Question

我通过eclipse将文本文件导入到我的java项目文件夹中。我正在尝试加载包含随机单词字典的文本，浏览它们并创建一个hashmap，其中单词的第一个字母是键，单词作为整体是值。

我在WordStore类中有一个方法：

public WordStore(String k) throws IOException {
    map = new HashMap<String, List<String>>();
    BufferedReader buffread = null;
    File filename = null;
    FileReader fread = null;
    try{
        filename = new File(k);
        fread = new FileReader(filename);
        buffread = new BufferedReader(fread);   
        String word ="";

        while((word = buffread.readLine()) != null) {
            if(word.length()<3) {
            //don't add word less than 3 characters long
            }
            else {
                String key = ""+(word.charAt(0));
                put(key, word);
            }

        }

    }
    catch(IOException e) {
        System.out.println("File not found exception caught!");
    }
    finally {
        if(buffread != null) {
            try {
                buffread.close();
            }
        catch(IOException e) {
            e.printStackTrace();
        }
        }
    }

}

我在WordStoreTest类中使用它：

import java.io.IOException;

public class WordStoreTest {

public static void main(String[] args) throws IOException {
    WordStore store = new WordStore("nouns.txt");
    System.out.println(store.getRandomWord("b"));

}

}

例外：

File not found exception caught! java.io.FileNotFoundException: nouns.txt (No such file or directory
 at java.io.FileInputStream.open0(Native Method
 at java.io.FileInputStream.open(FileInputStream.java:195
 at java.io.FileInputStream.(FileInputStream.java:138
 at java.io.FileReader.(FileReader.java:72
 at WordStore.(WordStore.java:34
 at WordStoreTest.main(WordStoreTest.java:14) null

Answer 1

要访问项目结构中的文件，您需要重新创建从项目根目录到文件本身的路径。

假设文件位于src文件夹中，例如

PROJECT
 |
  src
   |
    nouns.txt
    aPackage
      |
       Main.java

以下代码成功：

public class Main {
  public static void main(String[] args) {
     System.out.println(Files.exists(Paths.get("src", "nouns.txt")));
 }
}

Answer 2

我总是使用BufferedReader而不是从File获取InputStream。例如，您可以这样做：

String path = "/nouns.txt";
try {
    InputStream is = this.getClass().getResourceAsStream("/misc/sample.txt");
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is, "UTF-8"));


    String line = bufferedReader.readLine();
    for(; line!=null; line=bufferedReader.readLine()) {
        System.out.println(line);
    }


    bufferedReader.close();
} catch (IOException e) {
    e.printStackTrace();
}

当然，此处的路径假定您的txt文件位于src下，而不是包，但您可以随时更改。您甚至可以创建第二个源文件夹并将其放在那里。

为什么我找不到文件异常？

2 个答案: