基础知识 java 图片与string相互转换

﹏ヽ暗。殇╰゛Y 2022-06-07 01:36 214阅读 0赞

import sun.misc.BASE64Decoder;
    
    import java.awt.*;
    import java.awt.image.BufferedImage;
    import java.awt.image.RenderedImage;
    import java.io.*;
    import java.nio.charset.StandardCharsets;
    import java.nio.file.Files;
    import java.nio.file.Paths;
    import java.util.Base64;
    import javax.imageio.ImageIO;
    import javax.swing.*;
    
    public class Main {
    
        public static void main(String[] args) throws IOException{
    
            BufferedImage image_buffer = ImageIO.read(new File("D:\\1.jpg"));
            String string_image=imgToBase64String(image_buffer);
    
    
            FileWriter fi = new FileWriter("D:\\1.txt");
            fi.write(string_image);
            fi.close();
    
            String content = new String(Files.readAllBytes(Paths.get("D:\\1.txt")));
            BufferedImage new_image_buffer=base64StringToImg(content);
            draw_image(new_image_buffer);
    
    
        }
    
    
        //把图片转换成string类型
        public static String imgToBase64String(final RenderedImage img) {
            final ByteArrayOutputStream os = new ByteArrayOutputStream();
            try {
                ImageIO.write(img, "jpg", Base64.getEncoder().wrap(os));
                return os.toString(StandardCharsets.ISO_8859_1.name());
            } catch (final IOException ioe) {
                throw new UncheckedIOException(ioe);
            }
        }
        //把string类型转换成图片
        public static BufferedImage base64StringToImg(final String base64String) {
            try {
                BASE64Decoder decoder = new BASE64Decoder();
                byte[] bytes = decoder.decodeBuffer(base64String);
                ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
                return ImageIO.read(bais);
            } catch (final IOException ioe) {
                throw new UncheckedIOException(ioe);
            }
        }
    
    
    
    
    
    
    
        //绘制图片
        public static  void draw_image(BufferedImage image_buffer) throws IOException {
            ImageIcon icon = new ImageIcon(image_buffer);
            JFrame frame = new JFrame();
            frame.setLayout(new FlowLayout());
    
    
            frame.setSize(image_buffer.getWidth(), image_buffer.getHeight());
            JLabel lbl = new JLabel();
            lbl.setIcon(icon);
            frame.add(lbl);
            frame.setVisible(true);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
        }
    
    
    
    
    }