Java 将图片转base64和base64转图片

news2024/12/23 1:22:14

工具

Base64 和图片互转。

导入的依赖

 <!-- https://mvnrepository.com/artifact/com.sun.xml.bind/jaxb-impl -->
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-impl</artifactId>
            <version>4.0.5</version>
        </dependency>

图片和base64互转

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * base64和图片之间的关系
 */
public class Base64ToImageUtils {

    /**
     * 图片转化成base64字符串
     *
     * @param imgPath
     * @return
     */
    public static String GetImageStr(String imgPath) {// 将图片文件转化为字节数组字符串，并对其进行Base64编码处理
        String imgFile = imgPath;// 待处理的图片
        InputStream in = null;
        byte[] data = null;
        String encode = null; // 返回Base64编码过的字节数组字符串
        // 对字节数组Base64编码
        BASE64Encoder encoder = new BASE64Encoder();
        try {
            // 读取图片字节数组
            in = new FileInputStream(imgFile);
            data = new byte[in.available()];
            in.read(data);
            encode = encoder.encode(data);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                in.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return encode;
    }

    /**
     * base64字符串转化成图片
     *
     * @param imgData     图片编码
     * @param imgFilePath 存放到本地路径
     * @return
     * @throws IOException
     */
    @SuppressWarnings("finally")
    public static boolean GenerateImage(String imgData, String imgFilePath) throws IOException { // 对字节数组字符串进行Base64解码并生成图片
        if (imgData == null) // 图像数据为空
            return false;
        BASE64Decoder decoder = new BASE64Decoder();
        OutputStream out = null;
        try {
            out = new FileOutputStream(imgFilePath);
            // Base64解码
            byte[] b = decoder.decodeBuffer(imgData);
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {// 调整异常数据
                    b[i] += 256;
                }
            }
            out.write(b);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            out.flush();
            out.close();
            return true;
        }
    }
}

执行测试用例

        String base64 = Base64ToImageUtils.GetImageStr("D:\\test\\dog.jpg");
        System.out.println("base64");
        System.out.println(base64);
        Base64ToImageUtils.GenerateImage(base64, "D:\\test\\dog2.jpg");
        System.out.println("base64 转图片");