Java8 Base64
In the Java 8, Base64 encoding has become the standard Java class libraries.
Java 8 built Base64 encoded encoder and decoder.
Base64 utility class provides a static method to obtain the following three BASE64 codec:
- Basic: output is mapped to a set of characters A-Za-z0-9 + /, do not add any line coding standard, decoded output supports only A-Za-z0-9 + /.
- URL: output is mapped to a set of characters A-Za-z0-9 + _, output is a URL and file.
- MIME: Output hidden incident MIME-friendly format.Each output line is not more than 76 characters, and '\ r' and follow the '\ n' as the split. Finally, no code output line segmentation.
Embedded class
| No. | Nested classes & Description |
|---|---|
| 1 | static class Base64.Decoder This class implements a decoder for use Base64 encoding to decode the bytes of data. |
| 2 | static class Base64.Encoder This class implements an encoder, use Base64 encoding to encode bytes of data. |
method
| No. | Method Name & Description |
|---|---|
| 1 | static Base64.Decoder getDecoder () Returns a Base64.Decoder, decoding using the basic base64 encoding scheme. |
| 2 | static Base64.Encoder getEncoder () Returns a Base64.Encoder, base64 encoded using basic coding scheme. |
| 3 | static Base64.Decoder getMimeDecoder () Returns a Base64.Decoder, decoding using MIME type base64 encoding scheme. |
| 4 | static Base64.Encoder getMimeEncoder () Returns a Base64.Encoder, base64 encoded using MIME type coding scheme. |
| 5 | static Base64.Encoder getMimeEncoder (int lineLength, byte [] lineSeparator) Returns a Base64.Encoder, base64 encoded using MIME type coding scheme, you can specify the length of each line and a line separator through parameters. |
| 6 | static Base64.Decoder getUrlDecoder () Returns a Base64.Decoder, Decode URL and filename safe base64 encoding scheme. |
| 7 | static Base64.Encoder getUrlEncoder () Returns a Base64.Encoder, encoded using URL and filename safe base64 encoding scheme. |
Note: Many methods Base64 class inherits from java.lang.Objectclass.
Base64 examples
The following example demonstrates the use Base64:
import java.util.Base64;
import java.util.UUID;
import java.io.UnsupportedEncodingException;
public class Java8Tester {
public static void main(String args[]){
try {
// 使用基本编码
String base64encodedString = Base64.getEncoder().encodeToString("w3big?java8".getBytes("utf-8"));
System.out.println("Base64 比那么字符串 (基本) :" + base64encodedString);
// 解码
byte[] base64decodedBytes = Base64.getDecoder().decode(base64encodedString);
System.out.println("原始字符串: " + new String(base64decodedBytes, "utf-8"));
base64encodedString = Base64.getUrlEncoder().encodeToString("TutorialsPoint?java8".getBytes("utf-8"));
System.out.println("Base64 编码字符串 (URL) :" + base64encodedString);
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < 10; ++i) {
stringBuilder.append(UUID.randomUUID().toString());
}
byte[] mimeBytes = stringBuilder.toString().getBytes("utf-8");
String mimeEncodedString = Base64.getMimeEncoder().encodeToString(mimeBytes);
System.out.println("Base64 编码字符串 (MIME) :" + mimeEncodedString);
}catch(UnsupportedEncodingException e){
System.out.println("Error :" + e.getMessage());
}
}
}
Implementation of the above script, output is:
$ javac Java8Tester.java $ java Java8Tester 原始字符串: w3big?java8 Base64 编码字符串 (URL) :VHV0b3JpYWxzUG9pbnQ_amF2YTg= Base64 编码字符串 (MIME) :MjY5OGRlYmEtZDU0ZS00MjY0LWE3NmUtNzFiNTYwY2E4YjM1NmFmMDFlNzQtZDE2NC00MDk3LTlh ZjItYzNkNGJjNmQwOWE2OWM0NDJiN2YtOGM4Ny00MjhkLWJkMzgtMGVlZjFkZjkyYjJhZDUwYzk0 ZWMtNDE5ZC00MTliLWEyMTAtZGMyMjVkYjZiOTE3ZTkxMjljMTgtNjJiZC00YTFiLTg3MzAtOTA0 YzdjYjgxYjQ0YTUxOWNkMTAtNjgxZi00YjQ0LWFkZGMtMzk1YzRkZjIwMjcyMzA0MTQzN2ItYzBk My00MmQyLWJiZTUtOGM0MTlmMWIxM2MxYTY4NmNiOGEtNTkxZS00NDk1LThlN2EtM2RjMTZjMWJk ZWQyZTdhNmZiNDgtNjdiYy00ZmFlLThjNTYtMjcyNDNhMTRhZTkyYjNiNWY2MmEtNTZhYS00ZDhk LWEwZDYtY2I5ZTUwNzJhNGE1