java 实现图片圆角处理、背景透明化

目录

• java 图片圆角处理、背景透明化
• java 的图片处理解析

java 图片圆角处理、背景透明化

/**图片圆角处理，背景透明化
     * @param srcImageFile 原图片
     * @param result  处理后图片
     * @param type   图片格式
     * @param cornerRadius  720为圆角
     */
    public  void makeRoundedCorner(File srcImageFile, File result, String type, int cornerRadius) {
        try {
            BufferedImage bi1 = ImageIO.read(srcImageFile);

            // 根据需要是否使用 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 设置抗锯齿
            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 的图片处理解析

直接上效果图，现在有的需求就是把用户的头像，跟昵称嵌入到这个背景图中。

第一步，把头像切成圆角，背景透明的图片。

第二部，把第一步生成的图片，当成水印放到坐标的左边的红箭头的地方

第三部，创建文字水印，然后放入到右边的红箭头地方。

效果图如下：

由于需要thumbnailator组件支持

先导入maven

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

直接上代码：

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 {
//首先获取
makeRoundedCorner("C:/Users/luojie/Desktop/0.jpg", "C:/Users/luojie/Desktop/2.png", "png", 170);
//后续水印在背景图片的的x轴y轴的坐标
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);
}
};
//把生成的圆形图片变换成宽高142x142的图片
Thumbnails.of("C:/Users/luojie/Desktop/2.png").size(142, 142).toFile(
"C:/Users/luojie/Desktop/2_142x142.png");
//把生成的圆形图片，当水印贴到背景图中，ab为圆形图片应该到背景图的x轴y轴的坐标
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");
//给文字水印
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_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();
        }
    }      

    /**
     * 计算文字像素长度
     * @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;
    }
/*
* 圆角处理
* @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();
       //这里绘画圆角矩形
//        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
//        g2.fillRoundRect(0, 0,w, h, cornerRadius, cornerRadius);
//        g2.setComposite(AlphaComposite.SrcIn);

       //这里绘画原型图
       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;
}
}

以上为个人经验，希望能给大家一个参考，也希望大家多多支持我们。