把文件base64编码

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

import sun.misc.BASE64Encoder;

/**
 * @author <a href=http://tly.pw>小黑</a>
 */
public class Base64File {
	public static void main(String[] args) {
		if(args.length != 1){
			System.out.println("Usage:Base64File filename");
			return;
		}
		System.out.println(getStr(args[0]));
	}
	
	public static String getStr(String filename) {
		InputStream in = null;
		byte[] data = null;
		try {
			in = new FileInputStream(filename);
			data = new byte[in.available()];
			in.read(data);
			in.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		BASE64Encoder encoder = new BASE64Encoder();
		return encoder.encode(data);// 返回Base64编码过的字节数组字符串
	}
}