Base64编码出现换行符

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本文介绍了解决在使用commons-codec的Base64进行编码时出现换行符的问题，通过自定义Base64Util工具类或升级至1.5版本，实现了单行非换行的Base64编码。

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最近发现使用commons-codec下的Base64带换行符，解决的方法是用Base64Util 工具类
下面有工具类的源码.

	<dependency>
	  <groupId>commons-codec</groupId>
	  <artifactId>commons-codec</artifactId>
	  <version>1.4</version>
	</dependency>

测试代码

	public static void main(String[] args) {
			String sss = "25/user1:password1";
			String sss63 = Base64.encodeBase64String(sss.getBytes());
			System.out.println(sss63);
			String sss64 = Base64Util.encode(sss.getBytes());
			System.out.println(sss64);
			System.out.println("MjUvdXNlcjE6cGFzc3dvcmQx");
	}

输出如下

MjUvdXNlcjE6cGFzc3dvcmQx

MjUvdXNlcjE6cGFzc3dvcmQx
MjUvdXNlcjE6cGFzc3dvcmQx

工具类


/**
 * Base64 工具类
 */
public class Base64Util {
    private static final char last2byte = (char) Integer.parseInt("00000011", 2);
    private static final char last4byte = (char) Integer.parseInt("00001111", 2);
    private static final char last6byte = (char) Integer.parseInt("00111111", 2);
    private static final char lead6byte = (char) Integer.parseInt("11111100", 2);
    private static final char lead4byte = (char) Integer.parseInt("11110000", 2);
    private static final char lead2byte = (char) Integer.parseInt("11000000", 2);
    private static final char[] encodeTable = new char[]{'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'};
 
    public Base64Util() {
    }
 
    public static String encode(byte[] from) {
        StringBuilder to = new StringBuilder((int) ((double) from.length * 1.34D) + 3);
        int num = 0;
        char currentByte = 0;
 
        int i;
        for (i = 0; i < from.length; ++i) {
            for (num %= 8; num < 8; num += 6) {
                switch (num) {
                    case 0:
                        currentByte = (char) (from[i] & lead6byte);
                        currentByte = (char) (currentByte >>> 2);
                    case 1:
                    case 3:
                    case 5:
                    default:
                        break;
                    case 2:
                        currentByte = (char) (from[i] & last6byte);
                        break;
                    case 4:
                        currentByte = (char) (from[i] & last4byte);
                        currentByte = (char) (currentByte << 2);
                        if (i + 1 < from.length) {
                            currentByte = (char) (currentByte | (from[i + 1] & lead2byte) >>> 6);
                        }
                        break;
                    case 6:
                        currentByte = (char) (from[i] & last2byte);
                        currentByte = (char) (currentByte << 4);
                        if (i + 1 < from.length) {
                            currentByte = (char) (currentByte | (from[i + 1] & lead4byte) >>> 4);
                        }
                }
 
                to.append(encodeTable[currentByte]);
            }
        }
 
        if (to.length() % 4 != 0) {
            for (i = 4 - to.length() % 4; i > 0; --i) {
                to.append("=");
            }
        }
 
        return to.toString();
    }
}

2019年1月14日–更新
或者升级到1.5就可以了

Base64.encodeBase64String

方法介绍


String org.apache.commons.codec.binary.Base64.encodeBase64String(byte[] binaryData)


Encodes binary data using the base64 algorithm but does not chunk the output.NOTE: We changed the behaviour of this method from multi-line chunking (commons-codec-1.4) tosingle-line non-chunking (commons-codec-1.5). 
Parameters:binaryData binary data to encodeReturns:String containing Base64 characters.Since:1.4 (NOTE: 1.4 chunked the output, whereas 1.5 does not).

参考资料1
参考资料2