Base64编码与字符集

package com.baifubao.supergw.common.util;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang.UnhandledException;
import org.junit.Test;
import org.junit.Assert;

import java.io.UnsupportedEncodingException;

import static org.junit.Assert.assertTrue;

public class Base64Test {
    @Test
    public void diffCharset() {
        String msg = "中文编码base64后屏蔽字符集";
        try {
            // utf-8编码、base64编码、utf-8解码
            String base64msg = Base64.encodeBase64String(msg.getBytes("utf-8"));
            System.out.println("base:" + base64msg);
            // gbk 编码
            byte[] deBase64 = base64msg.getBytes("gbk");
            // utf-8 解码
            String utf8msg = new String(deBase64, "utf-8");
            System.out.println("utf8:" + utf8msg);
            assertTrue(base64msg.equals(utf8msg));
            // 原文使用gbk解码
            String gbk = new String(Base64.decodeBase64(base64msg.getBytes()),"gbk");
            // 非ASCII字符编码、解码使用字符集不一致会导致乱码
            // 而BASE64编码字符都是ASCII表内，使用不一致的字符集编解码也不会有乱码
            // 因为ASCII字符很多字符集是兼容的
            System.out.println(gbk);
        }catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

    }
}