package com.example.controller.demo;
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.IOException;
import java.lang.annotation.Target;
import javax.imageio.ImageIO;
/**
* 添加图片水印工具类
*/
public class WaterMarkUtils {
/**
* 获取水印地址
* @return
*/
private static String getWaterMarkPath(){
String path=Thread.currentThread().getContextClassLoader().getResource("watermark/water.png").getPath();
return path;
}
/**
* 图片格式：JPG
*/
private static final String PICTRUE_FORMATE_JPG = "png";
private static final String TARGETIMGPATH = "C:\\Users\\lwz\\Desktop\\temp.png";
// private static final String DISTPATH = "C:\\Users\\lwz\\Desktop\\temp\\temp.png";
private static final String WATERIMGPATH = "C:\\Users\\0\\Desktop\\img\\water.png";
private WaterMarkUtils() {
}
/**
* 添加图片水印
* @param //targetImg 目标图片路径，如：C://myPictrue//1.jpg
* @param //waterImg 水印图片路径，如：C://myPictrue//logo.png
* @param x 水印图片距离目标图片左侧的偏移量，如果x<0, 则在正中间
* @param y 水印图片距离目标图片上侧的偏移量，如果y<0, 则在正中间
* @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明)
*/
public final static void pressImage(String filePath, int x, int y, float alpha) {
String imgType = filePath.substring(filePath.lastIndexOf(".")+1,filePath.length());
try {
File targetFile = new File(filePath);
Image image = ImageIO.read(targetFile);
int width = image.getWidth(null);
int height = image.getHeight(null);
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bufferedImage.createGraphics();
g.drawImage(image, 0, 0, width, height, null);
File file = new File(getWaterMarkPath());
if(file == null){
return;
}
Image waterImage = ImageIO.read(file); // 水印文件
int width_1 = waterImage.getWidth(null);
int height_1 = waterImage.getHeight(null);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
int widthDiff = width - width_1;
int heightDiff = height - height_1;
if(x < 0){
x = widthDiff / 2;
}else if(x > widthDiff){
x = widthDiff;
}
if(y < 0){
y = heightDiff / 2;
}else if(y > heightDiff){
y = heightDiff;
}
g.drawImage(waterImage, x, y, width_1, height_1, null); // 水印文件结束
g.dispose();
ImageIO.write(bufferedImage, imgType, targetFile);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 添加文字水印
*
* @param targetImg 目标图片路径，如：C://myPictrue//1.jpg
* @param pressText 水印文字， 如：中国证券网
* @param fontName 字体名称， 如：宋体
* @param fontStyle 字体样式，如：粗体和斜体(Font.BOLD|Font.ITALIC)
* @param fontSize 字体大小，单位为像素
* @param color 字体颜色
* @param x 水印文字距离目标图片左侧的偏移量，如果x<0, 则在正中间
* @param y 水印文字距离目标图片上侧的偏移量，如果y<0, 则在正中间
* @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明)
*/
public static void pressText(String targetImg, String pressText, String fontName, int fontStyle, int fontSize, Color color, int x, int y, float alpha) {
try {
File file = new File(targetImg);
Image image = ImageIO.read(file);
int width = image.getWidth(null);
int height = image.getHeight(null);
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bufferedImage.createGraphics();
g.drawImage(image, 0, 0, width, height, null);
g.setFont(new Font(fontName, fontStyle, fontSize));
g.setColor(color);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
int width_1 = fontSize * getLength(pressText);
int height_1 = fontSize;
int widthDiff = width - width_1;
int heightDiff = height - height_1;
if (x < 0) {
x = widthDiff / 2;
} else if (x > widthDiff) {
x = widthDiff;
}
if (y < 0) {
y = heightDiff / 2;
} else if (y > heightDiff) {
y = heightDiff;
}
g.drawString(pressText, x, y + height_1);
g.dispose();
ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 获取字符长度，一个汉字作为 1 个字符, 一个英文字母作为 0.5 个字符
*
* @param text
* @return 字符长度，如：text="中国",返回 2；text="test",返回 2；text="中国ABC",返回 4.
*/
public static int getLength(String text) {
int textLength = text.length();
int length = textLength;
for (int i = 0; i < textLength; i++) {
if (String.valueOf(text.charAt(i)).getBytes().length > 1) {
length++;
}
}
return (length % 2 == 0) ? length / 2 : length / 2 + 1;
}
/**
* 图片缩放
*
* @param filePath 图片路径
* @param ratio 指定比例缩放图片
*/
public static void resize(String filePath, Double ratio) {
try {
File file = new File(filePath);
BufferedImage bi = ImageIO.read(file);
int fileWidth = bi.getWidth();
int fileHeight = bi.getHeight();
resize(filePath, (int) (fileWidth * ratio), (int) (fileHeight * ratio), false);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 图片缩放
*
* @param filePath 图片路径
* @param width 指定宽度缩放图片
* @param height 指定高度缩放图片
*/
public static void resize(String filePath, int width, int height) {
resize(filePath, width, height, false);
}
/**
* 图片缩放
*
* @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 width, int height, boolean bb) {
String formatName = filePath.substring(filePath.lastIndexOf(".") + 1, filePath.length());
try {
double ratio = 0d; //缩放比例
File f = new File(filePath);
BufferedImage bi = ImageIO.read(f);
Image imageItem = bi.getScaledInstance(width, height, BufferedImage.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);
imageItem = 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 == imageItem.getWidth(null)) {
g.drawImage(imageItem, 0, (height - imageItem.getHeight(null)) / 2, imageItem.getWidth(null), imageItem.getHeight(null), Color.white, null);
} else {
g.drawImage(imageItem, (width - imageItem.getWidth(null)) / 2, 0, imageItem.getWidth(null), imageItem.getHeight(null), Color.white, null);
}
g.dispose();
imageItem = image;
}
ImageIO.write((BufferedImage) imageItem, formatName, f);
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
try{
String filePath = "";
pressImage(filePath,-1,-1,0.6f);
}catch (Exception ex){
System.out.println(ex.getMessage());
}
pressImage("C://pic//jpg", 5000, 5000, 0f);
pressText("C://pic//jpg", "旺仔之印", "宋体", Font.BOLD|Font.ITALIC, 20, Color.BLACK, 0, 0, 8f);
resize("C://pic//4.jpg", 1000, 500, true);
resize(TARGETIMGPATH, 1366, 736);
}
}
java 编辑图片（压缩文件、加水印）
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