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Java Base64 Encoding and Decoding - Java 147

Java Base64 Encoding and Decoding – Java 147

Java Base64 Encoding and Decoding

在 Java 8 現在具有用於 Base64 編碼的內建編碼器和解碼器，其中之一基本編碼器，會將輸出映射到 A-Za-z0-9+/ 中的一組字元，編碼器不會在輸出中添加任何換行，解碼器會拒絕 A-Za-z0-9+/ 之外的任何字元，同時也使用 Apache Commons Codec 的實用 API 進行編解碼， Base64 Encoding and Decoding in Java 本篇增加了範例，並透過單元測試來驗證產出結果。

檔案目錄

./
   +- src
       +- test
       |   +- org
       |       +- ruoxue
       |           +- java_147
       |               +- base64
       |                   +- basic
       |                       +- EncodingDecodingTest.java

單元測試

Java Base64 Encoder Decoder 提供 Base64 基本編碼器操作，將位元組編碼成 Base64 ，並將 Base64 字串解碼為普通字串。

encode

建立一個 String ，轉成 byte[] ，使用 Base64.Encoder 進行編碼。

	@Test
	public void encode() throws Exception {
		Base64.Encoder encoder = Base64.getEncoder();
		String value = "Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484";
		System.out.println(value);
		byte[] result = encoder.encode(value.getBytes(StandardCharsets.UTF_8.toString()));
		System.out.println(result);
		System.out.println(new String(result));
		assertThat(new String(result)).isEqualTo(
				"SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA==");
	}

Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484
[B@6aa8ceb6
SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA==

decode

Java Base64 Encoder Decoder 建立一個 String ，轉成 byte[] ，使用 Base64.Decoder 進行解碼。

	@Test
	public void decode() throws Exception {
		Base64.Decoder decoder = Base64.getDecoder();
		String value = "SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA==";
		System.out.println(value);
		byte[] result = decoder.decode(value.getBytes(StandardCharsets.UTF_8.toString()));
		System.out.println(result);
		System.out.println(new String(result));
		assertThat(new String(result)).isEqualTo("Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484");
	}
SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA==
[B@6aa8ceb6
Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484

encodeWithoutPadding

Java Base64 Encoder Decoder 建立一個 String ，轉成 byte[] ，使用 Base64.Encoder 不進行填充的編碼。

	@Test
	public void encodeWithoutPadding() throws Exception {
		Base64.Encoder encoder = Base64.getEncoder();
		String value = "Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484";
		System.out.println(value);
		byte[] result = encoder.withoutPadding().encode(value.getBytes(StandardCharsets.UTF_8.toString()));
		System.out.println(result);
		System.out.println(new String(result));
		assertThat(new String(result)).isEqualTo(
				"SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA");
	}
Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484
[B@6aa8ceb6
SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA

decodeWithoutPadding

Java Base64 Encoder Decoder 建立一個 String ，編碼不進行填充 ，轉成 byte[] ，使用 Base64.Decoder 解碼。

	@Test
	public void decodeWithoutPadding() throws Exception {
		Base64.Decoder decoder = Base64.getDecoder();
		String value = "SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA";
		System.out.println(value);
		byte[] result = decoder.decode(value.getBytes(StandardCharsets.UTF_8.toString()));
		System.out.println(result);
		System.out.println(new String(result));
		assertThat(new String(result)).isEqualTo("Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484");
	}
SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA
[B@6aa8ceb6
Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484

Base64_encodeBase64

建立一個 String ，轉成 byte[] 使用 Apache Commons Codec 套件 Base64 進行編碼。

	@Test
	public void Base64_encodeBase64() throws Exception {
		String value = "Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484";
		System.out.println(value);
		byte[] result = org.apache.commons.codec.binary.Base64
				.encodeBase64(value.getBytes(StandardCharsets.UTF_8.toString()));
		System.out.println(result);
		System.out.println(new String(result));
		assertThat(new String(result)).isEqualTo(
				"SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA==");
	}
Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484
[B@4c98385c
SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA==

Base64_decodeBase64

建立一個 String ，轉成 byte[] 使用 Apache Commons Codec 套件 Base64 進行解碼。

	@Test
	public void Base64_decodeBase64() throws Exception {
		String value = "SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA==";
		System.out.println(value);
		byte[] result = org.apache.commons.codec.binary.Base64
				.decodeBase64(value.getBytes(StandardCharsets.UTF_8.toString()));
		System.out.println(result);
		System.out.println(new String(result));
		assertThat(new String(result)).isEqualTo("Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484");
	}
SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA==
[B@4c98385c
Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484

EncodingDecodingTest.java

Base64 Encoder Decoder in Java 新增單元測試，驗證 Java Base64 Encoding Decoding 是否符合預期。

package org.ruoxue.java_147.base64.basic;

import static org.assertj.core.api.Assertions.assertThat;

import java.nio.charset.StandardCharsets;
import java.util.Base64;

import org.junit.Test;

public class EncodingDecodingTest {

	@Test
	public void encode() throws Exception {
		Base64.Encoder encoder = Base64.getEncoder();
		String value = "Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484";
		System.out.println(value);
		byte[] result = encoder.encode(value.getBytes(StandardCharsets.UTF_8.toString()));
		System.out.println(result);
		System.out.println(new String(result));
		assertThat(new String(result)).isEqualTo(
				"SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA==");
	}

	@Test
	public void decode() throws Exception {
		Base64.Decoder decoder = Base64.getDecoder();
		String value = "SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA==";
		System.out.println(value);
		byte[] result = decoder.decode(value.getBytes(StandardCharsets.UTF_8.toString()));
		System.out.println(result);
		System.out.println(new String(result));
		assertThat(new String(result)).isEqualTo("Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484");
	}

	@Test
	public void encodeWithoutPadding() throws Exception {
		Base64.Encoder encoder = Base64.getEncoder();
		String value = "Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484";
		System.out.println(value);
		byte[] result = encoder.withoutPadding().encode(value.getBytes(StandardCharsets.UTF_8.toString()));
		System.out.println(result);
		System.out.println(new String(result));
		assertThat(new String(result)).isEqualTo(
				"SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA");
	}

	@Test
	public void decodeWithoutPadding() throws Exception {
		Base64.Decoder decoder = Base64.getDecoder();
		String value = "SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA";
		System.out.println(value);
		byte[] result = decoder.decode(value.getBytes(StandardCharsets.UTF_8.toString()));
		System.out.println(result);
		System.out.println(new String(result));
		assertThat(new String(result)).isEqualTo("Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484");
	}

	@Test
	public void Base64_encodeBase64() throws Exception {
		String value = "Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484";
		System.out.println(value);
		byte[] result = org.apache.commons.codec.binary.Base64
				.encodeBase64(value.getBytes(StandardCharsets.UTF_8.toString()));
		System.out.println(result);
		System.out.println(new String(result));
		assertThat(new String(result)).isEqualTo(
				"SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA==");
	}

	@Test
	public void Base64_decodeBase64() throws Exception {
		String value = "SmF2YSAxNDcsIFNwcmluZyBib290IDE2OCwgSnVuaXQgMTUxLCBBc3NlcnRKIDE1NSwgQmFzaCA0NjAsIElUIDQ4NA==";
		System.out.println(value);
		byte[] result = org.apache.commons.codec.binary.Base64
				.decodeBase64(value.getBytes(StandardCharsets.UTF_8.toString()));
		System.out.println(result);
		System.out.println(new String(result));
		assertThat(new String(result)).isEqualTo("Java 147, Spring boot 168, Junit 151, AssertJ 155, Bash 460, IT 484");
	}
}

心得分享

Java Base64 Encoding Decoding 依照 RFC 4648 中指定的 Base64 字母表，輸出映射到一組字元 A-Za-z0-9+/ ，不添加任何行分隔符號，熟悉 Base64 Encoder Decoder in Java 工具類別提供的靜態方法，取得基本編碼器，進行編碼解碼的操作。

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