftY;this.width = width;this.height = height;}/**** @param imgBytes* @param suffix* @return*/public byte[] cut(byte[] imgBytes, String suffix) {try {ImageInputStream iis = null;FileInputStream is = byteToFile(imgBytes, "tmpImgName");Iterator it = ImageIO.getImageReadersByFormatName(suffix);ImageReader reader = (ImageReader) it.next();iis = ImageIO.createImageInputStream(is);reader.setInput(iis, true);ImageReadParam param = reader.getDefaultReadParam();Rectangle rect = new Rectangle(this.x, this.y, this.width, this.height);param.setSourceRegion(rect);BufferedImage bi = reader.read(0, param);byte[] cutImg = imageToBytes(bi, "jpg");return cutImg;} catch (IOException e) {this.log.error("image file cut fail, error information is : {} ", e);}return null;}public byte[] imageToBytes(BufferedImage bImage, String format) {ByteArrayOutputStream out = new ByteArrayOutputStream();try {ImageIO.write(bImage, format, out);} catch (IOException e) {e.printStackTrace();}return out.toByteArray();}public int getX() {return this.x;}public void setX(int x) {this.x = x;}public int getY() {return this.y;}public void setY(int y) {this.y = y;}public int getWidth() {return this.width;}public void setWidth(int width) {this.width = width;}public int getHeight() {return this.height;}public void setHeight(int height) {this.height = height;}/*** 	通过文件地址 获取到文件 将文件转化成 byte 数组* @param fileUrl* @return*/public byte[] getUrlFileData(String fileUrl) {try {URL url = new URL(fileUrl);HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();httpConn.connect();InputStream cin = httpConn.getInputStream();ByteArrayOutputStream outStream = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;while ((len = cin.read(buffer)) != -1) {outStream.write(buffer, 0, len);}cin.close();byte[] fileData = outStream.toByteArray();outStream.close();return fileData;} catch (IOException e) {this.log.error("get imageFile by fileUrl fail, error information is : {} ", e);}return null;}/*** 将byte 数组 转化成文件输入流* @param bytes* @param fileName* @return*/public FileInputStream byteToFile(byte[] bytes, String fileName) {File file = new File(fileName);FileInputStream fileInputStream = null;try {OutputStream output = new FileOutputStream(file);BufferedOutputStream bufferedOutput = new BufferedOutputStream(output);bufferedOutput.write(bytes);fileInputStream = new FileInputStream(file);file.deleteOnExit();return fileInputStream;} catch (IOException e) {this.log.error("bytes to Image file fail, error information is : {} ", e);}return fileInputStream;}/*** * @param imageUrl* @param suffix* @return*/public String getBase64Url(String imageUrl, String suffix) {byte[] imgBuffer = null;if (imageUrl.contains("data:application/octet-stream;base64,"))imgBuffer = getBytesByBase64(imageUrl);else {imgBuffer = getUrlFileData(imageUrl);}if ((suffix.isEmpty()) || (null == suffix)) {suffix = "jpg";}byte[] cutImg = cut(imgBuffer, suffix);String result = Base64.getEncoder().encodeToString(cutImg);return "data:application/octet-stream;base64," + result;}public byte[] getBytesByBase64(String base64Uri) {String base64Code = base64Uri.substring(base64Uri.indexOf(",") + 1);byte[] buffer = Base64.getDecoder().decode(base64Code);return buffer;}/*** 	将本地文件转换成字节数组* @param fileUrl* @return*/public byte[] getFileData(String filePath) {try {File file = new File(filePath);InputStream cin =new FileInputStream(file);ByteArrayOutputStream outStream = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;while ((len = cin.read(buffer)) != -1) {outStream.write(buffer, 0, len);}cin.close();byte[] fileData = outStream.toByteArray();outStream.close();return fileData;} catch (IOException e) {this.log.error("get imageFile by fileUrl fail, error information is : {} ", e);}return null;}/*** * @param imageUrl* @param suffix* @return*/public String getBase64Url_Flie(String imageUrl, String suffix) {byte[] imgBuffer = null;imgBuffer = getFileData(imageUrl);if ((suffix.isEmpty()) || (null == suffix)) {suffix = "jpg";}byte[] cutImg = cut(imgBuffer, suffix);String result = Base64.getEncoder().encodeToString(cutImg);return "data:application/octet-stream;base64," + result;}}