Java圖檔處理工具類（裁剪、縮放等）

轉自：http://blog.csdn.net/zhangzhikaixinya/article/details/8459400#comments

import java.awt.AlphaComposite;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.Toolkit;

import java.awt.color.ColorSpace;

import java.awt.geom.AffineTransform;

import java.awt.image.AffineTransformOp;

import java.awt.image.BufferedImage;

import java.awt.image.ColorConvertOp;

import java.awt.image.CropImageFilter;

import java.awt.image.FilteredImageSource;

import java.awt.image.ImageFilter;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

public class ImageUtils {

public static String IMAGE_TYPE_GIF = "gif";// 圖形交換格式

public static String IMAGE_TYPE_JPG = "jpg";// 聯合照片專家組

public static String IMAGE_TYPE_JPEG = "jpeg";// 聯合照片專家組

public static String IMAGE_TYPE_BMP = "bmp";// 英文Bitmap（位圖）的簡寫，它是Windows作業系統中的标準圖像檔案格式

public static String IMAGE_TYPE_PNG = "png";// 可移植網絡圖形

public static String IMAGE_TYPE_PSD = "psd";// Photoshop的專用格式Photoshop

public static void main(String[] args) {

// 1-縮放圖像：

// 方法一：按比例縮放

ImageUtils.scale("e:/abc.jpg", "e:/abc_scale.jpg", 2, true);//測試OK

// 方法二：按高度和寬度縮放

ImageUtils.scale2("e:/abc.jpg", "e:/abc_scale2.jpg", 500, 300, true);//測試OK

// 2-切割圖像：

// 方法一：按指定起點坐标和寬高切割

ImageUtils.cut("e:/abc.jpg", "e:/abc_cut.jpg", 0, 0, 400, 400 );//測試OK

// 方法二：指定切片的行數和列數

ImageUtils.cut2("e:/abc.jpg", "e:/", 2, 2 );//測試OK

// 方法三：指定切片的寬度和高度

ImageUtils.cut3("e:/abc.jpg", "e:/", 300, 300 );//測試OK

// 3-圖像類型轉換：

ImageUtils.convert("e:/abc.jpg", "GIF", "e:/abc_convert.gif");//測試OK

// 4-彩色轉黑白：

ImageUtils.gray("e:/abc.jpg", "e:/abc_gray.jpg");//測試OK

// 5-給圖檔添加文字水印：

// 方法一：

ImageUtils.pressText("我是水印文字","e:/abc.jpg","e:/abc_pressText.jpg","宋體",Font.BOLD,Color.white,80, 0, 0, 0.5f);//測試OK

// 方法二：

ImageUtils.pressText2("我也是水印文字", "e:/abc.jpg","e:/abc_pressText2.jpg", "黑體", 36, Color.white, 80, 0, 0, 0.5f);//測試OK

// 6-給圖檔添加圖檔水印：

ImageUtils.pressImage("e:/abc2.jpg", "e:/abc.jpg","e:/abc_pressImage.jpg", 0, 0, 0.5f);//測試OK

}

public final static void scale(String srcImageFile, String result,

int scale, boolean flag) {

try {

BufferedImage src = ImageIO.read(new File(srcImageFile)); // 讀入檔案

int width = src.getWidth(); // 得到源圖寬

int height = src.getHeight(); // 得到源圖長

if (flag) {// 放大

width = width * scale;

height = height * scale;

} else {// 縮小

width = width / scale;

height = height / scale;

}

Image image = src.getScaledInstance(width, height,

Image.SCALE_DEFAULT);

BufferedImage tag = new BufferedImage(width, height,

BufferedImage.TYPE_INT_RGB);

Graphics g = tag.getGraphics();

g.drawImage(image, 0, 0, null); // 繪制縮小後的圖

g.dispose();

ImageIO.write(tag, "JPEG", new File(result));// 輸出到檔案流

} catch (IOException e) {

e.printStackTrace();

}

public final static void scale2(String srcImageFile, String result, int height, int width, boolean bb) {

try {

double ratio = 0.0; // 縮放比例

File f = new File(srcImageFile);

BufferedImage bi = ImageIO.read(f);

Image itemp = bi.getScaledInstance(width, height, bi.SCALE_SMOOTH);

// 計算比例

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) {//補白

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();

}

public final static void cut(String srcImageFile, String result,

int x, int y, int width, int height) {

try {

// 讀取源圖像

BufferedImage bi = ImageIO.read(new File(srcImageFile));

int srcWidth = bi.getHeight(); // 源圖寬度

int srcHeight = bi.getWidth(); // 源圖高度

if (srcWidth > 0 && srcHeight > 0) {

Image image = bi.getScaledInstance(srcWidth, srcHeight,

Image.SCALE_DEFAULT);

// 四個參數分别為圖像起點坐标和寬高

// 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); // 繪制切割後的圖

g.dispose();

// 輸出為檔案

ImageIO.write(tag, "JPEG", new File(result));

}

} catch (Exception e) {

e.printStackTrace();

}

public final static void cut2(String srcImageFile, String descDir,

int rows, int cols) {

try {

if(rows<=0||rows>20) rows = 2; // 切片行數

if(cols<=0||cols>20) cols = 2; // 切片列數

// 讀取源圖像

BufferedImage bi = ImageIO.read(new File(srcImageFile));

int srcWidth = bi.getHeight(); // 源圖寬度

int srcHeight = bi.getWidth(); // 源圖高度

if (srcWidth > 0 && srcHeight > 0) {

Image img;

ImageFilter cropFilter;

Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);

int destWidth = srcWidth; // 每張切片的寬度

int destHeight = srcHeight; // 每張切片的高度

// 計算切片的寬度和高度

if (srcWidth % cols == 0) {

destWidth = srcWidth / cols;

} else {

destWidth = (int) Math.floor(srcWidth / cols) + 1;

}

if (srcHeight % rows == 0) {

destHeight = srcHeight / rows;

} else {

destHeight = (int) Math.floor(srcWidth / rows) + 1;

}

// 循環建立切片

// 改進的想法:是否可用多線程加快切割速度

for (int i = 0; i < rows; i++) {

for (int j = 0; j < cols; j++) {

// 四個參數分别為圖像起點坐标和寬高

// 即: CropImageFilter(int x,int y,int width,int height)

cropFilter = new CropImageFilter(j * destWidth, i * destHeight,

destWidth, destHeight);

img = Toolkit.getDefaultToolkit().createImage(

new FilteredImageSource(image.getSource(),

cropFilter));

BufferedImage tag = new BufferedImage(destWidth,

destHeight, BufferedImage.TYPE_INT_RGB);

Graphics g = tag.getGraphics();

g.drawImage(img, 0, 0, null); // 繪制縮小後的圖

g.dispose();

// 輸出為檔案

ImageIO.write(tag, "JPEG", new File(descDir

+ "_r" + i + "_c" + j + ".jpg"));

}

} catch (Exception e) {

e.printStackTrace();

}

public final static void cut3(String srcImageFile, String descDir,

int destWidth, int destHeight) {

try {

if(destWidth<=0) destWidth = 200; // 切片寬度

if(destHeight<=0) destHeight = 150; // 切片高度

// 讀取源圖像

BufferedImage bi = ImageIO.read(new File(srcImageFile));

int srcWidth = bi.getHeight(); // 源圖寬度

int srcHeight = bi.getWidth(); // 源圖高度

if (srcWidth > destWidth && srcHeight > destHeight) {

Image img;

ImageFilter cropFilter;

Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);

int cols = 0; // 切片橫向數量

int rows = 0; // 切片縱向數量

// 計算切片的橫向和縱向數量

if (srcWidth % destWidth == 0) {

cols = srcWidth / destWidth;

} else {

cols = (int) Math.floor(srcWidth / destWidth) + 1;

}

if (srcHeight % destHeight == 0) {

rows = srcHeight / destHeight;

} else {

rows = (int) Math.floor(srcHeight / destHeight) + 1;

}

// 循環建立切片

// 改進的想法:是否可用多線程加快切割速度

for (int i = 0; i < rows; i++) {

for (int j = 0; j < cols; j++) {

// 四個參數分别為圖像起點坐标和寬高

// 即: CropImageFilter(int x,int y,int width,int height)

cropFilter = new CropImageFilter(j * destWidth, i * destHeight,

destWidth, destHeight);

img = Toolkit.getDefaultToolkit().createImage(

new FilteredImageSource(image.getSource(),

cropFilter));

BufferedImage tag = new BufferedImage(destWidth,

destHeight, BufferedImage.TYPE_INT_RGB);

Graphics g = tag.getGraphics();

g.drawImage(img, 0, 0, null); // 繪制縮小後的圖

g.dispose();

// 輸出為檔案

ImageIO.write(tag, "JPEG", new File(descDir

+ "_r" + i + "_c" + j + ".jpg"));

}

} catch (Exception e) {

e.printStackTrace();

}

public final static void convert(String srcImageFile, String formatName, String destImageFile) {

try {

File f = new File(srcImageFile);

f.canRead();

f.canWrite();

BufferedImage src = ImageIO.read(f);

ImageIO.write(src, formatName, new File(destImageFile));

} catch (Exception e) {

e.printStackTrace();

}

public final static void gray(String srcImageFile, String destImageFile) {

try {

BufferedImage src = ImageIO.read(new File(srcImageFile));

ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);

ColorConvertOp op = new ColorConvertOp(cs, null);

src = op.filter(src, null);

ImageIO.write(src, "JPEG", new File(destImageFile));

} catch (IOException e) {

e.printStackTrace();

}

public final static void pressText(String pressText,

String srcImageFile, String destImageFile, String fontName,

int fontStyle, Color color, int fontSize,int x,

int y, float alpha) {

try {

File img = new File(srcImageFile);

Image src = ImageIO.read(img);

int width = src.getWidth(null);

int height = src.getHeight(null);

BufferedImage image = new BufferedImage(width, height,

BufferedImage.TYPE_INT_RGB);

Graphics2D g = image.createGraphics();

g.drawImage(src, 0, 0, width, height, null);

g.setColor(color);

g.setFont(new Font(fontName, fontStyle, fontSize));

g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,

alpha));

// 在指定坐标繪制水印文字

g.drawString(pressText, (width - (getLength(pressText) * fontSize))

/ 2 + x, (height - fontSize) / 2 + y);

g.dispose();

ImageIO.write((BufferedImage) image, "JPEG", new File(destImageFile));// 輸出到檔案流

} catch (Exception e) {

e.printStackTrace();

}

public final static void pressText2(String pressText, String srcImageFile,String destImageFile,

String fontName, int fontStyle, Color color, int fontSize, int x,

int y, float alpha) {

try {

File img = new File(srcImageFile);

Image src = ImageIO.read(img);

int width = src.getWidth(null);

int height = src.getHeight(null);

BufferedImage image = new BufferedImage(width, height,

BufferedImage.TYPE_INT_RGB);

Graphics2D g = image.createGraphics();

g.drawImage(src, 0, 0, width, height, null);

g.setColor(color);

g.setFont(new Font(fontName, fontStyle, fontSize));

g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,

alpha));

// 在指定坐标繪制水印文字

g.drawString(pressText, (width - (getLength(pressText) * fontSize))

/ 2 + x, (height - fontSize) / 2 + y);

g.dispose();

ImageIO.write((BufferedImage) image, "JPEG", new File(destImageFile));

} catch (Exception e) {

e.printStackTrace();

}

public final static void pressImage(String pressImg, String srcImageFile,String destImageFile,

int x, int y, float alpha) {

try {

File img = new File(srcImageFile);

Image src = ImageIO.read(img);

int wideth = src.getWidth(null);

int height = src.getHeight(null);

BufferedImage image = new BufferedImage(wideth, height,

BufferedImage.TYPE_INT_RGB);

Graphics2D g = image.createGraphics();

g.drawImage(src, 0, 0, wideth, height, null);

// 水印檔案

Image src_biao = ImageIO.read(new File(pressImg));

int wideth_biao = src_biao.getWidth(null);

int height_biao = src_biao.getHeight(null);

g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,

alpha));

g.drawImage(src_biao, (wideth - wideth_biao) / 2,

(height - height_biao) / 2, wideth_biao, height_biao, null);

// 水印檔案結束

g.dispose();

ImageIO.write((BufferedImage) image, "JPEG", new File(destImageFile));

} catch (Exception e) {

e.printStackTrace();

}

public final static int getLength(String text) {

int length = 0;

for (int i = 0; i < text.length(); i++) {

if (new String(text.charAt(i) + "").getBytes().length > 1) {

length += 2;

} else {

length += 1;

}

return length / 2;

}

//下面部落客補充幾個方法

public final static void cutImage(File imageFile, int x, int y, int width, int height) {

try {

// 讀取源圖像

BufferedImage bi = ImageIO.read(imageFile);

int srcWidth = bi.getHeight(); // 源圖寬度

int srcHeight = bi.getWidth(); // 源圖高度

if (srcWidth > 0 && srcHeight > 0) {

// Image image = bi.getScaledInstance(srcWidth, srcHeight,

// Image.SCALE_DEFAULT);

// 四個參數分别為圖像起點坐标和寬高

// 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(bi.getSource(),

cropFilter));

BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics g = tag.getGraphics();

g.drawImage(img, 0, 0, width, height, null); // 繪制切割後的圖

g.dispose();

// 輸出為檔案

ImageIO.write(tag, "JPEG", imageFile);

}

} catch (Exception e) {

e.printStackTrace();

}

public static String getPhotoExt(String fileName){

String extName = "jpg";

if(!StringUtils.isEmpty(fileName)){

extName = fileName.substring(fileName.lastIndexOf(".")+1, fileName.length());

}

return extName.toLowerCase();

}

public static Map<String, Integer> getImageSize(File file) throws IOException {

Map<String, Integer> ret = new HashMap<String, Integer>(2);

BufferedImage sourceImg =ImageIO.read(new FileInputStream(file));

ret.put(IMG_WIDTH, sourceImg.getWidth());

ret.put(IMG_HEIGHT, sourceImg.getHeight());

return ret;

}

最後一個cutImage方法，禁用了縮放，調用cut方法有縮放，圖檔會變形。請參考。

Java圖檔處理工具類（裁剪、縮放等）

繼續閱讀

關于Gradle配置的小結

Java小案例——随機數猜測随機數猜測

nginx location中斜線的位置的重要性

27 Best Free Eclipse Plug-ins for Java Developer to be ProductiveCode Quality PluginsText Editor PluginsDependency ManagementVersion Control Integration PluginsFramework Development Continuous Integration Related PluginsOther Utility Plugins

Java String.format方法的簡單使用

neo4j之cypher使用文檔

GitHub連夜封殺！這份阿裡 10W 字内部 Java 字面試手冊到底有多強？

spark/scala關于【資源檔案】加載方法概述外部檔案加載方案測試資源檔案打包入jar包中小結

mybatis_入門程式Mybatis入門

AOP程式設計_Android優雅權限架構(1)概念基礎，2021金三銀四前言正文大綱正文

Effective Java 8:通用程式設計

OOM三種類型

工廠模式-三種類型

【遞歸】高效率求2的n次幂

win10本地scala和spark安裝安裝scala安裝spark

scala (3) Function 和 Method