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apache-comnons系列之commons-codec1.11 学习笔记

概述

• Base64
  
  • Provides Base64 encoding and decoding as defined by
    
    RFC 2045
    
    .
• DigestUtils
  
  • Operations to simplify common {@link java.security.MessageDigest} tasks.
  • This class is immutable and thread-safe.
  • However the MessageDigest instances it creates generally won’t be.
• MessageDigestAlgorithms
  
  • Standard {@link MessageDigest} algorithm names from the
    
    Java Cryptography Architecture Standard Algorithm Name Documentation
    
    .
• URLCodec
  
  • Implements the ‘www-form-urlencoded’ encoding scheme, also misleadingly known as URL encoding.
  • This class is thread-safe since 1.11
• Encoder
  
  • Provides the highest level of abstraction for Encoders
• Decoder
  
  • Provides the highest level of abstraction for Decoders

测试

• org.apache.commons.codec.binary.Base64Test
  
  • encodeBase64String
    
    • A-Z/a-z/0-9/-_
    • They are formed by taking a block of 3 octets to form a 24-bit string,which is converted into 4 BASE64 characters.
  • decodeBase64
    
    • Decodes a Base64 String into octets.
• org.apache.commons.codec.digest.DigestUtilsTest
  
  • md5Hex
    
    • Calculates the MD5 digest and returns the value as a 32 character hex string.
  • sha1Hex
    
    • Calculates the SHA-1 digest and returns the value as a hex string.
  • digestAsHex
    
    • Reads through a byte array and returns the digest for the data.
• org.apache.commons.codec.net.URLCodecTest
  
  • ESCAPE_CHAR = ‘%’
  • encode
    
    • Encodes a string into its URL safe form using the specified string charset. Unsafe characters are escaped.
  • decode
    
    • Decodes a URL safe string into its original form using the specified encoding. Escaped characters are converted back to their original representation