开发笔记:第三方插件将数据转成json

public class TestBean2Json {
private static void javabean2json() {
City city = new City(1,"陕西");
JSONArray jSONArray = JSONArray.fromObject(city);
String jsonJAVA = jSONArray.toString();
System.out.println(jsonJAVA);
//[{"id":1,"name":"陕西"}]
}

MAP：
private static void map2json() {

List cityList = new ArrayList();
cityList.add(new City(1,"西安"));
cityList.add(new City(2,"临潼"));

Map map = new LinkedHashMap();
map.put("total",cityList.size());//表示集合的长度
map.put("rows",cityList);//rows表示集合

JSONArray jSONArray = JSONArray.fromObject(map);
String jsonJAVA = jSONArray.toString();
System.out.println(jsonJAVA);
//[{"total":2,"rows":[{"id":1,"name":"西安"},{"id":2,"name":"临潼"}]}]

jsonJAVA = jsonJAVA.substring(1,jsonJAVA.length()-1);
System.out.println(jsonJAVA);
}

List：
private static void javabeanlist2json() {
List cityList = new ArrayList();
cityList.add(new City(1,"中山"));
cityList.add(new City(2,"佛山"));
Province province = new Province(1,"广东",cityList);

JSONArray jSONArray = JSONArray.fromObject(province);
String jsonJAVA = jSONArray.toString();
System.out.println(jsonJAVA);
/*
[
{
"id":1,
"name":"广东"
"cityList":[{"id":1,"name":"中山"},{"id":2,"name":"佛山"}],
}
]
*/
}

private static void list2json() {
List cityList = new ArrayList();
cityList.add(new City(1,"广州"));
cityList.add(new City(2,"珠海"));
JSONArray jSONArray = JSONArray.fromObject(cityList);
String jsonJAVA = jSONArray.toString();
System.out.println(jsonJAVA);
//[{"id":1,"name":"广州"},{"id":2,"name":"珠海"}]
}

private static void set2json() {
Set citySet = new LinkedHashSet();
citySet.add(new City(1,"广州"));
citySet.add(new City(2,"珠海"));
JSONArray jSONArray = JSONArray.fromObject(citySet);
String jsonJAVA = jSONArray.toString();
System.out.println(jsonJAVA);
//[{"id":1,"name":"广州"},{"id":2,"name":"珠海"}]
}