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.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
/**
* 圖片工具類
* @author hxw
* @description 圖片壓縮 截取
*
*/
public class ImageHelper {
/**
* 實現圖像的等比縮放
*
* @param source
* @param targetW
* @param targetH
* @return
*/
private static BufferedImage resize(BufferedImage source, int targetW, int targetH) {
// targetW,targetH分別表示目標長和寬
int type = source.getType();
BufferedImage target = null;
double sx = (double) targetW / source.getWidth();
double sy = (double) targetH / source.getHeight();
// 這裏想實現在targetW,targetH範圍內實現等比縮放。如果不需要等比縮放
// 則將下面的if else語句註釋即可
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();
// smoother than exlax:
g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
g.drawRenderedImage(source, AffineTransform.getScaleInstance(sx, sy));
g.dispose();
return target;
}
/**
* 實現圖像的等比縮放和縮放後的截取, 處理成功返回true, 否則返回false
*
* @param inFilePath
* 要截取文件的路徑
* @param outFilePath
* 截取後輸出的路徑
* @param width
* 要截取寬度
* @param hight
* 要截取的高度
* @throws Exception
*/
public static boolean compress(String inFilePath, String outFilePath, int width, int hight) {
boolean ret = false;
File file = new File(inFilePath);
File saveFile = new File(outFilePath);
InputStream in = null;
try {
in = new FileInputStream(file);
ret = compress(in, saveFile, width, hight);
} catch (FileNotFoundException e) {
e.printStackTrace();
ret = false;
} finally {
if (null != in) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return ret;
}
/**
* 實現圖像的等比縮放和縮放後的截取, 處理成功返回true, 否則返回false
*
* @param in
* 要截取文件流
* @param outFilePath
* 截取後輸出的路徑
* @param width
* 要截取寬度
* @param hight
* 要截取的高度
* @throws Exception
*/
public static boolean compress(InputStream in, File saveFile, int width, int hight) {
// boolean ret = false;
BufferedImage srcImage = null;
try {
srcImage = ImageIO.read(in);
} catch (IOException e) {
e.printStackTrace();
return false;
}
if (width > 0 || hight > 0) {
// 原圖的大小
int sw = srcImage.getWidth();
int sh = srcImage.getHeight();
// 如果原圖像的大小小於要縮放的圖像大小,直接將要縮放的圖像複製過去
if (sw > width && sh > hight) {
srcImage = resize(srcImage, width, hight);
} else {
String fileName = saveFile.getName();
String formatName = fileName.substring(fileName.lastIndexOf('.') + 1);
try {
ImageIO.write(srcImage, formatName, saveFile);
} catch (IOException e) {
e.printStackTrace();
return false;
}
return true;
}
}
// 縮放後的圖像的寬和高
int w = srcImage.getWidth();
int h = srcImage.getHeight();
// 如果縮放後的圖像和要求的圖像寬度一樣,就對縮放的圖像的高度進行截取
if (w == width) {
// 計算X軸座標
int x = 0;
int y = h / 2 - hight / 2;
try {
saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile);
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
// 否則如果是縮放後的圖像的高度和要求的圖像高度一樣,就對縮放後的圖像的寬度進行截取
else if (h == hight) {
// 計算X軸座標
int x = w / 2 - width / 2;
int y = 0;
try {
saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile);
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
return true;
}
/**
* 實現圖像的等比縮放和縮放後的截取, 處理成功返回true, 否則返回false
*
* @param in
* 圖片輸入流
* @param saveFile
* 壓縮後的圖片輸出流
* @param proportion
* 壓縮後寬度
* @throws Exception
*/
public static boolean compress(InputStream in, File saveFile, float compress_width) {
if (null == in || null == saveFile || compress_width < 1) {// 檢查參數有效性
// LoggerUtil.error(ImageHelper.class, "--invalid parameter, do
// nothing!");
return false;
}
BufferedImage srcImage = null;
double multiple = 1.0d;
try {
srcImage = ImageIO.read(in);
int original_width = srcImage.getWidth(); // 原始寬度
if (original_width > compress_width) {
multiple = original_width / compress_width; // 計算要達到指定寬度要縮放的倍數
}
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// 原圖的大小
int width = (int) (srcImage.getWidth() / multiple);
int hight = (int) (srcImage.getHeight() / multiple);
srcImage = resize(srcImage, width, hight);
// 縮放後的圖像的寬和高
int w = srcImage.getWidth();
int h = srcImage.getHeight();
// 如果縮放後的圖像和要求的圖像寬度一樣,就對縮放的圖像的高度進行截取
if (w == width) {
// 計算X軸座標
int x = 0;
int y = h / 2 - hight / 2;
try {
saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile);
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
// 否則如果是縮放後的圖像的高度和要求的圖像高度一樣,就對縮放後的圖像的寬度進行截取
else if (h == hight) {
// 計算X軸座標
int x = w / 2 - width / 2;
int y = 0;
try {
saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile);
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
return true;
}
/**
* 實現縮放後的截圖
*
* @param image
* 縮放後的圖像
* @param subImageBounds
* 要截取的子圖的範圍
* @param subImageFile
* 要保存的文件
* @throws IOException
*/
private static void saveSubImage(BufferedImage image, Rectangle subImageBounds, File subImageFile) throws IOException {
if (subImageBounds.x < 0 || subImageBounds.y < 0 || subImageBounds.width - subImageBounds.x > image.getWidth() || subImageBounds.height - subImageBounds.y > image.getHeight()) {
// LoggerUtil.error(ImageHelper.class, "Bad subimage bounds");
return;
}
BufferedImage subImage = image.getSubimage(subImageBounds.x, subImageBounds.y, subImageBounds.width, subImageBounds.height);
String fileName = subImageFile.getName();
String formatName = fileName.substring(fileName.lastIndexOf('.') + 1);
ImageIO.write(subImage, formatName, subImageFile);
}
public static void main(String[] args) throws Exception {
InputStream in = null;
// 縮放後需要保存的路徑
File saveFile = new File("E:/files/3_0.png");
try {
// 原圖片的路徑
in = new FileInputStream(new File("E:/files/gongzhang.png"));
if (compress(in, saveFile, 700)) {
System.out.println("圖片壓縮完成!");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
in.close();
}
}
}
圖片工具類 圖片壓縮 截取 (copy 代碼直接可用)
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