Object Mapper 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
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<!--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
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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
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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。
原文链接：https://blog.csdn.net/qq_31442649/article/details/108844155
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