后台png转JPG

喜欢ヅ旅行 2023-10-05 14:24 4阅读 0赞

1.插入时

public static void main(String[] args) {
        
            BufferedImage bufferedImage;
    
            // read image file
            try {
        
                bufferedImage = ImageIO.read(new File("C:\\Users\\BS\\Pictures\\Camera Roll\\cs001.png"));
                // create a blank, RGB, same width and height, and a white
                // background
                BufferedImage newBufferedImage = new BufferedImage(
                        bufferedImage.getWidth(), bufferedImage.getHeight(),
                        BufferedImage.TYPE_INT_RGB);
                // TYPE_INT_RGB:创建一个RBG图像，24位深度，成功将32位图转化成24位
                newBufferedImage.createGraphics().drawImage(bufferedImage, 0, 0,
                        Color.WHITE, null);
                // write to jpeg file
                ImageIO.write(newBufferedImage, "jpg", new File("C:\\Users\\BS\\Pictures\\Camera Roll\\cs001.jpg"));
            } catch (IOException e) {
        
                e.printStackTrace();
            }
    
    
        }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MDMwNDY1_size_16_color_FFFFFF_t_70_pic_center]

2.读取时  
2.1 直接读取PNG图片时

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MDMwNDY1_size_16_color_FFFFFF_t_70_pic_center 1]  
2.2转换成JPG读取时

@GetMapping (value = "getI")
    	@ApiOperation(value = "获取图片", notes = "")
    	public void getI(HttpServletRequest request,HttpServletResponse response) throws IOException, ParseException {
        
    	OutputStream os = null;
    	FileInputStream fis = null;
    	try {
        
    		os = response.getOutputStream();
    		fis = new FileInputStream("C:\\Users\\BS\\Pictures\\Camera Roll\\cs001.png");
    
    		BufferedImage bufferedImage;
    		// read image file
    		bufferedImage = ImageIO.read(fis);
    		// create a blank, RGB, same width and height, and a white
    		// background
    		BufferedImage newBufferedImage = new BufferedImage(
    				bufferedImage.getWidth(), bufferedImage.getHeight(),
    				BufferedImage.TYPE_INT_RGB);
    		// TYPE_INT_RGB:创建一个RBG图像，24位深度，成功将32位图转化成24位
    		newBufferedImage.createGraphics().drawImage(bufferedImage, 0, 0,
    				Color.WHITE, null);
    		// write to jpeg file
    		ImageIO.write(newBufferedImage, "jpg", os);
    		System.out.println(response);
    	} catch (IOException e) {
        
    		e.printStackTrace();
    	}
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MDMwNDY1_size_16_color_FFFFFF_t_70_pic_center 2]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MDMwNDY1_size_16_color_FFFFFF_t_70_pic_center]: https://img-blog.csdnimg.cn/20201126110515811.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MDMwNDY1,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MDMwNDY1_size_16_color_FFFFFF_t_70_pic_center 1]: https://img-blog.csdnimg.cn/20201126113708638.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MDMwNDY1,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MDMwNDY1_size_16_color_FFFFFF_t_70_pic_center 2]: https://img-blog.csdnimg.cn/20201126113912471.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MDMwNDY1,size_16,color_FFFFFF,t_70#pic_center