pom文件：

   <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.29</version>
</dependency>

json case:

//日期转换  ：
 String name=JSON.toJSONStringWithDateFormat(new Date(), "yyyy-MM-dd HH:mm:ss");
        System.out.println(name);
        //输出"2018-05-08 18:08:39"


//String 转换json，json转换为String：
        String name="{\"bankCode\":\"CMB\",\"amount\":\"1.00\",\"orderNo\":" +
                "\"201804251409213988\",\"merchantId\":\"200000000004381\",\"token\":" +
                "\"C214FD0B7B6D3F912408B2F215127638\",\"channelAppType\":\"BANKPAY\"}";
        JSONObject jsonObject =JSONObject.parseObject(name);
        String str = JSON.toJSONString(jsonObject );
        System.out.println(str);

        //map转换成String的json串
        Map m1= new HashMap();
        m1.put("name","chenliuca");m1.put("home","china");
        String str = JSON.toJSONString(m1);
        System.out.println(str);


      //json转换为map或者其他对象
     (Map) JSON.parseObject(str)

        //对象转换为jsonString
        Happiness happ =new Happiness();
        happ.setCity("北京");happ.setId(10L);happ.setNum(12);
        String str = JSON.toJSONString(happ);
        System.out.println(str);
        //输出{"city":"北京","id":10,"num":12}

根据下列获取取对应json内容
    JSONObject jsonObject=JSONObject.parseObject(name);
    //判断是是不是json格式
      /*  public boolean isJson(String name){
        if(name.equals("")){
            return false;
        }
            try {
                JSONObject jsonStr= JSONObject.parseObject(name);
                return  true;
            } catch (Exception e) {
                return false;
            }
        }*/
        String str = JSON.toJSONString(jsonObject);
        System.out.println(str);
        System.out.println("totalRecords为 :"+jsonObject.getString("totalRecords"));
        System.out.println("result: "+jsonObject.getString("result"));
        System.out.println("result: "+jsonObject.getJSONObject("result"));
        System.out.println("selList :"+jsonObject.getJSONArray("selList"));
        System.out.println("selList第一个: "+jsonObject.getJSONArray("selList").get(0));
        System.out.println("获取JSONArray里面第一个json :"+jsonObject.getJSONArray("selList").getJSONObject(0));
        System.out.println("regNO为: "+jsonObject.getJSONArray("selList").getJSONObject(0).getString("regNO"));
        System.out.println("判断是不是json类型 :"+jsonObject.getJSONArray("selList").getJSONObject(0).getString("regNO"));
/*
{"result":{"code":"200","status":"success"},"totalRecords":2615,"selList":[{"regNO":"442000602187424","abnTime":"Mar 13, 2015 12:00:00 AM","entNameUrl":"<a href=\"..\">","entNo":"16da9629-0131-1000-e005-3effc0a803a8"},{"decOrg":"442020","auditingFileNo":"15000684990326","abnormalID":"fd74013d-014b-1000-e00a-72970a0d0114","entNameUrl":"<a href=\".. "}],"pageNo":1,"totalPages":327,"pageSize":8,"list":[{"regNO":"442000600169663","abnTime":"Mar 13, 2015 12:00:00 AM","entNameUrl":"<a href=\".. ","entNo":"1c2e4ca8-00fa-1000-e000-74590a76bf0f"},{"decOrg":"442020","auditingFileNo":"15000684990326","abnormalID":"fd74013d-014b-1000-e00a-72970a0d0114","entNameUrl":"<a href=\".. "}],"topPageNo":1,"url":"main/abnInfoPage"}
totalRecords为 :2615
result: {"code":"200","status":"success"}
result: {"code":"200","status":"success"}
selList :[{"regNO":"442000602187424","abnTime":"Mar 13, 2015 12:00:00 AM","entNameUrl":"<a href=\"..\">","entNo":"16da9629-0131-1000-e005-3effc0a803a8"},{"decOrg":"442020","auditingFileNo":"15000684990326","abnormalID":"fd74013d-014b-1000-e00a-72970a0d0114","entNameUrl":"<a href=\".. "}]
selList第一个: {"regNO":"442000602187424","abnTime":"Mar 13, 2015 12:00:00 AM","entNameUrl":"<a href=\"..\">","entNo":"16da9629-0131-1000-e005-3effc0a803a8"}
获取JSONArray里面第一个json :{"regNO":"442000602187424","abnTime":"Mar 13, 2015 12:00:00 AM","entNameUrl":"<a href=\"..\">","entNo":"16da9629-0131-1000-e005-3effc0a803a8"}
regNO为: 442000602187424
判断是不是json类型 :442000602187424
*/

{
    "totalRecords": 2615,
    "result": {
        "code": "200",
        "status": "success"
    },
    "list": [{
        "entNo": "1c2e4ca8-00fa-1000-e000-74590a76bf0f",
        "regNO": "442000600169663",
        "abnTime": "Mar 13, 2015 12:00:00 AM",
        "entNameUrl": "<a href=\".. ",
    }, {
        "decOrg": "442020",
        "entNameUrl": "<a href=\".. ",
        "auditingFileNo": "15000684990326",
        "abnormalID": "fd74013d-014b-1000-e00a-72970a0d0114"
    }],
    "pageNo": 1,
    "pageSize": 8,
    "url": "main/abnInfoPage",
    "selList": [{
        "entNo": "16da9629-0131-1000-e005-3effc0a803a8",
        "regNO": "442000602187424",
        "abnTime": "Mar 13, 2015 12:00:00 AM",
        "entNameUrl": "<a href=\"..\">",
    }, {
        "decOrg": "442020",
        "entNameUrl": "<a href=\".. ",
        "auditingFileNo": "15000684990326",
        "abnormalID": "fd74013d-014b-1000-e00a-72970a0d0114"
    }],
    "topPageNo": 1,
    "totalPages": 327
}