ObjectMapper將復雜Map轉為實體類
背景
用fastjson轉換復雜Map是淺層的可以轉 深層的轉換為null.，這時候可以用jackson來轉。
1.使用ObjectMapper要添加的依賴是
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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.將復雜Map開始轉換
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ObjectMapper mapper = new ObjectMapper();Resource resource = mapper.convertValue(Map, Resource.class); |
注意的點：實體類中的字段是駝峰的 首字母不能大寫。
objectMapper 解析復雜json toMap
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public void parseSettings(){ String settings = "{\"基本設置\":{\"name\":\"基本設置\",\"entries\":[{\"name\":\"站號\",\"type\":\"number\",\"description\":\"\",\"value\":\"1\"},{\"name\":\"AppEUI\",\"type\":\"string\",\"description\":\"\",\"value\":\"2C26C503A0010006\"},{\"name\":\"DevEUI\",\"type\":\"string\",\"description\":\"\",\"value\":\"4A7703A000FC09\"},{\"name\":\"命令次數\",\"type\":\"number\",\"description\":\"\",\"value\":\"2\"},{\"name\":\"父井號\",\"type\":\"string\",\"description\":\"\",\"value\":\"test11\"}]},\"油閥間\":{\"name\":\"油閥間\",\"entries\":[{\"name\":\"上傳間隔時間\",\"type\":\"number\",\"description\":\"\",\"value\":\"2\"},{\"name\":\"設定值\",\"type\":\"number\",\"description\":\"\",\"value\":\"10\"},{\"name\":\"波動值\",\"type\":\"number\",\"description\":\"\",\"value\":\"1\"},{\"name\":\"控制模式\",\"type\":\"number\",\"description\":\"\",\"value\":\"0\"},{\"name\":\"調節上限\",\"type\":\"number\",\"description\":\"\",\"value\":\"15\"},{\"name\":\"調節下限\",\"type\":\"number\",\"description\":\"\",\"value\":\"5\"},{\"name\":\"調節時間\",\"type\":\"number\",\"description\":\"\",\"value\":\"10\"}]},\"采集調度\":{\"name\":\"采集調度\",\"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("基本設置"); for (SettingEntry entry : group.getEntries()) { System.out.println(entry.getName()); } group = mapSettings.get("油閥間"); 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(); } } |
以上為個人經驗，希望能給大家一個參考，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/qq_31442649/article/details/108844155
