Jackson使用

如何使用 Jackson

学习任何一个技术，它是什么，怎么用，为什么？

这篇文档主要简单讲述如何使用 Jackson 进行序列化以及反序列化

如果需要快速的进行序列化或者反序列化，请用ctrl +F 进行搜索关键字。

Maven

• 在这里要说一下，Springboot中本身就依赖于Jackson，详情：https://www.bilibili.com/video/BV1kj411R7Wx?t=1.3
• note： 在这里还是把maven地址贴出来，但这三个依赖的版本一定要统一，当初笔者用时，databind版本比其他两个包高一级，在序列化和反序列化时都会出现失败。

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.14.2</version>
        </dependency>
        <!--对LocalDateTime等jdk8时间日期api的转化支持-->
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
            <version>2.14.2</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.14.2</version>
        </dependency>
  		 <!--对数据进行XML序列化和反序列化-->
         <dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-xml</artifactId>
        </dependency>

代码展示

测试类

 
/**
 * <P>
 *     Jackson测试类,添加了各种数据类型,以便于测试序列化和反序列化
 * </P>
 * @author unknown
 * @since 2023/07/31 15:43
 */
@Data
public class Test {
 
    private long longId;
 
    private String stringTest;
 
    private int intTest;
 
    private double doubleTest;
 
    private short shortTest;
 
    private byte byteTest;
 
    private char charTest;
 
    private List<String> listStringTest;
 
    /**
     * 以下注解都是用于XML格式的序列化和反序列化,删除不影响JSON格式的序列化和反序列化
     * 在javaTimeModule中自定义过相关类型的JOSN格式序列化和反序列化
     */
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
    @JsonSerialize(using = LocalDateTimeSerializer.class)
    @JsonDeserialize(using = LocalDateTimeDeserializer.class)
    private LocalDateTime localDateTimeTest;
 
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private Date dateTest;
}
 
 

测试代码

/**
 * @author unknown <P>
 * @since 2023/07/31 03:38 <P>
 * Jackson还支持CBOR,MessagePack,YAML等格式的序列化和反序列化,笔者暂时没有这个需求,所有不在此demo内举例
 */
 
 
public class JsonTest {
 
 
    private static final String DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
 
    private static final ObjectMapper objectMapper = new ObjectMapper();
 
    private static final XmlMapper xmlMapper = new XmlMapper();
 
    static {
 
        // 自定义序列化对象
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        // LocalDateTime 序列化
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DATE_TIME_FORMAT)));
        // LocalDateTime 反序列化
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DATE_TIME_FORMAT)));
 
        /**
         * 将在<P>globalConfigurationTest()</P>中诠释
         */
        // 字段自动匹配,以对象字段为标准,JSON串种多余的字段舍弃
        objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
        // 序列化后不包含null的字段
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        /*
        // 将对象字段的驼峰转下划线
        objectMapper.setPropertyNamingStrategy(PropertyNamingStrategies.SNAKE_CASE);
        // 将对象字段的驼峰转下划线且全部字段转为大写
        objectMapper.setPropertyNamingStrategy(PropertyNamingStrategies.UPPER_SNAKE_CASE);*/
 
 
        /**
         * <P>序列化美化输出</P>
         * 此美化输出的作用体现于<P>每个字段占据一行</P>,类似在其他Json格式化网站一样的功能,方便阅读,生产线上不推荐此功能
         */
        objectMapper.configure(SerializationFeature.INDENT_OUTPUT, true);
 
        // 注册自定义序列化对象
        objectMapper.registerModule(javaTimeModule);
 
    }
 
    /**
     * <P>配置代码解释</P>
     * Note: 在开启以下两个配置后,反序列化将会失效,待琢磨
     * <p>
     * 将对象字段的驼峰转下划线<P>
     * objectMapper.setPropertyNamingStrategy(PropertyNamingStrategies.SNAKE_CASE);
     * <p>
     * 将对象字段的驼峰转下划线且字段大写<P>
     * objectMapper.setPropertyNamingStrategy(PropertyNamingStrategies.UPPER_SNAKE_CASE);
     *
     * 相对于这种配置,最好是用在JavaBean上,因为大部分序列化都是正常格式,有部分特殊的对象可能需要字段格式转换
     * @see  com.example.blog.jacksontest.JacksonAnnotationEntityTest
     */
    @Test
    public void globalConfigurationTest() throws JsonProcessingException {
        com.example.blog.jacksontest.Test test = new com.example.blog.jacksontest.Test();
        test.setLongId(1L);
//        test.setStringTest(DATE_TIME_FORMAT);
        test.setIntTest(2);
        test.setDoubleTest(3.0);
        test.setShortTest((short) 44);
        test.setByteTest((byte) 1128);
//        test.setCharTest('A');
        test.setLocalDateTimeTest(LocalDateTime.now());
        test.setDateTest(new Date());
 
        String string = objectMapper.writeValueAsString(test);
        /**
         *  将对象字段的驼峰转下划线且全部字段转为大写
         *  objectMapper.setPropertyNamingStrategy(PropertyNamingStrategies.UPPER_SNAKE_CASE);
         * {
         *   "LONG_ID" : 1,
         *   // String类型的字段注释掉,将不会序列化此字段 -> objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
         *   "INT_TEST" : 2,
         *   "DOUBLE_TEST" : 3.0,
         *   "SHORT_TEST" : 44,
         *   "BYTE_TEST" : 104,
         *   "CHAR_TEST" : "\u0000", char类型的字段也不注释掉,但此字段在java中有默认值
         *   "LOCAL_DATE_TIME_TEST" : "2023-08-01 03:17:23",
         *   "DATE_TEST" : "2023-07-31 19:17:23"
         * }
         */
        System.out.println(string);
 
        // 添加多余字段Test测试-> objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
        String deserialized = "{\"Test\":1,\"longId\":1,\"stringTest\":\"yyyy-MM-dd HH:mm:ss\",\"intTest\":2," +
                "\"doubleTest\":3.0,\"shortTest\":-32768,\"byteTest\":104,\"charTest\":\"A\"," +
                "\"localDateTimeTest\":\"2023-08-31 22:26:43\",\"dateTest\":\"2023-07-31 14:26:43\"}";
        com.example.blog.jacksontest.Test deserializedTest = objectMapper.readValue(deserialized, com.example.blog.jacksontest.Test.class);
        /**
         * 多余的字段Test已被自动舍弃
         * Test(longId=1, stringTest=yyyy-MM-dd HH:mm:ss, intTest=2, doubleTest=3.0, shortTest=-32768, byteTest=104,
         * charTest=A, localDateTimeTest=2023-08-31T22:26:43, dateTest=Mon Jul 31 22:26:43 CST 2023)
         */
        System.out.println(deserializedTest);
 
    }
 
    /**
     * <P>JavaBean序列化JSON串</P>
     *
     * <p>LocalDateTime<p>
     * 当对象序列化的时候,需要自定义JavaTimeModule的LocalDateTime格式并且注册JavaTimeModule:
     * JavaTimeModule javaTimeModule = new JavaTimeModule();
     * javaTimeModule.addSerializer(LocalDateTime.class,new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DATE_TIME_FORMAT)));
     * objectMapper.registerModule(javaTimeModule);
     *
     * <p>Date</p>
     * 此属性序列化于反序列化时,需要在此对象字段加上@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss"),不推荐在JavaTimeModule中定义
     * 因为SimpleDateFormat是线程不安全的,但是ObjectMapper对象是现场安全的,这样会导致ObjectMapper也是不安全的,错误的如下
     * SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
     * objectMapper.setDateFormat(dateFormat);
     */
    @Test
    public void javaBeanSerialize() throws JsonProcessingException {
 
        com.example.blog.jacksontest.Test test = new com.example.blog.jacksontest.Test();
        test.setLongId(1L);
        test.setStringTest(DATE_TIME_FORMAT);
        test.setIntTest(2);
        test.setDoubleTest(3.0);
        test.setShortTest((short) 44);
        test.setByteTest((byte) 1128);
        test.setCharTest('A');
        ArrayList<String> arrayList = new ArrayList<>();
        arrayList.add("hello");
        arrayList.add("world");
        test.setListStringTest(arrayList);
        test.setLocalDateTimeTest(LocalDateTime.now());
        test.setDateTest(new Date());
 
        String string = objectMapper.writeValueAsString(test);
        System.out.println(string);
    }
 
    /**
     * <P>JavaBean转文件</P>
     */
    @Test
    public void javaBeanToFile() throws IOException {
 
        com.example.blog.jacksontest.Test test = new com.example.blog.jacksontest.Test();
        test.setLongId(1L);
        test.setStringTest(DATE_TIME_FORMAT);
        test.setIntTest(2);
        test.setDoubleTest(3.0);
        test.setShortTest((short) 44);
        test.setByteTest((byte) 1128);
        test.setCharTest('A');
        test.setLocalDateTimeTest(LocalDateTime.now());
        test.setDateTest(new Date());
 
        //写到文件
        objectMapper.writeValue(new File("src/main/resources/static/json.txt"), test);
        //从文件中读取
        com.example.blog.jacksontest.Test read = objectMapper.readValue(new File("/json.txt"), com.example.blog.jacksontest.Test.class);
        System.out.println(read);
    }
 
 
    /**
     * <P>javaBean转字节流</P>
     */
    @Test
    public void javaBeanToByte() throws IOException {
 
        com.example.blog.jacksontest.Test test = new com.example.blog.jacksontest.Test();
        test.setLongId(1L);
        test.setStringTest(DATE_TIME_FORMAT);
        test.setIntTest(2);
        test.setDoubleTest(3.0);
        test.setShortTest((short) 44);
        test.setByteTest((byte) 1128);
        test.setCharTest('A');
        test.setLocalDateTimeTest(LocalDateTime.now());
        test.setDateTest(new Date());
 
        // 写为字节流
        byte[] bytes = objectMapper.writeValueAsBytes(test);
        // 从字节流读取
        com.example.blog.jacksontest.Test read = objectMapper.readValue(bytes, com.example.blog.jacksontest.Test.class);
        System.out.println(read);
    }
 
    /**
     * <P>JavaBean序列化XML</P>
     * 在序列化XML时,遇到了一个问题,也是Java8中LocalDateTime的问题,最后的解决办法是在字段上加上注解组局序列化
     * @see com.example.blog.jacksontest.Test
     * 查过了一些资料,Springboot中没有xmlMapper的依赖,而且不可以用xmlMapper注册JacksonXmlModule对象
     * @see JacksonXmlModule
     * 根据以上信息,大胆猜测需要在Springboot中配置XmlMapper的JavaBean,待实验
     */
    @Test
    public void javaBeanToXML() throws JsonProcessingException {
 
        com.example.blog.jacksontest.Test test = new com.example.blog.jacksontest.Test();
        test.setLongId(1L);
        test.setStringTest(DATE_TIME_FORMAT);
        test.setIntTest(2);
        test.setDoubleTest(3.0);
        test.setShortTest((short) 44);
        test.setByteTest((byte) 1128);
        test.setCharTest('A');
        ArrayList<String> arrayList = new ArrayList<>();
        arrayList.add("hello");
        arrayList.add("world");
        test.setListStringTest(arrayList);
        test.setLocalDateTimeTest(LocalDateTime.now());
        test.setDateTest(new Date());
 
        JacksonXmlModule jacksonXmlModule = new JacksonXmlModule();
        jacksonXmlModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DATE_TIME_FORMAT)));
        jacksonXmlModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DATE_TIME_FORMAT)));
        xmlMapper.registerModule(jacksonXmlModule);
 
        String string = xmlMapper.writeValueAsString(test);
        System.out.println(string);
 
    }
 
    /**
     * <P>XML反序列化JavaBean</P>
     * 在反序列化XML时,遇到了一个问题,也是Java8中LocalDateTime的问题,最后的解决办法是在字段上加上注解组局序列化
     * @see com.example.blog.jacksontest.Test
     * 查过了一些资料,Springboot中没有xmlMapper的依赖,而且不可以用xmlMapper注册JacksonXmlModule对象
     * @see JacksonXmlModule
     * 根据以上信息,大胆猜测需要在Springboot中配置XmlMapper的JavaBean,待实验
     */
    @Test
    public void xmlToJavaBean() throws JsonProcessingException {
 
        String xml = "<Test><longId>1</longId><stringTest>yyyy-MM-dd HH:mm:ss</stringTest><intTest>2</intTest>" +
                "<doubleTest>3.0</doubleTest><shortTest>44</shortTest><byteTest>104</byteTest><charTest>A</charTest>" +
                "<listStringTest><listStringTest>hello</listStringTest><listStringTest>world</listStringTest></listStringTest>" +
                "<localDateTimeTest>2023-08-01 23:10:26</localDateTimeTest><dateTest>2023-08-01 15:10:26</dateTest></Test>\n";
        com.example.blog.jacksontest.Test javaBean = JsonTest.xmlMapper.readValue(xml, new TypeReference<com.example.blog.jacksontest.Test>() {
        });
        System.out.println(javaBean);
 
 
        Jackson2ObjectMapperBuilder xmlMapperBuild = new Jackson2ObjectMapperBuilder().createXmlMapper(true);
 
    }
 
    /**
     * <P>JSON串反序列化JavaBean</P>
     *
     * <p>LocalDateTime<p>
     * 当对象序列化的时候,需要自定义JavaTimeModule的LocalDateTime格式并且注册JavaTimeModule:
     * JavaTimeModule javaTimeModule = new JavaTimeModule();
     * javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DATE_TIME_FORMAT)));
     * objectMapper.registerModule(javaTimeModule);
     *
     * <p>LocalDateTimeDate<p>
     * <p>
     * 此属性序列化于反序列化时,需要在此对象字段加上@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss"),不推荐在JavaTimeModule中定义和objectMapper设置
     * 因为SimpleDateFormat是线程不安全的,但是ObjectMapper对象是现场安全的,这样会导致ObjectMapper也是不安全的,错误的如下
     * SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
     * objectMapper.setDateFormat(dateFormat);
     */
    @Test
    public void deserializeToJavaBean() throws JsonProcessingException {
 
        String deserialized = "{\n" +
                "  \"longId\" : 1,\n" +
                "  \"stringTest\" : \"yyyy-MM-dd HH:mm:ss\",\n" +
                "  \"intTest\" : 2,\n" +
                "  \"doubleTest\" : 3.0,\n" +
                "  \"shortTest\" : 44,\n" +
                "  \"byteTest\" : 104,\n" +
                "  \"charTest\" : \"A\",\n" +
                "  \"listStringTest\" : [ \"hello\", \"world\" ],\n" +
                "  \"localDateTimeTest\" : \"2023-08-01 19:24:02\",\n" +
                "  \"dateTest\" : \"2023-08-01 11:24:02\"\n" +
                "}";
 
        com.example.blog.jacksontest.Test deserializeResult = objectMapper.readValue(deserialized, com.example.blog.jacksontest.Test.class);
        System.out.println(deserializeResult);
 
    }
 
    /**
     * <P>JSON串反序列化Map集合</P>
     */
    @Test
    public void deserializeToMap() throws JsonProcessingException {
 
        String serialized = "{\"longId\":1,\"stringTest\":\"yyyy-MM-dd HH:mm:ss\",\"intTest\":2," +
                "\"doubleTest\":3.0,\"shortTest\":-32768,\"byteTest\":104,\"charTest\":\"A\"," +
                "\"localDateTimeTest\":\"2023-08-31 22:26:43\",\"dateTest\":\"2023-07-31 14:26:43\"}";
 
        Map<String, String> map = objectMapper.readValue(serialized, new TypeReference<>() {
        });
 
        System.out.println(map);
    }
 
 
    /**
     * <P>JSON串反序列化List集合</P>
     * 注意: List的JSON串多了个中括号[]
     */
    @Test
    public void deserializeToList() throws JsonProcessingException {
 
        String serialized = "[{\"longId\":1,\"stringTest\":\"yyyy-MM-dd HH:mm:ss\",\"intTest\":2," +
                "\"doubleTest\":3.0,\"shortTest\":-32768,\"byteTest\":104,\"charTest\":\"A\"," +
                "\"localDateTimeTest\":\"2023-08-31 22:26:43\",\"dateTest\":\"2023-07-31 14:26:43\"}]";
 
        List<com.example.blog.jacksontest.Test> tests = objectMapper.readValue(serialized, new TypeReference<List<com.example.blog.jacksontest.Test>>() {
        });
 
        System.out.println(tests);
    }
 
 
    /**
     * <P>JavaBean覆盖更新</P>
     * <p>
     * 对JavaBean字段属性的重写,如果后者有值,则用后者,没有则用前者,
     */
    @Test
    public void javaBeanOverrideTest() throws JsonProcessingException {
 
        com.example.blog.jacksontest.Test Source = new com.example.blog.jacksontest.Test();
        Source.setLongId(1L);
        Source.setStringTest(DATE_TIME_FORMAT);
        Source.setIntTest(1);
        Source.setDoubleTest(1.0);
        Source.setShortTest((short) 1);
        Source.setByteTest((byte) 1);
        Source.setLocalDateTimeTest(LocalDateTime.now());
        Source.setDateTest(new Date());
 
        com.example.blog.jacksontest.Test overrideField = new com.example.blog.jacksontest.Test();
        overrideField.setLongId(2L);
        overrideField.setStringTest(DATE_TIME_FORMAT);
        overrideField.setIntTest(2);
        overrideField.setDoubleTest(2.0);
        overrideField.setShortTest((short) 2);
        overrideField.setByteTest((byte) 2);
        // 新增属性
        overrideField.setCharTest('B');
        overrideField.setLocalDateTimeTest(LocalDateTime.now());
        overrideField.setDateTest(new Date());
 
        com.example.blog.jacksontest.Test test = objectMapper.updateValue(Source, overrideField);
        System.out.println(test);
    }
 
    /**
     * <P>泛型的处理</P>
     */
    @Test
    public void genericTest() throws JsonProcessingException {
 
        com.example.blog.jacksontest.Test test = new com.example.blog.jacksontest.Test();
        test.setLongId(1L);
        test.setStringTest(DATE_TIME_FORMAT);
        test.setIntTest(2);
        test.setDoubleTest(3.0);
        test.setShortTest((short) 32768);
        test.setByteTest((byte) 1128);
        test.setCharTest('A');
        test.setLocalDateTimeTest(LocalDateTime.now());
        test.setDateTest(new Date());
 
        // 数据封装返回类
        Result<com.example.blog.jacksontest.Test> testResult = ResultBuilder.successResult(test);
 
        // 序列化返回结果
        String genericResult = objectMapper.writeValueAsString(testResult);
 
        // 反序列化结果
        Result<com.example.blog.jacksontest.Test> deserializerResult =
                objectMapper.readValue(genericResult, new TypeReference<Result<com.example.blog.jacksontest.Test>>() {
                });
 
        System.out.println("带泛型的反序列化: " + deserializerResult);
 
        com.example.blog.jacksontest.Test data = deserializerResult.getData();
        System.out.println("数据反序列化对象: " + data);
    }
 
 
    /**
     * <P>解析JSON字符串为JSON树模型</P>
     * 当JSON串数据类型比较多内容复杂时,则可使用JSON树模型来灵活的获取所需的字段内容,如下面的JSON串中,我们只需要listStringTest这个数组
     * <p>
     * 在Jackson中提供了get、path、has等方法来获取或判断
     */
    @Test
    public void jsonTreeNode() throws JsonProcessingException {
 
        String jsonString = "{\n" +
                "  \"longId\" : 1,\n" +
                "  \"stringTest\" : \"yyyy-MM-dd HH:mm:ss\",\n" +
                "  \"intTest\" : 2,\n" +
                "  \"doubleTest\" : 3.0,\n" +
                "  \"shortTest\" : 44,\n" +
                "  \"byteTest\" : 104,\n" +
                "  \"charTest\" : \"A\",\n" +
                "  \"listStringTest\" : [ \"hello\", \"world\" ],\n" +
                "  \"localDateTimeTest\" : \"2023-08-01 20:04:35\",\n" +
                "  \"dateTest\" : \"2023-08-01 12:04:35\"\n" +
                "}";
        JsonNode treeNode = objectMapper.readTree(jsonString);
        // 单独获取某个字段
        JsonNode longId = treeNode.path("longId");
        System.out.println(longId);
        // 获取数组内的数据
        JsonNode listStringTest = treeNode.get("listStringTest");
        for (JsonNode jsonNode : listStringTest) {
            System.out.println(jsonNode);
        }
    }
 
    /**
     * <P>jackson注解测试</P>
     * @see com.example.blog.jacksontest.JacksonAnnotationEntityTest
     */
    @Test
    public void jacksonAnnotationTest() throws JsonProcessingException {
 
        JacksonAnnotationEntityTest jacksonAnnotationEntityTest = new JacksonAnnotationEntityTest();
        jacksonAnnotationEntityTest.setLongId(1L);
        jacksonAnnotationEntityTest.setStringTest(DATE_TIME_FORMAT);
        jacksonAnnotationEntityTest.setIntTest(2);
        jacksonAnnotationEntityTest.setDoubleTest(3.0);
        jacksonAnnotationEntityTest.setShortTest((short) 44);
        jacksonAnnotationEntityTest.setByteTest((byte) 1128);
        jacksonAnnotationEntityTest.setCharTest('A');
        ArrayList<String> arrayList = new ArrayList<>();
        arrayList.add("hello");
        arrayList.add("world");
        jacksonAnnotationEntityTest.setBooleanTest(true);
        jacksonAnnotationEntityTest.setListStringTest(arrayList);
        jacksonAnnotationEntityTest.setLocalDateTimeTest(LocalDateTime.now());
        jacksonAnnotationEntityTest.setDateTest(new Date());
 
        String string = objectMapper.writeValueAsString(jacksonAnnotationEntityTest);
        System.out.println(string);
 
    }
 
 
}

注解测试

/**
 * <P>Jackson注解序列化测试</P>
 * @author unknown
 * @since 2023/08/01 03:40
 * 更多注解请参考: https://github.com/FasterXML/jackson-annotations/wiki/Jackson-Annotations
 * <P>
 * JsonIgnoreProperties("Field1","Field2")
 * 多字段在序列化和反序列化时进行忽略,升级版的JsonIgnore
 * <P>
 * JsonIgnoreType
 * 在序列化和反序列化时,会忽略此类型,例如有一个demo类,类中有成员属性JacksonAnnotationEntityTest,
 * 那么在序列化和反序列化demo类时,将不会输出类中有成员属性JacksonAnnotationEntityTest
 * <P>
 * JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
 *
 */
@Data
@JsonIgnoreProperties({"doubleTest","shortTest"})
//@JsonIgnoreType
@JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
public class JacksonAnnotationEntityTest {
 
    private long longId;
 
    /**
     * <P</P>
     * JsonProperty("xxx")
     * 改变序列化后的字段名称,以括号内的名字取代原本字段名称
     */
    @JsonProperty("xxx")
    private String stringTest;
 
    /**
     * <P></P>
     * JsonIgnore
     * 此注解在序列化及反序列化的时候会忽略此字段
     */
    @JsonIgnore
    private int intTest;
 
    private double doubleTest;
 
    private boolean booleanTest;
 
    private short shortTest;
 
    private byte byteTest;
 
    private char charTest;
 
    private List<String> listStringTest;
 
    private LocalDateTime localDateTimeTest;
 
    private Date dateTest;
}