摘录工具类代码，解析字符串，拼凑时间String

Posted 2021-03-15 koaler

/**
     * 获取第i个位置上的子串
     *
     * @param string
     * @param i
     * @param str
     * @return
     */
    public static int getIndex(String string, int i, String str) {
        Matcher slashMatcher = Pattern.compile(str).matcher(string);
        int mIdx = 0;
        while (slashMatcher.find()) {
            mIdx++;
            if (mIdx == i) {
                break;
            }
        }
        return slashMatcher.start();
    }

    /**
     * 获取pattern1和pattern2之间的子串
     *
     * @param src
     * @param pattern1
     * @param pattern2
     * @return
     */
    public String getAttribute(String src, String pattern1, String pattern2) {
        String result = null;
        int beginindex = 0;
        int endindex = 0;
        beginindex = src.indexOf(pattern1);
        endindex = src.indexOf(pattern2);
        //这里的9，跟3 两个数字，是根据解析的标签长度制定的，
        result = src.substring(beginindex+8, endindex );
        return result;
    }

    /**
     * 统计子串出现的次数
     *
     * @param str
     * @param sToFind
     * @return
     */
    private int countStr(String str, String sToFind) {
        int num = 0;
        while (str.contains(sToFind)) {
            str = str.substring(str.indexOf(sToFind) + sToFind.length());
            num++;
        }
        return num;
    }

    //根据时间Date获取字符串String格式的数据
    public String getFisrtDayOfMonth(Date date){
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String firstDayOfMonth = sdf.format(date.getTime());
        return firstDayOfMonth;
    }

    //根据String字符串yyyy-MM-dd HH:mm:ss格式数据，拼接成数字字符串
    public String getIdstrs(String time){
        String result = "";
        String[] two = time.split(" ");
        String[] one = two[0].split("-");
        String[] three = two[1].split(":");
        result+=one[0]+one[1]+one[2]+three[0]+three[1]+three[2]+"";
        return result;
    }