java base64字符串与图片互相转换

Posted 2022-10-15 G_whang

package com.example.demo.test;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import java.io.*;

/**
 * 图片转换base64字符串
 */
public class Test004 

    public static void main(String[] args) throws Exception 
        String imageStr = GetImageStr();
        System.out.println(imageStr);
        System.out.println("----------------------------");
//        System.out.println(GenerateImage(imageStr));
        byte[] aByte = getByte(imageStr);

        System.out.println(aByte);
        ByteToFile(aByte);

    

    /**
     * 生成图片
     * @param bytes
     * @throws Exception
     */
    public static void ByteToFile(byte[] bytes)throws Exception
        OutputStream out = null;
        try 
            // 生成jpeg图片
            String imgFilePath = "D:\\\\test3.jpg";// 新生成的图片
            out = new FileOutputStream(imgFilePath);
            out.write(bytes);
            out.flush();
            out.close();
         catch (IOException e) 
            e.printStackTrace();
        finally
            out.close();
        
    

    /**
     * 生成二进制文件
     * @param imgStr
     * @return
     */
    public static byte[] getByte(String imgStr)
        if (imgStr == null) 
            // 图像数据为空
            return null;
        
        BASE64Decoder decoder = new BASE64Decoder();
        try 
            // Base64解码
            byte[] b = decoder.decodeBuffer(imgStr);
            for (int i = 0; i < b.length; ++i) 
                if (b[i] < 0) // 调整异常数据
                    b[i] += 256;
                
            
            return b;
         catch (Exception e) 
            return null;
        
    

    // 图片转化成base64字符串
    public static String GetImageStr() 
        String imgFile = "D:\\\\Imei1.jpg";// 待处理的图片
        InputStream in = null;
        byte[] data = null;
        // 读取图片字节数组
        try 
            in = new FileInputStream(imgFile);
            data = new byte[in.available()];
            in.read(data);
            in.close();
         catch (IOException e) 
            e.printStackTrace();
        
        // 对字节数组Base64编码
        BASE64Encoder encoder = new BASE64Encoder();
        System.out.println(encoder.encode(data));
        return encoder.encode(data);// 返回Base64编码过的字节数组字符串
    

    // 对字节数组字符串进行Base64解码并生成图片
    public static boolean GenerateImage(String imgStr) 
        if (imgStr == null) 
            // 图像数据为空
            return false;
        
        BASE64Decoder decoder = new BASE64Decoder();
        try 
            // Base64解码
            byte[] b = decoder.decodeBuffer(imgStr);
            for (int i = 0; i < b.length; ++i) 
                if (b[i] < 0) // 调整异常数据
                    b[i] += 256;
                
            
            // 生成jpeg图片
            String imgFilePath = "D:\\\\test1.jpg";// 新生成的图片
            OutputStream out = new FileOutputStream(imgFilePath);
            out.write(b);
            out.flush();
            out.close();
            return true;
         catch (Exception e) 
            return false;