package com.test;

import org.junit.Test;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

public class JunitImage {
    @Test
    public void testImage(){
        markImageByText("hello world","D:/1.jpg","D:2.jpg",45,new Color(0,0,0),"JPG");
    }


    /**
     * 給圖片添加水印文字、可設置水印文字的旋轉角度
     * @param logoText 要寫入的文字
     * @param srcImgPath 源圖片路徑
     * @param newImagePath 新圖片路徑
     * @param degree 旋轉角度
     * @param color  字體顏色
     * @param formaName 圖片後綴
     */
    public static void markImageByText(String logoText, String srcImgPath,String newImagePath,Integer degree,Color color,String formaName) {
        InputStream is = null;
        OutputStream os = null;
        try {
            // 1、源圖片
            java.awt.Image srcImg = ImageIO.read(new File(srcImgPath));
            BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);
            // 2、得到畫筆對象
            Graphics2D g = buffImg.createGraphics();
            // 3、設置對線段的鋸齒狀邊緣處理
            g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            g.drawImage(srcImg.getScaledInstance(srcImg.getWidth(null), srcImg.getHeight(null), java.awt.Image.SCALE_SMOOTH), 0, 0, null);
            // 4、設置水印旋轉
            if (null != degree) {
                g.rotate(Math.toRadians(degree),  buffImg.getWidth()/2,buffImg.getHeight() /2);
            }
            // 5、設置水印文字顏色
            g.setColor(color);
            // 6、設置水印文字Font
            g.setFont(new java.awt.Font("宋體", java.awt.Font.BOLD, buffImg.getHeight() /2));
            // 7、設置水印文字透明度
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.15f));
            // 8、第一參數->設置的內容，後面兩個參數->文字在圖片上的坐標位置(x,y)
            g.drawString(logoText,  buffImg.getWidth()/2 , buffImg.getHeight()/2);
            // 9、釋放資源
            g.dispose();
            // 10、生成圖片
            os = new FileOutputStream(newImagePath);
            ImageIO.write(buffImg, formaName, os);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (null != is)
                    is.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            try {
                if (null != os)
                    os.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }


}

JAVA給圖片添加水印