將ByteArray轉換為String時出現OutOfMemory異常？

Question

我使用以下代碼將我的ByteArray轉換為String：

String sReturn = new String(byteArray, "UTF-8");

但是當ByteArray足夠大時，我得到以下異常。

有沒有其他方法將ByteArray轉換為String而沒有內存不足異常？

06-17 12:27:37.594: E/dalvikvm(1617): Out of memory: Heap Size=30663KB, Allocated=22087KB, Bitmap Size=936KB, Limit=32768KB
06-17 12:27:37.594: E/dalvikvm(1617): Extra info: Footprint=30663KB, Allowed Footprint=30663KB, Trimmed=616KB
06-17 12:27:37.594: W/dalvikvm(1617): threadid=9: thread exiting with uncaught exception (group=0x4001d648)
06-17 12:27:37.594: E/AndroidRuntime(1617): FATAL EXCEPTION: Thread-19
06-17 12:27:37.594: E/AndroidRuntime(1617): java.lang.OutOfMemoryError: (Heap Size=30663KB, Allocated=22087KB, Bitmap Size=936KB)
06-17 12:27:37.594: E/AndroidRuntime(1617):     at java.lang.String.<init>(String.java:422)
06-17 12:27:37.594: E/AndroidRuntime(1617):     at java.lang.String.<init>(String.java:276)
06-17 12:27:37.594: E/AndroidRuntime(1617):     at org.mabna.order.utils.Utilities.decompress(Utilities.java:389)
06-17 12:27:37.594: E/AndroidRuntime(1617):     at org.mabna.order.utils.WebserviceResponse.getClearedResponse(WebserviceResponse.java:18)
06-17 12:27:37.594: E/AndroidRuntime(1617):     at org.mabna.order.businessLayer.BoWebService.getDataForUpdate(BoWebService.java:216)
06-17 12:27:37.594: E/AndroidRuntime(1617):     at org.mabna.order.ui.ActToolDataExchange.threadGetDataForFullUpdate(ActToolDataExchange.java:389)
06-17 12:27:37.594: E/AndroidRuntime(1617):     at org.mabna.order.ui.ActToolDataExchange.access$9(ActToolDataExchange.java:380)
06-17 12:27:37.594: E/AndroidRuntime(1617):     at org.mabna.order.ui.ActToolDataExchange$35.run(ActToolDataExchange.java:639)
06-17 12:27:37.594: E/AndroidRuntime(1617):     at org.mabna.order.utils.Utilities$4.run(Utilities.java:924)

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UPDATE

public static String decompress(String zipText) throws IOException {
    byte[] compressed = Base64.decode(zipText);
    if (compressed.length > 4) {
        GZIPInputStream gzipInputStream = new GZIPInputStream(
                new ByteArrayInputStream(compressed, 4,
                        compressed.length - 4));

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        for (int value = 0; value != -1;) {
            value = gzipInputStream.read();
            if (value != -1) {
                baos.write(value);
            }
        }
        gzipInputStream.close();
        baos.close();

        byte[] byteArray = baos.toByteArray();

        Log.i("toByteArray", String.valueOf(byteArray.length));

        String sReturn = new String(byteArray, "UTF-8");

        return sReturn;
    } else {
        return "";
    }
}



public static String decrypt(String encrypted, String password)
        throws Exception {

    byte[] encrypteddata = Base64.decode(encrypted);

    byte[] bytes = decrypt(encrypteddata, password);

    String result = new String(bytes, "UTF-8");

    return result;
}

public static byte[] decrypt(byte[] encrypted, String password)
        throws Exception {

    byte[] passwordKey = encodeDigest(password);
    try {
        aesCipher = Cipher.getInstance(CIPHER_TRANSFORMATION);
    } catch (NoSuchAlgorithmException e) {
        throw new Exception(
                "Decryption Exception: No such algorithm\r\n" + e
                        .toString());
    } catch (NoSuchPaddingException e) {
        throw new Exception(
                "Decryption Exception: No such padding PKCS5\r\n" + e
                        .toString());
    }
    secretKey = new SecretKeySpec(passwordKey, CIPHER_ALGORITHM);

    try {
        aesCipher.init(Cipher.DECRYPT_MODE, secretKey, ivParameterSpec);
    } catch (InvalidKeyException e) {
        throw new Exception(
                "Decryption Exception: Invalid key\r\n" + e.toString());
    } catch (InvalidAlgorithmParameterException e) {
        throw new Exception(
                "Decryption Exception: Invalid algorithm\r\n" + e
                        .toString());
    }

    byte[] encryptedData;
    try {
        encryptedData = aesCipher.doFinal(encrypted);
    } catch (IllegalBlockSizeException e) {
        throw new Exception(
                "Decryption Exception: Illegal block size\r\n" + e
                        .toString());
    } catch (BadPaddingException e) {
        throw new Exception(
                "Decryption Exception: Bad padding\r\n" + e
                        .toString());
    }
    return encryptedData;
}

Answer 1

以下片段將幫助您。嘗試閱讀塊

             StringBuilder sb=new StringBuilder();  

             Log.v("abc","length : " + byteArray.length);  

             while (totalBytesRead < formDataLength) {    
                 byteRead = in.read(dataBytes, totalBytesRead, formDataLength);    
                 // byteRead = in.read(dataBytes);    
                 //totalBytesRead += byteRead;    
                 sb.append((char)byteRead);  
             }    

              String s=sb.toString(); 

Answer 2

我會一次將它分解成1000個字符串。 3663125字節是很多內存，特別是對於android。

ArrayList<String> strings = new ArrayList<String>();
byte[] set = new byte[1000];
for(int x = 0, index = 0; x < byteArray.length;x++, index++)
{
    set[index] = byteArray[x];
    if(index == 999)
    {
        strings.add(new String(set, "Unicode"));
        index = 0;
        if(byteArray.length - x < 1000) // shorten the set when there are less than 1000 bytes left
            set = new byte[byteArray.length - x];
   }
}

strings.add(new String(set, "Unicode"));

String stringArray[] = (String[])strings.toArray();

這將為你分解，如果那個太小，你可以將1000改為你想要的任何東西。

Answer 3

您正在過度分配內存 - 首先解壓縮base 64並為此分配緩沖區，然后解壓縮它並將chusnks寫入BAOS（正在分配和重新分配內存塊）並將其再次復制到字符串 - 難怪它運行記不清。

嘗試將其重寫為流式處理（有srteaming base64 dcoding，以及gzip解碼器）