一、json文件生成
Gson下載地址:http://code.google.com/p/google-gson/
1、簡單json文件生成
首先要有一個java對象類,其中成員與json中條目相對應。我這裏創建一個User類用於存放姓名,年齡信息。
public class User {
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
然後生成json字符串:
Gson gson = new Gson();
User user = new User();
user.setName("wubin");
user.setAge(23);
String json = gson.toJson(user);
Log.i("tojson_json", json);
打印出來的json格式字符串爲:
{"name":"wubin","age":23}
2、數組json文件生成
創建User數組
Gson gson = new Gson();
User[] users = new User[3];
for (int i = 0; i < users.length; i++) {
users[i] = new User();
users[i].setName("wubin"+i);
users[i].setAge(24+i);
}
String json = gson.toJson(users);
Log.i("tojson_json", json);
打印出json字符串爲:
[{"name":"wubin0","age":24},{"name":"wubin1","age":25},{"name":"wubin2","age":26}]
二、json文件解析
1、Gson解析
簡單json解析
String json1 = "{\"name\":\"wubin\",\"age\":23}";
Gson gson = new Gson();
User user = gson.fromJson(json1, User.class);
數組json解析
String json2 = "[{\"name\":\"wubin\",\"age\":23},{\"name\":\"wubin\",\"age\":24}]";
Gson gson = new Gson();
Type listType=new TypeToken<LinkedList<User>>(){}.getType();
LinkedList<User> users=gson.fromJson(json2, listType);
for(Iterator<User> iterator=users.iterator();iterator.hasNext();){
User user=(User)iterator.next();
Log.i("json_name", "name = " + user.getName());
Log.i("json_age", "age = " + user.getAge());
}
2、傳統jsonReader解析