城市代码列表的接口：
http://mobile.weather.com.cn/js/citylist.xml
打开控制台里，将citylist.xml请求右键”SAVE AS”保存下来，或者直接用下载工具也行
xml文件里几乎包含了所有国家的城市数据，可以将其他国家的数据过滤掉，只留下中国的数据
于是我用Java处理了一下
String[] province = new String[]{"北京","天津","河北","山西","内蒙古","辽宁","吉林","黑龙江","上海","江苏","浙江","安徽","福建","江西","山东","河南","湖北","湖南","广东","广西","海南","重庆","四川","贵州","云南","西藏","陕西","甘肃","青海","宁夏","新疆"};
List<String> provinceList = Arrays.asList(province);
File file = new File("citylist.xml");
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(file);
Element rootElement = document.getRootElement();
Element cElement = rootElement.element("c");
List<Map<String, String>> mapList = new ArrayList<>();
for (Iterator it = cElement.elementIterator(); it.hasNext();) {
Map<String, String> map = new HashMap<>();
Element element = (Element) it.next();
String d1 = element.attribute("d1").getValue();
String d2 = element.attribute("d2").getValue();
String d3 = element.attribute("d3").getValue();
String d4 = element.attribute("d4").getValue();
if (!provinceList.contains(d4)) {
continue;
}
map.put("cityCode", d1);
map.put("cityName", d2);
map.put("cityPinyin", d3);
map.put("province", d4);
mapList.add(map);
}
Gson gson = new Gson();
String s = gson.toJson(mapList);
System.out.println(s);
FileUtils.writeStringToFile(new File("citylist.json"), s, "utf-8");
生成的Json文件
压缩后的：
