如何從原始文件夾中獲取json文件？

Question

我想用我的user.json這是我的原始文件夾中得到一個新的文件：

// read from file, convert it to user class 
User user = mapper.readValue(new File(**R.raw.user**), User.class); 

我發現的InputStream可以做到這一點：

InputStream ins = res.openRawResource(
         getResources().getIdentifier("raw/user", 
           "raw", getPackageName())); 

有沒有更好的辦法做到這一點，直接與我的json文件ID？

Answer 1

ObjectMapper.readValue也取InputStream作爲來源。從使用JSON文件openRawResource方法獲取InputStream，並把它傳遞給readValue：

InputStream in = getResources().openRawResource(R.raw.user); 
User user = mapper.readValue(in, User.class); 

Answer 2

InputStream is = getResources().openRawResource(R.raw.json_file); 
Writer writer = new StringWriter(); 
char[] buffer = new char[1024]; 
try { 
    Reader reader = new BufferedReader(new InputStreamReader(is, "UTF-8")); 
    int n; 
    while ((n = reader.read(buffer)) != -1) { 
     writer.write(buffer, 0, n); 
    } 
} finally { 
    is.close(); 
} 

String jsonString = writer.toString();