java之文件与base64字符之间的相互转换

package tiany.demo;

import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileOutputStream;  
  
import sun.misc.BASE64Decoder;  
import sun.misc.BASE64Encoder;  
  
public class FileUitl {  
  
 /** 
  * 将文件转成base64 字符串 
  * @param path文件路径 
  * @return  *  
  * @throws Exception 
  */  
  
 public static String encodeBase64File(String path) throws Exception {  
  File file = new File(path);;  
  FileInputStream inputFile = new FileInputStream(file);  
  byte[] buffer = new byte[(int) file.length()];  
  inputFile.read(buffer);  
  inputFile.close();  
  return new BASE64Encoder().encode(buffer);  
  
 }  
  
 /** 
  * 将base64字符解码保存文件 
  * @param base64Code 
  * @param targetPath 
  * @throws Exception 
  */  
  
 public static void decoderBase64File(String base64Code, String targetPath)  
   throws Exception {  
  byte[] buffer = new BASE64Decoder().decodeBuffer(base64Code);  
  FileOutputStream out = new FileOutputStream(targetPath);  
  out.write(buffer);  
  out.close();  
  
 }  
  
 /** 
  * 将base64字符保存文本文件 
  * @param base64Code 
  * @param targetPath 
  * @throws Exception 
  */  
  
 public static void toFile(String base64Code, String targetPath)  
   throws Exception {  
  
  byte[] buffer = base64Code.getBytes();  
  FileOutputStream out = new FileOutputStream(targetPath);  
  out.write(buffer);  
  out.close();  
 }  
  
 public static void main(String[] args) {  
  try {  
   String base64Code = encodeBase64File("d:/2.png");  
   System.out.println(base64Code);  
   decoderBase64File(base64Code, "d:/22.png");  
   toFile(base64Code, "D:\\333.txt");  
  } catch (Exception e) {  
   e.printStackTrace();  
  
  }  
  
 }  
  
}  

参考
http://blog.csdn.net/hongwangzhang/article/details/50215589