J2SE综合－关于字符串的一些处理技巧

 * @版本 1.0
 */
public class StringUtil {
  public StringUtil() {
  }

  /**
   * @description 字符串替代函数
   * @param source String 源字符串
   * @param be_rep_str String 需要被替换的子串
   * @param rep_str String 要替换的目标串
   * @param return_str String
   * @return String
   */
  public static String replaceStr(String source, String be_rep_str,
                                  String rep_str, String return_str) {
    if (source.indexOf(be_rep_str) < 0) {
      return source;
    }
    else {
      String head = source.substring(0, source.indexOf(be_rep_str));
      String body = rep_str +
          source.substring(source.indexOf(be_rep_str) + be_rep_str.length());
      return_str = replaceStr(head + body, be_rep_str, rep_str,
                              return_str);
    }
    return return_str;
  }

  public static String[] getFields(String test, String sep) { //坼分字符,将字句test按照sep进行坼分。
    sep = "\u0020";
    if (test.indexOf(sep) != -1) {
      if ( (test.indexOf(sep) > test.indexOf("#")) &&
          test.indexOf("#") != -1) {
        sep = "#";
      }
    }
    else {
      sep = "#";
    }
    String[] st;
    List flds = new ArrayList();
    if (sep.equals("\u0020")) {
      StringTokenizer stto = new StringTokenizer(test.trim(), sep);
      while (stto.hasMoreTokens()) {
        flds.add(stto.nextToken());
      }
      st = (String[]) flds.toArray(new String[stto.countTokens()]);
    }
    else {
      st = test.trim().split(sep);
    }
    return st;
  }

//    public String DBC2SBC(String str)
//    {
//        int i ;
//        String result = "";
//        for (i = 0 ; i < str.length(); i++)
//        {
//            code = str.charCodeAt(i) ;
//            // “65281”是“！”，“65373”是“｝”
//            if (code >= 65281 && code < 65373)
//                //  “65248”是转换码距
//                result += String.fromCharCode(str.charCodeAt(i) - 65248) ;
//            else
//                result += str.charAt(i) ;
//        }
//        return result ;
//    }

  /**
   * 半角 DBC case -> 全角 SBC case
   * @param QJstr String
   * @return String
   */
  public static final String BQchange(String QJstr) {
    String outStr = "";
    String Tstr = "";
    byte[] b = null;

    for (int i = 0; i < QJstr.length(); i++) {
      try {
        Tstr = QJstr.substring(i, i + 1);
        b = Tstr.getBytes("unicode");
      }
      catch (java.io.UnsupportedEncodingException e) {
        e.printStackTrace();
      }
      if (b[3] != -1) {
        b[2] = (byte) (b[2] - 32);
        b[3] = -1;
        try {
          outStr = outStr + new String(b, "unicode");
        }
        catch (java.io.UnsupportedEncodingException e) {
          e.printStackTrace();
        }
      }
      else {
        outStr = outStr + Tstr;
      }
    }
    return outStr;
  }

  /**
   * 全角 转换成 -> 半角
   * @param QJstr String
   * @return String
   */
  public static final String QBchange(String QJstr) {
    String outStr = "";
    String Tstr = "";
    byte[] b = null;

    for (int i = 0; i < QJstr.length(); i++) {
      try {
        Tstr = QJstr.substring(i, i + 1);
        b = Tstr.getBytes("unicode");
      }
      catch (java.io.UnsupportedEncodingException e) {
        e.printStackTrace();
      }
      if (b[3] == -1) {
        b[2] = (byte) (b[2] + 32);
        b[3] = 0;
        try {
          outStr = outStr + new String(b, "unicode");
        }
        catch (java.io.UnsupportedEncodingException e) {
          e.printStackTrace();
        }
      }
      else {
        outStr = outStr + Tstr;
      }
    }
    return outStr;
  }

  public static void main(String aa[]) {
    String qj = "＃?￥％……?＊（）";
    String bj = "#@$%^&*()";
    System.out.println("半角转换成全角：" + bj + "  -->  " + BQchange(bj));
    String s = " ";
    String qs = "　";
    System.out.println("全角转换成半角："+qj + " -->" + QBchange(qj));
    System.out.println( (int) (QBchange(qs).toCharArray()[0]));
    System.out.println( (int) s.toCharArray()[0]);
    String dd[] = getFields("23#99#99#99", "#");
    for (int i = 0; i < dd.length; i++) {
      System.out.println("asfd" + dd[i]);
    }
    System.out.println(dd.length);
  }
}