直接上代码吧，简单直接，
第一种，用String.format()
第二种：用Uri构造器
private static String fromDate = "-12-13"; //出发时间（格式：yyyy-mm-dd）private static String fromStation = "GZQ"; //出发站代号private static String toStation = "YCN"; //到达站代号private static String purposeCodes ="ADULT"; //乘客类型（成人:ADULT，学生:0X00）private static String baseUrl = "";private static String publicName = "/otn";private static String leftTicketUrl ="/leftTicket/query"; //"leftTicket/queryT";//注:12306的查询接口经常改变（可能一天一改），其变动的主要规律为：/otn/leftTicket/query[A-Z]，就是最后一个字母做变动。// 因此，如果程序查询出异常，很大可能就是接口改变了，重新抓下查询接口即可。private static String getTicketListUrlFmt = baseUrl + publicName + "%s?" +"leftTicketDTO.train_date=%s&" +"leftTicketDTO.from_station=%s&" +"leftTicketDTO.to_station=%s&" +"purpose_codes=%s";public static void main(String[] args) throws IOException, URISyntaxException {String getTicketListUrl = String.format(getTicketListUrlFmt, leftTicketUrl, fromDate, fromStation, toStation, purposeCodes);System.out.println(getTicketListUrl);//uri的构造器URI uri = new URIBuilder().setScheme("https").setHost("").setPath(publicName+leftTicketUrl).setParameter("leftTicketDTO.train_date", fromDate ).setParameter("leftTicketDTO.from_station", fromStation).setParameter("leftTicketDTO.to_station", toStation).setParameter("purpose_codes", purposeCodes).build();System.out.println(uri.toString());}
执行效果如下图：一模一样：
