如何将HashSet <String>保存为.txt？

Question

我想将HashSet存储到服务器目录中.但我现在只能将它存储在.bin文件中.但是如何将HashSet中的所有Key打印到.txt文件？

static Set<String> MapLocation = new HashSet<String>();

    try {
        SLAPI.save(MapLocation, "MapLocation.bin");
    } catch (Exception ex) {

    }

public static void save(Object obj, String path) throws Exception {
    ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(
            path));
    oos.writeObject(obj);
    oos.flush();
    oos.close();
}

Answer 1

// check IOException in method signature
BufferedWriter out = new BufferedWriter(new FileWriter(path));
Iterator it = MapLocation.iterator(); // why capital "M"?
while(it.hasNext()) {
    out.write(it.next());
    out.newLine();
}
out.close();

Answer 2

这会将字符串保存到UTF-8文本文件中：

public static void save(Set<String> obj, String path) throws Exception {
    PrintWriter pw = null;
    try {
        pw = new PrintWriter(
            new OutputStreamWriter(new FileOutputStream(path), "UTF-8"));
        for (String s : obj) {
            pw.println(s);
        }
        pw.flush();
    } finally {
        pw.close();
    }
}

特别需要选择UTF-8，因为否则它将使用操作系统使用的默认设置作为默认设置，这将给您带来兼容性问题。