文件格式转换

分手后的思念是犯贱 2022-08-27 11:59 178阅读 0赞

/\*  
 \* Base64.java  
 \*  
 \* Created on 2008-5-5, 11:11:32  
 \*  
 \* To change this template, choose Tools | Templates  
 \* and open the template in the editor.  
 \*/

package com.mop.pushmail.utils;

import javax.mail.internet.MimeUtility;  
import java.io.BufferedReader;  
import java.io.ByteArrayInputStream;  
import java.io.ByteArrayOutputStream;  
import java.io.FileInputStream;  
import java.io.InputStreamReader;  
//import java.io.RandomAccessFile;  
/\*\*  
 \*  
 \* @author muning  
 \*/  
public class Base64 \{

public Base64() \{  
    \}  
     
    public static BufferedReader decode(String b64string) throws Exception \{  
        return new BufferedReader(  
                new InputStreamReader(  
                MimeUtility.decode(  
                new ByteArrayInputStream(b64string.getBytes()), "base64")));  
    \}  
     
    public static void main(String args\[\]) throws Exception\{  
//        if (args.length != 2)\{  
//            System.err.println("Usage: java Base64 encORdec yourStrings");  
//            System.exit(0);  
//        \}  
         
//        String str1 = args\[0\].trim();  
//        String str1 = "dec";  
//        String str2 = "好人";  
//        String str3 = "";  
//        if (str1.equalsIgnoreCase("enc"))\{  
//            System.out.println(encodeAsString(str2));  
//        \}  
//        else if(str1.equalsIgnoreCase("dec"))\{  
//            System.out.println(decodeAsString(str3));  
//        \}  
//        else\{  
//            System.err.println("Usage: java Base64 encORdec yourStrings");  
//            System.exit(0);  
//        \}  
//        String filename = "D://111.pdf";  
//        Base64Encode(filename);  
//        String filename1 = "D://111.txt";  
//        Base64Decode(filename1);  
         
//        System.out.println(System.getProperties());  
        String test = "穆宁";  
        byte\[\] bytes = test.getBytes("UTF-8");  
        String result = new String(bytes, "UTF-8");  
        System.out.println("Receive value: \[" + result + "\].");  
    \}  
     
    public static String Base64Encode(String filename) \{  
        //int ret = -1;  
        String content = null;  
        FileInputStream fileforinput = null;  
        try \{  
            fileforinput = new FileInputStream(filename);  
            byte\[\] bytes = new byte\[fileforinput.available()\];    
            fileforinput.read(bytes);    
            content = new sun.misc.BASE64Encoder().encode(bytes);  
            fileforinput.close();  
            return content;  
//            RandomAccessFile inOut = new RandomAccessFile("d://doc64.txt","rw");  
//            inOut.write(content.getBytes());  
//            inOut.close();  
//            ret = 0;  
        \}  
        catch (Exception ex) \{  
            ex.printStackTrace();  
            return null;  
        \}  
       // return ret;  
    \}  
     
    // 文件内容是base64编码的，还原成base64编码前的模样  
    public static byte\[\] Base64Decode(String filename) \{  
        String original = null;  
        FileInputStream fis = null;  
        byte\[\] bytes = null;  
        byte\[\] result = null;  
        try \{  
            fis = new FileInputStream(filename);  
            bytes = new byte\[fis.available()\];  
            fis.read(bytes);  
            original = new String(bytes);  
//            String temp = new String(bytes,"utf-8");  
//            original = new String(temp.getBytes("iso-8859-1"),"utf-8");  
            result  = new sun.misc.BASE64Decoder().decodeBuffer(original.trim());    
        \}  
        catch (Exception ex) \{  
            ex.printStackTrace();  
        \}  
        return result;  
    \}  
     
    public static String decodeAsString(String b64string) throws Exception \{  
        if (b64string == null) \{  
            return b64string;  
        \}  
         
        String returnString = decode(b64string).readLine();  
        if (returnString == null) \{  
            return returnString;  
        \}  
         
        return returnString.trim();  
    \}  
     
    public static ByteArrayOutputStream encode(String plaintext,String charset) throws Exception\{  
        ByteArrayOutputStream out = new ByteArrayOutputStream();  
        byte\[\] in = plaintext.getBytes(charset);  
        ByteArrayOutputStream inStream = new ByteArrayOutputStream();  
        inStream.write(in, 0, in.length);  
        // pad  
        if ((in.length % 3 ) == 1)\{  
            inStream.write(0);  
            inStream.write(0);  
        \}  
        else if((in.length % 3 ) == 2)\{  
            inStream.write(0);  
        \}  
         
        inStream.writeTo( MimeUtility.encode(out, "base64") );  
        return out;  
    \}  
     
     public static String encodeAsString(String plaintext) throws Exception \{  
        return encode(plaintext,"UTF-8").toString();  
    \}  
     
    public static String encodeAsString(String plaintext,String charset) throws Exception \{  
        return encode(plaintext,charset).toString();  
    \}  
\}