java json解析（轉）

時間  2019-12-13
標籤 java json 解析 欄目 Java 简体版
原文   原文鏈接

轉自：http://www.javashuo.com/article/p-opahcopi-cz.htmlhtml

 

給服務端發送請求後，服務端會返回一連串的數據，這些數據在大部分狀況下都是XML格式或者JSON格式。而後JSON相對XML來講解析相對方便一些，因此先說說JSON的解析。json

JSON的基本數據格式有這幾種：數組

1.一個JSON對象——JSONObjectgoogle

{"name":"胡小威" , "age":20 , "male":true}spa

2.一個JSON數組——JSONArraycode

[{"name":"胡小威" , "age":20 , "male":true},{"name":"趙小亮" , "age":22 , "male":false}]htm

3.複雜一點的JSONObject對象

{"name":"胡小威", "age"=20, "male":true, "address":{"street":"嶽麓山南", "city":"長沙","country":"中國"}}blog

4.複雜一點的JSONArrayip

[

{"name":"胡小威", "age"=20, "male":true, "address":{"street":"嶽麓山南", "city":"長沙","country":"中國"}},

{"name":"趙小亮", "age"=22, "male":false, "address":{"street":"九州港", "city":"珠海","country":"中國"}}

]

5.來個更復雜的，這是我從愛幫公交上扒取的數據

 {"buses":{"bus":[{"last_foot_dist":"0","time":"37","segments":{"segment":[{"line_name":"立珊專線(中南大學學生公寓-長沙火車站)","foot_dist":"362","stat_xys":"","stats":"嶽麓山南;湖南師大;二里半;嶽麓山北;市四醫院;華圖教育(太平街口);牛耳教育(南陽街口);韭菜園;曙光路口;長島路口;長沙火車站","end_stat":"長沙火車站","line_xys":"","line_dist":"7535","start_stat":"嶽麓山南"}]},"foot_dist":"362","dist":"7897"},{"last_foot_dist":"0","time":"41","segments":{"segment":[{"line_name":"旅1路(科教新村-長沙火車站)","foot_dist":"337","stat_xys":"","stats":"嶽麓山南;湖南師大;二里半;嶽麓山北;市四醫院;華圖教育(太平街口);蔡鍔中路口;韭菜園;喬莊;曙光路口;長島路口;五一東村;車站路口;長沙火車站","end_stat":"長沙火車站","line_xys":"","line_dist":"7822","start_stat":"嶽麓山南"}]},"foot_dist":"337","dist":"8159"}]}}

 

接下來是解析部分

1、直接解析

1.{"name":"胡小威" , "age":20 , "male":true}

複製代碼 
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");  
            //接下來該幹嗎幹嗎  
        } catch (JSONException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }  
    }
複製代碼

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

複製代碼 
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");  
                //接下來該幹嗎幹嗎  
            }  
        } catch (JSONException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }  
    }
複製代碼

3.{"name":"胡小威", "age"=20, "male":true, "address":{"street":"嶽麓山南", "city":"長沙","country":"中國"}}

 

複製代碼 
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();  
        }  
    }
複製代碼

4.

[

{"name":"胡小威", "age"=20, "male":true, "address":{"street":"嶽麓山南", "city":"長沙","country":"中國"}},

{"name":"趙小亮", "age"=22, "male":false, "address":{"street":"九州港", "city":"珠海","country":"中國"}}

]

複製代碼 
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());  
    }
複製代碼

5. {"buses":{"bus":[{"last_foot_dist":"0","time":"37","segments":{"segment":[{"line_name":"立珊專線(中南大學學生公寓-長沙火車站)","foot_dist":"362","stat_xys":"","stats":"嶽麓山南;湖南師大;二里半;嶽麓山北;市四醫院;華圖教育(太平街口);牛耳教育(南陽街口);韭菜園;曙光路口;長島路口;長沙火車站","end_stat":"長沙火車站","line_xys":"","line_dist":"7535","start_stat":"嶽麓山南"}]},"foot_dist":"362","dist":"7897"},{"last_foot_dist":"0","time":"41","segments":{"segment":[{"line_name":"旅1路(科教新村-長沙火車站)","foot_dist":"337","stat_xys":"","stats":"嶽麓山南;湖南師大;二里半;嶽麓山北;市四醫院;華圖教育(太平街口);蔡鍔中路口;韭菜園;喬莊;曙光路口;長島路口;五一東村;車站路口;長沙火車站","end_stat":"長沙火車站","line_xys":"","line_dist":"7822","start_stat":"嶽麓山南"}]},"foot_dist":"337","dist":"8159"}]}}

複製代碼 
public List<Salution> parseJSON(String str){  
        Log.d("返回的JSON數據：", 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;  
    }
複製代碼

 這裏我只是簡單獲取了幾個我想要的數據。

 

2、使用JSON類庫Gson 來解析JSON

Gson 是 Google 提供的用來在 Java 對象和 JSON 數據之間進行映射的 Java 類庫。能夠將一個 JSON 字符串轉成一個 Java 對象，或者反過來。

 

首先，從 code.google.com/p/google-gson/downloads/list下載GsonAPI

google-gson-1.7.1-release.zip  

 

 再把gson-1.7.jar copy到libs

能夠使用兩種方法解析

 

①、經過獲取JsonReader對象解析JSON數據：

複製代碼 
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();  
}
複製代碼

②、經過把JSON數據映射成一個對象，使用Gson對象的fromJson()方法獲取一個對象數組進行操做

複製代碼 
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());  
}
複製代碼
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