Java发送及解析多层嵌套JSON

传入多层嵌套JSON

public static void main(String[] args) throws Exception {
   
   
		//最外层
		HashMap<String, Object> map = new HashMap<>();
		
		HashMap<String, Object> a = new HashMap<>();
		HashMap<String, Object> b = new HashMap<>();
		HashMap<String, Object> c1 = new HashMap<>();
		HashMap<String, Object> c2 = new HashMap<>();
		
		a.put("a1", "101");
		a.put("a2", "102");
		
		b.put("b1", "201");
		b.put("b2", "202");
		
		c1