import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import sun.misc.BASE64Decoder; 
import sun.misc.BASE64Encoder; 
public class Base64Test  
{ 
  public static void main(String[] args) 
  { 
    String strImg = GetImageStr(); 
    System.out.println(strImg); 
    GenerateImage(strImg); 
  } 
  //圖片轉(zhuǎn)化成base64字符串 
  public static String GetImageStr() 
  {//將圖片文件轉(zhuǎn)化為字節(jié)數(shù)組字符串，并對其進(jìn)行Base64編碼處理 
    String imgFile = "D:\\tupian\\a.jpg";//待處理的圖片 
    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(); 
    return encoder.encode(data);//返回Base64編碼過的字節(jié)數(shù)組字符串 
  } 
   
  //base64字符串轉(zhuǎn)化成圖片 
  public static boolean GenerateImage(String imgStr) 
  {  //對字節(jié)數(shù)組字符串進(jìn)行Base64解碼并生成圖片 
    if (imgStr == null) //圖像數(shù)據(jù)為空 
      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 imgFilePath = "D:\\tupian\\new.jpg";//新生成的圖片 
      OutputStream out = new FileOutputStream(imgFilePath);   
      out.write(b); 
      out.flush(); 
      out.close(); 
      return true; 
    }  
    catch (Exception e)  
    { 
      return false; 
    } 
  } 
}