首先访问12306的进行余票查询,比如我查询 武汉到深圳 时间是 2018-05-22的余票

通过浏览器F12可以看到查询信息的接口是如下:

可以看到接口中传入四个参数,leftTicketDTO.train_date,leftTicketDTO.from_station,leftTicketDTO.to_station,

purpose_codes.代表的意思是出发时间,起始地,目的地,票的类型(默认为成年人)

参数里面的地点用的是字典码,需要我们找到字典,

还是通过浏览器F12查看,来自于一个js(我也是看别人的文章知道的)

可以直接打开看到里面是一串很长的字符串,

1526887430(1).png

接下来就是对这个字符串的处理:

我这里用java的httpclient处理的:

CloseableHttpClient httpClient = HttpClients.createDefault();

URI uri = new URIBuilder()

.setScheme("https")

.setHost("kyfw.12306.cn")

.setPath("otn/resources/js/framework/station_name.js")

.setParameter("station_version", "1.9053")

.build();

System.out.println(uri);

HttpGet httpGet = new HttpGet(uri);

httpGet.setHeader("User-Agent","Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36");

HashMap map = new HashMap<>();

HashMap rev_map = new HashMap<>();

try {

CloseableHttpResponse response = httpClient.execute(httpGet);

HttpEntity entity = response.getEntity();

String mess = EntityUtils.toString(entity);

System.out.println(mess);//内容是全的

String reg = "([\\u4e00-\\u9fa5]+)\\|([A-Z]+)";//正则表达式匹配

Pattern compile = Pattern.compile(reg);

//利用正则把所有匹配到的都存入map集合

while (true) {

Matcher matcher = compile.matcher(mess);

if (matcher.find()) {

//System.out.println(matcher.group());

mess = mess.substring(mess.indexOf(matcher.group())+matcher.group().length());

String[] strings = matcher.group().split("\\|"); //双斜线转义

map.put(strings[1],strings[0]); //地点,地点码

rev_map.put(strings[0],strings[1]); //地点码,地点

}else {

break;

}

}

这里将得到的字典序列化到本地,避免每次使用字典都去查一次.

FileOutputStream out = new FileOutputStream("D:\\station.txt");

ObjectOutputStream oos = new ObjectOutputStream(out);

oos.writeObject(map);

oos.close();

接下来直接直接调用接口就行了,还是用的httpclient

public static List getINfo(String from_station,String to_station,String date) throws URISyntaxException {

CloseableHttpClient httpClient = HttpClients.createDefault();

String from_code = station_name.getCodeByCity(from_station);

String ro_code = station_name.getCodeByCity(to_station);

//uri的构造器

URI uri = new URIBuilder()

.setScheme("https")

.setHost("kyfw.12306.cn")

.setPath("/otn/leftTicket/query")

.setParameter("leftTicketDTO.train_date", date) //2018-05-04

.setParameter("leftTicketDTO.from_station", from_code)

.setParameter("leftTicketDTO.to_station", ro_code)

.setParameter("purpose_codes", "ADULT")

.build();

// HttpGet httpGet = new HttpGet("https://kyfw.12306.cn/otn/leftTicket/query?leftTicketDTO.train_date=2018-05-03&leftTicketDTO.from_station=HKN&leftTicketDTO.to_station=HAN&purpose_codes=ADULT");

System.out.println(uri);

HttpGet httpGet = new HttpGet(uri);

httpGet.setHeader("User-Agent","Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36");

//System.out.println(httpGet.getURI());

List> list = new ArrayList<>();

try {

CloseableHttpResponse response = httpClient.execute(httpGet);

HttpEntity entity = response.getEntity();

//System.out.println(entity);

String message = EntityUtils.toString(entity);

System.out.println(message);

ObjectMapper mapper = new ObjectMapper();

JsonNode node = mapper.readTree(message);

JsonNode result = node.get("data").get("result");

System.out.println(result.get(1));

//直接遍历result

for (int i = 0;i < result.size();i++) {

HashMap map = new LinkedHashMap<>();

String str = String.valueOf(result.get(i));

//System.out.println(str);

String[] strings = str.split("\\|"); //加两个反斜线转义

String train_no = strings[3];

String from_station_code = strings[6];

String from_station_name = station_name.getCityByCode(from_station_code);

String to_station_code = strings[7];

String to_station_name = station_name.getCityByCode(to_station_code);

String start_time = strings[8];

String arrive_time = strings[9];

String first_class_seat = strings[31] ; //一等座

String second_class_seat = strings[30]; //二等座

String soft_sleep = strings[23]; //软卧

String hard_sleep = strings[28]; //硬卧

String hard_seat = strings[29]; //硬座

String no_seat = strings[26]; //无座

map.put("train_no",train_no);

map.put("from_station_name",from_station_name);

map.put("to_station_name",to_station_name);

map.put("start_time",start_time);

map.put("arrive_time",arrive_time);

map.put("first_class_seat",first_class_seat);

map.put("second_class_seat",second_class_seat);

map.put("soft_sleep",soft_sleep);

map.put("hard_sleep",hard_sleep);

map.put("hard_seat",hard_seat);

map.put("no_seat",no_seat);

//System.out.println(map);

list.add(map);

}

System.out.println(list);

System.out.println("-------------------------------------------------");

// System.out.println(getStation("WCN"));

response.close();

httpClient.close();

} catch (IOException e) {

e.printStackTrace();

}

return list;

}

最后处理了下,做了个简单的查询页面:

1526887668(1).png