使用HttpUrlConnection访问servlet时出现异常

Question

我需要将图像上载到服务器。对于我需要通过2个参数

1.图像（字节阵列）
2. ID（用户的ID）

如何传递参数用于使用HTTP URL连接

POST方法

在这里，我试图通过字节arry（图像）部分。

但是，当我exceute的错误时抛出抛出代码：

我的代码是：

ByteArrayOutputStream out = new ByteArrayOutputStream(); 
bmp.compress(CompressFormat.PNG, 100, out); 
byte[] imageBytes = out.toByteArray(); 
String imagePost = Base64.encodeToString(imageBytes, Base64.DEFAULT); 

String fileName = "temporary_holder.jpg"; 
HttpURLConnection conn = null; 
DataOutputStream dos = null; 
DataInputStream inStream = null; 
String lineEnd = "\r\n"; 
String twoHyphens = "--"; 
String boundary = "*****"; 
int bytesRead, bytesAvailable, bufferSize; 
byte[] buffer; 
int maxBufferSize = 1 * 1024 * 1024; 
String responseFromServer = ""; 
String sourceFileUri = HomeScreen.get_path(); 

String upLoadServerUri = "http://10.120.10.87:8080/ContactsManagerWeb/CustomHttpRequest"; 

File sourceFile = new File(sourceFileUri); 
if (!sourceFile.isFile()) { 
       return; 
} 
int serverResponseCode = 0; 
try { // open a URL connection to the Servlet 
    FileInputStream fileInputStream = new FileInputStream(sourceFile); 
    URL url = new URL(upLoadServerUri); 

    conn = (HttpURLConnection) url.openConnection(); // Open a HTTP 
         // connection to 
          // the URL 
    conn.setDoInput(true); // Allow Inputs 
    conn.setDoOutput(true); // Allow Outputs 
    conn.setUseCaches(false); // Don't use a Cached Copy 
    conn.setRequestMethod("POST"); 
    conn.setRequestProperty("Connection", "Keep-Alive"); 
    conn.setRequestProperty("ENCTYPE", "multipart/form-data"); 
    conn.setRequestProperty("Content-Type", 
     "multipart/form-data;boundary=" + boundary); 

    conn.setRequestProperty("userId", String.valueOf(userId)); 
    //conn.setRequestProperty("image", imagePost); 
    conn.addRequestProperty("userId", String.valueOf(userId)); 

    conn.addRequestProperty("image", imagePost); 

    dos = new DataOutputStream(conn.getOutputStream()); 

    dos.writeBytes(twoHyphens + boundary + lineEnd); 
    dos.writeBytes("Content-Disposition: form-data; name=\"image\";filename=\"" 
     + imagePost + "\"" + lineEnd); 
    dos.writeBytes(lineEnd); 

    bytesAvailable = fileInputStream.available(); // create a buffer of 
          // maximum size 
    System.out.println("Huzza Initial .available : " + bytesAvailable); 

    // bufferSize = Math.min(bytesAvailable, maxBufferSize); 
    bufferSize = (int) sourceFile.length(); 

    System.out.println("BytesAvail" + bytesAvailable); 
    System.out.println("maxBufferSize" + maxBufferSize); 
    buffer = new byte[bufferSize]; 

    // read file and write it into form... 
    bytesRead = fileInputStream.read(buffer, 0, bufferSize); 

    while (bytesRead > 0) { 
    dos.write(buffer, 0, bufferSize); 

    bytesAvailable = fileInputStream.available(); 

    bufferSize = Math.min(bytesAvailable, maxBufferSize); 
    bytesRead = fileInputStream.read(buffer, 0, bufferSize); 
    } 

    // send multipart form data necesssary after file data... 
    dos.writeBytes(lineEnd); 
    dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd); 

    // Responses from the server (code and message) 
    serverResponseCode = conn.getResponseCode(); 
    String serverResponseMessage = conn.getResponseMessage(); 

    System.out.println("Upload file to serverHTTP Response is : " 
     + serverResponseMessage + ": " + serverResponseCode); 
    // close streams 
    System.out.println("Upload file to server" + fileName 
     + " File is written"); 
    fileInputStream.close(); 
    dos.flush(); 
    dos.close(); 
} catch (MalformedURLException ex) { 
    ex.printStackTrace(); 
    Log.e("Upload file to server", "error: " + ex.getMessage(), ex); 
} catch (Exception e) { 
    e.printStackTrace(); 
} 
// this block will give the response of upload link 
try { 
    BufferedReader rd = new BufferedReader(new InputStreamReader(
     conn.getInputStream())); 
    String line; 
    while ((line = rd.readLine()) != null) { 
    System.out.println("" + "Message: " + line); 
    } 
    rd.close(); 
} catch (IOException ioex) { 
    Log.e("faf", "error: " + ioex.getMessage(), ioex); 
} 
return;  
} 

例外：

03-31 10:53:38.298: WARN/System.err(4522): java.net.SocketException: Broken pipe 
03-31 10:53:38.302: WARN/System.err(4522):  at org.apache.harmony.luni.platform.OSNetworkSystem.writeSocketImpl(Native Method) 
03-31 10:53:38.302: WARN/System.err(4522):  at org.apache.harmony.luni.platform.OSNetworkSystem.write(OSNetworkSystem.java:723) 
03-31 10:53:38.302: WARN/System.err(4522):  at org.apache.harmony.luni.net.PlainSocketImpl.write(PlainSocketImpl.java:578) 
03-31 10:53:38.302: WARN/System.err(4522):  at org.apache.harmony.luni.net.SocketOutputStream.write(SocketOutputStream.java:59) 
03-31 10:53:38.302: WARN/System.err(4522):  at java.io.ByteArrayOutputStream.writeTo(ByteArrayOutputStream.java:248) 
03-31 10:53:38.302: WARN/System.err(4522):  at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl$DefaultHttpOutputStream.flushToSocket(HttpURLConnectionImpl.java:680) 
03-31 10:53:38.302: WARN/System.err(4522):  at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.sendRequest(HttpURLConnectionImpl.java:1336) 
03-31 10:53:38.302: WARN/System.err(4522):  at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.doRequestInternal(HttpURLConnectionImpl.java:1656) 
03-31 10:53:38.302: WARN/System.err(4522):  at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.doRequest(HttpURLConnectionImpl.java:1649) 
03-31 10:53:38.302: WARN/System.err(4522):  at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:1374) 
03-31 10:53:38.302: WARN/System.err(4522):  at com.ey.camera.webservice.ContactManagerWebService.webservicePhp(ContactManagerWebService.java:341) 
03-31 10:53:38.302: WARN/System.err(4522):  at com.ey.camera.CameraView$4.onClick(CameraView.java:177) 
03-31 10:53:38.306: WARN/System.err(4522):  at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:158) 
03-31 10:53:38.306: WARN/System.err(4522):  at android.os.Handler.dispatchMessage(Handler.java:99) 
03-31 10:53:38.306: WARN/System.err(4522):  at android.os.Looper.loop(Looper.java:123) 
03-31 10:53:38.306: WARN/System.err(4522):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
03-31 10:53:38.306: WARN/System.err(4522):  at java.lang.reflect.Method.invokeNative(Native Method) 
03-31 10:53:38.306: WARN/System.err(4522):  at java.lang.reflect.Method.invoke(Method.java:521) 
03-31 10:53:38.306: WARN/System.err(4522):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:871) 
03-31 10:53:38.306: WARN/System.err(4522):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629) 
03-31 10:53:38.306: WARN/System.err(4522):  at dalvik.system.NativeStart.main(Native Method) 

的Servlet：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
     System.out.println("doPost"); 
     String userId = request.getParameter("userId"); 
     String image = request.getParameter("image"); 
     System.out.println("value1: " +userId); 
     System.out.println(" Image : "+image); 

Answer 1

我会将输出流封装在BufferedOutputStream中，作为开始。