转换复杂的JSON对象为 Map对象

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);
        
    }
}