Base64 (ibase4j-common 1.2.5 API)

java.lang.Object
- org.csource.common.Base64

```
public class Base64
extends Object
```
Encode arbitrary binary into printable ASCII using BASE64 encoding. very loosely based on the Base64 Reader by Dr. Mark Thornton Optrak Distribution Software Ltd. http://www.optrak.co.uk and Kevin Kelley's http://www.ruralnet.net/~kelley/java/Base64.java Base64 is a way of encoding 8-bit characters using only ASCII printable characters similar to UUENCODE. UUENCODE includes a filename where BASE64 does not. The spec is described in RFC 2045. Base64 is a scheme where 3 bytes are concatenated, then split to form 4 groups of 6-bits each; and each 6-bits gets translated to an encoded printable ASCII character, via a table lookup. An encoded string is therefore longer than the original by about 1/3. The "=" character is used to pad the end. Base64 is used, among other things, to encode the user:password string in an Authorization: header for HTTP. Don't confuse Base64 with x-www-form-urlencoded which is handled by Java.net.URLEncoder.encode/decode If you don't like this code, there is another implementation at http://www.ruffboy.com/download.htm Sun has an undocumented method called sun.misc.Base64Encoder.encode. You could use hex, simpler to code, but not as compact. If you wanted to encode a giant file, you could do it in large chunks that are even multiples of 3 bytes, except for the last chunk, and append the outputs. To encode a string, rather than binary data java.net.URLEncoder may be better. See printable characters in the Java glossary for a discussion of the differences. version 1.4 2002 February 15 -- correct bugs with uneven line lengths, allow you to configure line separator. now need Base64 object and instance methods. new mailing address. version 1.3 2000 September 12 -- fix problems with estimating output length in encode version 1.2 2000 September 09 -- now handles decode as well. version 1.1 1999 December 04 -- more symmetrical encoding algorithm. more accurate StringBuffer allocation size. version 1.0 1999 December 03 -- posted in comp.lang.java.programmer. Futures Streams or files.

构造器概要

构造器
构造器和说明

Base64()

Base64(char chPlus, char chSplash, char chPad, int lineLength)

Base64(int lineLength)

构造器
构造器和说明
`Base64()`
`Base64(char chPlus, char chSplash, char chPad, int lineLength)`
`Base64(int lineLength)`

方法概要

所有方法静态方法实例方法具体方法
限定符和类型	方法和说明
`byte[]`	`decode(String s)` decode a well-formed complete Base64 string back into an array of bytes.
`byte[]`	`decodeAuto(String s)` decode a well-formed complete Base64 string back into an array of bytes.
`static void`	`display(byte[] b)` debug display array
`String`	`encode(byte[] b)` Encode an arbitrary array of bytes as Base64 printable ASCII.
`void`	`setLineLength(int length)` determines how long the lines are that are generated by encode.
`void`	`setLineSeparator(String lineSeparator)` How lines are separated.
`static void`	`show(byte[] b)` debug display array

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造器详细资料
  - Base64
```
public Base64()
```
  - Base64
```
public Base64(char chPlus,
              char chSplash,
              char chPad,
              int lineLength)
```
  - Base64
```
public Base64(int lineLength)
```
- 方法详细资料
  - encode
```
public String encode(byte[] b)
              throws IOException
```
    Encode an arbitrary array of bytes as Base64 printable ASCII. It will be broken into lines of 72 chars each. The last line is not terminated with a line separator. The output will always have an even multiple of data characters, exclusive of \n. It is padded out with =.
    
    参数:
    
    b - byte[]
    
    返回:
    
    String
    
    抛出:
    
    IOException - if an error occurred
  - decodeAuto
```
public byte[] decodeAuto(String s)
```
    decode a well-formed complete Base64 string back into an array of bytes. It must have an even multiple of 4 data characters (not counting \n), padded out with = as needed.
    
    参数:
    
    s - String
    
    返回:
    
    byte[] byte
  - decode
```
public byte[] decode(String s)
```
    decode a well-formed complete Base64 string back into an array of bytes. It must have an even multiple of 4 data characters (not counting \n), padded out with = as needed.
    
    参数:
    
    s - String
    
    返回:
    
    byte[] byte
  - setLineLength
```
public void setLineLength(int length)
```
    determines how long the lines are that are generated by encode. Ignored by decode.
    
    参数:
    
    length - 0 means no newlines inserted. Must be a multiple of 4.
  - setLineSeparator
```
public void setLineSeparator(String lineSeparator)
```
    How lines are separated. Ignored by decode.
    
    参数:
    
    lineSeparator - may be "" but not null. Usually contains only a combination of chars \n and \r. Could be any chars not in set A-Z a-z 0-9 + /.
  - show
```
public static void show(byte[] b)
```
    debug display array
    
    参数:
    
    b - byte[]
  - display
```
public static void display(byte[] b)
```
    debug display array
    
    参数:
    
    b - byte[]

类 Base64

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

Base64

Base64

Base64

方法详细资料

encode

decodeAuto

decode

setLineLength

setLineSeparator

show

display