圖像的servlet上傳.....哪些錯誤與此代碼

Question

下面是Android代碼

public class upload extends Activity { 
    InputStream is; 

    @Override 
    public void onCreate(Bundle icicle) { 
     super.onCreate(icicle); 
     setContentView(R.layout.main); 
     //Bitmap bitmapOrg = BitmapFact0ory.decodeResource(getResources(), 
     //R.drawable.a1); 
     Bitmap bitmapOrg = BitmapFactory.decodeFile("/sdcard/pradeep.jpg"); 
     ByteArrayOutputStream bao = new ByteArrayOutputStream(); 
     bitmapOrg.compress(Bitmap.CompressFormat.JPEG, 90, bao); 
     byte [] ba = bao.toByteArray(); 
     String ba1=Base64.encodeBytes(ba); 
     ArrayList<NameValuePair> nameValuePairs = new 
     ArrayList<NameValuePair>(); 
     nameValuePairs.add(new BasicNameValuePair("image",ba1)); 
     try{ 
      HttpClient httpclient = new DefaultHttpClient(); 
      HttpPost httppost = new 
      HttpPost("http://10.0.2.2:8080/upload/uploadedimg"); 
      httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
      HttpResponse response = httpclient.execute(httppost); 
      HttpEntity entity = response.getEntity(); 
      is = entity.getContent(); 
     }catch(Exception e){ 
      Log.e("log_tag", "Error in http connection "+e.toString()); 
     } 
    } 
} 

我的繼承人servlet代碼....

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
    // TODO Auto-generated method stub 
} 

/** 
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 
*/ 
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
    // TODO Auto-generated method stub 
    InputStream in = request.getInputStream(); 
    BufferedReader r = new BufferedReader(new InputStreamReader(in)); 
    StringBuffer buf = new StringBuffer(); 
    String line; 

    //Read the BufferedReader out and receives String data 
    while ((line = r.readLine())!=null) { 
     buf.append(line); 
    } 
    String imageString = buf.toString(); 

    byte[] imageByteArray = Base64.decode(imageString); 
    FileOutputStream f = new FileOutputStream("C:/test.jpg"); 
    f.write(imageByteArray); 
    f.close(); 
} 

這兩種代碼不能生成一個錯誤，但是當我運行它們時，我沒有看到服務器上的圖像。任何人都可以幫助我嗎？

Answer 1

在將圖像分配給字符串之前，您正在創建名稱值對：您需要在將圖像分配給字符串後創建名稱值對。這就是服務器找不到文件的原因。

變化：

String ba1; 
    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); 
    nameValuePairs.add(new BasicNameValuePair("image",ba1)); 
    try 
    { 
     ba1=Base64.encodeBytes(ba); 

到

ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); 
try 
{ 
    nameValuePairs.add(new BasicNameValuePair("image",Base64.encodeBytes(ba)));