json-util

json-util工具类整合了Jackson、Gson和Fastjson库并统一API。

使用环境

• JDK7+
• Maven

功能

统一调用API，形如toXXX。目前支持的转换的列表：
- List
- Map
- JsonString
- Pojo

List支持泛型，JsonString支持指定日期格式化，支持对象和Map的互相转换。

支持从application.properties或application.yml中设置解析Json的库(jackson, gson, fastjson)。

application.properties:

json.class.type=jackson

application.yml:

json:
  class-type: gson

支持自动查找用户引入的Json库(jackson, gson, fastjson)用来解析Json

使用

添加Maven依赖

jackson，gson，fastjson三者择一

<properties>
    <jackson.version>2.9.0</jackson.version>
    <gson.version>2.8.2</gson.version>
    <fastjson.version>1.2.44</fastjson.version>
</properties>
<dependencies>
    <dependency>
        <groupId>io.github.yidasanqian</groupId>
        <artifactId>json-util</artifactId>
        <version>1.0.0</version>
    </dependency>
    <!-- use jackson lib-->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>${jackson.version}</version>          
    </dependency>
     <!-- or use gson lib-->
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>${gson.version}</version>     
    </dependency>
     <!-- or use fastjson lib-->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>${fastjson.version}</version>      
    </dependency>
</dependencies>

例子

默认从application.properties或application.yml中读取配置的Json库，

若未配置则自动查找用户引入的Json库(jackson, gson, fastjson)，若存在多个则默认使用Jackson作为json解析库。

解析到List

 String json = "[1, 2, 4, 5]";
 List result = JsonUtil.toList(json);

 ...
 json = "[{"id": 1,"username": "yidasanqian"},{"id": 2,"username": "yidasanqian2"}]"
 TypeReference<List<User>> typeReference = new TypeReference<List<User>>() {};
 List<User> result = JsonUtil.toList(json, typeReference.getType());

解析到Map

String json = "{
                 "id": 1,
                 "username": "yidasanqian",
                 "address": {
                   "id": 1,
                   "city": "杭州"
                 }
               }";
Map result = JsonUtil.toMap(json);

解析到String

User user = new User();
user.setId(1);
user.setUsername("yidasanqian");
String result = JsonUtil.toJsonString(user);

解析到指定对象

String json = "{
                 "id": 1,
                 "username": "yidasanqian"
               }";
User user = JsonUtil.toPojo(json, User.class);

Github地址:github.com/yidasanqian…

码云地址：gitee.com/yidasanqian…