static class TempClass{ private String name; private int age; public String getName() {return name;} public void setName(String name) {this.name = name;} public int getAge() {return age;} public void setAge(int age) {this.age = age;} } public static void main(String[] args) { Map<String,List<Test.TempClass>> map = new HashMap<String,List<Test.TempClass>>(); Random random = new Random(); for(int i = 1 ; i < 3 ;i++){ List<Test.TempClass> list = new ArrayList<Test.TempClass>(); for(int j = 1 ; j < 3 ;j++) { TempClass tempClass = new TempClass(); int r = random.nextInt(500); tempClass.name = r +"name"; tempClass.age = r ; list.add(tempClass); } map.put(UUID.randomUUID().toString(),list); } //===============对象转字符串===================================== String jsonString = JSON.toJSONString(map); System.out.println(jsonString); //===============字符串转对象=========================== Map<String,List<?>> mapObj = (HashMap<String,List<?>>)JSON.parSEObject(jsonString,HashMap.class); Map<String,List<TempClass>> mapList = (HashMap<String,List<TempClass>>)JSON.parSEObject(jsonString,HashMap.class); for(Map.Entry<String,List<?>> entry : mapObj.entrySet()){ // 此时entry.getValue()并不具备类型信息,需要再做深层的解析 List<TempClass> list = (List<TempClass>)JSONArray.parseArray(entry.getValue().toString(),TempClass.class); mapList.put(entry.getKey(),list); } }