base64实现文件与字符串之间的转换(转)

 

例子如下:

 

package com.ysj;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * 适用大部分格式的文件
 * @author Administrator
 *
 */
public class Test {
	public static void main(String[] args) {
		 Test t = new Test(); 
		 //String str = t.GetImageStr("D:/My Documents/scriptxReg.zip");
		 //String str = t.GetImageStr("D:/My Documents/ip.jpg");
		 String str = t.GetImageStr("D:/My Documents/哎呀妈呀哎呀妈呀真漂亮.mp3");
		 System.out.println(str);
		 //boolean flag = t.GenerateImage(str, "D:/My Documents/scriptxReg.zip");
		 //boolean flag = t.GenerateImage(str, "D:/My Documents/ip.jpg");
		 boolean flag = t.GenerateImage(str, "D:/My Documents/哎呀妈呀哎呀妈呀真漂亮B.mp3");
		 System.out.println(flag);
	}
    /**
     * 将文件转化为字节数组字符串，并对其进行Base64编码处理
     * @param imgFile
     * @return
     */
	public static String GetImageStr(String imgFile) {
		InputStream in = null;
		byte[] data = null;
		// 读取文件字节数组
		try {
			in = new FileInputStream(imgFile);
			data = new byte[in.available()];
			in.read(data);
			in.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		// 对字节数组Base64编码
		BASE64Encoder encoder = new BASE64Encoder();
		// 返回Base64编码过的字节数组字符串
		return encoder.encode(data);
	}
    
	/**
	 * 根据字节数组字符串进行Base64解码并生成文件
	 * @param imgStr
	 * @param savedImagePath
	 * @return
	 */
	public static boolean GenerateImage(String imgStr, String savedImagePath) {
		// 文件字节数组字符串数据为空
		if (imgStr == null) 
			return false;
		BASE64Decoder decoder = new BASE64Decoder();
		try {
			// Base64解码
			byte[] b = decoder.decodeBuffer(imgStr);
			for (int i = 0; i < b.length; ++i) {
				{// 调整异常数据
				if (b[i] < 0) 
					b[i] += 256;
				}
			}
			// 生成文件
			// String sangImageStr = "D:/My Documents/ip.jpg" ;  // 要生成文件的路径.
			OutputStream out = new FileOutputStream(savedImagePath);
			out.write(b);
			out.flush();
			out.close();
			return true;
		} catch (Exception e) {
			return false;
		}
	}

}