服务器之家:专注于服务器技术及软件下载分享
分类导航

PHP教程|ASP.NET教程|Java教程|ASP教程|编程技术|正则表达式|C/C++|IOS|C#|Swift|Android|VB|R语言|JavaScript|易语言|vb.net|

服务器之家 - 编程语言 - Java教程 - 如何用ObjectMapper将复杂Map转换为实体类

如何用ObjectMapper将复杂Map转换为实体类

2021-11-24 13:07墨一般的白色 Java教程

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

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

?
1
2
3
4
5
6
<!--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

?
1
2
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

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
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服务器之家。

原文链接:https://blog.csdn.net/qq_31442649/article/details/108844155

延伸 · 阅读

精彩推荐