Object 转Map，Map转Object方式总结

你的名字 2023-10-10 13:53 76阅读 0赞

**商品业务对象定义：Product**

Product product = new Product();
    product.setId(1L);
    product.setName("爱他美")
    product.setProductDt("2022-03-16")

**第一种：通过Alibaba Fastjson实现：**

**pom.xml 文件依赖**

<dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.66</version>
    </dependency>

//Object转Map
    Map map = JSONObject.parseObject(JSONObject.toJSONString(product), Map.class);
    Map<String,Object> map = JSONObject.parseObject(JSON.toJSONString(product));
    //Map转Object
    Product productDto1 = JSON.parseObject(JSON.toJSONString(map), Product.class);
    Product productDto2 = JSONObject.toJavaObject(JSON.toJSONString(map), Product.class);

**第二种：通过SpringBoot自带 Jackso实现**

一般情况下我们引入MVC，MVC里面帮我们引入了**Jackso**依赖

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>

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最终的依赖：

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ObjectMapper mapper = new ObjectMapper();
    //对象转map
    Map m = mapper.readValue(mapper.writeValueAsString(product), Map.class);
    //map转对象
    Product dto = mapper.readValue(mapper.writeValueAsString(m), Product.class);

**第三种：通过Apache common Bean工具类实现**

Pom.xml文件依赖

<dependency>
        <groupId>commons-beanutils</groupId>
        <artifactId>commons-beanutils</artifactId>
        <version>1.9.3</version>
    </dependency>

#使用org.apache.commons.beanutils.BeanMap进行转换，实现Bean转Map
    Map<String, Object> map = new org.apache.commons.beanutils.BeanMap(product);
    
    #使用org.apache.commons.beanutils.BeanUtils将map转为对象
    BeanUtils.populate(product, map);

**第四种： 通过反射实现**

通过反射实现Bean 转Map

//Object转Map
    public static Map<String, Object> getObjectToMap(Object obj) throws IllegalAccessException {
        Map<String, Object> map = new LinkedHashMap<String, Object>();
        Class<?> clazz = obj.getClass();
        System.out.println(clazz);
        for (Field field : clazz.getDeclaredFields()) {
            field.setAccessible(true);
            String fieldName = field.getName();
            Object value = field.get(obj);
            if (value == null){
                value = "";
            }
            map.put(fieldName, value);
        }
        return map;
    }

通过反射实现Map转Bean

//Map转Object
    public static Object mapToObject(Map<Object, Object> map, Class<?> beanClass) throws Exception {
        if (map == null)
            return null;
        Object obj = beanClass.newInstance();
        Field[] fields = obj.getClass().getDeclaredFields();
        for (Field field : fields) {
            int mod = field.getModifiers();
            if (Modifier.isStatic(mod) || Modifier.isFinal(mod)) {
                continue;
            }
            field.setAccessible(true);
            if (map.containsKey(field.getName())) {
                field.set(obj, map.get(field.getName()));
            }
        }
        return obj;
    }

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