用java实现base64和图片互转的代码

下面是Java实现Base64和图片互转的代码：

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Base64;

public class ImageBase64Util {

    /**
     * 将图片转换成Base64编码字符串
     *
     * @param imagePath 图片路径
     * @return Base64编码字符串
     */
    public static String imageToBase64(String imagePath) {
        String base64 = null;
        InputStream in = null;
        try {
            in = new FileInputStream(imagePath);
            byte[] bytes = new byte[in.available()];
            in.read(bytes);
            base64 = Base64.getEncoder().encodeToString(bytes);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                in.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return base64;
    }

    /**
     * 将Base64编码字符串转换成图片
     *
     * @param base64    Base64编码字符串
     * @param imagePath 图片保存路径
     * @return 是否保存成功
     */
    public static boolean base64ToImage(String base64, String imagePath) {
        boolean result = false;
        OutputStream out = null;
        try {
            out = new FileOutputStream(imagePath);
            byte[] bytes = Base64.getDecoder().decode(base64);
            out.write(bytes);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                out.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return result;
    }

}

使用示例：

public class ImageBase64UtilTest {

    public static void main(String[] args) {
        // 图片路径
        String imagePath = "D:/test.png";
        // 将图片转换成Base64编码字符串
        String base64 = ImageBase64Util.imageToBase64(imagePath);
        System.out.println(base64);
        // 将Base64编码字符串转换成图片
        String newImagePath = "D:/newtest.png";
        ImageBase64Util.base64ToImage(base64, newImagePath);
    }

}