Java图片处理实用技巧-优快云博客

本文链接：https://blog.youkuaiyun.com/qqtbqq/article/details/90034475
java 图片处理，包括图片裁剪（圆形，矩形），图片的缩放，多张图片组合成一张长图（横向，纵向），边框，水印（45度倾斜），写字，插图，实线、虚线，html格式文本转换成图片（需要html2image-0.9.jar，现在上传下载要5分，我就不上传了，地址https://download.youkuaiyun.com/download/u013296643/10115762）等等。
package com.coolsn.modules.tb.imageTools;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Transparency;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;

import gui.ava.html.image.generator.HtmlImageGenerator;

/**
 * 图片处理
 * @author tb
 *
 */
public class ImgTools {
    /**
     * 裁剪图片-优化版本；以图片中心为源点，按照长宽比进行图片裁剪，裁剪圆形
     * @param BufferedImage
     * @param widthToHeight 长宽比例，若是为1则是圆形
     * @return BufferedImage
     * @throws IOException
     */
    public static BufferedImage cutPicArc(BufferedImage bi,float widthToHeight) throws IOException{
		int width=bi.getWidth();
		int height=bi.getHeight();
		
		int dw=0;
		int dh=0;
		if(width/(height*1.0)>widthToHeight){//截长
			dw=Math.round(Math.abs(width-widthToHeight*height));
		}else{//截高
			dh=Math.round(Math.abs(height-(1/widthToHeight)*width));
		}
		
		BufferedImage bi2 = new BufferedImage(width-dw,height-dh,Transparency.TRANSLUCENT);
		Ellipse2D.Double shape = new Ellipse2D.Double(0,0,width-dw,height-dh);
		 
		Graphics2D g2 = bi2.createGraphics();
		g2.setClip(shape);
		// 使用 setRenderingHint 设置抗锯齿
		g2.drawImage(bi,0,0,null);
		g2.dispose();
		return bi2;
    }
    /**
     * 裁剪图片-优化版本；以图片中心为源点，按照长宽比进行图片裁剪，裁剪矩形
     * @param BufferedImage
     * @param widthToHeight 长宽比例，若是为1则是正方形
     * @return BufferedImage
     * @throws IOException
     */
    public static BufferedImage cutPicRect(BufferedImage bi,float widthToHeight) throws IOException{
		int width=bi.getWidth();
		int height=bi.getHeight();
		
		int dw=0;
		int dh=0;
		if(width/(height*1.0)>widthToHeight){//截长
			dw=Math.round(Math.abs(width-widthToHeight*height));
		}else{//截高
			dh=Math.round(Math.abs(height-(1/widthToHeight)*width));
		}
		
		BufferedImage bi2 = new BufferedImage(width-dw,height-dh,Transparency.TRANSLUCENT);
		Graphics2D g2 = bi2.createGraphics();
		// 使用 setRenderingHint 设置抗锯齿
		g2.drawImage(bi,-dw/2,-dh/2,null);
		g2.dispose();
		return bi2;
    }
    /**
     * 缩放图片
     * @param BufferedImage
     * @param scale 比例饿
     * @return BufferedImage
     */
    public static BufferedImage humbnailPic(BufferedImage bi,float scale) throws IOException{
		int width=bi.getWidth();
		int height=bi.getHeight();
		
		BufferedImage bi2 = new BufferedImage(Math.round(width*scale),Math.round(height*scale),Transparency.TRANSLUCENT);

		Graphics2D g2 = bi2.createGraphics();
		// 使用 setRenderingHint 设置抗锯齿
		g2.drawImage(bi, 0, 0, Math.round(width*scale),Math.round(height*scale), 0, 0, width, height, null);
		g2.dispose();
		return bi2;
    }
    /**
     * 缩放图片-按最小长宽进行压缩
     * @param BufferedImage
     * @param scale 比例饿
     * @return BufferedImage
     */
    public static BufferedImage humbnailPicMin(BufferedImage bi,int minWidth,int minHeight) throws IOException{
		int width=bi.getWidth();
		int height=bi.getHeight();
		
		float scale = 0f;
		
		if(minWidth/width>minHeight/height) {//取小比例
			
			scale = 1.0f*minHeight/height;
			
		}else scale = 1.0f*minWidth/width;
		
		BufferedImage bi2 = new BufferedImage(Math.round(width*scale),Math.round(height*scale),Transparency.TRANSLUCENT);

		Graphics2D g2 = bi2.createGraphics();
		// 使用 setRenderingHint 设置抗锯齿
		g2.drawImage(bi, 0, 0, Math.round(width*scale),Math.round(height*scale), 0, 0, width, height, null);
		g2.dispose();
		return bi2;
    }
    /**
     * 多张图片合成为一张图-竖向
     * @param imagePaths 图片路径数组
     * @param width 合成后图片宽度
     * @param widthFixing 是否固宽（固宽即是所有的图片的宽度一致，大于此宽度的等比例压缩，小于的等比例扩大）
     * @return
     */
    public static BufferedImage composeImageVertical(String[] imagePaths,int width) {
    	
    	File[] files = new File[imagePaths.length];
    	
    	for(int index=0; index<files.length; index++) {
    		
    		files[index] = new File(imagePaths[index]);
    		
    	}
    	
    	return composeImageVertical(files, width);
    }
    /**
     * 目录下所有图片合成为一张图-竖向
     * @param imagePaths 图片路径数组
     * @param width 合成后图片宽度
     * @param widthFixing 是否固宽（固宽即是所有的图片的宽度一致，大于此宽度的等比例压缩，小于的等比例扩大）
     * @return
     */
    public static BufferedImage composeImageVertical(String imageDir,int width) {
    	
    	File[] files = new File(imageDir).listFiles();
    	
    	return composeImageVertical(files, width);
    }
    /**
     * 多张图片合成为一张图-竖向
     * @param images
     * @param width 合成后图片宽度
     * @return
     */
    public static BufferedImage composeImageVertical(File[] images,int width) {
    	
    	//计算所有的图片合起来的高度
    	BufferedImage[] bufferedImages = new BufferedImage[images.length];//处理后的图片
    	int height = 0;
    	for(int index=0; index<images.length; index++) {
    		
    		File image = images[index];
    		try {
    			
				BufferedImage bImage  = ImageIO.read(image);
				//按宽度进行原图片等比缩放
				int newWidth = bImage.getWidth();
				float scale = width*1.0f/newWidth;
				bImage = humbnailPic(bImage,scale);
				height +=bImage.getHeight();
				bufferedImages[index] = bImage;
				
			} catch (IOException e) {
				e.printStackTrace();
				continue;
			}
    		
    	}
    	//构建目标图片
    	BufferedImage bi2 = new BufferedImage(width,height,Transparency.TRANSLUCENT);

		Graphics2D g2 = bi2.createGraphics();
		int finishHeight = 0;//已经完成的高，用于定位下一张图片的起始位置
		//将所有图片画于目标图片上
		for(int index=0; index<bufferedImages.length; index++) {
			
			BufferedImage bufferedImage = bufferedImages[index];
			
			g2.drawImage(bufferedImage,0,finishHeight, width, bufferedImage.getHeight(), null);
			
			finishHeight +=bufferedImage.getHeight();
		}
		g2.dispose();
    	return bi2;
    }
    /**
     * 创建绘图对象
     * @param width 宽度
     * @param height 高度
     * @param color 背景颜色
     * @return
     */
    public static BufferedImage createImage(int width,int height,Color color) {
    	
    	BufferedImage bi=new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR);
    	Graphics g=bi.getGraphics();
    	if (color != null) {
        	g.setColor(color);
        	g.fillRect(0, 0, width, height);
		}
    	
    	return bi;
    }
    /**
     * 画边框
     * @param bi
     * @param borderSize 边框宽度
     * @param borderColor 边框颜色
     * @return
     */
    public static BufferedImage drawBorder(BufferedImage bi,float borderSize,Color borderColor) {

    	int width = bi.getWidth();
    	int height = bi.getHeight();
    	Graphics2D g=bi.createGraphics();
    	g.setStroke(new BasicStroke(borderSize));
        g.setColor(borderColor==null?Color.GRAY:borderColor);
    	g.drawLine(0, 0, width, 0);
    	g.drawLine(width-2, 0, width-2, height);
    	g.drawLine(width, height-1, 0,height-1);
    	g.drawLine(0, height, 0, 0);
    	g.dispose();

    	return bi;
    }
    /**
     * 水印
     * @param bi
     * @param str 水印字符串
     * @param color 水印颜色
     * @param size 字体大小
     * @param hDis 高间隔
     * @param yDis 宽间隔
     * @return
     */
    public static BufferedImage watermark(BufferedImage bi,String str,Color color,int size,int hDis,int yDis) {
    	
    	int len = str.length();
    	Graphics2D g = bi.createGraphics();
    	g.translate(0, 0);
    	g.rotate(-Math.PI / 4);
    	g.setColor(color);
    	g.setFont(new Font("Fixedsys", Font.PLAIN, size));
    	for(int py=0; py<=2*bi.getHeight(); py+=hDis) {
    		
    		for(int px=-bi.getWidth()/2; px<=bi.getWidth()/2; px+=len*20+yDis) {

    	    	g.drawString(str, px, py);
    			
    		}
    		
    		
    	}
    	g.dispose();
    	
    	return bi;
    }
    /**
     * 写字
     * @param bi BufferedImage
     * @param text 文本
     * @param color Color.green
     * @param pointX 起点的x坐标
     * @param pointY 起点的y坐标
     * @param size 字体大小
     * @return
     */
    public static BufferedImage drawFont(BufferedImage bi,String text,Color color,int pointX,int pointY,int size){
    	
    	//g.setColor(Color.green);
    	Graphics2D g = bi.createGraphics();
    	g.setColor(color);
    	g.setFont(new Font("Fixedsys", Font.PLAIN, size));
    	g.drawString(text, pointX, pointY);
    	g.dispose();
    	
    	return bi;
    } 
    /**
     * 插入图片
     * @param g Graphics
     * @param image 图片文件file
     * @param pointX 起点x坐标
     * @param pointY 起点y坐标
     * @param width 自定义插入图片的宽度（高度按比例缩放），若是为0则表示原图片的宽高
     * @return
     * @throws IOException
     */
    public static BufferedImage drawImage(BufferedImage bi,File image,int pointX,int pointY,int width) throws IOException{
    	
    	//g.setColor(Color.green);
    	Graphics2D g = bi.createGraphics();
    	BufferedImage bufferedImage = ImageIO.read(image);
    	int sWidth = bufferedImage.getWidth();
    	int sHeight = bufferedImage.getHeight();
    	if (width != 0) {
			//按比例计算图片的高度
			sHeight = Integer.valueOf(String.valueOf(Math.round((width*1.0/sWidth)*sHeight)));
			sWidth = width;
		}
    	
    	g.drawImage(bufferedImage,pointX, pointY,sWidth, sHeight, null);
    	g.dispose();
    	return bi;
    } 
    /**
     * 插入图片
     * @param bi BufferedImage
     * @param BufferedImage 
     * @param pointX 起点x坐标
     * @param pointY 起点y坐标
     * @param width 自定义插入图片的宽度（高度按比例缩放），若是为0则表示原图片的宽高
     * @return
     * @throws IOException
     */
    public static BufferedImage drawImage(BufferedImage bi,BufferedImage bufferedImage,int pointX,int pointY,int width) throws IOException{
    	
    	//g.setColor(Color.green);
    	Graphics2D g = bi.createGraphics();
    	int sWidth = bufferedImage.getWidth();
    	int sHeight = bufferedImage.getHeight();
    	if (width != 0) {
			//按比例计算图片的高度
			sHeight = Integer.valueOf(String.valueOf(Math.round((width*1.0/sWidth)*sHeight)));
			sWidth = width;
		}
    	
    	g.drawImage(bufferedImage,pointX, pointY,sWidth, sHeight, null);
    	g.dispose();
    	return bi;
    }
    /**
     * 画正玄曲线 横向的
     * 注：内嵌了随机颜色生成，故而产生的线是多彩色
     * @param g graphics
     * @param width img'width
     * @param height img'height
     * @param r 周期半径
     * @param f 峰度
     * @return graphics
     */
    public static BufferedImage drawCurve(BufferedImage bi,int x1,int y1,Integer x2,Integer y2,int r,int f){

    	Graphics2D g = bi.createGraphics();
    	
    	int disX = x2-x1;
    	int disY = y2-y1;
    	double yd = y1;
    	for(int j=1;j<=disX;j++){
    		x2=x1+1;
    		if (disY != 0) {
        		yd=disY*1.0/disX*1+y1;
			}
    		
        	y2=(int) Math.round(Math.sin(x2/r)*f+yd); 
        	setRandomColor(g);
        	g.drawLine(x1, y1, x2, y2);
        	x1 = x2;
        	y1 = y2;
    	}
    	g.dispose();	
    	return bi;
    } 
    /**
     * 画正玄曲线 纵向的
     * 注：内嵌了随机颜色生成，故而产生的线是多彩色
     * @param g graphics
     * @param width img'width
     * @param height img'height
     * @param r 周期半径
     * @param f 峰度
     * @return graphics
     */
    public static BufferedImage drawCurveH(BufferedImage bi,int width,int height,int r,int f){

    	Graphics2D g = bi.createGraphics();
		int xD=(int) Math.round(Math.random()*width);
	    int x1=xD;
	    int y1=0;
	    int y2=0;
	    int x2=0;
	    for(int j=0;j<height;j++){
	    	y2=y1+1;
	    	setRandomColor(g);
	    	x2=(int) Math.round(Math.sin(y2/r)*f)+xD;
	    	g.drawLine(x1, y1, x2, y2);
	    	x1=x2;
	    	y1=y2;
	    }
	    
	    g.dispose();
    	return bi;
    } 
    /**
     * 画圆，其实上是画椭圆，如果横半径与纵半径相等则是特殊的椭圆-->圆
     * @param g	graphics
     * @param wR 横半径
     * @param hR 纵半径
     * @param startW 开始角度
     * @param endW 结束角度
     * 注:角度均是0到360
     * @return
     */
    public static BufferedImage drawCirCle(BufferedImage bi,int wR,int hR,int startW,int endW){

    	Graphics2D g = bi.createGraphics();
    	
		setRandomColor(g);
    	g.drawArc(0, 0, wR, hR,startW,endW);
		//画椭圆的，不过感觉是多余的
		//g.drawOval(0, 0, wR, hR);
    	g.dispose();
		return bi;
    }
    /**
     * 自带的画圆很有局限性，该方法可以将圆设置为多彩色
     * 注：内嵌了随机颜色生成，故而产生的线是多彩色
     * @param g graphics
     * @param xDs 圆心的x坐标
     * @param yDs 圆心的y坐标
     * @param r 该圆的半径
     * @return graphics
     */
    public static BufferedImage drawCirCleByMine(BufferedImage bi,int xDs,int yDs,int r){
    	Graphics2D g = bi.createGraphics();
    	int yD=yDs;
    	int xD=xDs-20;
    	int y1=yD;
    	int x1=0;
    	int x2=0;
    	int y2=0;
    	for(int j=0;j<=r*2;j++){
    		x2=x1+1;
    		y2=(int) Math.round(Math.sqrt(r*r-(x2-r)*(x2-r)))+yD;
    		setRandomColor(g);
    		g.drawLine(x1+xD, y1, x2+xD, y2);
    		x1=x2;
    		y1=y2;
    	}
    	x1=0;
    	y1=yD;
    	for(int j=0;j<=r*2;j++){
    		x2=x1+1;
    		y2=yD-(int) Math.round(Math.sqrt(r*r-(x2-r)*(x2-r)));
    		setRandomColor(g);
    		g.drawLine(x1+xD, y1, x2+xD, y2);
    		x1=x2;
    		y1=y2;
    	}
    	
    	g.dispose();
    	
    	return bi;
    }
    /**
     * 设置随机颜色
     * @param g
     * @return
     */
    public static Graphics setRandomColor(Graphics g){
		int red=0;
		int green=0;
		int blue=0;
		Random random=new Random();
    	// 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。         
        red = random.nextInt(255);         
        green = random.nextInt(255);         
        blue = random.nextInt(255);         
        // 用随机产生的颜色将验证码绘制到图像中。         
        g.setColor(new Color(red, green, blue));
    	return g;
    }
    /**
     * html格式文本转换成图片
     * @param htmlStr
     * @return
     */
    public static BufferedImage html2image(String htmlStr) {
    	
    	HtmlImageGenerator imageGenerator = new HtmlImageGenerator();
    	
    	imageGenerator.loadHtml(htmlStr);

    	BufferedImage bufferedImage = imageGenerator.getBufferedImage();
    	
    	return bufferedImage;
    } 
    /**
     * 画线-实线
     * @param bi
     * @param x1 起点x坐标
     * @param y1 起点y坐标
     * @param x2 终点x坐标
     * @param y2 终点y坐标
     * @param color 颜色
     * @param size 粗细
     * @return
     */
    public static BufferedImage drawLine(BufferedImage bi,int x1,int y1, int x2, int y2,Color color,float size) {
    	
    	Graphics2D g = bi.createGraphics();
        g.setColor(color);
    	g.setStroke(new BasicStroke(size));
    	g.drawLine(x1, y1, x2, y2);
    	g.dispose();
    	
    	
    	return bi;
    }
    /**
     * 画线-虚线
     * @param bi
     * @param x1 起点x坐标
     * @param y1 起点y坐标
     * @param x2 终点x坐标
     * @param y2 终点y坐标
     * @param color 颜色
     * @param size 粗细
     * @param lineSize 线段长度
     * @param disSize 间隔长度
     * @return
     */
    public static BufferedImage drawLine(BufferedImage bi,int x1,int y1, int x2, int y2,Color color,float size,int lineLen,int disLen) {
    	
    	Graphics2D g = bi.createGraphics();
        g.setColor(color);
    	g.setStroke(new BasicStroke(size));
    	
    	int lenX = x2-x1;
    	int lenY = y2-y1;
    	
    	if (lenX != 0 && lenY != 0) {//画斜线
    		
        	int disXu = (int) Math.round(Math.sqrt((Math.pow(lenY, 2)*Math.pow(lineLen, 2))/(Math.pow(lenX, 2)+Math.pow(lenY, 2))));//x的步长
        	int disXdu = (int) Math.round(Math.sqrt((Math.pow(lenY, 2)*Math.pow(disLen, 2))/(Math.pow(lenX, 2)+Math.pow(lenY, 2))));//x的间隔步长
        	int disYu = (int) Math.round(lenY*1.0*disXu/lenX);//y的步长
        	int disYdu = (int) Math.round(lenY*1.0*disXdu/lenX);//y的间隔步长
        	if (disXu == 0) {
    			disXu = 1;
    		}
        	if (disXdu == 0) {
				disXdu = 1;
			}

        	for(int disX=0; disX<=lenX; disX+=(disXu+disXdu)) {
        		
        		x2 = x1+disXu;
        		y2 = y1+disYu;
            	g.drawLine(x1, y1, x2, y2);
        		
            	x1 = x2+disXdu;
            	y1 = y2+disYdu;
        	}
        	
		}else {//画横竖线
			
			if (lenX == 0) {//画横线
				
				for(int disY=0; disY<=lenY; disY+=(lineLen+disLen)) {

					y2 = y1+lineLen;
	            	g.drawLine(x1, y1, x2, y2);
					
	            	y1 =y2+disLen;
				}
				
			}else {
				
				for(int disX=0; disX<=lenX; disX+=(lineLen+disLen)) {

					x2 = x1+lineLen;
	            	g.drawLine(x1, y1, x2, y2);
					
	            	x1 =x2+disLen;
				}
				
			}
			
		}
    	g.dispose();
    	
    	
    	return bi;
    }
	/**
	 * @param args
	 * @throws Exception 
	 */
	public static void main(String[] args) throws Exception {
		/*BufferedImage bi=ImageIO.read(new File("F:\\1.jpeg"));
		bi=cutPicRect(bi,1);
		ImageIO.write(bi, "png", new File("F:\\1_1.jpeg"));*/
		
		
		/*BufferedImage bImage = composeImageVertical(new String[] {"F:\\picture\\壁纸\\14ce36d3d539b6004675e6c6ea50352ac65cb70c.jpg",
				"F:\\picture\\壁纸\\138-140F9154532.jpg",
				"F:\\picture\\壁纸\\82240c15ed7bc76f2af9cb0882770dd6.jpg",
				"F:\\picture\\壁纸\\22197937_1371459132142.jpg",
				"F:\\picture\\壁纸\\c0e0b81d5066c275d6f8c954b1202386.jpg"},2000);*/
		//BufferedImage bImage = composeImageVertical("F:\\picture\\壁纸",500);
		//ImageIO.write(bImage, "png", new File("F:\\picture\\壁纸\\compose.jpg"));

    	BufferedImage bi=createImage(450, 630, Color.WHITE);
    	bi = drawFont(bi,"测试", Color.RED, 10, 10, 15);
    	
    	ImageIO.write(bi, "jpg", new File("F:\\picture\\test\\参赛证.jpg"));
	}

}