java文件编码和解码

来源：互联网发布：怎么恢复手机内置数据编辑：程序博客网时间：2024/06/06 20:08

package com.easy.mytest.util;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class T {

public static byte[] getBytes(String filePath) {
  byte[] buffer = null;
  try {
   File file = new File(filePath);
   FileInputStream fis = new FileInputStream(file);
   ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
   byte[] b = new byte[1000];
   int n;
   while ((n = fis.read(b)) != -1) {
    bos.write(b, 0, n);
   }
   fis.close();
   bos.close();
   buffer = bos.toByteArray();
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
  return buffer;
}

public static void main(String[] args) {
  // TODO Auto-generated method stub
  String str = encode(getBytes("c:\\2014.doc"));
  byte[] bb = decode(str);
  getFile(bb,"c:","aaabbb.doc");
}

// 编码
     public static String encode(byte[] bstr) {
        sun.misc.BASE64Encoder encode = new sun.misc.BASE64Encoder();
        String s = encode.encodeBuffer(bstr);
         return s;
     }

     // 解码
     public static byte[] decode(String str) {
         byte[] bt = null;
        try {
             sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();
             bt = decoder.decodeBuffer(str);
         } catch (IOException e) {
             e.printStackTrace();
         }
         return bt;
     }

/**
     * 根据byte数组，生成文件
     */
    public static void getFile(byte[] bfile, String filePath,String fileName) {
        BufferedOutputStream bos = null;
        FileOutputStream fos = null;
        File file = null;
        try {
            File dir = new File(filePath);
            if(!dir.exists()&&dir.isDirectory()){//判断文件目录是否存在
                dir.mkdirs();
            }
            file = new File(filePath+"\\"+fileName);
            fos = new FileOutputStream(file);
            bos = new BufferedOutputStream(fos);
            bos.write(bfile);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (bos != null) {
                try {
                    bos.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
    }
}

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