几种不同格式的json解析

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}

 

public void parseJsonObject(String json) {
try {
new JSONObject(json);
"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
        }
    }

 

 

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

 

 

public void parseJSONArray(String json) {
try {
new JSONArray(json);
for (int i = 0; i < jsonArray.length(); 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
        }
    }

  

 

3.{"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 {
new JSONObject(json);
"name");
int age = jsonObject.getInt("age");
boolean male = jsonObject.getBoolean("male");
"address");
"street");
"city");
"country");
new Address(street, city, country);
new Person(name, age, male, address);
catch (JSONException e) {
// TODO Auto-generated catch block
        }
    }

 

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"}}

]

 

 

 

public void parseJsonArrayPerson(String json) {
new ArrayList<Person>();
try {
new JSONArray(json);
for (int i = 0; i < jsonArray.length(); i++) {
                String name = jsonObject.getString("name");
int age = jsonObject.getInt("age");
boolean male = jsonObject.getBoolean("male");
"address");
"street");
"city");
"country");
new Address(street, city, country);
new Person(name, age, male, address);
                Log.v("juno", person.toString());
        } catch (JSONException e) {
// TODO Auto-generated catch block
        }
"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"}]}}

 

public List<Salution> parseJSON(String str){
"返回的JSON数据：", str);
new ArrayList<Salution>();
        try {
new JSONObject(str);
"buses");
"bus");
for(int i=0;i<busJSArray.length();i++){
                JSONObject segsJSObject=busJSObject.getJSONObject("segments");
"segment");
new Salution();
                    for(int j=0;j<segJSArray.length();j++){
if(j==0){
                            st.setLine_name1(segJSObject.getString("line_name"));
"line_name", segJSObject.getString("line_name"));
"stats"));
"end_stat"));
"start_stat"));
                        if(j==1){
                            st.setLine_name2(segJSObject.getString("line_name"));
"line_name", segJSObject.getString("line_name"));
"stats"));
"end_stat"));
"start_stat"));
                    }
                    busList.add(st);
            return busList;
catch (JSONException e) {
// TODO Auto-generated catch block
        }
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

 

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：

 

"[{\"username\":\"arthinking\",\"userId\":001},{\"username\":\"Jason\",\"userId\":002}]";
try{
new JsonReader(new StringReader(jsonData));
    while(reader.hasNext()){
        while(reader.hasNext()){
            if(tagName.equals("username")){
            }
else if(tagName.equals("userId")){
            }
        reader.endObject();
    reader.endArray();
catch(Exception e){
}

 

 

 

 

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

new TypeToken<LinkedList<User>>(){}.getType();
new Gson();
for (Iterator iterator = users.iterator(); iterator.hasNext();) {
    System.out.println(user.getUsername());
}