Jackson 和ObjectMapper

最新推荐文章于 2024-04-30 14:23:54 发布

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最新推荐文章于 2024-04-30 14:23:54 发布

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本文介绍如何使用Jackson库进行JSON数据的序列化和反序列化操作，包括定义POJO类、使用ObjectMapper读取和写入JSON数据。

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        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.10.1</version>
        </dependency>

public static class Person {
        public String name;
        public String address;
        public String mobile;

       @JsonCreator
        public Person(@JsonProperty("name") String name,
                      @JsonProperty("address") String address,
                      @JsonProperty("mobile") String mobile) {
            this.name = name;
            this.address = address;
            this.mobile = mobile;
        }


    }

public static void main(String[] args) throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        String json = "{\"id\": \"0001\", \"name\" : \"Coca Cola\", \"price\": 3}";

        JsonNode jsonNode = (JsonNode) mapper.readValue(json, JsonNode.class);
        System.out.println(jsonNode);

        ObjectMapper objectMapper = new ObjectMapper();

        Person person = new Person("name", "address", "mobile");

       //反序列化一个Json字符串
        System.out.println(objectMapper.writeValueAsString(person));

        //序列化一个Person对象
        Person person2 = objectMapper.readValue(objectMapper.writeValueAsString(person), Person.class);
        System.out.println(person2.address);
    }