一段关于BASE64编解码的代码，请高手指教

[aspirerME]

编码如下：
FileInputStream fin = new FileInputStream("d://test.txt");
BufferedInputStream bin = new BufferedInputStream(fin);
DataInputStream din = new DataInputStream(bin);
String inLine = din.readLine();
String tempString = "";
while(inLine != null)
{
tempString = tempString + inLine;
inLine = din.readLine();
}
String encodedString = (new sun.misc.BASE64Encoder()).encode(tempString.getBytes());



解码如下：
public static String getFromBASE64(String src)
{
if(src == null)
{
return null;
}

try
{
byte[] b = (new sun.misc.BASE64Decoder()).decodeBuffer(src);
return new String(b);
}
catch(Exception e)
{
e.printStackTrace();
return null;
}
}

FileOutputStream fout = new FileOutputStream("c://2005.txt");
BufferedOutputStream bout = new BufferedOutputStream(fout);
DataOutputStream dout = new DataOutputStream(bout);
String s = link.getElementsByTagName("attachment").item(0).getFirstChild().getNodeValue();
// dout.writeBytes(new String(getFromBASE64(s).getBytes("ISO-8859-1"),"UTF-8"));
dout.writeBytes(getFromBASE64(s));


问题是：
我解码得到的文件是乱码，尝试了无数方法还没解决，望高手指教。

[loveyouting]

在中文中用Base64编码的时候会出错..当然解的时候也会咯.....

[aspirerME]

照楼上的说是没有办法了吗？

[humanity]

问题总是有办法解决的吧？不过我不知道。

[aspirerME]

upup

[yyzh]

可能是这里错了
while(inLine != null)
{
tempString = tempString + inLine;
inLine = din.readLine();
}

我手写一段代码，大概的意思，有错误你再修改

//编码
FileInputStream fin = new FileInputStream("d://test.txt");
int len=0;
byte buf[]=new byte[128];
String tempString = null;
if (fin!=null)[
while ((len=fin.read(buf))!=-1){
tempString.write(buf,0,len);
}
}

[liuquanyi]

mark！

[qixin000]

原因在此:
首先你要保证你的文件时原始的系统默认格式ANSI,这样里面的中文不会有问题

但是如果你的文本文件被另存为了utf-8格式的,那个用你的读取文件的方法,就有问题了,因为读到内存里的信息本身就是乱码,当然解析回来的也是乱码,这不是base64的问题,是因为你的文件的存储格式问题

如何解决
如果你的文件是utf8格式的,就不要用你的方法读取了,要以utf8的格式来读取文件(另外你读取文件的方法有些都过时了,不要再这样读取文件了)

package com;

import java.io.*;

/**
* Created by qixin.
* User: qixin
* Date: 2005-11-15
* Time: 12:09:29
*/
public class aa {
public String getEncodeInfo(String filename) throws IOException {
InputStreamReader streamReader = new InputStreamReader(new FileInputStream(filename),"utf-8");
BufferedReader reader = new BufferedReader(streamReader);
String inLine = reader.readLine();
String tempString = "";
while (inLine != null) {
tempString = tempString + inLine;
inLine = reader.readLine();
}
return tempString;
}

public void saveEncodeInfo(String tempString, String outputFilename) throws IOException {
System.out.println("tempString = " + tempString);
String encodedString = (new sun.misc.BASE64Encoder()).encode(tempString.getBytes());
System.out.println("encodedString = " + encodedString);
BufferedWriter writer = new BufferedWriter(new FileWriter(outputFilename));
writer.write(encodedString);
writer.flush();
writer.close();
}


public String getFromBASE64(String filename) throws IOException {
String info = this.getEncodeInfo(filename);
if (info.equals("")) {
return null;
}

try {
byte[] b = (new sun.misc.BASE64Decoder()).decodeBuffer(info);
return new String(b);
}
catch (Exception e) {
e.printStackTrace();
return null;
}
}

public static void main(String[] args) throws IOException {
aa a = new aa();
String info = a.getEncodeInfo("c://test.txt");
a.saveEncodeInfo(info,"c://test1.txt");
String info1 = a.getFromBASE64("c://test1.txt");
System.out.println("info1 = " + info1);
}
}