/**
   * 用指定字符串替换，调用参数:
   * str:      源字符串
   * pattern:  被替换的字符串
   * replace:  指定的字符串
   */
  public static String strReplace(String str,String pattern,String replace) {
      boolean isbeing=true;
      int index;
      String s1="";
      while(str.length()>0&&isbeing) {
        index=str.indexOf(pattern);
        if(index!=-1) {
          if(index==0) {
            s1=s1+replace;
          }else{
            s1=s1+str.substring(0,index)+replace;
          }
        str=str.substring(index+pattern.length());
              }else{
                isbeing=false;
              }
      }
        s1=s1+str;
        return s1;
  }