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
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;
}
}
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