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

// 傳入圖片路徑，獲取圖片
FileInputStream fis = new FileInputStream("/Users/curry/error.png");
BufferedInputStream bis = new BufferedInputStream(fis);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] buff = new byte[1024];
int len = 0;
while ((len = fis.read(buff)) != -1) {
  bos.write(buff, 0, len);
}
// 得到圖片的字節(jié)數(shù)組
byte[] result = bos.toByteArray();
// 將數(shù)組轉(zhuǎn)為字符串
BASE64Encoder encoder = new BASE64Encoder();
String str = encoder.encode(result).trim();

import sun.misc.BASE64Decoder;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

BASE64Decoder decoder = new BASE64Decoder();
byte[] imgbyte = decoder.decodeBuffer("剛剛將字節(jié)數(shù)組轉(zhuǎn)成的字符串");
OutputStream os = new FileOutputStream("/Users/curry/text.png");
os.write(imgbyte, 0, imgbyte.length);
os.flush();
os.close();

public class Base64Convert {

  /**
   * @Description： 圖片轉(zhuǎn)化成base64字符串
   * @param:  path
   * @Return:
   */
  public static String GetImageStr(String path)
  {
    //將圖片文件轉(zhuǎn)化為字節(jié)數(shù)組字符串，并對其進行Base64編碼處理
    //待處理的圖片
    String imgFile = path;
    InputStream in = null;
    byte[] data = null;
    //讀取圖片字節(jié)數(shù)組
    try
    {
      in = new FileInputStream(imgFile);
      data = new byte[in.available()];
      in.read(data);
      in.close();
    }
    catch (IOException e)
    {
      e.printStackTrace();
    }
    //對字節(jié)數(shù)組Base64編碼
    BASE64Encoder encoder = new BASE64Encoder();
    //返回Base64編碼過的字節(jié)數(shù)組字符串
    return encoder.encode(data);
  }
  /**
   * @Description： base64字符串轉(zhuǎn)化成圖片
   * @param:   imgStr
   * @Return:
   */
  public static boolean GenerateImage(String imgStr,String photoname)
  {
    //對字節(jié)數(shù)組字符串進行Base64解碼并生成圖片
    //圖像數(shù)據(jù)為空
    if (imgStr == null)
      return false;

    BASE64Decoder decoder = new BASE64Decoder();
    try
    {
      //Base64解碼
      byte[] b = decoder.decodeBuffer(imgStr);
      for(int i=0;i<b.length;++i)
      {
        if(b[i]<0)
        {
          //調(diào)整異常數(shù)據(jù)
          b[i]+=256;
        }
      }
      //生成jpeg圖片
      String imagePath= Config.getUploadPhysicalPath();
      //System.currentTimeMillis()
      //新生成的圖片
      String imgFilePath = imagePath+photoname;
      OutputStream out = new FileOutputStream(imgFilePath);
      out.write(b);
      out.flush();
      out.close();
      return true;
    }
    catch (Exception e)
    {
      return false;
    }
  }
}