java - 使用 json 字符串创建 java map

Question

{
 "userType": "I",
 "classList": [
   {
     "id": 1,
     "name": "c1"
   },
   {
     "id": 2,
     "name": "c2"
   },
   {
     "id": 3,
     "name": "c3"
   }
 ]
}

如何声明上述示例并为其赋值？

Answer 1

使用 jackson 库，

HashMap<String,Object> map =
    new ObjectMapper().readValue(jsonString, HashMap.class);

将此依赖项用于 Maven，

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.8.7</version>
</dependency>