FileReader找不到我的文本文件

时间:2014-03-23 00:44:52

标签: java filereader java-io

我有一个简单的文本文件,由于某种原因,它无法找到。我没有看到代码有什么问题,因为我是从网站上得到的,我开始认为我没有将文本文件放在正确的位置。有什么建议吗?

代码:

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.nio.file.Path;
import java.nio.file.Paths;

public class MainFavorites {
    public static void main(String[] args) throws IOException {
        /**
        * finds pathway to the file
        */
        //      File file = new File("icecreamTopping.txt");
        //      System.out.println(file.getCanonicalPath());

        BufferedReader reader = null;
        ArrayList <String> myFileLines = new ArrayList <String>();
        try {
            String sCurrentLine;
            reader = new BufferedReader(new FileReader("icecreamTopping.txt"));
            while ((sCurrentLine = reader.readLine()) != null) {
                //System.out.println(sCurrentLine);
                myFileLines.add(sCurrentLine);
            }
        } catch (IOException e) {
            e.printStackTrace();
            System.out.print(e.getMessage());
        } finally {
            try {
                if (reader != null)reader.close();
            } catch (IOException ex) {
                System.out.println(ex.getMessage());
                ex.printStackTrace();
            }
        }
        int numElements = myFileLines.size();
        System.out.println ("there are n lines in the file:" + numElements);

        for (int counter = numElements-1; counter >= 0; counter--) {
            String mylineout = myFileLines.get(counter);
            System.out.println (mylineout);
        }
    }
}

文件内容:

1- Blueberry 
2- Banana Buzz
3- Cookie Batter

我的堆栈跟踪是这样的:

java.io.FileNotFoundException: C:\Users\homar_000\workspace\RankFavorites\icecreamTopping.txt (The system cannot find the file specified)
at java.io.FileInputStream.open(Native Method) at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileReader.<init>(Unknown Source)
at MainFavorites.main(MainFavorites.java:28)

4 个答案:

答案 0 :(得分:8)

替换下面的行

reader = new BufferedReader(new FileReader("icecreamTopping.txt"));

reader = new BufferedReader(new FileReader("resources/icecreamTopping.txt"));

并将该文件放在与src文件夹并行的资源文件夹下。


示例代码:

从资源文件夹

中读取文件abc.txt
reader = new BufferedReader(new FileReader("resources/abc.txt"));

这是项目结构

enter image description here


尝试以下代码,找出它指向文件icecreamTopping.txt的位置。

 File f=new File("icecreamTopping.txt");
 System.out.println(f.getAbsolutePath());

获取绝对路径后,只需将文件放在那里。


- 编辑 -

根据您上次的评论,将icecreamTopping.txt文件直接放在项目RankFavorites中,如下面的快照所示,它肯定会解决您的问题。

enter image description here

答案 1 :(得分:4)

发现问题所在。我没有必要放置文件扩展名,所以我删除了.txt,因为当我保留它时,它将其读作&#34; icecreamTopping.txt.txt&#34;

答案 2 :(得分:-1)

尝试使用File类检测存储中的文件:

File sdcard = Environment.getExternalStorageDirectory();

//Get the text file
File file = new File(sdcard,"file.txt");

BufferedReader br = new BufferedReader(new FileReader(file));

答案 3 :(得分:-2)

import org.json.simple.parser.ParseException;
import org.json.simple.parser.JSONParser;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;


JSONParser parser = new JSONParser();
ObjectMapper mapper = new ObjectMapper();

try {
    
    Object obj = parser.parse(new FileReader("/home/sahan/Desktop/data.json"));
    ObjectNode objNode = mapper.convertValue(obj, ObjectNode.class);
    System.out.println(objNode);

} catch (FileNotFoundException e) {
    e.printStackTrace();
} catch (ParseException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}