解决Jackson反序列化map,set等复杂类型问题

@Test
  public void test10() throws Exception {
    //准备一下数据
    Map<String, Set<String>> map = new HashMap<>();
    map.put("aaa",new HashSet<String>(){{add("111");add("222");}});
    ObjectMapper om = new ObjectMapper();
    String str01 = om.writeValueAsString(map);
    //System.out.println(str01); // {"aaa":["111","222"]}
    // 正常反序列化，未报错
    Map<String, Set<String>> map01 = om.readValue(str01, Map.class);
    // 取值的时候就会报错了
    Set<String> aaa = map01.get("aaa");
  }

@Test
public void test10() throws Exception {
  //准备一下数据
  Map<String, Set<String>> map = new HashMap<>();
  map.put("aaa",new HashSet<String>(){{add("111");add("222");}});
  ObjectMapper om = new ObjectMapper();
  String str01 = om.writeValueAsString(map);
  //System.out.println(str01); // {"aaa":["111","222"]}
  Map<String, Set<String>> m = om.readValue(str01, new TypeReference<HashMap<String, Set<String>>>() {});
  Set<String> aaa = m.get("aaa");
  System.out.println(aaa instanceof HashSet); // true
}

String jsonString="[{'id':'1'},{'id':'2'}]"; 
ObjectMapper mapper = new ObjectMapper(); 
JavaType javaType = mapper.getTypeFactory().constructParametricType(List.class, Bean.class); 
//如果是Map类型 mapper.getTypeFactory().constructParametricType(HashMap.class,String.class, Bean.class); 
List<Bean> lst = (List<Bean>)mapper.readValue(jsonString, javaType);  

List<AlertProjectInfo> projects = mapper.readValue(subProject, mapper.getTypeFactory().constructCollectionType(List.class, AlertProjectInfo.class));
System.out.println(projects.size());

String jsonString="[{'id':'1'},{'id':'2'}]"; 
ObjectMapper mapper = new ObjectMapper(); 
List<Bean> beanList = mapper.readValue(jsonString, new TypeReference<List<Bean>>() {});