Jackson第一个程序

我们创建一个Student类。将创建一个JSON字符串学生的详细信息，并将其反序列化到学生的对象，然后将其序列化到JSON字符串。

public class Student {
    private String name;
    private Integer age;
    public Student(){}
    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 String toString(){
        return "Student [ name: "+name+", age: "+ age+ " ]";
    }
}

public class JacksonTester {
    public static void main(String[] args) {
        //可重复使用的对象
        ObjectMapper mapper = new ObjectMapper();
        String jsonString= "{\"name\":\"Mahesh\", \"age\":21}";
        //map json to student
        try{
            //反序列化JSON到对象,通过JSON字符串和对象类型作为参数JSON来源
            Student student =mapper.readValue(jsonString,Student.class);
            System.out.println(student);

            mapper.enable(SerializationConfig.Feature.INDENT_OUTPUT);
            //使用writeValueAsString()方法来获取对象的JSON字符串表示
            jsonString = mapper.writeValueAsString(student);
            System.out.println(jsonString);

        }catch (JsonParseException e){
            e.printStackTrace();
        }catch (JsonMappingException e){
            e.printStackTrace();
        }catch (IOException e){
            e.printStackTrace();
        }
    }
}

结果:
"C:\Program Files\Java\jdk1.8.0_191\bin\java.exe" ...
Student [ name: Mahesh, age: 21 ]
{
  "name" : "Mahesh",
  "age" : 21
}

Process finished with exit code 0