使用GSON读取和写入数据 [英] read and write data with GSON
本文介绍了使用GSON读取和写入数据的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在努力寻找一个关于如何在我的android应用程序中使用GSON读取和写入数据的好例子。有人可以指给我看一个好例子吗?
我的教授给出了这个例子来写作:
Vector v = new Vector(10.0f,20.0f);
Gson gson = new Gson();
String s = gson.toJson(v);
我会如何将其保存到文件中?
> String filename =myfile.txt;
Vector v = new Vector(10.0f,20.0f);
Gson gson = new Gson();
String s = gson.toJson(v);
FileOutputStream outputStream;
尝试{
outputStream = openFileOutput(filename,Context.MODE_PRIVATE);
outputStream.write(s.getBytes());
outputStream.close();
} catch(Exception e){
e.printStackTrace();
}
如何读回:
FileInputStream fis = context.openFileInput(myfile.txt,Context.MODE_PRIVATE);
InputStreamReader isr = new InputStreamReader(fis);
BufferedReader bufferedReader = new BufferedReader(isr);
StringBuilder sb = new StringBuilder();
字符串行; ((line = bufferedReader.readLine())!= null){
sb.append(line);
while
}
String json = sb.toString();
Gson gson = new Gson();
Vector v = gson.fromJson(json,Vector.class);
I am struggling to find a good example on how to read and write data in my android app using GSON. Could someone please show me or point me to a good example? I am using this for data persistence between activities.
My professor gave this example to for writing:
Vector v = new Vector(10.0f, 20.0f);
Gson gson = new Gson();
String s = gson.toJson(v);
How would I go about saving that to a file?
解决方案
How to save your JSON into a file on internal storage:
String filename = "myfile.txt";
Vector v = new Vector(10.0f, 20.0f);
Gson gson = new Gson();
String s = gson.toJson(v);
FileOutputStream outputStream;
try {
outputStream = openFileOutput(filename, Context.MODE_PRIVATE);
outputStream.write(s.getBytes());
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
How to read it back:
FileInputStream fis = context.openFileInput("myfile.txt", Context.MODE_PRIVATE);
InputStreamReader isr = new InputStreamReader(fis);
BufferedReader bufferedReader = new BufferedReader(isr);
StringBuilder sb = new StringBuilder();
String line;
while ((line = bufferedReader.readLine()) != null) {
sb.append(line);
}
String json = sb.toString();
Gson gson = new Gson();
Vector v = gson.fromJson(json, Vector.class);
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