轉換成的StringBuffer PDF文件

我在這個項目中，我從一個web服務收到以下形式的工作：轉換成的StringBuffer PDF文件

%PDF-1.5%��3 0 obj<</Length 1294 /Filter /FlateDecode>>streamx�uV�n#G��W�X,E��$d✂��e�A�Z��íe�P��܊E>��ӧ�~.��ql�v��)�~��;t�l6O��O��.......

我無法閱讀的PDF格式。我試圖將這些字節插入一個pdf文件，但它沒有奏效。我也試圖打開使用webview ...沒有成功。

這裏的一些代碼：

URL url = new URL(LINKTOWEBSERVICE); //Enter URL here 
private StringBuffer response; 
JSONObject jsonObject = new JSONObject(); 
jsonObject.put("_id", obj.getLogin()); 
jsonObject.put("senha", md5(obj.getPassword())); 

String mensagem = jsonObject.toString(); 

//connection with server 
HttpURLConnection connection = (HttpURLConnection) url.openConnection(); 
connection.setReadTimeout(10000); 
connection.setConnectTimeout(15000); 
connection.setRequestMethod("POST"); 
connection.setDoInput(true); 
connection.setDoOutput(true); 

connection.setFixedLengthStreamingMode(mensagem.getBytes().length); 
connection.setRequestProperty("Content-Type", "application/json;charset=utf-8"); 
connection.setRequestProperty("X-Requested-With", "XMLHttpRequest"); 

//Opening connection 
connection.connect(); 

//Sending data 
OutputStream outputStream = new BufferedOutputStream(connection.getOutputStream()); 
outputStream.write(mensagem.getBytes()); 
outputStream.flush(); 

//Response 
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream())); 
response = new StringBuffer(); 
String inputLine; 
while ((inputLine = bufferedReader.readLine()) != null) { 
    response.append(inputLine); 
       } 

bufferedReader.close();

。

public File createPDF(byte[] data) { 
     // Get the directory for the user's public pictures directory. 
     String fileName = "exame.pdf"; 
     File pdfFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), fileName); 
     FileOutputStream outputStream; 
     byte[] bytes; 

     try{ 
      if(pdfFile.exists()){ 
        pdfFile.delete(); 
       } 
      pdfFile.createNewFile(); 

      outputStream = new FileOutputStream(pdfFile); 
      outputStream.write(String.valueOf(response).getBytes()); 
      outputStream.close();  
     } 
     catch (Exception e){ 
      Log.e("PDF CREATION", "FILE NOT CREATED"); 
      e.printStackTrace(); 
     }

它創建PDF文件。但它已損壞。

來源

2016-09-23 Rafael Acurcio

你能驗證發送的pdf是否有效嗎？ –

字符串在內部使用Unicode，char是兩個字節的UTF-16。因此，從字節到字符串和反轉字節在某些字符集中被解釋爲文本，併發生轉換。這不僅很慢，而且會使用雙重記憶，但也會導致錯誤。

只需使用字節：

//Response 
ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
BufferedInputStream in = new BufferedInputStream(connection.getInputStream()); 
byte[] buffer = new byte[1024]; 
int n; 
while ((n = in.read(buffer)) > 0) { 
    baos.write(buffer,0, n); 
} 
in.close(); 
byte[] response = baos.toByteArray();

現在你可以寫一個文件。您可以立即寫入FileOutputStream而不是寫入ByteArrayOutputStream。

來源

2016-09-24 00:00:10

轉換成的StringBuffer PDF文件

回答

相關問題