从c++获取的图片,返回的格式是abgr的数组,如何用java转为图片

   byte[] src = roiAbgr.getByteArray(0,w * h * 4);
  BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_4BYTE_ABGR);

如何用BufferedImage这个类把src 转为jpg图片

代码如下，望采纳

    /**
     * 获取验证码图片
     * @return  jpg 
     */
    @RequestMapping(value = "/getCodeImage")
    public void getValidateCodeImage(HttpServletRequest request,HttpServletResponse response) throws IOException {

        JSONObject json = new JSONObject();
        PrintWriter out = null;
        out = response.getWriter();
        
        byte[] src = roiAbgr.getByteArray(0,w * h * 4);
        BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_4BYTE_ABGR);
        
        //临时图片路径
        File file = new File("d:\\image\\" + UUID.randomUUID().toString() + ".jpg");
        if(!(file.getParentFile().exists())){  //判断d:\image目录是否存在
            file.getParentFile().mkdir();
        }
        //输出到临时图像
        ImageIO.write(image, "jpg", file);//jpg可以换成你想要的图片格式
        this.file = file;
        json.put("validateCodeImage", file);

        if (null != out) {
            out.close();
        }
    }
    

先把BufferedImage 转为InputStream 流

public InputStream bufferedImageToInputStream(BufferedImage image) throws IOException {
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    ImageIO.write(image, "JPG", os);
    return new ByteArrayInputStream(os.toByteArray());
}

然后将InputStream 流写入到本地文件

 /**
     * 将InputStream写入本地文件
     * @param destination 写入本地目录
     * @param input 输入流
     * @throws IOException IOException
     */
    public static void writeToLocal(String destination, InputStream input)
            throws IOException {
        int index;
        byte[] bytes = new byte[1024];
        FileOutputStream downloadFile = new FileOutputStream(destination);
        while ((index = input.read(bytes)) != -1) {
            downloadFile.write(bytes, 0, index);
            downloadFile.flush();
        }
        input.close();
        downloadFile.close();
 
    }

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.ByteArrayOutputStream;
 
public class ResizeImageExample {
 
    public static void main(String... args) throws IOException {
        File input = new File("ss-2.png");
        BufferedImage image = ImageIO.read(input);
        BufferedImage resized = resizebyaspect(image, 1655, 2340);
        File output = new File("ss-2-resized-500x500.png");
        ImageIO.write(resized, "png", output);
    }
    // 不按比例缩放
    private static BufferedImage resize(BufferedImage img, int height, int width) {
        Image tmp = img.getScaledInstance(width, height, Image.SCALE_SMOOTH);
        BufferedImage resized = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2d = resized.createGraphics();
        g2d.drawImage(tmp, 0, 0, null);
        g2d.dispose();
        return resized;
    }
    // 按比例缩放
    private static BufferedImage resizebyaspect(BufferedImage img, int height, int width) {
        int ori_width = img.getWidth();
        int ori_height = img.getHeight();
        float ratio_w = (float)width/ori_width;
        float ratio_h = (float)height/ori_height;
        int new_width = (ratio_w < ratio_h) ? width : (int)(ratio_h * ori_width);
        int new_height = (ratio_h < ratio_w) ? height : (int)(ratio_w * ori_height);
        System.out.println(new_height);
        System.out.println(new_width);
        Image tmp = img.getScaledInstance(new_width, new_height, Image.SCALE_SMOOTH);
        BufferedImage resized = new BufferedImage(new_width, new_height, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2d = resized.createGraphics();
        g2d.drawImage(tmp, 0, 0, null);
        g2d.dispose();
        return resized;
    }
}

说明：

1. 输入的图片可以是各种格式

2. 输出的图片也可以是各种格式， 不同的格式修改下面的"png",为"jpg"或其他

ImageIO.write(resized, "png", output);

若能解决你的问题，帮忙点击一个采纳，十分感谢

  byte[] src = roiAbgr.getByteArray(0,w * h * 4);
  BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_4BYTE_ABGR); 
  ImageIO.write(image , "jpg", new File("C:/test/result"));  

代码如一楼二楼所示，我就不重复了

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