Base64

Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation.

Base64 encoding schemes are commonly used when there is a need to encode binary data that needs to be stored and transferred over media that is designed to deal with textual data.

用到java包

　　　　 <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.10</version>
        </dependency>
        <dependency>
            <groupId>net.sf.json-lib</groupId>
            <artifactId>json-lib</artifactId>
            <version>2.4</version>
            <classifier>jdk15</classifier>
        </dependency>

小样

import java.io.UnsupportedEncodingException;

import net.sf.json.JSONArray;

import org.apache.commons.codec.binary.Base64;

public class Test {
    public static void main(String[] args) throws UnsupportedEncodingException{
        // 工具
        Base64 base64 = new Base64();
        // 现有byte[]
        byte[] bytes = new byte[] { -25, -69, -76, -27, -97, -70, -25, -103, -66, -25, -89, -111 };
        // 转成字符串，存储或者传输
        String s = base64.encodeAsString(bytes); // 57u05Z+655m+56eR
        // 待使用byte[] 时，将字符串解码
        bytes = base64.decode(s);
        System.out.println(JSONArray.fromObject(bytes).toString());
        // 原始byte[] 是这样的
        System.out.println(new String(bytes, "utf-8"));
    }

}

 打印结果：

[-25,-69,-76,-27,-97,-70,-25,-103,-66,-25,-89,-111]
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