java圖片處理功能介紹
java可實現縮放圖像、切割圖像、圖像類型轉換、彩色轉黑白、文字水印、圖片水印等常用功能，本文是百分網小編搜索整理的關于java圖片處理功能介紹，供參考學習，希望對大家有所幫助!想了解更多相關信息請持續關注我們應屆畢業生考試網!
代碼如下 復制代碼
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;
/**
* 圖片處理工具類：<br>
* 功能：縮放圖像、切割圖像、圖像類型轉換、彩色轉黑白、文字水印、圖片水印等
* @author Administrator
*/
public class ImageUtils {
/**
* 幾種常見的圖片格式
*/
public static String IMAGE_TYPE_GIF = "gif";/pic/p>
public static String IMAGE_TYPE_JPG = "jpg";/pic/p>
public static String IMAGE_TYPE_JPEG = "jpeg";/pic/p>
public static String IMAGE_TYPE_BMP = "bmp";/pic/p>
public static String IMAGE_TYPE_PNG = "png";/pic/p>
public static String IMAGE_TYPE_PSD = "psd";/pic/p>
/**
* 程序入口：用于測試
* @param args
*/
public static void main(String[] args) {
/pic/p>
/pic/p>
ImageUtils.scale("e:/abc.jpg", "e:/abc_scale.jpg", 2, true);/pic/p>
/pic/p>
ImageUtils.scale2("e:/abc.jpg", "e:/abc_scale2.jpg", 500, 300, true);/pic/p>
/pic/p>
/pic/p>
ImageUtils.cut("e:/abc.jpg", "e:/abc_cut.jpg", 0, 0, 400, 400 );/pic/p>
/pic/p>
ImageUtils.cut2("e:/abc.jpg", "e:/", 2, 2 );/pic/p>
/pic/p>
ImageUtils.cut3("e:/abc.jpg", "e:/", 300, 300 );/pic/p>
/pic/p>
ImageUtils.convert("e:/abc.jpg", "GIF", "e:/abc_convert.gif");/pic/p>
/pic/p>
ImageUtils.gray("e:/abc.jpg", "e:/abc_gray.jpg");/pic/p>
/pic/p>
/pic/p>
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);/pic/p>
/pic/p>
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);/pic/p>
/pic/p>
ImageUtils.pressImage("e:/abc2.jpg", "e:/abc.jpg","e:/abc_pressImage.jpg", 0, 0, 0.5f);/pic/p>
}
/**
* 縮放圖像（按比例縮放）
* @param srcImageFile 源圖像文件地址
* @param result 縮放后的圖像地址
* @param scale 縮放比例
* @param flag 縮放選擇:true 放大; false 縮小;
*/
public final static void scale(String srcImageFile, String result,
int scale, boolean flag) {
try {
BufferedImage src = ImageIO.read(new File(srcImageFile)); /pic/p>
int width = src.getWidth(); /pic/p>
int height = src.getHeight(); /pic/p>
if (flag) {/pic/p>
width = width * scale;
height = height * scale;
} else {/pic/p>
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); /pic/p>
g.dispose();
ImageIO.write(tag, "JPEG", new File(result));/pic/p>
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 縮放圖像（按高度和寬度縮放）
* @param srcImageFile 源圖像文件地址
* @param result 縮放后的圖像地址
* @param height 縮放后的高度
* @param width 縮放后的寬度
* @param bb 比例不對時是否需要補白：true為補白; false為不補白;
*/
public final static void scale2(String srcImageFile, String result, int height, int width, boolean bb) {
try {
double ratio = 0.0; /pic/p>
File f = new File(srcImageFile);
BufferedImage bi = ImageIO.read(f);
Image itemp = bi.getScaledInstance(width, height, bi.SCALE_SMOOTH);
/pic/p>
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) {/pic/p>
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();
}
}
/**
* 圖像切割(按指定起點坐標和寬高切割)
* @param srcImageFile 源圖像地址
* @param result 切片后的圖像地址
* @param x 目標切片起點坐標X
* @param y 目標切片起點坐標Y
* @param width 目標切片寬度
* @param height 目標切片高度
*/
public final static void cut(String srcImageFile, String result,
int x, int y, int width, int height) {
try {
/pic/p>
BufferedImage bi = ImageIO.read(new File(srcImageFile));
int srcWidth = bi.getHeight(); /pic/p>
int srcHeight = bi.getWidth(); /pic/p>
if (srcWidth > 0 && srcHeight > 0) {
Image image = bi.getScaledInstance(srcWidth, srcHeight,
Image.SCALE_DEFAULT);
/pic/p>
/pic/p>
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); /pic/p>
g.dispose();
/pic/p>
ImageIO.write(tag, "JPEG", new File(result));
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 圖像切割（指定切片的行數和列數）
* @param srcImageFile 源圖像地址
* @param descDir 切片目標文件夾
* @param rows 目標切片行數。默認2，必須是范圍 [1, 20] 之內
* @param cols 目標切片列數。默認2，必須是范圍 [1, 20] 之內
*/
public final static void cut2(String srcImageFile, String descDir,
int rows, int cols) {
try {
if(rows<=0||rows>20) rows = 2; /pic/p>
if(cols<=0||cols>20) cols = 2; /pic/p>
/pic/p>
BufferedImage bi = ImageIO.read(new File(srcImageFile));
int srcWidth = bi.getHeight(); /pic/p>
int srcHeight = bi.getWidth(); /pic/p>
if (srcWidth > 0 && srcHeight > 0) {
Image img;
ImageFilter cropFilter;
Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
int destWidth = srcWidth; /pic/p>
int destHeight = srcHeight; /pic/p>
/pic/p>
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;
}
/pic/p>
/pic/p>
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
/pic/p>
/pic/p>
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); /pic/p>
g.dispose();
/pic/p>
ImageIO.write(tag, "JPEG", new File(descDir
+ "_r" + i + "_c" + j + ".jpg"));
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 圖像切割（指定切片的寬度和高度）
* @param srcImageFile 源圖像地址
* @param descDir 切片目標文件夾
* @param destWidth 目標切片寬度。默認200
* @param destHeight 目標切片高度。默認150
*/
public final static void cut3(String srcImageFile, String descDir,
int destWidth, int destHeight) {
try {
if(destWidth<=0) destWidth = 200; /pic/p>
if(destHeight<=0) destHeight = 150; /pic/p>
/pic/p>
BufferedImage bi = ImageIO.read(new File(srcImageFile));
int srcWidth = bi.getHeight(); /pic/p>
int srcHeight = bi.getWidth(); /pic/p>
if (srcWidth > destWidth && srcHeight > destHeight) {
Image img;
ImageFilter cropFilter;
Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
int cols = 0; /pic/p>
int rows = 0; /pic/p>
/pic/p>
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;
}
/pic/p>
/pic/p>
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
/pic/p>
/pic/p>
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); /pic/p>
g.dispose();
/pic/p>
ImageIO.write(tag, "JPEG", new File(descDir
+ "_r" + i + "_c" + j + ".jpg"));
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 圖像類型轉換：GIF->JPG、GIF->PNG、PNG->JPG、PNG->GIF(X)、BMP->PNG
* @param srcImageFile 源圖像地址
* @param formatName 包含格式非正式名稱的 String：如JPG、JPEG、GIF等
* @param destImageFile 目標圖像地址
*/
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();
}
}
/**
* 彩色轉為黑白
* @param srcImageFile 源圖像地址
* @param destImageFile 目標圖像地址
*/
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();
}
}
/**
* 給圖片添加文字水印
* @param pressText 水印文字
* @param srcImageFile 源圖像地址
* @param destImageFile 目標圖像地址
* @param fontName 水印的字體名稱
* @param fontStyle 水印的字體樣式
* @param color 水印的字體顏色
* @param fontSize 水印的字體大小
* @param x 修正值
* @param y 修正值
* @param alpha 透明度：alpha 必須是范圍 [0.0, 1.0] 之內（包含邊界值）的一個浮點數字
*/
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));
/pic/p>
g.drawString(pressText, (width - (getLength(pressText) * fontSize))
/ 2 + x, (height - fontSize) / 2 + y);
g.dispose();
ImageIO.write((BufferedImage) image, "JPEG", new File(destImageFile));/pic/p>
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 給圖片添加文字水印
* @param pressText 水印文字
* @param srcImageFile 源圖像地址
* @param destImageFile 目標圖像地址
* @param fontName 字體名稱
* @param fontStyle 字體樣式
* @param color 字體顏色
* @param fontSize 字體大小
* @param x 修正值
* @param y 修正值
* @param alpha 透明度：alpha 必須是范圍 [0.0, 1.0] 之內（包含邊界值）的一個浮點數字
*/
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));
/pic/p>
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();
}
}
/**
* 給圖片添加圖片水印
* @param pressImg 水印圖片
* @param srcImageFile 源圖像地址
* @param destImageFile 目標圖像地址
* @param x 修正值。 默認在中間
* @param y 修正值。 默認在中間
* @param alpha 透明度：alpha 必須是范圍 [0.0, 1.0] 之內（包含邊界值）的一個浮點數字
*/
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);
/pic/p>
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);
/pic/p>
g.dispose();
ImageIO.write((BufferedImage) image, "JPEG", new File(destImageFile));
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 計算text的長度（一個中文算兩個字符）
* @param text
* @return
*/
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;
}
}
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