转换复杂的JSON对象为 Map对象

最近项目需要跟客户对接一个webservice接口，客户那传json串过来，属于比较复杂的json串，这里跟大家分享下我项目中所用的解析方法：

该方法需要以下jar

package com.test;

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

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

/**
 * 描述
 * @author 小当家
 * @created 2017年12月7日 上午9:08:03
 */
public class TestJson {
    
    /**
     * 
     * 描述: 转换复杂的JSON对象为 Map对象
     * @author 小当家
     * @created 2017年12月7日 上午9:15:12
     * @param jsonStr
     * @return
     */
    @SuppressWarnings("unused")
    private static Map<String, Object> parseJSON2Map(String jsonStr) {
        Map<String, Object> map = new HashMap<String, Object>();
        // 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(parseJSON2Map(json2.toString()));
                }
                map.put(k.toString(), list);
            } else {
                map.put(k.toString(), v);
            }
        }
        return map;
    } 
    
    public static void main(String[] args) {
        String jsonString = "{"payCnt":3,"payInfo":[{"payInfoMain":{"ordNum":"201206010000001","transSite":"","transBankNo":"TEPB","bankAcctNo":"010","totAmt":"30","billChkCode":"3316","tollDeptNo":"NDZSXH000","busType":"FJFS","other1":"remark1","other2":"remark2","bankName":"模拟银行2","transSeq":"20120601000000001","tranType":"","siteCode":"200001","eBillVerNo":"000001","tollDeptName":"宁德市会计专业技术考试领导小组","itemCnt":1,"tranUser":"","payer":"宁德","eBillNo":"201206010000000136","transBankName":"模拟银行2","transAcctNo":"010","siteName":"国家司法考试网","ordDate":"20120601"},"eBillNo":"201206010000000136","payInfoItem":[{"amt":"30","chrgStd":"1","cnt":"1","chrgName":"初级网络工程师报名费","msrUint":"元/科","chrgCode":"KA460001"}]},{"payInfoMain":{"ordNum":"201206010000001","transSite":"","transBankNo":"TEPB","bankAcctNo":"010","totAmt":"10","billChkCode":"2258","tollDeptNo":"777516727","busType":"FJFS","other1":"remark1","other2":"remark2","bankName":"模拟银行2","transSeq":"20120601000000001","tranType":"","siteCode":"200001","eBillVerNo":"000001","tollDeptName":"福建省省会计管理处","itemCnt":1,"tranUser":"","payer":"缴款人","eBillNo":"201206010000000134","transBankName":"模拟银行2","transAcctNo":"010","siteName":"国家司法考试网","ordDate":"20120601"},"eBillNo":"201206010000000134","payInfoItem":[{"amt":"10","chrgStd":"1","cnt":"1","chrgName":"交通罚没","msrUint":"元/科","chrgCode":"460"}]},{"payInfoMain":{"ordNum":"201206010000001","transSite":"","transBankNo":"TEPB","bankAcctNo":"010","totAmt":"20","billChkCode":"0198","tollDeptNo":"003604520","busType":"FJFS","other1":"remark1","other2":"remark2","bankName":"模拟银行2","transSeq":"20120601000000001","tranType":"","siteCode":"200001","eBillVerNo":"000001","tollDeptName":"福州市财政局会计管理处","itemCnt":1,"tranUser":"","payer":"福州","eBillNo":"201206010000000135","transBankName":"模拟银行2","transAcctNo":"010","siteName":"国家司法考试网","ordDate":"20120601"},"eBillNo":"201206010000000135","payInfoItem":[{"amt":"20","chrgStd":"1","cnt":"1","chrgName":"会计从业资格证考务费","msrUint":"元/科","chrgCode":"BA460"}]}]}";
        Map<String, Object> map=  parseJSON2Map(jsonString);
        System.out.println(map.get("payCnt"));//获取电子票据数目
        List list = (List)map.get("payInfo");//获取电子票据信息（List类型）
        Map t = (Map)list.get(0);//获取第一行记录，Map类型
        Map mainMap = (Map)t.get("payInfoMain");//获取电子票据主要信息，Map类型
        String user = (String)mainMap.get("payer");//取出缴款人
        System.out.println(user);
        
    }
}

经过测试后台打印：3    宁德