将中文转换成unicode代码,Java代码库,德仔网

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【Java】将中文转换成unicode
作者:Dezai.CN / 发布于2012/3/6/ 530
<div>/**</div>
<div>* CharacterSetToolkit.java</div>
<div>*</div>
<div>* Created on 2007年5月17日, 上午11:04</div>
<div>*</div>
<div>* To change this template, choose Tools | Template Manager</div>
<div>* and open the template in the editor.</div>
<div>*/</div>
<div></div>
<div>package mobi.chenwei.util;</div>
<div></div>
<div>/**</div>
<div>* 进行字符操作的工具类。</div>
<div>* @author ChenWei</div>
<div>* @website www.chenwei.mobi</div>
<div>* @email chenweionline@hotmail.com</div>
<div>*/</div>
<div>public class CharacterSetToolkit {</div>
<div> </div>
<div>  /** Creates a new instance of CharacterSetToolkit */</div>
<div>  public CharacterSetToolkit() {</div>
<div>  }
<div> </div>
<div>  private static final char[] hexDigit = {</div>
<div>    '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'</div>
<div>  };</div>
<div> </div>
<div>  private static char toHex(int nibble) {</div>
<div>    return hexDigit[(nibble & 0xF)];</div>
<div>  }
<div> </div>
<div>  /**</div>
<div>  * 将字符串编码成 Unicode 。</div>
<div>  * @param theString 待转换成Unicode编码的字符串。</div>
<div>  * @param escapeSpace 是否忽略空格。</div>
<div>  * @return 返回转换后Unicode编码的字符串。</div>
<div>  */</div>
<div>  public static String toUnicode(String theString, boolean escapeSpace) {</div>
<div>    int len = theString.length();</div>
<div>    int bufLen = len * 2;</div>
<div>    if (bufLen < 0) {</div>
<div>      bufLen = Integer.MAX_VALUE;</div>
<div>    }
<div>    StringBuffer outBuffer = new StringBuffer(bufLen);</div>
<div>   </div>
<div>    for(int x=0; x<len; x++) {</div>
<div>      char aChar = theString.charAt(x);</div>
<div>      // Handle common case first, selecting largest block that</div>
<div>      // avoids the specials below</div>
<div>      if ((aChar > 61) && (aChar < 127)) {</div>
<div>        if (aChar == '\\') {</div>
<div>          outBuffer.append('\\'); outBuffer.append('\\');</div>
<div>          continue;</div>
<div>        }
<div>        outBuffer.append(aChar);</div>
<div>        continue;</div>
<div>      }
<div>      switch(aChar) {</div>
<div>        case ' ':</div>
<div>          if (x == 0 || escapeSpace)</div>
<div>            outBuffer.append('\\');</div>
<div>          outBuffer.append(' ');</div>
<div>          break;</div>
<div>        case '\t':outBuffer.append('\\'); outBuffer.append('t');</div>
<div>        break;</div>
<div>        case '\n':outBuffer.append('\\'); outBuffer.append('n');</div>
<div>        break;</div>
<div>        case '\r':outBuffer.append('\\'); outBuffer.append('r');</div>
<div>        break;</div>
<div>        case '\f':outBuffer.append('\\'); outBuffer.append('f');</div>
<div>        break;</div>
<div>        case '=': // Fall through</div>
<div>        case ':': // Fall through</div>
<div>        case '#': // Fall through</div>
<div>        case '!':</div>
<div>          outBuffer.append('\\'); outBuffer.append(aChar);</div>
<div>          break;</div>
<div>        default:</div>
<div>          if ((aChar < 0x0020) || (aChar > 0x007e)) {</div>
<div>            outBuffer.append('\\');</div>
<div>            outBuffer.append('u');</div>
<div>            outBuffer.append(toHex((aChar >> 12) & 0xF));</div>
<div>            outBuffer.append(toHex((aChar >> 8) & 0xF));</div>
<div>            outBuffer.append(toHex((aChar >> 4) & 0xF));</div>
<div>            outBuffer.append(toHex( aChar    & 0xF));</div>
<div>          } else {</div>
<div>            outBuffer.append(aChar);</div>
<div>          }
<div>      }
<div>    }
<div>    return outBuffer.toString();</div>
<div>  }
<div> </div>
<div>  /**</div>
<div>  * 从 Unicode 码转换成编码前的特殊字符串。</div>
<div>  * @param in Unicode编码的字符数组。</div>
<div>  * @param off 转换的起始偏移量。</div>
<div>  * @param len 转换的字符长度。</div>
<div>  * @param convtBuf 转换的缓存字符数组。</div>
<div>  * @return 完成转换，返回编码前的特殊字符串。</div>
<div>  */</div>
<div>  public String fromUnicode(char[] in, int off, int len, char[] convtBuf) {</div>
<div>    if (convtBuf.length < len) {</div>
<div>      int newLen = len * 2;</div>
<div>      if (newLen < 0) {</div>
<div>        newLen = Integer.MAX_VALUE;</div>
<div>      }
<div>      convtBuf = new char[newLen];</div>
<div>    }
<div>    char aChar;</div>
<div>    char[] out = convtBuf;</div>
<div>    int outLen = 0;</div>
<div>    int end = off + len;</div>
<div>   </div>
<div>    while (off < end) {</div>
<div>      aChar = in[off++];</div>
<div>      if (aChar == '\\') {</div>
<div>        aChar = in[off++];</div>
<div>        if (aChar == 'u') {</div>
<div>          // Read the xxxx</div>
<div>          int value = 0;</div>
<div>          for (int i = 0; i < 4; i++) {</div>
<div>            aChar = in[off++];</div>
<div>            switch (aChar) {</div>
<div>              case '0':</div>
<div>              case '1':</div>
<div>              case '2':</div>
<div>              case '3':</div>
<div>              case '4':</div>
<div>              case '5':</div>
<div>              case '6':</div>
<div>              case '7':</div>
<div>              case '8':</div>
<div>              case '9':</div>
<div>                value = (value << 4) + aChar - '0';</div>
<div>                break;</div>
<div>              case 'a':</div>
<div>              case 'b':</div>
<div>              case 'c':</div>
<div>              case 'd':</div>
<div>              case 'e':</div>
<div>              case 'f':</div>
<div>                value = (value << 4) + 10 + aChar - 'a';</div>
<div>                break;</div>
<div>              case 'A':</div>
<div>              case 'B':</div>
<div>              case 'C':</div>
<div>              case 'D':</div>
<div>              case 'E':</div>
<div>              case 'F':</div>
<div>                value = (value << 4) + 10 + aChar - 'A';</div>
<div>                break;</div>
<div>              default:</div>
<div>                throw new IllegalArgumentException(</div>
<div>                    "Malformed \\uxxxx encoding.");</div>
<div>            }
<div>          }
<div>          out[outLen++] = (char) value;</div>
<div>        } else {</div>
<div>          if (aChar == 't') {</div>
<div>            aChar = '\t';</div>
<div>          } else if (aChar == 'r') {</div>
<div>            aChar = '\r';</div>
<div>          } else if (aChar == 'n') {</div>
<div>            aChar = '\n';</div>
<div>          } else if (aChar == 'f') {</div>
<div>            aChar = '\f';</div>
<div>          }
<div>          out[outLen++] = aChar;</div>
<div>        }
<div>      } else {</div>
<div>        out[outLen++] = (char) aChar;</div>
<div>      }
<div>    }
<div>    return new String(out, 0, outLen);</div>
<div>  }
<div>}
<div></div>
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