如何通过multipart/form-data从j2me上传图片到服务器？
问题描述：
虽然我正在上传移动和应用程序编号的多部分来自移动数据，它是击中服务器和数据存储在数据库中。现在我添加捕获的图像，并发送到服务器它显示一个例外。如何通过multipart/form-data从j2me上传图片到服务器？
org.apache.commons.fileupload.FileUploadBase$UnknownSizeException: the request was rejected because its size is unknown
at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:305)
at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest (ServletFileUpload.java:116)
at org.apache.jsp.photo_jsp._jspService(photo_jsp.java:103)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:384)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process (Http11Protocol.java:634)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
at java.lang.Thread.run(Unknown Source)
这里我发送手机和应用程序的号码和捕获的图像以字节(imagecapturephoto1)。捕获的图像在拍照后存储在视图中。但是当我们上传时显示异常。
try
{
System.out.println("url:" + serverUrl);
connection = (HttpConnection)Connector.open(serverUrl,Connector.READ_WRITE);
connection.setRequestMethod(HttpConnection.POST);
connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=*****");
connection.setRequestProperty("User-Agent", "Profile/MIDP-2.1 Configuration/CLDC-1.1");
connection.setRequestProperty("Accept", "application/octet-stream");
writer = new DataOutputStream(connection.openDataOutputStream());
// writer =new DataOutputStream(conn.openOutputStream());
String name="applicationNumber", name1="mobileNumber",name3="photo",
mimeType="text/plain",mimeType2="image/jpeg";
String value="123456789", value1="9849765432",fileName="applicationphoto.jpeg";
// write boundary
writeString(PREFIX);
writeString(boundary);
writeString(NEWLINE);
// write content header
writeString("Content-Disposition: form-data; name=\"" + name + "\"");
writeString(NEWLINE);
if (mimeType != null)
{
writeString("Content-Type: " + mimeType);
writeString(NEWLINE);
}
writeString("Content-Length: " + applicationNumber.length());
writeString(NEWLINE);
writeString(NEWLINE);
// write content
writeString(applicationNumber);
writeString(NEWLINE);
// write boundary
writeString(PREFIX);
writeString(boundary);
writeString(NEWLINE);
// write content header
writeString("Content-Disposition: form-data; name=\"" + name1 + "\"");
writeString(NEWLINE);
if (mimeType != null)
{
writeString("Content-Type: " + mimeType);
writeString(NEWLINE);
}
writeString("Content-Length: " + mobileNumber.length());
writeString(NEWLINE);
writeString(NEWLINE);
// write content
writeString(mobileNumber);
writeString(NEWLINE);
//uploading image...........
// write boundary
writeString(PREFIX);
writeString(boundary);
writeString(NEWLINE);
// write content header
writeString("Content-Disposition: form-data; name=\"" + name3
+ "\"; filename=\"" + fileName + "\"");
writeString(NEWLINE);
if (mimeType2 != null)
{
writeString("Content-Type: " + mimeType2);
writeString(NEWLINE);
}
writeString("Content-Length: " + imagecapturephoto1.length);
writeString(NEWLINE);
writeString(NEWLINE);
// write content
// SEND THE IMAGE
int index = 0;
int size = 1024;
do
{
System.out.println("write:" + index);
if((index+size)<=imagecapturephoto1.length)
{
writer.write(imagecapturephoto1, index, size);
}
index+=size;
}while(index<imagecapturephoto1.length);
writeString(NEWLINE);
writeString(PREFIX);
writeString(boundary);
writeString(PREFIX);
writeString(NEWLINE);
writer.flush();
//writer.write("-- ***** -- \r\n".getBytes());
serverResponseMessage = connection.getResponseMessage();
InputStream inputstream = connection.openInputStream();
// retrieve the response from server
int chnumber;
StringBuffer sbuffer =new StringBuffer();
while((chnumber= inputstream.read()) != -1)
{
sbuffer.append((char)chnumber);
}
String resonsestring=sbuffer.toString();
int end=resonsestring.length();
int tempstr=resonsestring.indexOf(">");
statusResponse=resonsestring.substring(tempstr+1, end);
statusResponse="SUCCESS";
//outputStream.close();
writer.close();
connection.close();
return serverResponseMessage;
}
catch (Exception ex)
{
//statusResponse="SUCCESS";
ex.printStackTrace();
return null;
}
请给我建议，我们怎么也得从去年10 days.please被击中从mobile.I上传图像建议我该如何解决这个问题。
在此先感谢。 -Teja。
答
请尝试下面的代码段，请忽略lat-lon编码。
private void postImageToServer(String curURL) throws Exception
{
// Open up a http connection with the Web server for both send and receive operations
midlet.get_frmLog().append("HttpConnection Enter");
httpConnection = (HttpConnection)Connector.open(URL, Connector.READ_WRITE);
// Set the request method to POST
httpConnection.setRequestMethod(HttpConnection.POST);
// Set the request headers
httpConnection.setRequestProperty(ConstantCodes.ACTION_MODE_PARAMETER,action);
httpConnection.setRequestProperty(ConstantCodes.USER_NAME_REQUEST_PARAMETER,userName);
//httpConnection.setRequestProperty("lat","22.955804");
//httpConnection.setRequestProperty("lon","72.685876");
//httpConnection.setRequestProperty("lat",LatLonFetcherThread.getLatitude());
//httpConnection.setRequestProperty("lon",LatLonFetcherThread.getLongitude());
/*lat = "23.0172";
lon = "72.3416";*/
if (midlet.get_choiceGroupGPS().getSelectedIndex() == 0)
{
lat = LatLonFetcherThread.getLatitude();
lon = LatLonFetcherThread.getLongitude();
}
else if (midlet.get_choiceGroupGPS().getSelectedIndex() != 0) // Added By KALPEN
{
if (midlet.state == mREPORTER.STATE_READING)
{
double xLat,xLon;
try
{
GpsBt.instance().start();
//while (true)
{
gpsBt = GpsBt.instance();
if (gpsBt.isConnected())
{
location = gpsBt.getLocation();
//lat = location.utc;
//lon = location.utc;
lat = (location.latitude + location.northHemi);
lon = (location.longitude + location.eastHemi);
lat = lat.substring(0,lat.length()-1);
lon = lon.substring(0,lon.length()-1);
xLat = Double.parseDouble(lat)/(double)100.00;
xLon = Double.parseDouble(lon)/(double)100.00;
lat = xLat + "";
lon = xLon + "";
lat = lat.substring(0,7);
lon = lon.substring(0,7);
//lat = "23.0172";
//lon = "72.3416";
}
Thread.sleep(100);
}
}
catch (Exception e) { lat = "23.0172"; lon = "72.3416"; }
}
}
httpConnection.setRequestProperty("lat",lat); // Modifed by KALPEN
httpConnection.setRequestProperty("lon",lon); // Modifed by KALPEN
//String latlongStr = "Latitude: " + LatLonFetcherThread.getLatitude()
// + "\nLongitude: " + LatLonFetcherThread.getLongitude();
/*String latlongStr = "lat: 22.955804" + "lon: 72.685876";*/
//#style screenAlert
/*Alert latlonAlert = new Alert("LatLon alert");
latlonAlert.setString(latlongStr);
mREPORTER.display.setCurrent(latlonAlert);*/
if(eventName == null || eventName.equals(""))
eventName = "default";
// all the headers are sending now and connection channel is establising
httpConnection.setRequestProperty(ConstantCodes.EVENT_NAME_REQUEST_PARAMETER, eventName);
httpConnection.setRequestProperty(ConstantCodes.CAMERAID_REQUEST_PARAMETER, cameraID);
httpConnection.setRequestProperty(ConstantCodes.COMPRESSION_MODE_REQUEST_PARAMETER, compressionMode);
midlet.get_frmLog().append("Write on server-->"+imageBytes.length);
DataOutputStream dos = httpConnection.openDataOutputStream();
dos.write(imageBytes);
midlet.threadFlag=true;
}
以上方法对我的代码正常工作，因为我也试图上传图像到服务器。
在上面的代码中writeString（s）;我使用了相同的代码public void writeString（String s）throws java.io.IOException { byte [] b = s.getBytes（）; Writer.write（b，0，b.length）; writer.write（b，0，b.length）; }当我发送图像数据的多部分form-data.So我用上面的代码发送image.It是显示未知的大小异常。 – Teja
亲爱的泰雅，上传图片时还需要指定图片的大小。 – Lucifer
嗨Kalpen， 在上面的代码中我提到大小为writeString（“Content-Length：”+ imagecapturephoto1.length）;. imagecapturephoto1是以字节为单位拍摄的图像。 – Teja