本篇內(nèi)容主要講解“怎么用ObjectMapper將Map轉(zhuǎn)換為實(shí)體類”，感興趣的朋友不妨來看看。本文介紹的方法操作簡(jiǎn)單快捷，實(shí)用性強(qiáng)。下面就讓小編來帶大家學(xué)習(xí)“怎么用ObjectMapper將Map轉(zhuǎn)換為實(shí)體類”吧!

目錄

• ObjectMapper將復(fù)雜Map轉(zhuǎn)為實(shí)體類

• 背景

• 1.使用ObjectMapper要添加的依賴是

• 2.將復(fù)雜Map開始轉(zhuǎn)換

• objectMapper 解析復(fù)雜json toMap

ObjectMapper將復(fù)雜Map轉(zhuǎn)為實(shí)體類

背景

用fastjson轉(zhuǎn)換復(fù)雜Map是淺層的可以轉(zhuǎn) 深層的轉(zhuǎn)換為null.，這時(shí)候可以用jackson來轉(zhuǎn)。

1.使用ObjectMapper要添加的依賴是

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

2.將復(fù)雜Map開始轉(zhuǎn)換

ObjectMappermapper=newObjectMapper();
Resourceresource=mapper.convertValue(Map,Resource.class);

注意的點(diǎn)：實(shí)體類中的字段是駝峰的 首字母不能大寫。

objectMapper 解析復(fù)雜json toMap

publicvoidparseSettings(){

Stringsettings="{\"基本設(shè)置\":{\"name\":\"基本設(shè)置\",\"entries\":[{\"name\":\"站號(hào)\",\"type\":\"number\",\"description\":\"\",\"value\":\"1\"},{\"name\":\"AppEUI\",\"type\":\"string\",\"description\":\"\",\"value\":\"2C26C503A0010006\"},{\"name\":\"DevEUI\",\"type\":\"string\",\"description\":\"\",\"value\":\"4A7703A000FC09\"},{\"name\":\"命令次數(shù)\",\"type\":\"number\",\"description\":\"\",\"value\":\"2\"},{\"name\":\"父井號(hào)\",\"type\":\"string\",\"description\":\"\",\"value\":\"test11\"}]},\"油閥間\":{\"name\":\"油閥間\",\"entries\":[{\"name\":\"上傳間隔時(shí)間\",\"type\":\"number\",\"description\":\"\",\"value\":\"2\"},{\"name\":\"設(shè)定值\",\"type\":\"number\",\"description\":\"\",\"value\":\"10\"},{\"name\":\"波動(dòng)值\",\"type\":\"number\",\"description\":\"\",\"value\":\"1\"},{\"name\":\"控制模式\",\"type\":\"number\",\"description\":\"\",\"value\":\"0\"},{\"name\":\"調(diào)節(jié)上限\",\"type\":\"number\",\"description\":\"\",\"value\":\"15\"},{\"name\":\"調(diào)節(jié)下限\",\"type\":\"number\",\"description\":\"\",\"value\":\"5\"},{\"name\":\"調(diào)節(jié)時(shí)間\",\"type\":\"number\",\"description\":\"\",\"value\":\"10\"}]},\"采集調(diào)度\":{\"name\":\"采集調(diào)度\",\"entries\":[{\"name\":\"interval\",\"type\":\"number\",\"description\":\"\",\"value\":\"2\"}]}}";
ObjectMapperobjectMapper=newObjectMapper();
JavaTypejavaType=objectMapper.getTypeFactory().constructMapType(HashMap.class,String.class,SettingGroup.class);
try{
Map<String,SettingGroup>mapSettings=objectMapper.readValue(settings,javaType);
SettingGroupgroup=mapSettings.get("基本設(shè)置");
for(SettingEntryentry:group.getEntries()){
System.out.println(entry.getName());
}

group=mapSettings.get("油閥間");
for(SettingEntryentry:group.getEntries()){
System.out.println("entry.Name:"+entry.getName()+"entry.getValue:"+entry.getValue());
}
}catch(JsonParseExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(JsonMappingExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}

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