/**圖片圓角處理，背景透明化
     * @param srcImageFile 原圖片
     * @param result  處理后圖片
     * @param type   圖片格式
     * @param cornerRadius  720為圓角
     */
    public  void makeRoundedCorner(File srcImageFile, File result, String type, int cornerRadius) {        
        try {
            BufferedImage bi1 = ImageIO.read(srcImageFile);
            
            // 根據(jù)需要是否使用 BufferedImage.TYPE_INT_ARGB
            BufferedImage image = new BufferedImage(bi1.getWidth(), bi1.getHeight(),
                    BufferedImage.TYPE_INT_ARGB);
      
            Ellipse2D.Double shape = new Ellipse2D.Double(0, 0, bi1.getWidth(), bi1
                    .getHeight());
             
            Graphics2D g2 = image.createGraphics();
            image = g2.getDeviceConfiguration().createCompatibleImage(bi1.getWidth(), bi1.getHeight(), Transparency.TRANSLUCENT);
            g2 = image.createGraphics();
            g2.setComposite(AlphaComposite.Clear);
            g2.fill(new Rectangle(image.getWidth(), image.getHeight()));
            g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, 1.0f));
            g2.setClip(shape);
            // 使用 setRenderingHint 設(shè)置抗鋸齒
            g2 = image.createGraphics();
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2.fillRoundRect(0, 0,bi1.getWidth(), bi1.getHeight(), cornerRadius, cornerRadius);
            g2.setComposite(AlphaComposite.SrcIn);
            g2.drawImage(bi1, 0, 0, bi1.getWidth(), bi1.getHeight(), null);
            g2.dispose();
            ImageIO.write(image, type, result);
        } catch (Exception e) {
            // TODO: handle exception
        }
    }

java 的圖片處理解析

直接上效果圖，現(xiàn)在有的需求就是把用戶的頭像，跟昵稱嵌入到這個(gè)背景圖中。

第一步，把頭像切成圓角，背景透明的圖片。

第二部，把第一步生成的圖片，當(dāng)成水印放到坐標(biāo)的左邊的紅箭頭的地方

第三部，創(chuàng)建文字水印，然后放入到右邊的紅箭頭地方。

效果圖如下：

由于需要thumbnailator組件支持

先導(dǎo)入maven

<dependency>
    <groupId>net.coobird</groupId>
    <artifactId>thumbnailator</artifactId>
    <version>0.4.8</version>
</dependency>

直接上代碼：

package com.image;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.Transparency;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.geometry.Position;
public class ImageDo {
public static void main(String[] args) throws IOException {
//首先獲取
makeRoundedCorner("C:/Users/luojie/Desktop/0.jpg", "C:/Users/luojie/Desktop/2.png", "png", 170);
//后續(xù)水印在背景圖片的的x軸y軸的坐標(biāo)
Position ab=  new Position() {
@Override
public Point calculate(int enclosingWidth, int enclosingHeight, int width, int height, int insetLeft,
int insetRight, int insetTop, int insetBottom) {
// TODO Auto-generated method stub
return new Point(89, 53);
}
};
//把生成的圓形圖片變換成寬高142x142的圖片
Thumbnails.of("C:/Users/luojie/Desktop/2.png").size(142, 142).toFile(
"C:/Users/luojie/Desktop/2_142x142.png");
//把生成的圓形圖片，當(dāng)水印貼到背景圖中，ab為圓形圖片應(yīng)該到背景圖的x軸y軸的坐標(biāo)        
Thumbnails.of("C:/Users/luojie/Desktop/cmbg.png").size(1280, 1024).watermark(ab,
ImageIO.read(new File("C:/Users/luojie/Desktop/2_142x142.png")), 1f)
.outputQuality(0.8f).toFile("C:/Users/luojie/Desktop/image_watermark_bottom_right.jpg");
//給文字水印
pressText("C:/Users/luojie/Desktop/image_watermark_bottom_right.jpg", "WEIXINYONGHU", "Comic Sans MS", Font.BOLD, 30, Color.BLACK,275, 65, 1f);  
}
    /**  
     * 添加文字水印  
     * @param targetImg 目標(biāo)圖片路徑，如：C://myPictrue//1.jpg  
     * @param pressText 水印文字， 如：中國證券網(wǎng)  
     * @param fontName 字體名稱，    如：宋體  
     * @param fontStyle 字體樣式，如：粗體和斜體(Font.BOLD|Font.ITALIC)  
     * @param fontSize 字體大小，單位為像素  
     * @param color 字體顏色  
     * @param x 水印文字距離目標(biāo)圖片左側(cè)的偏移量，如果x<0, 則在正中間  
     * @param y 水印文字距離目標(biāo)圖片上側(cè)的偏移量，如果y<0, 則在正中間  
     * @param alpha 透明度(0.0 -- 1.0, 0.0為完全透明，1.0為完全不透明)  
     */  
    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_wi = fontSize*getTextLength(pressText);  
            int height_wi = fontSize;                
            int widthDiff = width-width_wi;  
            int heightDiff = height-height_wi;  
            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_wi);//水印文件  
            g.dispose();  
            ImageIO.write(bufferedImage, "JPEG", file);  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
    }      
    
    /** 
     * 計(jì)算文字像素長度 
     * @param text 
     * @return 
     */  
    private static int getTextLength(String text){  
        int textLength = text.length();  
        int length = textLength;  
        for (int i = 0; i < textLength; i++) {  
            int wordLength = String.valueOf(text.charAt(i)).getBytes().length;  
            if(wordLength > 1){  
                length+=(wordLength-1);  
            }  
        }            
        return length%2==0 ? length/2:length/2+1;  
    }  
/*
* 圓角處理
* @param BufferedImage
* @param cornerRadius
* */
public static String makeRoundedCorner(String srcImageFile, String result, String type, int cornerRadius) {
   try {
       BufferedImage image = ImageIO.read(new File(srcImageFile));
//        int w = image.getWidth();
//        int h = image.getHeight();
       int w = image.getWidth();
       int h = image.getHeight();
       BufferedImage output = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
       Graphics2D g2 = output.createGraphics();
       
       output = g2.getDeviceConfiguration().createCompatibleImage(w, h, Transparency.TRANSLUCENT);
       g2.dispose();
       g2 = output.createGraphics();
       //這里繪畫圓角矩形
//        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
//        g2.fillRoundRect(0, 0,w, h, cornerRadius, cornerRadius);
//        g2.setComposite(AlphaComposite.SrcIn);
       
       //這里繪畫原型圖
       Ellipse2D.Double shape = new Ellipse2D.Double(0, 0,w, h); 
       g2.setClip(shape);  
       
       g2.drawImage(image, 0, 0, w, h, null);
       g2.dispose();
       ImageIO.write(output, type, new File(result));
       return result;
   } catch (IOException e) {
       e.printStackTrace();
   }
   return null;
}
}

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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