base64转为图片

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Base64;
import java.util.UUID;

public class Base64Utils {

    public static Logger log = LoggerFactory.getLogger(Base64Utils.class);
    /**
     * base64转为图片
     * @param path
     * 文件路径：到文件夹即可，代码里会在文件夹里生成对应的jpg文件
     * @param base64
     * @return
     */
    public static String base64ToJpg(String path,String base64){
        // 判断文件路径是否存在
        File filePath = new File(path);
        if (!filePath.exists()){
            filePath.mkdirs();
        }
        // 创建文件
        String jpgFile = path + "\\" + UUID.randomUUID() + ".jpg";
        File file = new File(jpgFile);
        boolean jpgFileExist = false;
        try {
            jpgFileExist = file.createNewFile();
            log.info("jpg文件创建成功");
        } catch (IOException e) {
            log.info("jpg文件创建失败");
            e.printStackTrace();
        }
        if (jpgFileExist){
            // 解密
            Base64.Decoder decoder = Base64.getDecoder();
            // 去掉base64前缀 data:image/jpeg;base64,
            base64 = base64.substring(base64.indexOf(",", 1) + 1, base64.length());
            byte[] b = decoder.decode(base64);
            // 处理数据
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {
                    b[i] += 256;
                }
            }
            // 保存图片
            try {
                FileOutputStream out = new FileOutputStream(jpgFile);
                out.write(b);
                out.flush();
                out.close();
                // 写入成功返回文件路径
                return jpgFile;
            } catch (FileNotFoundException e) {
                log.info("文件未找到");
                e.printStackTrace();
            } catch (IOException e) {
                log.info("写入失败");
                e.printStackTrace();
            }
        }
        return "文件不存在";
    }

}