1 在java代码里对图片进行base64编码和解码

package com.jovision.image;

import java.io.FileInputStream;
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 Base64Image {

 public static void main(String[] args) 
     { 
         String strImg = GetImageStr(); 
         System.out.println(strImg);
         GenerateImage(strImg); 
     } 
     public static String GetImageStr() 
     {//将图片文件转化为字节数组字符串，并对其进行Base64编码处理  
         String imgFile = "D:\\tmp\\100.png";//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(); 
         return encoder.encode(data);//返回Base64编码过的字节数组字符串  
     } 
     public static boolean GenerateImage(String imgStr) 
     {//对字节数组字符串进行Base64解码并生成图片  
         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:\\tmp\\101.png";//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; 
         } 
     } 

}

2 在html页面下展示base64编码的图片 代码如下

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCA...“/>