【重拾Android】（1）使用gson解析json数据
废话不多说,先来看一下复杂json格式的数据
{
"data": {
"picsize": "",
"blogs": [
{
"photo_id": 19569850,
"unm": "XXXXL桔子",
"uid": 3149731,
"cmts": [
{
"ava": "http://img4.duitang.com/uploads/files/201312/19/20131219204737_XVinc.jpeg",
"cont": "喜欢",
"id": 2445206,
"name": "巴黎-卢浮宫"
},
{
"ava": "http://img4.duitang.com/uploads/people/201311/16/20131116083610_BCeyB.thumb.24_24_c.jpeg",
"cont": "真的好棒>O<",
"id": 1948213,
"name": "雪糕冻儿"
}
],
"good": false,
"common": false,
"price": 0,
"rid": 169557009,
"buylnk": "",
"zanc": 8,
"sta": 0,
"ava": "http://img5.duitang.com/uploads/people/201407/15/20140715173822_yEt4L.thumb.24_24_c.jpeg",
"coupon_price": 0,
"albnm": "家居创意",
"iwd": 500,
"iht": 674,
"albid": 58736725,
"favc": 127,
"tid": null,
"ruid": 3149731,
"id": 169557009,
"repc": 2,
"isrc": "http://img4.duitang.com/uploads/blog/201407/24/20140724140503_df2Wr.thumb.224_0.jpeg",
"msg": "这是一对平时工作忙碌的夫妇第二个家，他们特别喜爱水，这间度假别墅让他们的身心得以放松，在这里像在云端畅游一般。粗犷休闲的装饰使得环境变得更加轻松。门前的阶梯把人引向户外生活，湖泊、小树林围绕这个开放而轻松的别墅，屋内陈设让其更加熠熠生辉。"
},
{
"photo_id": 19569828,
"unm": "XXXXL桔子",
"uid": 3149731,
"cmts": [],
"good": false,
"common": false,
"price": 0,
"rid": 169556836,
"buylnk": "",
"zanc": 2,
"sta": 0,
"ava": "http://img5.duitang.com/uploads/people/201407/15/20140715173822_yEt4L.thumb.24_24_c.jpeg",
"coupon_price": 0,
"albnm": "家居创意",
"iwd": 500,
"iht": 348,
"albid": 58736725,
"favc": 35,
"tid": null,
"ruid": 3149731,
"id": 169556836,
"repc": 0,
"isrc": "http://img4.duitang.com/uploads/blog/201407/24/20140724140442_xrneS.thumb.224_0.jpeg",
"msg": "国外度假别墅"
}
],
"hasrp": true,
"has_next": true,
"pgsource": "ad_",
"first_blog": {
"photo_id": 19569850,
"unm": "XXXXL桔子",
"uid": 3149731,
"cmts": [
{
"ava": "http://img4.duitang.com/uploads/files/201312/19/20131219204737_XVinc.jpeg",
"cont": "喜欢",
"id": 2445206,
"name": "巴黎-卢浮宫"
},
{
"ava": "http://img4.duitang.com/uploads/people/201311/16/20131116083610_BCeyB.thumb.24_24_c.jpeg",
"cont": "真的好棒>O<",
"id": 1948213,
"name": "雪糕冻儿"
}
],
"good": false,
"common": false,
"price": 0,
"rid": 169557009,
"buylnk": "",
"zanc": 8,
"sta": 0,
"ava": "http://img5.duitang.com/uploads/people/201407/15/20140715173822_yEt4L.thumb.24_24_c.jpeg",
"coupon_price": 0,
"albnm": "家居创意",
"iwd": 500,
"iht": 674,
"albid": 58736725,
"favc": 127,
"tid": null,
"ruid": 3149731,
"id": 169557009,
"repc": 2,
"isrc": "http://img4.duitang.com/uploads/blog/201407/24/20140724140503_df2Wr.thumb.224_0.jpeg",
"msg": "这是一对平时工作忙碌的夫妇第二个家，他们特别喜爱水，这间度假别墅让他们的身心得以放松，在这里像在云端畅游一般。粗犷休闲的装饰使得环境变得更加轻松。门前的阶梯把人引向户外生活，湖泊、小树林围绕这个开放而轻松的别墅，屋内陈设让其更加熠熠生辉。"
},
"coupon": false,
"nopth": true
},
"success": true
}
看似复杂，但是解析起来并不困难，由于我们只需要"blogs"里面的数据，所以我们要先建立数据实体类，数据实体类中并不是每个属性都需要有，这里只选用我们需要用到的属性。
public class PhotoInfo implements Serializable{
private String photo_id;
private String isrc;
private String msg;
private int iwd;
private int iht;
public String getPhoto_id() {
return photo_id;
}
public void setPhoto_id(String photo_id) {
this.photo_id = photo_id;
}
public String getIsrc() {
return isrc;
}
public void setIsrc(String isrc) {
this.isrc = isrc;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public int getIwd() {
return iwd;
}
public void setIwd(int iwd) {
this.iwd = iwd;
}
public int getIht() {
return iht;
}
public void setIht(int iht) {
this.iht = iht;
}
}
解析过程如下：
//json是json格式的String
SONObject newsObject = new JSONObject(json);
//解嵌套,获取data中的数据，这里面只有一个数据
JSONObject jsonObject = newsObject.getJSONObject("data");
//解嵌套,获取blogs中的数据,注意这里是多个数据
JSONArray blogsJson = jsonObject.getJSONArray("blogs");
//泛型
Type listType = new TypeToken<LinkedList<PhotoInfo>>(){}.getType();
Gson gson = new Gson();
//将blogsJson转化成String并解析即可
ps = gson.fromJson(blogsJson.toString(), listType);
因为数据较复杂，我这里先使用
JSONObject进行解嵌套，再使用Gson通过反射直接生成对象，简单方便，
也可以直接通过嵌套定义的类来生成对象。如下所示：
JSON格式数据
{
"user_get_response": {
"user": {
"buyer_credit": {
"good_num": 0,
"level": 0,
"score": 0,
"total_num": 0
},
"created": "2009-09-30 13:15:54",
"last_visit": "2009-12-22 13:31:58",
"location": {},
"nick": "sandbox_c_23",
"seller_credit": {
"good_num": 0,
"level": 0,
"score": 0,
"total_num": 0
}
}
}
JAVA代码
class Address {
String street;
String city;
String province;
String country;
public Address() {};
public String toString() {return street;}
}
class CreditInfo {
int good_num;
int level;
int score;
int total_num;
public CreditInfo() {};
public String toString() {
return String.format("[good_num: %1$s, level: %2$s, score: %3$s, total_num: %4$s]", good_num, level, score, total_num);
}
}
class User {
CreditInfo buyer_credit;
Date created;
Date last_visit;
Address location;
String nick;
CreditInfo seller_credit;
public User() {buyer_credit=new CreditInfo(); seller_credit=new CreditInfo();}
public String toString() {
return String.format("buyer_credit: %1$s, \ncreated: %2$s, \nlast_visit: %3$s, \nlocation: %4$s, \nnick: %5$s, \nseller_credit: %6$s",
buyer_credit,
created,
last_visit,
location,
nick,
seller_credit);
}
}
class UserResponse {
User user;
public UserResponse() {}
public String toString() {return "user = " + user;}
}
class Response {
UserResponse user_get_response;
public Response() {}
public String toString() {return user_get_response.toString();}
}
public class Test {
public static void main(String[] args) {
String s = "{\"user_get_response\":{\"user\":{\"buyer_credit\":{\"good_num\":0,\"level\":0,\"score\":0,\"total_num\":0},\"created\":\"2009-09-30 13:15:54\",\"last_visit\":\"2009-12-22 13:31:58\",\"location\":{},\"nick\":\"sandbox_c_23\",\"seller_credit\":{\"good_num\":0,\"level\":0,\"score\":0,\"total_num\":0}}}}";
Gson gson = new Gson();
Response r = gson.fromJson(s, Response.class);
System.out.println(r);
}
}
{
"total": 100,
"rows": [
{
"key": "key1",
"value": "value1"
},
{
"key": "key2",
"value": "value2"
}
]
}
- public class A{
- public string key;
- public string value;
- }
- public class B {
- public int total;
- public List<A> rows;
- }
- Type type = new TypeToken<B>().getType();
- Gson gson = new Gson();
- B b = gson.fromJson(json, type);
参考链接：
http://www.cnblogs.com/jxgxy/p/3677256.html