Hi,
I have a problem uploading a file using HttpClient from Apache.
Here is the scenario:
I have a simple Java Servlet rendering a form having three fields:
1. Text Box
2. Text Box
3. File
This form has POST method.
I want to write a piece of Java code to submit the POST request.
I tried using the HttpClient and PostMethod. That doesn't seem to
work in my case.
Here is the servlet code:
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<body>");
out.println("<head>");
String title = rb.getString("requestparams.title");
out.println("<title>" + title + "</title>");
out.println("</head>");
out.println("<body bgcolor=\"white\">");
// img stuff not req'd for source code html showing
// all links relative
// XXX
// making these absolute till we work out the
// addition of a PathInfo issue
out.println("<a href=\"../reqparams.html\">");
out.println("<img src=\"../images/code.gif\" height=24 " +
"width=24 align=right border=0 alt=\"view code\"></a>");
out.println("<a href=\"../index.html\">");
out.println("<img src=\"../images/return.gif\" height=24 " +
"width=24 align=right border=0 alt=\"return\"></a>");
out.println("<h3>" + title + "</h3>");
String firstName = request.getParameter("firstname");
String lastName = request.getParameter("lastname");
Object file = (Object)request.getParameter("upfile");
out.println(rb.getString("requestparams.params-in-req") + "<br>");
if (firstName != null || lastName != null) {
out.println(rb.getString("requestparams.firstname"));
out.println(" = " + HTMLFilter.filter(firstName) + "<br>");
out.println(rb.getString("requestparams.lastname"));
out.println(" = " + HTMLFilter.filter(lastName));
out.println("File: ");
out.println(" = " + HTMLFilter.filter(file.toString()));
} else {
out.println(rb.getString("requestparams.no-params"));
}
out.println("<P>");
out.print("<form action=\"");
out.print("RequestParamExample\" ");
out.println("method=POST>");
out.println(rb.getString("requestparams.firstname"));
out.println("<input type=text size=20 name=firstname>");
out.println("<br>");
out.println(rb.getString("requestparams.lastname"));
out.println("<input type=text size=20 name=lastname>");
out.println("<br>");
out.println("File: ");
out.println("<input type=file name=upfile>");
out.println("<input type=submit>");
out.println("</form>");
out.println("</body>");
out.println("</html>");
Here is the java code I wrote using HttpClient and PostMethod
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.MultipartPostMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.multipart.FilePart;
import org.apache.commons.httpclient.methods.multipart.FilePartSource;
import org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity;
import org.apache.commons.httpclient.methods.multipart.Part;
import org.apache.commons.httpclient.methods.multipart.StringPart;
import org.apache.commons.httpclient.params.HttpMethodParams;
public class ParamTest {
public static void main(String[] args) {
HttpClient client = new HttpClient();
BufferedReader br = null;
PostMethod postMethod = new PostMethod("http://localhost:8080/servlets-examples/servlet/RequestParamExample");
postMethod.getParams().setBooleanParameter(HttpMethodParams.USE_EXPECT_CONTINUE,true);
File f = new File("HostProfile3112009_1354502.log");
try {
Part[] parts = {
new StringPart("firstname", "Praveen"),
new StringPart("lastname", "Yarlagadda"),
new FilePart(f.getName(), f)
};
postMethod.setRequestEntity(
new MultipartRequestEntity(parts, postMethod.getParams())
);
}
catch(FileNotFoundException ex) {
ex.printStackTrace();
}
client.getHttpConnectionManager().getParams().setConnectionTimeout(5000);
try{
int returnCode = client.executeMethod(postMethod);
if(returnCode == HttpStatus.SC_NOT_IMPLEMENTED) {
System.err.println("The Post method is not implemented by this URI");
postMethod.getResponseBodyAsString();
} else {
br = new BufferedReader(new InputStreamReader(postMethod.getResponseBodyAsStream()));
String readLine;
while(((readLine = br.readLine()) != null)) {
System.err.println(readLine);
}
}
} catch (Exception e) {
System.err.println(e);
} finally {
postMethod.releaseConnection();
if(br != null) try { br.close(); } catch (Exception fe) {}
}
}
}
It is supposed to create a POST request and send it to the Server. But,
I don't think the server is receiving the POST request containing all the data.
As a result, I receive only Servlet content, not the content it generates after
receiving the POST request. If anybody knows what is wrong with this,
please help. If I am using the wrong APIs, please let me know.
Thank you,
Praveen