<!-- 根據(jù)自己需要引入相關(guān)版本依賴。 -->
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-core</artifactId>
  <version>2.9.10</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.9.10</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-annotations</artifactId>
  <version>2.9.10</version>
</dependency>

private static final ObjectMapper mapper;
public static ObjectMapper getObjectMapper(){
    return this.mapper;
}
static{
    //創(chuàng)建ObjectMapper對象
    mapper = new ObjectMapper()
    //configure方法 配置一些需要的參數(shù)
    // 轉(zhuǎn)換為格式化的json 顯示出來的格式美化
    mapper.enable(SerializationFeature.INDENT_OUTPUT);
   //序列化的時候序列對象的那些屬性  
   //JsonInclude.Include.NON_DEFAULT 屬性為默認(rèn)值不序列化 
   //JsonInclude.Include.ALWAYS      所有屬性
   //JsonInclude.Include.NON_EMPTY   屬性為 空（“”） 或者為 NULL 都不序列化 
   //JsonInclude.Include.NON_NULL    屬性為NULL 不序列化
   mapper.setSerializationInclusion(JsonInclude.Include.ALWAYS);  
    //反序列化時,遇到未知屬性會不會報錯 
    //true - 遇到?jīng)]有的屬性就報錯 false - 沒有的屬性不會管，不會報錯
    mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    //如果是空對象的時候,不拋異常  
    mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);  
    // 忽略 transient 修飾的屬性
    mapper.configure(MapperFeature.PROPAGATE_TRANSIENT_MARKER, true);
    //修改序列化后日期格式
    mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);  
    mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
   //處理不同的時區(qū)偏移格式
   mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
   mapper.registerModule(new JavaTimeModule());
}

ObjectMapper mapper = new ObjectMapper();
String jsonString = "{\"name\":\"Hyl\", \"age\":20}";
//將字符串轉(zhuǎn)換為對象
Student student = mapper.readValue(jsonString, Student.class);
System.out.println(student);
//將對象轉(zhuǎn)換為json字符串
jsonString = mapper.writeValueAsString(student);
System.out.println(jsonString);
結(jié)果：
Student [ name: Hyl, age: 20 ]
{
  "name" : "Hyl",
  "age" : 20
}

//對象轉(zhuǎn)為byte數(shù)組
byte[] byteArr = mapper.writeValueAsBytes(student);
System.out.println(byteArr);
//byte數(shù)組轉(zhuǎn)為對象
Student student= mapper.readValue(byteArr, Student.class);
System.out.println(student);
結(jié)果：
[B@3327bd23
Student [ name: Hyl, age: 20 ]

List<Student> studentList= new ArrayList<>();
studentList.add(new Student("hyl1" ,20 , new Date()));
studentList.add(new Student("hyl2" ,21 , new Date()));
studentList.add(new Student("hyl3" ,22 , new Date()));
studentList.add(new Student("hyl4" ,23 , new Date()));
String jsonStr = mapper.writeValueAsString(studentList);
System.out.println(jsonStr);
List<Student> studentList2 = mapper.readValue(jsonStr, List.class);
System.out.println("字符串轉(zhuǎn)集合：" + studentList2 );
結(jié)果：
[ {
  "name" : "hyl1",
  "age" : 20,
  "sendTime" : 1525164212803
}, {
  "name" : "hyl2",
  "age" : 21,
  "sendTime" : 1525164212803
}, {
  "name" : "hyl3",
  "age" : 22,
  "sendTime" : 1525164212803
}, {
  "name" : "hyl4",
  "age" : 23,
  "sendTime" : 1525164212803
} ]
[{name=hyl1, age=20, sendTime=1525164212803}, {name=hyl2, age=21, sendTime=1525164212803}, {name=hyl3, age=22, sendTime=1525164212803}, {name=hyl4, age=23, sendTime=1525164212803}]

Map<String, Object> testMap = new HashMap<>();
testMap.put("name", "22");
testMap.put("age", 20);
testMap.put("date", new Date());
testMap.put("student", new Student("hyl", 20, new Date()));
String jsonStr = mapper.writeValueAsString(testMap);
System.out.println(jsonStr);
Map<String, Object> testMapDes = mapper.readValue(jsonStr, Map.class);
System.out.println(testMapDes);
結(jié)果：
{
  "date" : 1525164212803,
  "name" : "22",
  "student" : {
    "name" : "hyl",
    "age" : 20,
    "sendTime" : 1525164212803,
    "intList" : null
  },
  "age" : 20
}
{date=1525164212803, name=22, student={name=hyl, age=20, sendTime=1525164212803, intList=null}, age=20}

// 修改時間格式
mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
Student student = new Student ("hyl",21, new Date());
student.setIntList(Arrays.asList(1, 2, 3));
String jsonStr = mapper.writeValueAsString(student);
System.out.println(jsonStr);
結(jié)果：
{
  "name" : "hyl",
  "age" : 21,
  "sendTime" : "2020-07-23 13:14:36",
  "intList" : [ 1, 2, 3 ]
}

var data = "{\"name\":\"Hyl\", \"age\":20}";
var student = eval(data);
console.info(student.name);
console.info(student.age);
結(jié)果：
Hyl
20