如何将Map对象写入文件 [英] How to write a Map object to a file

问题描述

我想从Map对象写入文件.这是我的尝试.

I want to write to a file from a Map object. Here is my attempt.

try {
    stuMap.put(student.getId(), student);
    Path file = Paths.get("student.txt");  // to create the file 
    Files.write(file, stuMap, Charset.forName("UTF-8"));  // try to save in the file 
    /*  fileReaderWriter.createFileIn_NIO(stuMap);*/
    try {
        fileReaderWriter.createFileIn_NIO(stuMap);
    } catch (IOException ex) {
        System.out.println("file not saved");
    }
    return true;
} catch (Exception ex) {
    System.out.println("not stored in Map");
    return false;
}

我如何进行这项工作?

推荐答案

解决此问题的简单方法是使用Gson库:

A simple variant to solve the problem is to use Gson library:

    String str = new Gson().toJson(yourMap);
    File file = new File(fileName);
    try(FileOutputStream stream = new FileOutputStream(file)) {
        file.createNewFile();
        stream.write(str.getBytes());
    }catch (IOException e){
        System.out.println("can't write to file");
    }

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