什么是TypeReference？
//一个泛型类
@Data
public class Generic<T> {
private String name;
private T info;
}
//一个普通类
@Data
public class Shape {
private Integer hight;
private Integer wight;
}
//测试类
@Test
public void test6() throws IOException {
//创建对象并设置值
Generic<List<Shape>> generic = new Generic<>();
generic.setName("aaa");
Shape shape = new Shape();
shape.setHight(198);
shape.setWight(55);
Shape shape1 = new Shape();
shape1.setHight(200);
shape1.setWight(58);
ArrayList<Shape> list = new ArrayList<>();
list.add(shape);
list.add(shape1);
generic.setInfo(list);
ObjectMapper objectMapper = new ObjectMapper();
//序列化
String string = objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(generic);
System.out.println(string);
//反序列化
//使用TypeReference
Generic o = objectMapper.readValue(string, new TypeReference<Generic<List<Shape>>>() {
});
//不使用TypeReference
// Generic o = (string, );
System.out.println(o);
}