Movatterモバイル変換

Class Base64

java.lang.Object
- java.util.Base64

```
public classBase64extendsObject
```
This class consists exclusively of static methods for obtaining encoders and decoders for the Base64 encoding scheme. The implementation of this class supports the following types of Base64 as specified inRFC 4648 andRFC 2045.
- Basic
  Uses "The Base64 Alphabet" as specified in Table 1 of RFC 4648 and RFC 2045 for encoding and decoding operation. The encoder does not add any line feed (line separator) character. The decoder rejects data that contains characters outside the base64 alphabet.
- URL and Filename safe
  Uses the "URL and Filename safe Base64 Alphabet" as specified in Table 2 of RFC 4648 for encoding and decoding. The encoder does not add any line feed (line separator) character. The decoder rejects data that contains characters outside the base64 alphabet.
- MIME
  Uses "The Base64 Alphabet" as specified in Table 1 of RFC 2045 for encoding and decoding operation. The encoded output must be represented in lines of no more than 76 characters each and uses a carriage return'\r' followed immediately by a linefeed'\n' as the line separator. No line separator is added to the end of the encoded output. All line separators or other characters not found in the base64 alphabet table are ignored in decoding operation.
Unless otherwise noted, passing anull argument to a method of this class will cause aNullPointerException to be thrown.
Since:
1.8

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`Base64.Decoder`	This class implements a decoder for decoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.
`static class`	`Base64.Encoder`	This class implements an encoder for encoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`staticBase64.Decoder`	`getDecoder()`	Returns a`Base64.Decoder` that decodes using theBasic type base64 encoding scheme.
`staticBase64.Encoder`	`getEncoder()`	Returns a`Base64.Encoder` that encodes using theBasic type base64 encoding scheme.
`staticBase64.Decoder`	`getMimeDecoder()`	Returns a`Base64.Decoder` that decodes using theMIME type base64 decoding scheme.
`staticBase64.Encoder`	`getMimeEncoder()`	Returns a`Base64.Encoder` that encodes using theMIME type base64 encoding scheme.
`staticBase64.Encoder`	`getMimeEncoder(int lineLength, byte[] lineSeparator)`	Returns a`Base64.Encoder` that encodes using theMIME type base64 encoding scheme with specified line length and line separators.
`staticBase64.Decoder`	`getUrlDecoder()`	Returns a`Base64.Decoder` that decodes using theURL and Filename safe type base64 encoding scheme.
`staticBase64.Encoder`	`getUrlEncoder()`	Returns a`Base64.Encoder` that encodes using theURL and Filename safe type base64 encoding scheme.

Methods declared in class java.lang.Object
clone,equals,finalize,getClass,hashCode,notify,notifyAll,toString,wait,wait,wait

- Method Detail
  - getEncoder
```
public static Base64.Encoder getEncoder()
```
    Returns aBase64.Encoder that encodes using theBasic type base64 encoding scheme.
    Returns:
    A Base64 encoder.
  - getUrlEncoder
```
public static Base64.Encoder getUrlEncoder()
```
    Returns aBase64.Encoder that encodes using theURL and Filename safe type base64 encoding scheme.
    Returns:
    A Base64 encoder.
  - getMimeEncoder
```
public static Base64.Encoder getMimeEncoder()
```
    Returns aBase64.Encoder that encodes using theMIME type base64 encoding scheme.
    Returns:
    A Base64 encoder.
  - getMimeEncoder
```
public static Base64.Encoder getMimeEncoder(int lineLength,                                            byte[] lineSeparator)
```
    Returns aBase64.Encoder that encodes using theMIME type base64 encoding scheme with specified line length and line separators.
    Parameters:
    lineLength - the length of each output line (rounded down to nearest multiple of 4). If the rounded down line length is not a positive value, the output will not be separated in lines
    lineSeparator - the line separator for each output line
    Returns:
    A Base64 encoder.
    Throws:
    IllegalArgumentException - iflineSeparator includes any character of "The Base64 Alphabet" as specified in Table 1 of RFC 2045.
  - getDecoder
```
public static Base64.Decoder getDecoder()
```
    Returns aBase64.Decoder that decodes using theBasic type base64 encoding scheme.
    Returns:
    A Base64 decoder.
  - getUrlDecoder
```
public static Base64.Decoder getUrlDecoder()
```
    Returns aBase64.Decoder that decodes using theURL and Filename safe type base64 encoding scheme.
    Returns:
    A Base64 decoder.
  - getMimeDecoder
```
public static Base64.Decoder getMimeDecoder()
```
    Returns aBase64.Decoder that decodes using theMIME type base64 decoding scheme.
    Returns:
    A Base64 decoder.

Movatterモバイル変換

Class Base64

Nested Class Summary

Method Summary

Methods declared in class java.lang.Object

Method Detail

getEncoder

getUrlEncoder

getMimeEncoder

getMimeEncoder

getDecoder

getUrlDecoder

getMimeDecoder