图片压缩、编辑、剪切。什么都不说了，直接上代码：
“` python
package com.smartdoer.utils;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.awt.image.CropImageFilter;
import java.awt.image.FilteredImageSource;
import java.awt.image.ImageFilter;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.web.multipart.MultipartFile;
public class ImgEditor {
/**
* 改变图片尺寸
* @param srcFileName 源图片路径
* @param tagFileName 目的图片路径
* @param width 修改后的宽度
* @param height 修改后的高度
*/
public void zoomImage(String srcFileName,String tagFileName,int width,int height){
try {
BufferedImage bi = ImageIO.read(new File(srcFileName));
BufferedImage tag=new BufferedImage(width,height, BufferedImage.TYPE_INT_RGB);
tag.getGraphics().drawImage(bi, 0, 0, width, height, null);
ImageIO.write(tag, "jpg", new File(tagFileName));//画图
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 缩放图像（按高度和宽度缩放）
* @param srcImageFile 源图像文件地址
* @param result 缩放后的图像地址
* @param height 缩放后的高度
* @param width 缩放后的宽度
* @param bb 比例不对时是否需要补白：true为补白; false为不补白;
*/
public void scale(String srcImageFile, String result, int height, int width, boolean bb) {
try {
double ratio = 0.0; // 缩放比例
File f = new File(srcImageFile);
BufferedImage bi = ImageIO.read(f);
Image itemp = bi.getScaledInstance(width, height, bi.SCALE_SMOOTH);
// 计算比例
if ((bi.getHeight() > height) || (bi.getWidth() > width)) {
if (bi.getHeight() > bi.getWidth()) {
ratio = (new Integer(height)).doubleValue()
/ bi.getHeight();
} else {
ratio = (new Integer(width)).doubleValue() / bi.getWidth();
}
AffineTransformOp op = new AffineTransformOp(AffineTransform
.getScaleInstance(ratio, ratio), null);
itemp = op.filter(bi, null);
}
if (bb) {//补白
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, width, height);
if (width == itemp.getWidth(null))
g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2,
itemp.getWidth(null), itemp.getHeight(null),
Color.white, null);
else
g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0,
itemp.getWidth(null), itemp.getHeight(null),
Color.white, null);
g.dispose();
itemp = image;
}
ImageIO.write((BufferedImage) itemp, "JPEG", new File(result));
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 图像切割(按指定起点坐标和宽高切割)
* @param srcImageFile 源图像地址
* @param result 切片后的图像地址
* @param x 目标切片起点坐标X
* @param y 目标切片起点坐标Y
* @param width 目标切片宽度
* @param height 目标切片高度
*/
public void cut(String srcImageFile, String result,
int x, int y, int width, int height) {
try {
// 读取源图像
BufferedImage bi = ImageIO.read(new File(srcImageFile));
int srcWidth = bi.getHeight(); // 源图宽度
int srcHeight = bi.getWidth(); // 源图高度
if (srcWidth > 0 && srcHeight > 0) {
Image image = bi.getScaledInstance(srcWidth, srcHeight,
Image.SCALE_DEFAULT);
// 四个参数分别为图像起点坐标和宽高
// 即: CropImageFilter(int x,int y,int width,int height)
ImageFilter cropFilter = new CropImageFilter(x, y, width, height);
Image img = Toolkit.getDefaultToolkit().createImage(
new FilteredImageSource(image.getSource(),
cropFilter));
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(img, 0, 0, width, height, null); // 绘制切割后的图
g.dispose();
// 输出为文件
ImageIO.write(tag, "JPEG", new File(result));
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 图片裁剪
* @param srcImageFile 图片裁剪地址
* @param result 图片输出文件夹
* @param destWidth 图片裁剪宽度
* @param destHeight 图片裁剪高度
*/
@SuppressWarnings("rawtypes")
public void cutImage(String srcImageFile, String result,
int x,int y, int destWidth, int destHeight) {
try {
Iterator iterator = ImageIO.getImageReadersByFormatName("JPEG");/*PNG,BMP*/
ImageReader reader = (ImageReader)iterator.next();/*获取图片尺寸*/
InputStream inputStream = new FileInputStream(srcImageFile);
ImageInputStream iis = ImageIO.createImageInputStream(inputStream);
reader.setInput(iis, true);
ImageReadParam param = reader.getDefaultReadParam();
Rectangle rectangle = new Rectangle(x,y, destWidth, destHeight);/*指定截取范围*/
param.setSourceRegion(rectangle);
BufferedImage bi = reader.read(0,param);
ImageIO.write(bi, "JPEG", new File(result));
} catch (Exception e) {
e.printStackTrace();
}
}
//获得文件名字
public String getFileName(MultipartFile file, HttpServletRequest request,HttpSession session){
String FILE_PATH = session.getServletContext().getRealPath("/") + "upload";
String fileName = file.getOriginalFilename();
String[] suffixNameArr = fileName.split("\.");
String suffixName = suffixNameArr[suffixNameArr.length-1];
String userName = SecurityContextHolder.getContext().getAuthentication().getName();
return getTime() + userName+"."+suffixName;
}
//文件上传,返回文件路径
public String uploadFile(MultipartFile file, HttpServletRequest request,HttpSession session) throws IOException {
String FILE_PATH = session.getServletContext().getRealPath("/") + "upload";
String fileName = getFileName(file,request,session);
File tempFile = new File(FILE_PATH, fileName);
if (!tempFile.getParentFile().exists()) {
tempFile.getParentFile().mkdir();
}
if (!tempFile.exists()) {
tempFile.createNewFile();
}
file.transferTo(tempFile); //将上传文件写到服务器上指定的文件。
return FILE_PATH + "\" + tempFile.getName();
}
/* public static File getFile(String fileName) {
return new File(FILE_PATH, fileName);
} */
public String getTime(){
Date date = new Date();
SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");//设置日期格式
String nowTime = df.format(date).toString();
return nowTime;
}
public static void main(String[] args){
ImgEditor id = new ImgEditor();
id.cut("E:\photo\IMG_20161223_722039.jpg", "E:\photo\cated.jpg",0,0, 266, 266);
}
}