Java 中 Json 扁平化与去扁平化处理

• 引入依赖

<!--依赖 -->
<dependency>
     <groupId>com.github.wnameless.json</groupId>
     <artifactId>json-flattener</artifactId>
     <version>0.16.4</version>
 </dependency>

• demo

    public static void main(String[] args) {
        String jsonStr = "";
        jsonStr = FileUtil.readUtf8String("x.json");

        // 扁平化，深层次的json结构转成key-value
        Map<String, Object> flatJson = JsonFlattener.flattenAsMap(jsonStr);
        flatJson.entrySet().forEach(System.out::println);

        // 去扁平化，还原深层次的json
        String unFlatten = JsonUnflattener.unflatten(flatJson);

        // 扁平化级别默认.隔开，withSeparator 指定分割符
        JsonFlattener jsonFlattener = new JsonFlattener(jsonStr);
        Map<String, Object> map = jsonFlattener.withSeparator('-').flattenAsMap();
    }

• 效果

# 原始json
{
    "code": 200,
    "data": [
        {
            "no": "1001",
            "school": "xxx市第一实验小学",
            "class": [
                {
                    "student": [
                        {
                            "name": "张同学",
                            "age": 6
                        },
                        {
                            "name": "王同学",
                            "age": 7
                        }
                    ],
                    "teacher": "吴老师",
                    "name": "一(1)班"
                }
            ]
        },
        {
            "no": "1002",
            "school": "xxx市第二实验小学",
            "class": [
                {
                    "student": [
                        {
                            "name": "欧阳同学",
                            "age": 6
                        }
                    ],
                    "teacher": "陈老师",
                    "name": "一(2)班"
                }
            ]
        }
    ],
    "requestId": "1680177848458"
}





# 扁平化
code=200
requestId=1680177848458
data[0]-school=xxx市第一实验小学
data[0]-no=1001
data[0]-class[0]-name=一(1)班
data[0]-class[0]-teacher=吴老师
data[0]-class[0]-student[0]-name=张同学
data[0]-class[0]-student[0]-age=6
data[0]-class[0]-student[1]-name=王同学
data[0]-class[0]-student[1]-age=7
data[1]-school=xxx市第二实验小学
data[1]-no=1002
data[1]-class[0]-name=一(2)班
data[1]-class[0]-teacher=陈老师
data[1]-class[0]-student[0]-name=欧阳同学
data[1]-class[0]-student[0]-age=6



# 去扁平化
{
    "code": 200,
    "data": [
        {
            "no": "1001",
            "school": "xxx市第一实验小学",
            "class": [
                {
                    "student": [
                        {
                            "name": "张同学",
                            "age": 6
                        },
                        {
                            "name": "王同学",
                            "age": 7
                        }
                    ],
                    "teacher": "吴老师",
                    "name": "一(1)班"
                }
            ]
        },
        {
            "no": "1002",
            "school": "xxx市第二实验小学",
            "class": [
                {
                    "student": [
                        {
                            "name": "欧阳同学",
                            "age": 6
                        }
                    ],
                    "teacher": "陈老师",
                    "name": "一(2)班"
                }
            ]
        }
    ],
    "requestId": "1680177848458"
}