base64.java

是一个应用型java网站例子

//BASE加密类
package com.neck.math;

import java.io.PrintWriter;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.io.FileNotFoundException;
import java.util.Scanner;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class BASE64 
    {
    //将s进行BASE64编码
    public static String getBASE64EncoderStr(String s) throws UnsupportedEncodingException
     {
        if (null == s)
            return null;
        else
            return new BASE64Encoder().encode(s.getBytes());
    }
   
    
    //将s进行BASE64解码
    public static byte[] getBASE64DecoderBt(String s) throws IOException
    {
        if (null == s)
            return null;
        else
        {
            BASE64Decoder decoder = new BASE64Decoder();
            return decoder.decodeBuffer(s);
        }

    }

    //将指定文件用BASE64编码
    public static void changeToBASE64(String filePath) throws IOException
    {
        Scanner sc = new Scanner(new FileInputStream(filePath)).useDelimiter(" ");
        PrintWriter pw = new PrintWriter(filePath + "_BASE64_");
        while (sc.hasNext())
        {
            pw.println(getBASE64EncoderStr(sc.next()));
        }
        sc.close();
        pw.close();
    }
    
    //将指定文件从BASE64解码
    public static void recoverFromBASE64(String filePath) throws IOException, FileNotFoundException
    {
        Scanner sc = new Scanner(new FileInputStream(filePath)).useDelimiter(" ");
        PrintWriter out = new PrintWriter(filePath.substring(0, filePath.indexOf("_BASE64_")));
        while (sc.hasNext())
        {
            out.println(new String(getBASE64DecoderBt(sc.next()), "GB2312"));
        }
        sc.close();
        out.close();
    }
}