json字符串转为map结构，复杂json字符串转为map结构

https://blog.csdn.net/weixin_39800144/article/details/77871115

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject
public class Json2Map {
 
    /**
     * 将json字符串转为Map结构
     * 如果json复杂，结果可能是map嵌套map
     * @param jsonStr 入参，json格式字符串
     * @return 返回一个map
     */
    public static Map<String, Object> json2Map(String jsonStr) {
        Map<String, Object> map = new LinkedHashMap<>();
        if(jsonStr != null && !"".equals(jsonStr)){
            //最外层解析
            JSONObject json = JSONObject.fromObject(jsonStr);
            for (Object k : json.keySet()) {
                Object v = json.get(k);
                //如果内层还是数组的话，继续解析
                if (v instanceof JSONArray) {
                    List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
                    Iterator<JSONObject> it = ((JSONArray) v).iterator();
                    while (it.hasNext()) {
                        JSONObject json2 = it.next();
                        list.add(json2Map(json2.toString()));
                    }
                    map.put(k.toString(), list);
                } else {
                    map.put(k.toString(), v);
                }
            }
            return map;
        }else{
            return null;
        }
    }
}

net.sf.json.JSONObject maven依赖

<dependency>
            <groupId>net.sf.json-lib</groupId>
            <artifactId>json-lib</artifactId>
            <version>2.4</version>
            <classifier>jdk15</classifier>
</dependency>