使用输入流读取文本文件

android java inputstream

2022-09-01 20:19:40

我如何阅读像在Android应用程序中一样的文本文件：

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

所以我可以返回一个字符串，如：

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

我想到的是（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" ...
}

答案 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();
    }
}

答案 2

用于读取输入流。从字符输入流中读取文本，缓冲字符以提供字符、数组和行的高效读取。表示字节的输入流。将逐行读取文件。BufferedReaderBufferedReaderInputStreamreader.readLine()

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
    } 

}