使用Jackson实现Map与Bean互转

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在使用 java 开发中，通常需要把 Map 转成 Bean，或把 Bean 转成 Map，这就用的工具类，在此推荐使用import com.fasterxml.jackson.databind.ObjectMapper;包下的ObjectMapper类，比 JsonObject 效率高，下面就列举了几种使用方法。

1. pom.xml

   <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-databind</artifactId>
       <version>2.9.6</version>
       <scope>compile</scope>
   </dependency>
   

2. java 代码

   package com.jin.demo.jackson;
   
   import com.fasterxml.jackson.databind.ObjectMapper;
   
   import java.util.HashMap;
   import java.util.Map;
   
   /**
    * 使用 Jackson工具
    * map to bean
    * bean to map
    *
    * @auther jinsx
    * @date 2019-03-26 16:37
    */
   public class JacksonTest {
   
       private static final ObjectMapper mapper = new ObjectMapper();
   
       public static void main(String[] args) throws Exception {
           // 测试 将Map转成指定的Bean
           Map<String, Object> map = new HashMap<>();
           map.put("name", "张三");
           Person o = (Person)JacksonTest.mapToBean(map, Person.class);
           System.out.println(o);
           // 测试 将Bean转成Map
           Person person = new Person();
           person.setAge(18);
           Map map1 = JacksonTest.beanToMap(person);
           System.out.println(map1);
       }
   
       // 将对象转成字符串
       public static String objectToString(Object obj) throws Exception {
           return mapper.writeValueAsString(obj);
       }
       // 将Map转成指定的Bean
       public static Object mapToBean(Map map, Class clazz) throws Exception {
           return mapper.readValue(objectToString(map), clazz);
       }
       // 将Bean转成Map
       public static Map beanToMap(Object obj) throws Exception {
           return mapper.readValue(objectToString(obj), Map.class);
       }
   }
   

3. Person 类

   package com.jin.demo.jackson;
   
   import java.io.Serializable;
   import java.util.Date;
   
   /**
    * @auther jinsx
    * @date 2019-03-26 17:30
    */
   public class Person implements Serializable {
       private int age;
       private String name;
       private Date birthday;
   
       public int getAge() {
           return age;
       }
   
       public void setAge(int age) {
           this.age = age;
       }
   
       public String getName() {
           return name;
       }
   
       public void setName(String name) {
           this.name = name;
       }
   
       public Date getBirthday() {
           return birthday;
       }
   
       public void setBirthday(Date birthday) {
           this.birthday = birthday;
       }
   
       @Override
       public String toString() {
           return "Person{" +
                   "age=" + age +
                   ", name='" + name + '\'' +
                   ", birthday=" + birthday +
                   '}';
       }
   }