android 怎么看json数据格式

Posted 2023-03-09

给服务端发送请求后，服务端会返回一连串的数据，这些数据在大部分情况下都是XML格式或者JSON格式。然后JSON相对XML来说解析相对方便一些，所以先说说JSON的解析。
JSON的基本数据格式有这几种：
1.一个JSON对象——JSONObject
"name":"胡小威" , "age":20 , "male":true
2.一个JSON数组——JSONArray
["name":"胡小威" , "age":20 , "male":true,"name":"赵小亮" , "age":22 , "male":false]
3.复杂一点的JSONObject
"name":"胡小威", "age"=20, "male":true, "address":"street":"岳麓山南", "city":"长沙","country":"中国"
4.复杂一点的JSONArray
[
"name":"胡小威", "age"=20, "male":true, "address":"street":"岳麓山南", "city":"长沙","country":"中国",
"name":"赵小亮", "age"=22, "male":false, "address":"street":"九州港", "city":"珠海","country":"中国"
]
5.来个更复杂的，这是我从爱帮公交上扒取的数据
"buses":"bus":["last_foot_dist":"0","time":"37","segments":"segment":["line_name":"立珊专线(中南大学学生公寓-长沙火车站)","foot_dist":"362","stat_xys":"","stats":"岳麓山南;湖南师大;二里半;岳麓山北;市四医院;华图教育(太平街口);牛耳教育(南阳街口);韭菜园;曙光路口;长岛路口;长沙火车站","end_stat":"长沙火车站","line_xys":"","line_dist":"7535","start_stat":"岳麓山南"],"foot_dist":"362","dist":"7897","last_foot_dist":"0","time":"41","segments":"segment":["line_name":"旅1路(科教新村-长沙火车站)","foot_dist":"337","stat_xys":"","stats":"岳麓山南;湖南师大;二里半;岳麓山北;市四医院;华图教育(太平街口);蔡锷中路口;韭菜园;乔庄;曙光路口;长岛路口;五一东村;车站路口;长沙火车站","end_stat":"长沙火车站","line_xys":"","line_dist":"7822","start_stat":"岳麓山南"],"foot_dist":"337","dist":"8159"]

接下来是解析部分
一、直接解析
1."name":"胡小威" , "age":20 , "male":true

Java代码
public void parseJsonObject(String json)
try
JSONObject jsonObject = new JSONObject(json);
String name = jsonObject.getString("name");
int age = jsonObject.getInt("age");
boolean male = jsonObject.getBoolean("male");
//接下来该干嘛干嘛
catch (JSONException e)
// TODO Auto-generated catch block
e.printStackTrace();



2.["name":"胡小威" , "age":20 , "male":true,"name":"赵小亮" , "age":22 , "male":false]

Java代码
public void parseJSONArray(String json)
try
JSONArray jsonArray = new JSONArray(json);
for (int i = 0; i < jsonArray.length(); i++)
jsonObject = jsonArray.getJSONObject(i);
String name = jsonObject.getString("name");
int age = jsonObject.getInt("age");
boolean male = jsonObject.getBoolean("male");
//接下来该干嘛干嘛

catch (JSONException e)
// TODO Auto-generated catch block
e.printStackTrace();



3."name":"胡小威", "age"=20, "male":true, "address":"street":"岳麓山南", "city":"长沙","country":"中国"

Java代码
public void parseJsonPerson(String json)
try
JSONObject jsonObject = new JSONObject(json);
String name = jsonObject.getString("name");
int age = jsonObject.getInt("age");
boolean male = jsonObject.getBoolean("male");
JSONObject addressJSON = jsonObject.getJSONObject("address");
String street = addressJSON.getString("street");
String city = addressJSON.getString("city");
String country = addressJSON.getString("country");
Address address = new Address(street, city, country);
Person person = new Person(name, age, male, address);
catch (JSONException e)
// TODO Auto-generated catch block
e.printStackTrace();



4.
[
"name":"胡小威", "age"=20, "male":true, "address":"street":"岳麓山南", "city":"长沙","country":"中国",
"name":"赵小亮", "age"=22, "male":false, "address":"street":"九州港", "city":"珠海","country":"中国"
]

Java代码
public void parseJsonArrayPerson(String json)
List<Person> persons = new ArrayList<Person>();
try
jsonArray = new JSONArray(json);
for (int i = 0; i < jsonArray.length(); i++)
jsonObject = jsonArray.getJSONObject(i);
String name = jsonObject.getString("name");
int age = jsonObject.getInt("age");
boolean male = jsonObject.getBoolean("male");
JSONObject addressJSON = jsonObject.getJSONObject("address");
String street = addressJSON.getString("street");
String city = addressJSON.getString("city");
String country = addressJSON.getString("country");
Address address = new Address(street, city, country);
Person person = new Person(name, age, male, address);
persons.add(person);
Log.v("juno", person.toString());

catch (JSONException e)
// TODO Auto-generated catch block
e.printStackTrace();

Log.v("juno", persons.toString());


5. "buses":"bus":["last_foot_dist":"0","time":"37","segments":"segment":["line_name":"立珊专线(中南大学学生公寓-长沙火车站)","foot_dist":"362","stat_xys":"","stats":"岳麓山南;湖南师大;二里半;岳麓山北;市四医院;华图教育(太平街口);牛耳教育(南阳街口);韭菜园;曙光路口;长岛路口;长沙火车站","end_stat":"长沙火车站","line_xys":"","line_dist":"7535","start_stat":"岳麓山南"],"foot_dist":"362","dist":"7897","last_foot_dist":"0","time":"41","segments":"segment":["line_name":"旅1路(科教新村-长沙火车站)","foot_dist":"337","stat_xys":"","stats":"岳麓山南;湖南师大;二里半;岳麓山北;市四医院;华图教育(太平街口);蔡锷中路口;韭菜园;乔庄;曙光路口;长岛路口;五一东村;车站路口;长沙火车站","end_stat":"长沙火车站","line_xys":"","line_dist":"7822","start_stat":"岳麓山南"],"foot_dist":"337","dist":"8159"]

Java代码
public List<Salution> parseJSON(String str)
Log.d("返回的JSON数据：", str);
List<Salution> busList = new ArrayList<Salution>();

try
JSONObject jsonObject = new JSONObject(str);
JSONObject busesJSON = jsonObject.getJSONObject("buses");
JSONArray busJSArray=busesJSON.getJSONArray("bus");
for(int i=0;i<busJSArray.length();i++)
JSONObject busJSObject = busJSArray.getJSONObject(i);
JSONObject segsJSObject=busJSObject.getJSONObject("segments");
JSONArray segJSArray=segsJSObject.getJSONArray("segment");
Salution st=new Salution();

for(int j=0;j<segJSArray.length();j++)
if(j==0)
JSONObject segJSObject = segJSArray.getJSONObject(j);
st.setLine_name1(segJSObject.getString("line_name"));
Log.d("line_name", segJSObject.getString("line_name"));
st.setStats1(segJSObject.getString("stats"));
st.setEnd_stat1(segJSObject.getString("end_stat"));
st.setStart_stat1(segJSObject.getString("start_stat"));

if(j==1)
JSONObject segJSObject = segJSArray.getJSONObject(j);
st.setLine_name2(segJSObject.getString("line_name"));
Log.d("line_name", segJSObject.getString("line_name"));
st.setStats2(segJSObject.getString("stats"));
st.setEnd_stat2(segJSObject.getString("end_stat"));
st.setStart_stat2(segJSObject.getString("start_stat"));



busList.add(st);

return busList;
catch (JSONException e)
// TODO Auto-generated catch block
e.printStackTrace();

return null;


这里我只是简单获取了几个我想要的数据。

二、使用JSON类库Gson 来解析JSON
Gson 是 Google 提供的用来在 Java 对象和 JSON 数据之间进行映射的 Java 类库。可以将一个 JSON 字符串转成一个 Java 对象，或者反过来。

首先，从 code.google.com/p/google-gson/downloads/list下载GsonAPI

Java代码
google-gson-1.7.1-release.zip

再把gson-1.7.jar copy到libs
可以使用两种方法解析

①、通过获取JsonReader对象解析JSON数据：

Java代码
String jsonData = "[\\"username\\":\\"arthinking\\",\\"userId\\":001,\\"username\\":\\"Jason\\",\\"userId\\":002]";
try
JsonReader reader = new JsonReader(new StringReader(jsonData));
reader.beginArray();
while(reader.hasNext())
reader.beginObject();
while(reader.hasNext())
String tagName = reader.nextName();
if(tagName.equals("username"))
System.out.println(reader.nextString());

else if(tagName.equals("userId"))
System.out.println(reader.nextString());


reader.endObject();

reader.endArray();

catch(Exception e)
e.printStackTrace();


②、通过把JSON数据映射成一个对象，使用Gson对象的fromJson()方法获取一个对象数组进行操作
Java代码
Type listType = new TypeToken<LinkedList<User>>().getType();
Gson gson = new Gson();
LinkedList<User> users = gson.fromJson(jsonData, listType);
for (Iterator iterator = users.iterator(); iterator.hasNext();)
User user = (User) iterator.next();
System.out.println(user.getUsername());
System.out.println(user.getUserId());


我一般是采用直接解析，添加类库神马的最讨厌了···
还有，抱怨一下，iteye的编辑弱爆了！！！

转载 参考技术A

JSON有两种表示结构，对象和数组。

对象结构以””大括号开始，以””大括号结束。中间部分由0或多个以”，”分隔的”key(关键字)/value(值)”对构成，关键字和值之间以”：”分隔，语法结构如下

key1:value1,

key2:value2,

其中关键字是字符串，而值可以是字符串，数值，true,false,null,对象或数组

数组结构以”[”开始，”]”结束。中间由0或多个以”，”分隔的值列表组成，语法结构如下

[

key1:value1,

key2:value2

,

key3:value3,

key4:value4

]

给服务端发送请求后，服务端会返回一连串的数据，这些数据在大部分情况下都是XML格式或者JSON格式。然后JSON相对XML来说解析相对方便一些，所以先说说JSON的解析。

JSON的基本数据格式有这几种：

1.一个JSON对象——JSONObject

"name":"胡小威" , "age":20 , "male":true

2.一个JSON数组——JSONArray

["name":"胡小威" , "age":20 , "male":true,"name":"赵小亮" , "age":22 , "male":false]

3.复杂一点的JSONObject

"name":"胡小威", "age"=20, "male":true, "address":"street":"岳麓山南", "city":"长沙","country":"中国"

4.复杂一点的JSONArray

[

"name":"胡小威", "age"=20, "male":true, "address":"street":"岳麓山南", "city":"长沙","country":"中国",

"name":"赵小亮", "age"=22, "male":false, "address":"street":"九州港", "city":"珠海","country":"中国"

]

参考技术B

JSON有两种表示结构，对象和数组。
对象结构以””大括号开始，以””大括号结束。中间部分由0或多个以”，”分隔的”key(关键字)/value(值)”对构成，关键字和值之间以”：”分隔，语法结构如下

    key1:value1,
    key2:value2,

其中关键字是字符串，而值可以是字符串，数值，true,false,null,对象或数组

数组结构以”[”开始，”]”结束。中间由0或多个以”，”分隔的值列表组成，语法结构如下

[
    
        key1:value1,
        key2:value2 
    ,
    
         key3:value3,
         key4:value4   
    
]

参考技术C android的json解析部分都在包org.json下