添加水印图片的java代码

添加依赖

     <dependency><groupId>com.github.jai-imageio</groupId><artifactId>jai-imageio-core</artifactId><version>1.4.0</version></dependency>

java代码demo

package com.zkj.report.controller;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;public class WatermarkExample {public static void addWatermark(String inputImagePath) {try {File inputFile = new File(inputImagePath);long totalSpace = inputFile.getTotalSpace();System.out.println(totalSpace);BufferedImage srcImg = ImageIO.read(inputFile);//获取图片的宽int srcImgWidth = srcImg.getWidth(null);//获取图片的高int srcImgHeight = srcImg.getHeight(null);System.out.println("图片的宽:"+srcImgWidth);System.out.println("图片的高:"+srcImgHeight);//创建一个URL对象,获取网络图片的地址信息（网络图片）
//        URL url = new URL("https://pngimg.com/distr/img/ukraine.png");
//        //将URL对象输入流转化为图片对象 (url.openStream()方法，获得一个输入流)
//        Image srcImg = ImageIO.read(url.openStream());
//        //获取图片的宽
//        int srcImgWidth = srcImg.getWidth(null);
//        //获取图片的高
//        int srcImgHeight = srcImg.getHeight(null);
//        System.out.println("图片的宽:"+srcImgWidth);
//        System.out.println("图片的高:"+srcImgHeight);BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);// 加水印//创建画笔Graphics2D g = bufImg.createGraphics();//绘制原始图片g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);//-------------------------文字水印 start----------------------------
//        //根据图片的背景设置水印颜色
//        g.setColor(new Color(255,255,255,128));
//        //设置字体  画笔字体样式为微软雅黑，加粗，文字大小为60pt
//        g.setFont(new Font("微软雅黑", Font.BOLD, 60));
//        String waterMarkContent="图片来源：https://image.baidu.com/";
//        //设置水印的坐标(为原图片中间位置)
//        int x=(srcImgWidth - getWatermarkLength(waterMarkContent, g)) / 2;
//        int y=srcImgHeight / 2;
//        //画出水印 第一个参数是水印内容，第二个参数是x轴坐标，第三个参数是y轴坐标
//        g.drawString(waterMarkContent, x, y);
//        g.dispose();//-------------------------文字水印 end----------------------------//-------------------------图片水印 start----------------------------// 水印文件String waterMarkImage="/Users/candy/Desktop/11.png";Image srcWaterMark = ImageIO.read(new File(waterMarkImage));//获取水印图片的宽度int widthWaterMark= srcWaterMark.getWidth(null);//获取水印图片的高度int heightWaterMark = srcWaterMark.getHeight(null);//设置 alpha 透明度：alpha 必须是范围 [0.0, 1.0] 之内（包含边界值）的一个浮点数字g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.5f));//绘制水印图片  坐标为中间位置g.drawImage(srcWaterMark, (srcImgWidth - widthWaterMark) / 2,(srcImgHeight - heightWaterMark) / 2, widthWaterMark, heightWaterMark, null);// 水印文件结束g.dispose();//-------------------------图片水印 end----------------------------//待存储的地址String tarImgPath="/Users/candy/Desktop/jianxin.jpeg";// 输出图片FileOutputStream outImgStream = new FileOutputStream(tarImgPath);ImageIO.write(bufImg, "png", outImgStream);System.out.println("添加水印完成");outImgStream.flush();outImgStream.close();} catch (IOException e) {e.printStackTrace();}}public static void main(String[] args) {String inputImagePath = "/Users/candy/Desktop/WechatIMG83.jpeg";addWatermark(inputImagePath);}
}