base64 图片字符转换 加码解码

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 base64topng

{

public static void main(String[] args)

{

String strImg = GetImageStr();

// s = s.replace(" ", "\\+");

// System.out.println(s);

//

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:\\a.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();

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:\\222.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;

}

}

public static String getBASE64(String s) {

if (s == null)

return null;

return (new sun.misc.BASE64Encoder()).encode(s.getBytes());

}

// 将 BASE64 编码的字符串 s 进行解码

public static String getFromBASE64(String s) {

if (s == null)

return null;

BASE64Decoder decoder = new BASE64Decoder();

try {

byte[] b = decoder.decodeBuffer(s);

return new String(b);

} catch (Exception e) {

return null;

}

}

}