fastjson --JSONObject 和JSONArray 转换

fastjson解析：
resultValue=
[
    {
        "total": 1,
        "saleLists": [
            {
                "categoryInfo": "测试父分类",
                "id": 12,
                "vendor_code": 0,
                "brandInfo": "非龙品牌,",
            }
        ]
    }
]
第一步：解析完成以后   {"total": 1,"saleLists": [{"categoryInfo": "测试父分类","id": 12,"vendor_code": 0,"brandInfo": "非龙品牌,",}]}

     JSONObject js=JSON.parseObject(JSON.parseArray(resultValue).get(0).toString());

第二步：解析完成后   [{"categoryInfo": "测试父分类","id": 12,"vendor_code": 0,"brandInfo": "非龙品牌,",}]

     JSONArray js2=JSON.parseArray(js.getString("saleLists").toString());

第三步：解析完成后  {"categoryInfo": "测试父分类","id": 12,"vendor_code": 0,"brandInfo": "非龙品牌,",}

     JSONObject jsObj2=JSON.parseObject(js2.get(0).toString());

第四步：js2jsObj2.getString("id"),得到12