java|java 实现图片圆角处理、背景透明化 java实现图片圆角处理、背景透

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 cornerRadius720为圆角*/publicvoid 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_ARGBBufferedImage 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|java 实现图片圆角处理、背景透明化】
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：

文章图片

由于需要thumbnailator组件支持
先导入maven

net.coobirdthumbnailator0.4.8

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() {@Overridepublic Point calculate(int enclosingWidth, int enclosingHeight, int width, int height, int insetLeft,int insetRight, int insetTop, int insetBottom) {// TODO Auto-generated method stubreturn 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脚本之家。