import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.imageio.ImageIO;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
/**
* 图片处理工具
*
*/
public final class ImageUtil {
/**
* 图片水印
* @param pressImg 水印图片
* @param targetImg 目标图片
* @param x 修正值 默认在中间
* @param y 修正值 默认在中间
* @param alpha 透明度
*/
public final static void pressImage(String pressImg, String targetImg, int x, int y, float alpha) {
try {
File img = new File(targetImg);
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);
//水印文件
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);
//水印文件结束
g.dispose();
ImageIO.write((BufferedImage) image, "jpg", img);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 文字水印
* @param pressText 水印文字
* @param targetImg 目标图片
* @param fontName 字体名称
* @param fontStyle 字体样式
* @param color 字体颜色
* @param fontSize 字体大小
* @param x 修正值
* @param y 修正值
* @param alpha 透明度
*/
public static void pressText(String pressText, String targetImg, String fontName, int fontStyle, Color color, int fontSize, int x, int y, float alpha) {
try {
File img = new File(targetImg);
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));
g.drawString(pressText, (width - (getLength(pressText) * fontSize)) / 2 + x, (height - fontSize) / 2 + y);
g.dispose();
ImageIO.write((BufferedImage) image, "jpg", img);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 缩放
* @param filePath 图片路径
* @param height 高度
* @param width 宽度
* @param bb 比例不对时是否需要补白
*/
public static void resize(String filePath, int height, int width, boolean bb) {
try {
double ratio = 0.0; //缩放比例
File f = new File(filePath);
BufferedImage bi = ImageIO.read(f);
Image itemp = bi.getScaledInstance(width, height, Image.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) {
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, "jpg", f);
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws IOException {
pressImage("G:\\imgtest\\sy.jpg", "G:\\imgtest\\test1.jpg", 0, 0, 0.5f);
pressText("我是文字水印", "G:\\imgtest\\test1.jpg", "黑体", 36, Color.white, 80, 0, 0, 0.3f);
resize("G:\\imgtest\\test1.jpg", 500, 500, true);
}
public 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;
}
/**
* 设置图片
* @param src 源图片文件完整路径
* @param dist 目标图片文件完整路径
* @param width 缩放的宽度
* @param height 缩放的高度
*/
public static void setImage(String src,String dist,float width,float height){
try{
File srcfile = new File(src);
if(!srcfile.exists()){
System.out.println("文件不存在");
return;
}
BufferedImage image = ImageIO.read(srcfile);
//获得缩放的比例
double ratio = 1.0;
//判断如果高、宽都不大于设定值，则不处理
if(image.getHeight()>height || image.getWidth()>width){
if(image.getHeight() > image.getWidth()){
ratio = height / image.getHeight();
} else {
ratio = width / image.getWidth();
}
}
//计算新的图面宽度和高度
int newWidth =(int)(image.getWidth()*ratio);
int newHeight =(int)(image.getHeight()*ratio);
BufferedImage bfImage= new BufferedImage(newWidth,newHeight,BufferedImage.TYPE_INT_RGB);
bfImage.getGraphics().drawImage(image.getScaledInstance(newWidth, newHeight,Image.SCALE_SMOOTH),0,0,null);
FileOutputStream os = new FileOutputStream(dist);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
encoder.encode(bfImage);
os.close();
System.out.println("创建缩略图成功");
} catch(Exception e) {
System.out.println("创建缩略图发生异常"+e.getMessage());
}
}
}