java - 在java中将文本文件转换为字符串

Question

我编写了一个代码，通过将文本文件转换为字符串并将其发送到 Web 服务来发送文本文件。请有人告诉我将字符串作为流发送到 Web 服务的其他可用方法。

public class MainActivity extends Activity {
    Button b1;
    String s;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        b1=(Button)findViewById(R.id.button1);
        b1.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                File upfile=new File("sdcard/text/testfile.txt");
                try {
                    FileInputStream fin=new FileInputStream(upfile);
                    byte[] buffer= new byte[(int)upfile.length()];
                    new DataInputStream(fin).readFully(buffer);
                    fin.close();
                    s=new String(buffer,"UTF-8");
                    System.out.print(buffer);
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                // TODO Auto-generated method stub
                Toast.makeText(MainActivity.this, s, 20).show();

            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}

Answer 1

试试这个。

public void mReadJsonData() {
    try {
        File f = new File("sdcard/text/testfile.txt");
        FileInputStream is = new FileInputStream(f);
        int size = is.available();
        byte[] buffer = new byte[size];
        is.read(buffer);
        is.close();
        String text = new String(buffer);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

Answer 2

使用此代码从文件中读取数据并将其转换为字符串并根据您的需要提前进行处理 -

File upfile=new File("sdcard/text/testfile.txt");
 try {
            final BufferedReader reader = new BufferedReader(new FileReader(upfile));
            String encoded = "";
            try {
                String line;
                while ((line = reader.readLine()) != null) {
                    encoded += line;
                }
            }
            finally {
                reader.close();
            }
                 System.out.print(encoded);
        }
        catch (final Exception e) {

        }