功能的實現應用到了java io

以下是代碼實現：

package myProject;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Base64;
import java.util.Base64.Decoder;
import java.util.Base64.Encoder;



 
public class ImageString {
    public static void main(String[] args){
        File file =new File("D:\\1.jpg");
        File file_new=new File("D:\\images\\2.jpg");
        try{
            //讀圖片文件（圖片轉化成字符串）
            FileInputStream fileInputStream=new FileInputStream(file);
            BufferedInputStream bufferedInputStream
 
=new BufferedInputStream(fileInputStream);
            byte[] b=new byte[bufferedInputStream.available()];
            bufferedInputStream.read(b);
            bufferedInputStream.close();
            fileInputStream.close();
            // 對字節數組Base64編碼
            Encoder encoder=Base64.getEncoder();
           
 
// BASE64Encoder encoder = new BASE64Encoder();
            // 返回Base64編碼過的字節數組字符串
           // String str=encoder.encode(b);
            String str=encoder.encodeToString(b);
            System.out.println(str);
            
            
            //字符串轉化成圖片
            //將讀的內容寫入新的文件
            if(!file_new.exists()){
                file_new.createNewFile();
            }
            FileOutputStream fileOutputStream=new FileOutputStream(file_new);
            BufferedOutputStream bufferedOutputStream=new BufferedOutputStream(fileOutputStream);
            //解碼
            //BASE64Decoder decoder = new BASE64Decoder();
            //byte[] b2=decoder.decodeBuffer(str);
            Decoder decoder=Base64.getDecoder();
            byte[] b2=decoder.decode(str);                    
            bufferedOutputStream.write(b2);
            bufferedOutputStream.flush();
            bufferedOutputStream.close();
            fileOutputStream.close();
            
            
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

這裏用到了BASE64編碼解碼

圖片和字符串相互轉化