在我的项目中，我正在尝试将文件发送到Amazon S3。代码现在可以运行，但有时发生错误，我无法在S3上看到该文件。以下日志：
java.io.IOException: Error writing to server
at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:625)
at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:637)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1321)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
at com.datagravity.gdphonehome.sample.SendingBigDataLocal.sendRequest(SendingBigDataLocal.java:219)
at com.datagravity.gdphonehome.sample.SendingBigDataLocal.doGet(SendingBigDataLocal.java:121)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
我不明白为什么会这样。请看下面，如果可以，请帮助我。我的代码如下：
public void sendRequest(String request) throws JSONException {
msg = new StringBuffer();
String message = null;
// Add text message parameter
appendBoudary("text-message", "Text Message");
message = msg.toString();
DataFileReader fileUpload;
mapUploadFiles = new Hashtable<String, Vector<String>>();
fileUpload = new DataFileReader("/home/varick/DataGravity_Proxy_Application/DGPhoneHome(vuong.tran).war");
try {
//Add file to upload
org.codehaus.jettison.json.JSONObject jsonHeader = new JSONObject();
jsonHeader = writeJSONHeader();
Vector file_name = new Vector();
file_name.add(fileUpload.getBytes());
file_name.add(appendBoudaryFileHeader(jsonHeader, "phonehome32M-Varick(Test)"));
mapUploadFiles.put(jsonHeader.toString(), file_name);
} catch (Exception ex1) {
ex1.printStackTrace();
}
try {
URL url = new URL(request);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.setDoOutput(true);
//connection.setRequestProperty("sessionId", "<sessionId_of_sfdc_username>"); // put sessionId into header
connection.setRequestProperty("sessionId", json.getString("SessionId")); // sessionId of username: chau.dinh@enclave.vn
connection.setRequestProperty("SessionIdSFDC", json.getString("SessionIdSFDC"));
if (mapUploadFiles.size() > 0) {
connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + Constants.BOUNDARY_VALUE);
connection.setRequestProperty("Connection", "Close");
}
connection.setRequestMethod("POST");
out = connection.getOutputStream();
// Send message first
if (message != null) {
// Send text parameters
out.write(message.toString().getBytes());
// Send files
if (null != mapUploadFiles) {
Enumeration<String> e = mapUploadFiles.keys();
while (e.hasMoreElements()) {
String keyFile = (String) e.nextElement();
if (!keyFile.equals(FLAG_MUTI_SUPPORT)) {
Vector ItemFiles = (Vector) mapUploadFiles.get(keyFile);
//System.out.println("Vector Size: " + ItemFiles.size());
String fileHeader = (String) ItemFiles.elementAt(1);
System.out.println(fileHeader);
// Write header file
out.write(fileHeader.getBytes());
out.write("\r\n".getBytes());
// Write data file uploading
byte[] data = (byte[]) ItemFiles.elementAt(0);
out.write(data);
}
out.write("\r\n".getBytes());
}
}
// Send the end signal
String endBoundary = "\r\n--" + Constants.BOUNDARY_VALUE + "--\r\n";
out.write(endBoundary.getBytes());
int respCode = connection.getResponseCode();
if (respCode == HttpURLConnection.HTTP_OK) {
// reads server's response
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String response = reader.readLine();
System.out.println(response);
} else {
System.out.println("Server returned non-OK code: " + respCode);
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
第int respCode = connection.getResponseCode();行