1.Map转化为json

 Map<String, Object> data;

JSONObject dataJson = new JSONObject(data);//map转化为json

    String  cano= dataJson.get("CarNO");

2.String转化为json

eg1

String  results=    saveorUpdateServices.execute(params,type);


System.out.println("*********results:"+results);
JSONObject dataJson = new JSONObject();//注意这里的JSONObject为com.alibaba.fastjson

/*com.alibaba.fastjson.JSONObject dataJson = new com.alibaba.fastjson.JSONObject();*/

JSONObject  er=    (JSONObject) dataJson.parse(results);//String转化为json
success=     Integer.valueOf(er.get("success").toString()) ;

eg2

    String results = EntityUtils.toString(response.getEntity());
JsonObject json=new JsonParser().parse(results).getAsJsonObject();
int resultCode=json.get("resultCode").getAsInt();
System.out.println("querypersonsbycar-SUCCESS:获取人员卡信息成功没有信息时的数据!\n\t信息如下："+json);
if(resultCode==0){
JsonElement dataItems=json.get("dataItems");

3.String转为Map,Map转为json:

    results = queryorder.payordermihelp(orderno, "Weixin", null, "蜜服务测试", 1, null, null, 1, null, null, null,
"测试", null, "691152", "", "", null, "wxc992e3bd110b5b87", openid);

        Map mihelpmap = net.sf.json.JSONObject.fromObject(results);//String转Map

com.alibaba.fastjson.JSONObject dataJson = new com.alibaba.fastjson.JSONObject(mihelpmap );//map转json