Java 如何在try/catch块外部引用BufferReader变量

我正在尝试将res/raw/中的csv文件读入SQLite数据库。以下是我的功能：

public void updateDatabase(Context context, SQLiteDatabase database) {

    InputStream inputStream = context.getResources().openRawResource(R.raw.teamlist);
    try {
        BufferedReader buffer = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
    } catch (UnsupportedEncodingException ioe) {
        Log.e("ERROR", "Could not load " + ioe);
    }

    String line = "";

    database.beginTransaction();
    try {
        while ((line = buffer.readLine()) != null) {
            // read each line from CSV file into a database

        }
    } catch (IOException ioe){
        Log.e("ERROR", "Could not load " + ioe);
    }
    database.setTransactionSuccessful();
    database.endTransaction();
}

---

但我在while循环中得到错误“无法解析符号‘buffer’”。如何在try函数外部引用BufferReader？我尝试使用“null”在try块外初始化缓冲区读取器，但这导致我的应用程序崩溃。有什么建议吗？

不要这样写代码。更正确的书写方式是：

public void updateDatabase(Context context, SQLiteDatabase database) {

    try (InputStream inputStream = context.getResources().openRawResource(R.raw.teamlist);
        BufferedReader buffer = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));) {

        String line;
        database.beginTransaction();
        while ((line = buffer.readLine()) != null) {
            // read each line from CSV file into a database

        }
        database.setTransactionSuccessful();
        database.endTransaction();
    } catch (IOException ioe){
        Log.e("ERROR", "Could not load " + ioe);
    } catch (UnsupportedEncodingException ioe) {
        Log.e("ERROR", "Could not load " + ioe);
    }
}

总之，取决于先前

try

块中代码成功与否的代码应该位于该

try

块中。不要像以前那样编写字符串

try/catch

语句

---

请注意，这也解决了输入流上的资源泄漏问题，并且不需要初始化

行

变量。

是有意义的。我来换一下，试试看。谢谢你的建议！