1、对图片进行拷贝、加水印和黑白处理

• ImageCopy类

package com.spring.aop;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;

public class ImageCopy {
    private static final Logger logger= LoggerFactory.getLogger(ImageCopy.class);

    public void copyImage() throws IOException {
        logger.info("开始讲图片从D盘复制到E盘...");
        File srcFile=new File("D:/city.jpg");
        File destFile=new File("E:/city1.jpg");
        InputStream in = new FileInputStream(srcFile);
        OutputStream out =new FileOutputStream(destFile);
        byte[] bytes= new byte[(int) srcFile.length()];
        int len;
        while((len=in.read(bytes))!=-1){
            out.write(bytes,0,len);
        }
        in.close();
        out.close();
    }
}

• ImageHandle类

package com.spring.aop;

import cn.hutool.core.util.ImageUtil;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

@Aspect
public class ImageHandler {
    private static final Logger logger= LoggerFactory.getLogger(ImageCopy.class);

//    切点函数，必须为空
    @Pointcut("execution(* com.spring.aop.ImageCopy.copyImage())")
    public  void handleImage(){

    }
    @Before(value="handleImage()")
    public void pressTextOnImage()throws IOException {
        logger.info("开始给图片添加水印...");
        File srcFile=new File("D:/city.jpg");
//        通过字节输入流创建一个BufferImage对象
        InputStream input=new FileInputStream(srcFile);
        BufferedImage srcImg= ImageIO.read(input);
        int width=srcImg.getWidth();
        int height=srcImg.getHeight();
        System.out.println("原图宽:"+width+",原图高："+height);
        File destFile=new File("D:/city1.jpg");
        Color color=new Color(250, 220, 107);
        int size=20;
        Font font =new Font("微软雅黑", Font.BOLD,size);
        String text="Wuyou专用";
       ImageUtil.pressText(srcFile,destFile,text,color,font,(width-text.length()*size)/2,height/2-size,1.0f);

    }
    @AfterReturning("handleImage()")
    public void grayImage(){
        logger.info("开始将图片转化为黑白");
        File srcFile=new File("E:/city1.jpg");
        File destFile=new File("E:/city2.jpg");
        ImageUtil.gray(srcFile,destFile);
    }

}

• ImageCopyApp类

package com.spring.aop;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

public class ImageCopyApp {
   public static void main(String[] args) {
       ApplicationContext context=new ClassPathXmlApplicationContext("spring.xml");
       ImageCopy imageCopy=context.getBean(ImageCopy.class);
       try {
           imageCopy.copyImage();
       } catch (IOException e) {
           e.printStackTrace();
       }
   }
}

• 运行结果

  
  city.jpg

city1.jpg
city2.jpg

2、有趣的二维码

• erweima类

package com.spring.aop;

import cn.hutool.core.io.FileUtil;
import cn.hutool.extra.qrcode.QrCodeUtil;
import cn.hutool.extra.qrcode.QrConfig;

import java.awt.*;

public class erweima {
   public static void main(String[] args) {
       QrConfig config = new QrConfig(300, 300);
// 设置边距，既二维码和背景之间的边距
       config.setMargin(3);
       Color foreColor = new Color(250, 117, 8);
       Color bgColor = new Color(200, 179, 47);

       int foreColorRGB=foreColor.getRGB();
       int bgColorRGB=bgColor.getRGB();
       // 设置前景色，
       config.setForeColor(foreColorRGB);
       // 设置背景色
       config.setBackColor(bgColorRGB);
       config.setImg("d:/jianshu.jpg");
       // 生成二维码到文件，也可以到流
       QrCodeUtil.generate("https://www.jianshu.com/u/15950825da52", config, FileUtil.file("d:/qrcode.jpg"));
   }
}

• 运行结果(运行结果正确与否以能否扫出为准)

  
  qrcode.jpg