使用InputStream读取文本文件

Question

我该如何在安卓应用中读取文本文件：

"1.something written
2.in this file
3.is to be read by
4.the InputStream
..."

这样我就可以获得一个类似于字符串的返回值：

"something written\nin this file\nis to be read by\nthe InputStream"

我所想的是（伪代码）：

make an inputstream
is = getAssest().open("textfile.txt");  //in try and catch
for loop{
string = is.read() and if it equals "." (i.e. from 1., 2., 3. etc) add "/n" ...
}

- RE60K

Answer 1

试试这个

import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;
import java.io.*;

public class FileDemo1 extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        try {
            playWithRawFiles();
        } catch (IOException e) {
            Toast.makeText(getApplicationContext(), "Problems: " + e.getMessage(), 1).show();
        }
    }

    public void playWithRawFiles() throws IOException {      
        String str = "";
        StringBuffer buf = new StringBuffer();            
        InputStream is = this.getResources().openRawResource(R.drawable.my_base_data);
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(is));
            if (is != null) {                            
                while ((str = reader.readLine()) != null) {    
                    buf.append(str + "\n" );
                }                
            }
        } finally {
            try { is.close(); } catch (Throwable ignore) {}
        }
        Toast.makeText(getBaseContext(), buf.toString(), Toast.LENGTH_LONG).show();
    }
}

- Yogesh Tatwal

Answer 2

使用 BufferedReader 读取输入流。由于 BufferedReader 从字符输入流中读取文本，缓冲字符以便提供对字符、数组和行的有效读取，所以效率较高。 InputStream 表示字节输入流。 reader.readLine() 将逐行读取文件。

BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder out = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
    out.append(line);   // add everything to StringBuilder 
    // here you can have your logic of comparison.
    if(line.toString().equals(".")) {
        // do something
    } 

}

- Vinay

Answer 3

File fe = new File("abc.txt");
FileInputStream fis = new FileInputStream(fe);
byte data[] = new byte[fis.available()];
fis.read(data);
fis.close();
String str = new String(data);
System.out.println(str);

- Ziyad

---

为了更好地理解和使用您的代码，提供上下文会非常有帮助。 - Adonis

如果你有一个txt文件想要使用FileInputStream读取其中的文本，你可以这样做......在你的代码中加入以下内容：File fe=new File(abc.txt);，并将读取到的数据打印在控制台上，代码如下：String str=new String(data); System.out.println(str); - Ziyad