使用jackson字符串转jackson对象，使用jackson的get方法获取某个值

假设我们有以下JSON字符串：

{
  "name": "John",
  "age": 30,
  "isMarried": true,
  "hobbies": [
    "reading",
    "swimming"
  ]
}

我们可以使用Jackson将其转换为Java对象：

import com.fasterxml.jackson.databind.ObjectMapper;

public class Main {
  public static void main(String[] args) throws Exception {
    String json = "{\"name\":\"John\",\"age\":30,\"isMarried\":true,\"hobbies\":[\"reading\",\"swimming\"]}";

    ObjectMapper mapper = new ObjectMapper();
    Person person = mapper.readValue(json, Person.class);

    System.out.println(person.getName()); // John
    System.out.println(person.getAge()); // 30
    System.out.println(person.isMarried()); // true
    System.out.println(person.getHobbies()); // [reading, swimming]
  }
}

class Person {
  private String name;
  private int age;
  private boolean isMarried;
  private List<String> hobbies;

  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 boolean isMarried() {
    return isMarried;
  }

  public void setMarried(boolean isMarried) {
    this.isMarried = isMarried;
  }

  public List<String> getHobbies() {
    return hobbies;
  }

  public void setHobbies(List<String> hobbies) {
    this.hobbies = hobbies;
  }
}

在上面的示例中，我们使用ObjectMapper的readValue()方法将JSON字符串转换为Java对象，然后使用该对象的getter方法获取特定的值。例如，我们使用person.getName()获取名称属性的值。