Java json转Map，转bean，转List<bean>

最新推荐文章于 2025-05-26 17:34:25 发布

原创最新推荐文章于 2025-05-26 17:34:25 发布 · 3.9k 阅读

8 ·

CC 4.0 BY-SA版权

Java 专栏收录该内容

71 篇文章

订阅专栏

本文介绍了一种使用Jackson库实现JSON字符串与Java对象（包括Map、Bean和List）互相转换的方法。通过提供的实用类`JsonUtil`，可以轻松地进行JSON格式的数据解析和序列化。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

引用jackson

/**
*  json转Map，转bean，转List<bean> by http://blog.youkuaiyun.com/21aspnet/
*  需要jackjson jar包
*/
public class JsonUtil {

    /**
     * Object转Json
     */
    public static String ObjectToJson(Object value) {
        try {
            ObjectMapper mapper = new ObjectMapper();
            String js = mapper.writeValueAsString(value);
            return js;
        } catch (Exception e) {
            System.out.println(e.toString());
            return "Error";
        }
    }

    /**
     * Json转Object
     */
    public static Object JsonToList(String json, Class<?> bean) throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        JavaType javaType = mapper.getTypeFactory().constructParametricType(List.class, bean);
        return mapper.readValue(json, javaType);
    }

    /**
     * Json转Object
     */
    public static Object JsonToBean(String json, Class<?> bean) throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        JavaType javaType = mapper.getTypeFactory().uncheckedSimpleType(bean);
        return mapper.readValue(json, javaType);
    }

    /**
     * Json转Map
     */
    public static Map<String, Map<String, String>> JsonToMap(String json) {
        try {
            ObjectMapper mapper = new ObjectMapper();
            Map<String, Map<String, String>> maps = mapper.readValue(json, Map.class);                      
            return maps;
        } catch (Exception e) {
            System.out.println(e.toString());
            return null;
        }
    }
}