Uploading a file from a J2ME application
Ok, obviously this is either not interesting, or no one really knows what to do, I would love any ideas even if they dont work, just anything that would help would be great :)
I am extremely new to servlet programming and reasonably new to J2ME. I want to upload a file from my device to a central server. I am not sure how to go about starting this. I have a html form that requests a file and posts it to the servlet fine, but I am not sure how I would get my J2ME application to do the same. Do I replicate the html from with in the program? Any help would be much appreciated.
My basic servlet and Java code is:
Java
public String sendPostRequest(String urlstring)throws IOException{
HttpConnection hc =null;
DataInputStream dis =null;
DataOutputStream dos =null;
String message ="";
// the request body
FileSystem fs =new FileSystem();
byte[] file = fs.returnFile("c:/other/dot/helloworld.txt");
if(file !=null){
String fileString = ("file=" +new String(file));
try{
// an HttpConnection with both read and write access
hc = (HttpConnection)Connector.open(urlstring, Connector.READ_WRITE);
// set the request method to POST
hc.setRequestMethod(HttpConnection.POST);
// set request type
// Could possibly need to be "application/x-www-form-urlencoded"?
hc.setRequestProperty("Content-Type","multipart/form-data");
hc.setRequestProperty("Content-Length", fileString.length()+"" );
// obtain DataOutputStream for sending the request string
dos = hc.openDataOutputStream();
byte[] requestBody = fileString.getBytes();
// send request string to Web server
for (int i = 0; i < requestBody.length; i++){
dos.writeByte(requestBody[i]);
}
// flush it out
dos.flush();
// obtain DataInputStream for receiving server responses
dis =new DataInputStream(hc.openInputStream());
// retrieve the responses from Web server
int ch;
while ((ch = dis.read()) != -1){
message = message + (char) ch;
}
}finally{
// free up i/o streams and http connection
if (hc !=null)hc.close();
if (dis !=null)dis.close();
if (dos !=null)dos.close();
}
}
Servlet
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.oreilly.servlet.MultipartRequest;
publicclass DNTUploadextends HttpServlet{
publicvoid doPost(HttpServletRequest req, HttpServletResponse res)throws ServletException, IOException{
res.setContentType("text/html");
PrintWriter out = res.getWriter();
try{
MultipartRequest multi =new MultipartRequest(req,"C:\\Servlets+JSP\\DNT", 5*1024*1024);
Enumeration files = multi.getFileNames();
String name = (String)files.nextElement();
File f = multi.getFile(name);
if(f !=null){
out.println("<HTML>");
out.println("<HEAD><TITLE>FileUploader</TITLE></HEAD>");
out.println("<BODY>");
out.println("<H1>Should have saved file</H1>");
out.println("</BODY>");
out.println("</HTML>");
}
else{
res.setHeader("valserror","ERROR");
}
}catch(Exception e){
out.println("<HTML>");
out.println("<BODY>");
out.println("failure!!");
out.println("</BODY>");
out.println("</HTML>");
}
}
}
Message was edited by:
-fluffy-
