android--读取sd卡中text文件

比眉伴天荒 2022-08-21 09:56 268阅读 0赞

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;   
    \}   
   
   
   
\}