java 图片圆角处理、背景透明化
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);
}
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();
}
}
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;
}
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编程网。
