package com.common.tool;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.WritableRaster;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
public class ImageUtils {
public static void cutImage(String strSrc, String strDst, Integer intWidth,
Integer intHeight) throws IOException {
File fromFile = new File(strSrc);
BufferedImage srcImage = ImageIO.read(fromFile);
Integer intX = 0;
Integer intY = 0;
if (srcImage.getWidth() - intWidth > 0) {
intX = (srcImage.getWidth() - intWidth) / 2;
}
if (srcImage.getHeight() - intHeight > 0) {
intY = (srcImage.getHeight() - intHeight) / 2;
}
cutImage(strSrc, strDst, intX, intY, intWidth, intHeight);
}
/**
*
* 对图片裁剪，并把裁剪完蛋新图片保存 。
*
*/
public static void cutImage(String strSrc, String strDst, Integer intX,
Integer intY, Integer intWidth, Integer intHeight)
throws IOException {
FileInputStream is = null;
ImageInputStream iis = null;
if (intX == null) {
intX = 0;
}
if (intY == null) {
intY = 0;
}
try {
// 读取图片文件
is = new FileInputStream(strSrc);
/**
* 返回包含所有当前已注册 ImageReader 的 Iterator，这些 ImageReader
* 声称能够解码指定格式。参数：formatName - 包含非正式格式名称 . （例如 "jpeg" 或 "tiff"）等 。
*/
Iterator<ImageReader> it = ImageIO
.getImageReadersByFormatName("jpg");
ImageReader reader = it.next();
// 获取图片流
iis = ImageIO.createImageInputStream(is);
/**
* <p>
* iis:读取源.true:只向前搜索
* </p>
* .将它标记为 ‘只向前搜索’。 此设置意味着包含在输入源中的图像将只按顺序读取，可能允许 reader
* 避免缓存包含与以前已经读取的图像关联的数据的那些输入部分。
*/
reader.setInput(iis, true);
/**
* <p>
* 描述如何对流进行解码的类
* <p>
* .用于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。用于特定图像格式的插件 将从其
* ImageReader 实现的 getDefaultReadParam 方法中返回 ImageReadParam 的实例。
*/
ImageReadParam param = reader.getDefaultReadParam();
/**
* 图片裁剪区域。Rectangle 指定了坐标空间中的一个区域，通过 Rectangle 对象
* 的左上顶点的坐标（x，y）、宽度和高度可以定义这个区域。
*/
Rectangle rect = new Rectangle(intX, intY, intWidth, intHeight);
// 提供一个 BufferedImage，将其用作解码像素数据的目标。
param.setSourceRegion(rect);
/**
* 使用所提供的 ImageReadParam 读取通过索引 imageIndex 指定的对象，并将 它作为一个完整的
* BufferedImage 返回。
*/
BufferedImage bi = reader.read(0, param);
// 保存新图片
ImageIO.write(bi, "jpg", new File(strDst));
} finally {
if (is != null)
is.close();
if (iis != null)
iis.close();
}
}
public static void main(String[] args) throws Exception {
// String strSrc = "e:/index/head07.jpg";
// String strDst = "e:/index/head08.jpg";
// String strDst1 = "e:/index/head09.jpg";
// saveImageAsJpg(strSrc, strDst, 200, 100);
// setImage(strSrc, 200, 100);
}
public static BufferedImage resize(BufferedImage source, int targetW,
int targetH) {
// targetW，targetH分别表示目标长和宽
int type = source.getType();
BufferedImage target = null;
double sx = (double) targetW / source.getWidth();
double sy = (double) targetH / source.getHeight();
// 这里想实现在targetW，targetH范围内实现等比缩放。如果不需要等比缩放
// 则将下面的if else语句注释即可
if (sx < sy) {
sx = sy;
targetW = (int) (sx * source.getWidth());
} else {
sy = sx;
targetH = (int) (sy * source.getHeight());
}
if (type == BufferedImage.TYPE_CUSTOM) { // handmade
ColorModel cm = source.getColorModel();
WritableRaster raster = cm.createCompatibleWritableRaster(targetW,
targetH);
boolean alphaPremultiplied = cm.isAlphaPremultiplied();
target = new BufferedImage(cm, raster, alphaPremultiplied, null);
} else
target = new BufferedImage(targetW, targetH, type);
Graphics2D g = target.createGraphics();
g.setRenderingHint(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
g.drawRenderedImage(source, AffineTransform.getScaleInstance(sx, sy));
g.dispose();
return target;
}
public static void saveImageAsJpg(String fromFileStr, String saveToFileStr,
int width, int hight) throws Exception {
BufferedImage srcImage;
String imgType = "JPEG";
if (fromFileStr.toLowerCase().endsWith(".png")) {
imgType = "PNG";
}
File saveFile = new File(saveToFileStr);
File fromFile = new File(fromFileStr);
srcImage = ImageIO.read(fromFile);
if (width > 0 || hight > 0) {
srcImage = resize(srcImage, width, hight);
}
ImageIO.write(srcImage, imgType, saveFile);
}
public static void setImage(String strSrc, Integer intWidth,
Integer intHeight) throws Exception {
saveImageAsJpg(strSrc, strSrc + "temp", intWidth, intHeight);
FileUtils.deleteFile(strSrc);
cutImage(strSrc + "temp", strSrc, intWidth, intHeight);
FileUtils.deleteFile(strSrc + "temp");
// FileUtils.moveFile(strSrc + "temp", strSrc);
}
}