java.lang.Object
- com.qiniu.util.Base64

```
public final class Base64
extends java.lang.Object
```
Utilities for encoding and decoding the Base64 representation of binary data. See RFCs 2045 and 3548.

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`CRLF`	Encoder flag bit to indicate lines should be terminated with a CRLF pair instead of just an LF.
`static int`	`DEFAULT`	Default values for encoder/decoder flags.
`static int`	`NO_CLOSE`	Flag to pass to indicate that it should not close the output stream it is wrapping when it itself is closed.
`static int`	`NO_PADDING`	Encoder flag bit to omit the padding '=' characters at the end of the output (if any).
`static int`	`NO_WRAP`	Encoder flag bit to omit all line terminators (i.e., the output will be on one long line).
`static int`	`URL_SAFE`	Encoder/decoder flag bit to indicate using the "URL and filename safe" variant of Base64 (see RFC 3548 section 4) where `-` and `_` are used in place of `+` and `/`.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static byte[]`	`decode(byte[] input, int flags)`	Decode the Base64-encoded data in input and return the data in a new byte array.
`static byte[]`	`decode(byte[] input, int offset, int len, int flags)`	Decode the Base64-encoded data in input and return the data in a new byte array.
`static byte[]`	`decode(java.lang.String str, int flags)`	Decode the Base64-encoded data in input and return the data in a new byte array.
`static byte[]`	`encode(byte[] input, int flags)`	Base64-encode the given data and return a newly allocated byte[] with the result.
`static byte[]`	`encode(byte[] input, int offset, int len, int flags)`	Base64-encode the given data and return a newly allocated byte[] with the result.
`static java.lang.String`	`encodeToString(byte[] input, int flags)`	Base64-encode the given data and return a newly allocated String with the result.
`static java.lang.String`	`encodeToString(byte[] input, int offset, int len, int flags)`	Base64-encode the given data and return a newly allocated String with the result.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DEFAULT
```
public static final int DEFAULT
```
    Default values for encoder/decoder flags.
    
    See Also:
    
    Constant Field Values
  - NO_PADDING
```
public static final int NO_PADDING
```
    Encoder flag bit to omit the padding '=' characters at the end of the output (if any).
    
    See Also:
    
    Constant Field Values
  - NO_WRAP
```
public static final int NO_WRAP
```
    Encoder flag bit to omit all line terminators (i.e., the output will be on one long line).
    
    See Also:
    
    Constant Field Values
  - CRLF
```
public static final int CRLF
```
    Encoder flag bit to indicate lines should be terminated with a CRLF pair instead of just an LF. Has no effect if NO_WRAP is specified as well.
    
    See Also:
    
    Constant Field Values
  - URL_SAFE
```
public static final int URL_SAFE
```
    Encoder/decoder flag bit to indicate using the "URL and filename safe" variant of Base64 (see RFC 3548 section 4) where - and _ are used in place of + and /.
    
    See Also:
    
    Constant Field Values
  - NO_CLOSE
```
public static final int NO_CLOSE
```
    Flag to pass to indicate that it should not close the output stream it is wrapping when it itself is closed.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - decode
```
public static byte[] decode(java.lang.String str,
                            int flags)
```
    Decode the Base64-encoded data in input and return the data in a new byte array.
    The padding '=' characters at the end are considered optional, but if any are present, there must be the correct number of them.
    
    Parameters:
    
    str - the input String to decode, which is converted to bytes using the default charset
    
    flags - controls certain features of the decoded output. Pass DEFAULT to decode standard Base64.
    
    Returns:
    
    Decode Data
    
    Throws:
    
    java.lang.IllegalArgumentException - if the input contains incorrect padding
  - decode
```
public static byte[] decode(byte[] input,
                            int flags)
```
    Decode the Base64-encoded data in input and return the data in a new byte array.
    The padding '=' characters at the end are considered optional, but if any are present, there must be the correct number of them.
    
    Parameters:
    
    input - the input array to decode
    
    flags - controls certain features of the decoded output. Pass DEFAULT to decode standard Base64.
    
    Returns:
    
    Decode Data
    
    Throws:
    
    java.lang.IllegalArgumentException - if the input contains incorrect padding
  - decode
```
public static byte[] decode(byte[] input,
                            int offset,
                            int len,
                            int flags)
```
    Decode the Base64-encoded data in input and return the data in a new byte array.
    The padding '=' characters at the end are considered optional, but if any are present, there must be the correct number of them.
    
    Parameters:
    
    input - the data to decode
    
    offset - the position within the input array at which to start
    
    len - the number of bytes of input to decode
    
    flags - controls certain features of the decoded output. Pass DEFAULT to decode standard Base64.
    
    Returns:
    
    Decode Data
    
    Throws:
    
    java.lang.IllegalArgumentException - if the input contains incorrect padding
  - encodeToString
```
public static java.lang.String encodeToString(byte[] input,
                                              int flags)
```
    Base64-encode the given data and return a newly allocated String with the result.
    
    Parameters:
    
    input - the data to encode
    
    flags - controls certain features of the encoded output. Passing DEFAULT results in output that adheres to RFC 2045.
    
    Returns:
    
    Decode Data
  - encodeToString
```
public static java.lang.String encodeToString(byte[] input,
                                              int offset,
                                              int len,
                                              int flags)
```
    Base64-encode the given data and return a newly allocated String with the result.
    
    Parameters:
    
    input - the data to encode
    
    offset - the position within the input array at which to start
    
    len - the number of bytes of input to encode
    
    flags - controls certain features of the encoded output. Passing DEFAULT results in output that adheres to RFC 2045.
    
    Returns:
    
    Decode Data
  - encode
```
public static byte[] encode(byte[] input,
                            int flags)
```
    Base64-encode the given data and return a newly allocated byte[] with the result.
    
    Parameters:
    
    input - the data to encode
    
    flags - controls certain features of the encoded output. Passing DEFAULT results in output that adheres to RFC 2045.
    
    Returns:
    
    Decode Data
  - encode
```
public static byte[] encode(byte[] input,
                            int offset,
                            int len,
                            int flags)
```
    Base64-encode the given data and return a newly allocated byte[] with the result.
    
    Parameters:
    
    input - the data to encode
    
    offset - the position within the input array at which to start
    
    len - the number of bytes of input to encode
    
    flags - controls certain features of the encoded output. Passing DEFAULT results in output that adheres to RFC 2045.
    
    Returns:
    
    Decode Data

Class Base64

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT

NO_PADDING

NO_WRAP

CRLF

URL_SAFE

NO_CLOSE

Method Detail

decode

decode

decode

encodeToString

encodeToString

encode

encode