code: public static float[] splitFloat(String str) {
          String[] ss = Strings.splitIgnoreBlank(str);
          if (null == ss)
              return null;
          float[] ns = new float[ss.length];
          for (int i = 0; i < ns.length; i++) {
              try {
                  ns[i] = Float.parseFloat(ss[i]);
              }
              catch (NumberFormatException e) {
                  ns[i] = 0.0f;
              }
          }
          return ns;
      }
docs: 将一个字符串变成一个浮点数数组，如果字符串不符合规则，对应的元素为 0.0 <br>
  比如：
  
  <pre>
  "3,4,9"     =>  [ 3.0f, 4.0f, 9.0f ]
  "a,9.8,100" =>  [ 0.0f, 9.0f, 100.0f ]
  </pre>
  
  @param str
  半角逗号分隔的数字字符串
  @return 数组