base64编码与解码

import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.MalformedURLException;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.codec.binary.Base64;

import comat.common.utils.StrUtil;

import sun.misc.BASE64Encoder;
import sun.net.www.protocol.http.HttpURLConnection;

 1.base64通用转码类：

public static String GetImageStr(){
    String imgFile = "http://h.hiphotos.baidu.com/image/pic/item/024f78f0f736afc3be94256bb119ebc4b7451227.jpg";
    URL url;
    HttpURLConnection conn = null;
    byte[] data;
    String base64Img;
    String lines = null;
    BufferedInputStream bis = null;
    byte[] in_b = null;
    byte[] buffer;
    try {
    //创建URL对象
       url = new URL(imgFile);
       //返回一个URLConnection对象，它表示到URL所引用的远程对象的连接
       conn = (HttpURLConnection) url.openConnection();
       //设定请求方式
       conn.setRequestMethod("GET");
      //建立到远程对象的实际连接
       conn.connect();
         //返回打开连接读取的输入流
     //输出流
    InputStream in = conn.getInputStream();
       int size = conn.getContentLength(); // 取HTTP请求流长度
       buffer = new byte[size]; // 用于缓存每次读取的数据
       in_b = new byte[size]; // 用于存放结果的数组
       int count = 0;
       int rbyte = 0;
       // 循环读取
       while (count < size){
        rbyte = in.read(buffer); // 每次实际读取长度存于rbyte中 sflj
        for (int i = 0; i < rbyte; i++){
         in_b[count + i] = buffer[i];
        }
        count += rbyte;
       }
    }catch(Exception e){
     System.out.println("null");
    } 
       base64Img = new String(Base64.encodeBase64(in_b));
       System.out.println(base64Img);
   return base64Img;
    }

2.base64通用解码类：

 public static String GenerateImage(String imgStr)
    {     
         byte[] b = Base64.decodeBase64(imgStr);
      String path="D:\\aa.jpg";
         OutputStream out;
   try {
    out = new FileOutputStream(path);
    out.write(b);
    out.flush();
    out.close();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }   
            System.out.println("上传文件成功！");
   return path;
          
    }