关于json解析的无法接收报空指针的问题
2016-05-13 15:57
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前几天做了一个获取加油站信息的页面，给实体赋值时第一层能够的到，第二层就开始报空指针，于是我就开始到处找问题，刚开始以为是实体属性写错了，于是找其他人对，实体属性应该没有问题。数据是从聚合数据获取的，根据要求返回的是一个json形式的字符串。如下
根据返回的json应该写5个实体，我的实体属性确实没写错，问题出在我的实体名，实体名一定要和json返回的键值一样，否则就会报空指针！！研究了两天终于弄明白了。。。。
JSON返回示例：
{
"resultcode": "200",
"reason": "Successed!",
"result": {
"data": [
{
"id": "34299",
"name": "中油燕宾北邮加油站（办卡优惠）",
"area": "chongwen",
"areaname": "北京市 崇文区",
"address": "北京市崇文区天坛路12号，与东市场东街路交叉西南角（天坛北门往西一公里路南）。",
"brandname": "中石油",
"type": "加盟店",
"discount": "打折加油站",
"exhaust": "京Ⅴ",
"position": "116.401654,39.886973",
"lon": "116.40804671453",
"lat": "39.893324983272",
"price": [
{
"type": "E90",
"price": "7.31"
},
{
"type": "E93",
"price": "6.92"
},
{
"type": "E97",
"price": "7.36"
},
{
"type": "E0",
"price": "6.84"
}
],
"gastprice": [
{
"name": "92#",
"price": "6.77"
},
{
"name": "95#",
"price": "7.36"
}
],
"fwlsmc": "银联卡,信用卡支付",
"distance": 2564
},
{
"id": "34316",
"name": "中油北汽宣武门加油站（办卡优惠）",
"area": "xuanwu",
"areaname": "北京市 宣武区",
"address": "北京市宣武区宣武门西大街28院宣武门地铁西南出口辅路。",
"brandname": "中石油",
"type": "加盟店",
"discount": "打折加油站",
"exhaust": "京Ⅴ",
"position": "116.373169,39.899263",
"lon": "116.37964995964",
"lat": "39.905320913583",
"price": [
{
"type": "E90",
"price": "7.31"
},
{
"type": "E93",
"price": "6.92"
},
{
"type": "E97",
"price": "7.36"
},
{
"type": "E0",
"price": "6.84"
}
],
"gastprice": [
{
"name": "92#",
"price": "6.92"
},
{
"name": "95#",
"price": "7.36"
}
],
"fwlsmc": "银联卡,信用卡支付,加油卡,便利店,洗车服务",
"distance": 2332
},
{
"id": "34374",
"name": "中石化宣武门加油站",
"area": "xuanwu",
"areaname": "北京市 宣武区",
"address": "北京市宣武区宣武门东大街，（北京市急救中心对面，北京市教委斜对面。崇光百货的北面）。",
"brandname": "中石化",
"type": "直营店",
"discount": "打折加油站",
"exhaust": "京Ⅴ",
"position": "116.3724501688,39.8936984142",
"lon": "116.38527024009",
"lat": "39.905558817477",
"price": [
{
"type": "E90",
"price": "7.31"
},
{
"type": "E93",
"price": "6.92"
},
{
"type": "E97",
"price": "7.36"
},
{
"type": "E0",
"price": "6.84"
}
],
"gastprice": [
{
"name": "92#",
"price": "6.92"
},
{
"name": "95#",
"price": "7.36"
}
],
"fwlsmc": "银联卡,信用卡支付,加油卡,便利店,发卡充值网点,卫生间,银联卡充值,移动二维码业务,加油卡充值业务,会员卡服务,公交卡充值,出租车数据采集",
"distance": 1920
},
{
"id": "46231",
"name": "中石化崇文门加油站",
"area": "chongwen",
"areaname": "北京市 崇文区",
"address": "北京市崇文区崇文门东大街甲22号崇文门地铁站以东400米处,崇文门饭店东面。",
"brandname": "中石化",
"type": "直营店",
"discount": "打折加油站",
"exhaust": "京Ⅴ",
"position": "116.421336,39.900329",
"lon": "116.42778321554",
"lat": "39.906481951762",
"price": [
{
"type": "E90",
"price": "7.31"
},
{
"type": "E93",
"price": "6.92"
},
{
"type": "E97",
"price": "7.36"
},
{
"type": "E0",
"price": "6.84"
}
],
"gastprice": [
{
"name": "92#",
"price": "6.92"
},
{
"name": "95#",
"price": "7.36"
}
],
"fwlsmc": "加油卡,便利店,92#自助加油,95#自助加油,发卡充值网点,银联卡充值,移动二维码业务,加油卡充值业务,出租车数据采集",
4000
"distance": 2360
},
{
"id": "34280",
"name": "中石化北京站加油站",
"area": "dongcheng",
"areaname": "北京市 东城区",
"address": "北京市东城区西镇江胡同北京站西街路西北。",
"brandname": "中石化",
"type": "直营店",
"discount": "打折加油站",
"exhaust": "京Ⅴ",
"position": "116.422892,39.904058",
"lon": "116.42934447783",
"lat": "39.910183641108",
"price": [
{
"type": "E90",
"price": "7.31"
},
{
"type": "E93",
"price": "6.92"
},
{
"type": "E97",
"price": "7.36"
},
{
"type": "E0",
"price": "6.84"
}
],
"gastprice": [
{
"name": "0#",
"price": "6.84"
},
{
"name": "92#",
"price": "6.92"
},
{
"name": "95#",
"price": "7.36"
}
],
"fwlsmc": "加油卡,便利店,92#自助加油,95#自助加油,发卡充值网点,移动二维码业务,加油卡充值业务",
"distance": 2332
},
{
"id": "34359",
"name": "加油站（东四南大街）",
"area": "dongcheng",
"areaname": "北京市 东城区",
"address": "北京东城区东四南大街。",
"brandname": "不详",
"type": "其他",
"discount": "非打折加油站",
"exhaust": "京Ⅴ",
"position": "116.415918,39.910041",
"lon": "116.42232800867",
"lat": "39.916272549494",
"price": [
{
"type": "E90",
"price": "7.31"
},
{
"type": "E93",
"price": "6.92"
},
{
"type": "E97",
"price": "7.36"
},
{
"type": "E0",
"price": "6.84"
}
],
"gastprice": [
{
"name": "0#",
"price": "6.84"
},
{
"name": "92#",
"price": "6.92"
},
{
"name": "95#",
"price": "7.36"
}
],
"fwlsmc": "",
"distance": 1640
},
{
"id": "34297",
"name": "中石化金融街加油站",
"area": "xicheng",
"areaname": "北京市 西城区",
"address": "北京市西城区太平桥大街路西侧与二龙路西街交口处。",
"brandname": "中石化",
"type": "直营店",
"discount": "打折加油站",
"exhaust": "京Ⅴ",
"position": "116.362794,39.912337",
"lon": "116.36932672496",
"lat": "39.918204483855",
"price": [
{
"type": "E90",
"price": "7.31"
},
{
"type": "E93",
"price": "6.92"
},
{
"type": "E97",
"price": "7.36"
},
{
"type": "E0",
"price": "6.84"
}
],
"gastprice": [
{
"name": "92#",
"price": "6.92"
},
{
"name": "95#",
"price": "7.36"
}
],
"fwlsmc": "银联卡,信用卡支付,加油卡,便利店,发卡充值网点,卫生间,银联卡充值,移动二维码业务,加油卡充值业务,会员卡服务,公交卡充值,出租车数据采集",
"distance": 2895
},
{
"id": "75156",
"name": "中石油朝阳加油站",
"area": "",
"areaname": "北京市 东城区",
"address": "",
"brandname": "中石油",
"type": "其他",
"discount": "打折加油站",
"exhaust": "京Ⅴ",
"position": "116.42194748,39.91724124",
"lon": "116.4283836199",
"lat": "39.923379083879",
"price": [
{
"type": "E90",
"price": "7.31"
},
{
"type": "E93",
"price": "6.92"
},
{
"type": "E97",
"price": "7.36"
},
{
"type": "E0",
"price": "6.84"
}
],
"gastprice": [
{
"name": "0#",
"price": "6.84"
},
{
"name": "92#",
"price": "6.58"
}
],
"fwlsmc": "信用卡支付",
"distance": 2306
},
{
"id": "34360",
"name": "中国石化 (中国新闻出版总署东南)...",
"area": "dongcheng",
"areaname": "北京市 东城区",
"address": "北京市东四南大街106号中华人民共和国新闻出版总署东南。",
"brandname": "中石化",
"type": "直营店",
"discount": "打折加油站",
"exhaust": "京Ⅴ",
"position": "116.417775,39.92043",
"lon": "116.42418687653",
"lat": "39.926632910538",
"price": [
{
"type": "E90",
"price": "7.31"
},
{
"type": "E93",
"price": "6.92"
},
{
"type": "E97",
"price": "7.36"
},
{
"type": "E0",
"price": "6.84"
}
],
"gastprice": [
{
"name": "0#",
"price": "6.84"
},
{
"name": "92#",
"price": "6.92"
}
],
"fwlsmc": "加油卡",
"distance": 2151
},
{
"id": "34291",
"name": "中石化景山加油站",
"area": "dongcheng",
"areaname": "北京市 东城区",
"address": "北京市东城景山后街7号,区景山后街东段路北,与地安门内大街交叉口东。",
"brandname": "中石化",
"type": "直营店",
"discount": "打折加油站",
"exhaust": "京Ⅴ",
"position": "116.397631,39.928785",
"lon": "116.40399325389",
"lat": "39.935125033327",
"price": [
{
"type": "E90",
"price": "7.31"
},
{
"type": "E93",
"price": "6.92"
},
{
"type": "E97",
"price": "7.36"
},
{
"type": "E0",
"price": "6.84"
}
],
"gastprice": [
{
"name": "92#",
"price": "6.92"
}
],
"fwlsmc": "加油卡,便利店,发卡充值网点,移动二维码业务,加油卡充值业务,出租车数据采集",
"distance": 2126
},
{
"id": "15955",
"name": "中石化平安大街加油站 ",
"area": "xicheng",
"areaname": "北京市 西城区",
"address": "北京市西城区西城区地安门西大街，北海北门向西，教场胡同里。",
"brandname": "中石化",
"type": "直营店",
"discount": "打折加油站",
"exhaust": "京Ⅴ",
"position": "116.386505,39.932882",
"lon": "116.39289518126",
"lat": "39.93914114521",
"price": [
{
"type": "E90",
"price": "7.31"
},
{
"type": "E93",
"price": "6.92"
},
{
"type": "E97",
"price": "7.36"
},
{
"type": "E0",
"price": "6.84"
}
],
"gastprice": [
{
"name": "0#",
"price": "6.84"
},
{
"name": "92#",
"price": "6.92"
},
{
"name": "95#",
"price": "7.36"
}
],
"fwlsmc": "银联卡,加油卡,便利店,柴油自助加油,发卡充值网点,银联卡充值,移动二维码业务,加油卡充值业务,出租车数据采集",
"distance": 2715
}
],
"pageinfo": {
"pnums": 20,
"current": "1",
"allpage": 1
}
},
"error_code": 0
}根据返回的json应该写5个实体，我的实体属性确实没写错，问题出在我的实体名，实体名一定要和json返回的键值一样，否则就会报空指针！！研究了两天终于弄明白了。。。。
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