如何从原始文件夹中获取json文件？

Question

我想使用我的raw文件夹中的user.json来获取一个新文件:

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

我发现InputStream可以这样做:

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

有没有更好的方法来直接使用我的json文件ID？

Answer 1

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();

Answer 2

ObjectMapper.readValue也InputStream作为来源。从json文件获取InputStream使用openRawResource方法，并将其传递给readValue：

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