java中使用String提取字符串中的数字（整数、负数、double）类型小数点数字

淩亂°似流年 2022-07-13 03:23 355阅读 0赞

//提取固定格式字符串中的数字，整数、double、负数都可以
    public static String[] extractAmountMsg(String ptCasinoMsg){
        String returnAmounts [] = new String [4];
        if(!ptCasinoMsg.equals("")){
            ptCasinoMsg = ptCasinoMsg.replace(" | ", " ");
            String [] amounts = ptCasinoMsg.split(" ");
            for(int i=0;i<amounts.length;i++){
                String msgAmount = amounts[i];
                String numFlag = "";
                if(msgAmount.contains("-")){
                    numFlag="-";
                }
                Pattern p=Pattern.compile("(\\d+\\.\\d+)");
                Matcher m=p.matcher(amounts[i]);
                if(m.find()){
                    returnAmounts[i]=m.group(1)==null?"":numFlag+m.group(1);
                }else{
                    p=Pattern.compile("(\\d+)");
                    m=p.matcher(amounts[i]);
                    if(m.find()){
                        returnAmounts[i]=m.group(1)==null?"":numFlag+m.group(1);
                    }
                }
            }
        }else {
            returnAmounts[0]="0";
            returnAmounts[1]="0d";
            returnAmounts[2]="0d";
            returnAmounts[3]="0d";
        }
    
        return returnAmounts;
    }

@Test
    public void testNum(){
        String[] cc = NumberUtil.extractAmountMsg("日单量：100 | 交易额度：55.6 | 总额度：55.7 | 优惠额：-33.4");
    
        for (String s :cc){
            System.out.println(s);
        }
    
    }