如何用ObjectMapper将复杂Map转换为实体类

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这篇文章主要介绍了如何用ObjectMapper将复杂Map转换为实体类的操作，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教
目录

• ObjectMapper将复杂Map转为实体类
  
  
  
  • 背景
    
  • 1.使用ObjectMapper要添加的依赖是
    
  • 2.将复杂Map开始转换
    
  
  
• objectMapper 解析复杂json toMap
  

ObjectMapper将复杂Map转为实体类

背景
用fastjson转换复杂Map是浅层的可以转 深层的转换为null.，这时候可以用jackson来转。

1.使用ObjectMapper要添加的依赖是

<!--添加jackson包-->
 <dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-databind</artifactId>
   <version>2.8.3</version>
 </dependency>

2.将复杂Map开始转换

ObjectMapper mapper = new ObjectMapper();
Resource resource = mapper.convertValue(Map, Resource.class);

注意的点：实体类中的字段是驼峰的 首字母不能大写。

objectMapper 解析复杂json toMap

public void parseSettings(){
    
    String settings = "{"基本设置":{"name":"基本设置","entries":[{"name":"站号","type":"number","description":"","value":"1"},{"name":"AppEUI","type":"string","description":"","value":"2C26C503A0010006"},{"name":"DevEUI","type":"string","description":"","value":"4A7703A000FC09"},{"name":"命令次数","type":"number","description":"","value":"2"},{"name":"父井号","type":"string","description":"","value":"test11"}]},"油阀间":{"name":"油阀间","entries":[{"name":"上传间隔时间","type":"number","description":"","value":"2"},{"name":"设定值","type":"number","description":"","value":"10"},{"name":"波动值","type":"number","description":"","value":"1"},{"name":"控制模式","type":"number","description":"","value":"0"},{"name":"调节上限","type":"number","description":"","value":"15"},{"name":"调节下限","type":"number","description":"","value":"5"},{"name":"调节时间","type":"number","description":"","value":"10"}]},"采集调度":{"name":"采集调度","entries":[{"name":"interval","type":"number","description":"","value":"2"}]}}";
    ObjectMapper objectMapper = new ObjectMapper();
    JavaType javaType = objectMapper.getTypeFactory().constructMapType(HashMap.class, String.class, SettingGroup.class);
    try {
      Map<String,SettingGroup>  mapSettings =  objectMapper.readValue(settings, javaType);
       SettingGroup group = mapSettings.get("基本设置");
       for (SettingEntry entry : group.getEntries()) {
         System.out.println(entry.getName());          
       }
      
       group = mapSettings.get("油阀间");
       for (SettingEntry entry : group.getEntries()) {
         System.out.println("entry.Name:"+entry.getName()+" entry.getValue:"+entry.getValue());
       }
    } catch (JsonParseException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (JsonMappingException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }    
  }

以上为个人经验，希望能给大家一个参考，也希望大家多多支持CodeAE代码之家。
原文链接：https://blog.csdn.net/qq_31442649/article/details/108844155