0
美好的一天。無法在android中保存文件
我需要將PKCS10 CSR保存在外部存儲卡中。
然而,下面的代碼顯示一個錯誤
java.io.FileNotFoundException:/storage/sdcard0pkcs10.req:打開失敗:EROFS(只讀文件系統)
雖然AndoidManifest.xml正確包括
我覺得這個問題是目錄路徑,因爲它顯示爲0,而不是/
package exam.blowfishcipher;
import java.io.FileWriter;
import java.io.OutputStreamWriter;
import java.security.*;
import org.spongycastle.jce.provider.BouncyCastleProvider;
import java.security.SecureRandom;
import javax.security.auth.x500.X500Principal;
import org.spongycastle.jce.PKCS10CertificationRequest;
import org.spongycastle.openssl.PEMWriter;
import android.os.Environment;
import android.util.*;
import android.widget.*;
public class PKCS10Generater
{
static {
Security.addProvider(new org.spongycastle.jce.provider.BouncyCastleProvider());
}
public static PKCS10CertificationRequest generateRequest(
KeyPair pair)
throws Exception
{
return new PKCS10CertificationRequest(
"SHA256withRSA",
new X500Principal("CN=Test CA Certificate"),
//new X500Principal("CN=end"),
pair.getPublic(),
null,
pair.getPrivate());
}
public static void pemEncodeToFile(String filename, Object obj, char[] password) throws Exception{
PEMWriter pw = new PEMWriter(new FileWriter(filename));
Log.e("Position", "PEMWriter");
if (password != null && password.length > 0) {
pw.writeObject(obj, "DESEDE", password, new SecureRandom());
} else {
pw.writeObject(obj);
}
pw.flush();
pw.close();
}
public static void reqGen() throws Exception
{
//create the keys
Log.e("Position", "reqGen");
KeyPair pair = Utils.generateRSAKeyPair();
//modified 20130203
PKCS10req pkcs10req = new PKCS10req();
PKCS10CertificationRequest request = pkcs10req.generateRequest(pair);
pemEncodeToFile(Environment.getExternalStorageDirectory()+"pkcs10.req", request, null);
Log.e("Position", "getExternalStorage");
PEMWriter pemWrt = new PEMWriter(new OutputStreamWriter(System.out));
pemWrt.writeObject(request);
pemWrt.close();
}
}
你有正確的WRITE_EXTERNAL_STORAGE許可?否則,該設備實際上可能不允許您寫入外部存儲器... – hwrdprkns
如果您在清單中擁有正確的權限,是否可以使用'adb shell'來檢查是否可以在該文件夾中實際寫入 – Matthieu
看起來你不喜歡沒有作者權限,請嘗試使用代碼寫入其他文件。 – ObAt