com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type

com.fasterxml.jackson.databind.exc.MismatchedInputException是Jackson库中的一个异常，它表示无法将输入的值反序列化为指定的类型。这通常发生在输入数据与目标类型不匹配的情况下。

以下是一个演示如何处理com.fasterxml.jackson.databind.exc.MismatchedInputException异常的例子：

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.exc.MismatchedInputException;

public class Main {
    public static void main(String[] args) {
        String json = "{\"name\":\"John\", \"age\":30}";

        try {
            ObjectMapper objectMapper = new ObjectMapper();
            Car car = objectMapper.readValue(json, Car.class);
            System.out.println(car);
        } catch (MismatchedInputException e) {
            System.out.println("Cannot deserialize value of type: " + e.getTargetType());
        } catch (Exception e) {
            System.out.println("An error occurred: " + e.getMessage());
        }
    }
}

class Car {
    private String name;
    private int age;

    // getters and setters

    @Override
    public String toString() {
        return "Car{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

在上面的例子中，我们尝试将一个JSON字符串反序列化为Car对象。如果JSON字符串中的属性与Car类的属性不匹配，就会抛出com.fasterxml.jackson.databind.exc.MismatchedInputException异常。在catch块中，我们捕获该异常并打印出目标类型。