JSON的基本数据格式有这几种：
- 一个JSON对象——JSONObject
{"name":"胡小威" , "age":20 , "male":true}
- 一个JSON数组——JSONArray
[{"name":"胡小威" , "age":20 , "male":true},{"name":"赵小亮" , "age":22 , "male":false}]
- 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"}
}
- 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"}}
]
- 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
- {"name":"胡小威" , "age":20 , "male":true}
java:
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)
{
e.printStackTrace();
}
}
js:
success: function(result)
{
var name = result.name;
var age = result.age;
var male = result.male;
}- [{"name":"胡小威" , "age":20 , "male":true},{"name":"赵小亮" , "age":22 , "male":false}]
java:
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)
{
e.printStackTrace();
}
}
js:
success : function(result)
{
for( var key in result )
{
var data = new Object();
data = result[key];
var name = data.name;
var age = data.age;
var male = data.male;
}
}
- {"name":"胡小威", "age"=20, "male":true, "address":{"street":"岳麓山南", "city":"长沙","country":"中国"}}
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)
{
e.printStackTrace();
}
}
- [{"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"}}]
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)
{
e.printStackTrace();
}
Log.v("juno", persons.toString());
}
- {"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"}]}}
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;
}
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。
maven添加gson依赖包
<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.10.1</version>
</dependency>
可以使用两种方法解析
1.通过获取JsonReader对象解析JSON数据：
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
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());
}
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