使用Jackson實現Map與Bean互轉

在使用 java 開發中，通常需要把 Map 轉成 Bean，或把 Bean 轉成 Map，這就用的工具類，在此推薦使用import com.fasterxml.jackson.databind.ObjectMapper;包下的ObjectMapper類，比 JsonObject 效率高，下面就列舉了幾種使用方法。

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 代碼

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 {
        // 測試 將Map轉成指定的Bean
        Map<String, Object> map = new HashMap<>();
        map.put("name", "張三");
        Person o = (Person)JacksonTest.mapToBean(map, Person.class);
        System.out.println(o);
        // 測試 將Bean轉成Map
        Person person = new Person();
        person.setAge(18);
        Map map1 = JacksonTest.beanToMap(person);
        System.out.println(map1);
    }

    // 將對象轉成字符串
    public static String objectToString(Object obj) throws Exception {
        return mapper.writeValueAsString(obj);
    }
    // 將Map轉成指定的Bean
    public static Object mapToBean(Map map, Class clazz) throws Exception {
        return mapper.readValue(objectToString(map), clazz);
    }
    // 將Bean轉成Map
    public static Map beanToMap(Object obj) throws Exception {
        return mapper.readValue(objectToString(obj), Map.class);
    }
}

 

3.Person 類

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 +
                '}';
    }
}

 

 

 

 

 

轉: https://blog.csdn.net/axing2015/article/details/88827053