Android TXT文件读写

[java] view plaincopy

 

package com.wirelessqa.helper;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;

import org.apache.http.util.EncodingUtils;

import android.app.Activity;

public class FileAccess extends Activity {

    /**
     * 一、私有文件夹下的文件存取（/data/data/包名/files）
     *
     * @param fileName
     * @param message
     */
    public void writeFileData(String fileName, String message) {
        try {
            FileOutputStream fout = openFileOutput(fileName, MODE_PRIVATE);
            byte[] bytes = message.getBytes();
            fout.write(bytes);
            fout.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * //读文件在./data/data/包名/files/下面
     *
     * @param fileName
     * @return
     */
    public String readFileData(String fileName) {
        String res = "";
        try {
            FileInputStream fin = openFileInput(fileName);
            int length = fin.available();
            byte[] buffer = new byte[length];
            fin.read(buffer);
            res = EncodingUtils.getString(buffer, "UTF-8");
            fin.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return res;
    }

    /**
     * 写， 读sdcard目录上的文件，要用FileOutputStream， 不能用openFileOutput
     * 不同点：openFileOutput是在raw里编译过的，FileOutputStream是任何文件都可以
     * @param fileName
     * @param message
     */
    // 写在/mnt/sdcard/目录下面的文件
    public void writeFileSdcard(String fileName, String message) {

        try {

            // FileOutputStream fout = openFileOutput(fileName, MODE_PRIVATE);

            FileOutputStream fout = new FileOutputStream(fileName);

            byte[] bytes = message.getBytes();

            fout.write(bytes);

            fout.close();

        }

        catch (Exception e) {

            e.printStackTrace();

        }

    }

    // 读在/mnt/sdcard/目录下面的文件

    public String readFileSdcard(String fileName) {

        String res = "";

        try {

            FileInputStream fin = new FileInputStream(fileName);

            int length = fin.available();

            byte[] buffer = new byte[length];

            fin.read(buffer);

            res = EncodingUtils.getString(buffer, "UTF-8");

            fin.close();

        }

        catch (Exception e) {

            e.printStackTrace();

        }

        return res;

    }


    /**
     * 二、从resource中的raw文件夹中获取文件并读取数据（资源文件只能读不能写）
     *
     * @param fileInRaw
     * @return
     */
    public String readFromRaw(int fileInRaw) {
        String res = "";
        try {
            InputStream in = getResources().openRawResource(fileInRaw);
            int length = in.available();
            byte[] buffer = new byte[length];
            in.read(buffer);
            res = EncodingUtils.getString(buffer, "GBK");
            // res = new String(buffer,"GBK");
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return res;
    }

    /**
     * 三、从asset中获取文件并读取数据（资源文件只能读不能写）
     *
     * @param fileName
     * @return
     */
    public String readFromAsset(String fileName) {
        String res = "";
        try {
            InputStream in = getResources().getAssets().open(fileName);
            int length = in.available();
            byte[] buffer = new byte[length];
            in.read(buffer);
            res = EncodingUtils.getString(buffer, "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return res;
    }



}