package com.fzzy.igds.utils;
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import lombok.extern.slf4j.Slf4j;
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import sun.misc.BASE64Decoder;
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import sun.misc.BASE64Encoder;
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import java.io.*;
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import java.util.Base64;
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/**
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* @Description 图片Base处理
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* @Author CZT
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* @Date 2026/1/7 11:07
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*/
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@Slf4j
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public class Base64Util {
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public static String BASE_IMG_START = "data:image/jpg;base64,";
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/**
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* 根据地址，把图片转换为Base64字符串
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* <p>
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* data:image/jpg;base64,
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*
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* @param diskFile
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* @return
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*/
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public static String getImageStr(String diskFile) {
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InputStream in = null;
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byte[] data = null;
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// 读取图片字节数组
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try {
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in = new FileInputStream(diskFile);
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data = new byte[in.available()];
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in.read(data);
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// in.close();
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} catch (IOException e) {
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e.printStackTrace();
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} finally {
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try {
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if (null != in)
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in.close();
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} catch (Exception e) {
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}
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}
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BASE64Encoder encoder = new BASE64Encoder();
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return BASE_IMG_START + encoder.encode(data);
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}
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/**
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* 对字节数组字符串进行Base64解码并生成图片
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*
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* @param imgStr
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* @return
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*/
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public static boolean generateImage(String imgStr, String diskFile) {
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if (imgStr == null)
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return false;
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if (imgStr.startsWith("data:")) {
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imgStr = imgStr.substring(BASE_IMG_START.length());
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}
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BASE64Decoder decoder = new BASE64Decoder();
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OutputStream out = null;
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try {
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// Base64解码
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byte[] b = decoder.decodeBuffer(imgStr);
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for (int i = 0; i < b.length; ++i) {
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if (b[i] < 0) {
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b[i] += 256;
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}
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}
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// 生成jpeg图片
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out = new FileOutputStream(diskFile);
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out.write(b);
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out.flush();
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// out.close();
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return true;
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} catch (Exception e) {
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return false;
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} finally {
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try {
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if (null != out)
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out.close();
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} catch (Exception e) {
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}
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}
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}
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/**
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* base64转为图片
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*
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* @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
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* @param base64
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* @return
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*/
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public static String base64ToJpg(String path, String fileName, String base64) {
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// 判断文件路径是否存在
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File filePath = new File(path);
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if (!filePath.exists()) {
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filePath.mkdirs();
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}
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// 创建文件
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String jpgFile = path + "\\" + fileName + ".jpg";
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File file = new File(jpgFile);
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boolean jpgFileExist = false;
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try {
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jpgFileExist = file.createNewFile();
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log.info("jpg文件创建成功");
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} catch (IOException e) {
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log.info("jpg文件创建失败");
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e.printStackTrace();
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}
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if (jpgFileExist) {
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// 解密
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Base64.Decoder decoder = Base64.getDecoder();
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// 去掉base64前缀 data:image/jpeg;base64,
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base64 = base64.substring(base64.indexOf(",", 1) + 1, base64.length());
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byte[] b = decoder.decode(base64);
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// 处理数据
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for (int i = 0; i < b.length; ++i) {
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if (b[i] < 0) {
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b[i] += 256;
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}
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}
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// 保存图片
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try {
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FileOutputStream out = new FileOutputStream(jpgFile);
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out.write(b);
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out.flush();
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out.close();
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// 写入成功返回文件路径
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return jpgFile;
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} catch (FileNotFoundException e) {
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log.info("文件未找到");
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e.printStackTrace();
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} catch (IOException e) {
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log.info("写入失败");
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e.printStackTrace();
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}
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}
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return "文件不存在";
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}
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}
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