Is there any convenient way to read and parse data from incoming request.
E.g client initiate post request
URLConnection connection = new URL(url).openConnection();
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
PrintWriter writer = null;
try {
OutputStream output = connection.getOutputStream();
writer = new PrintWriter(new OutputStreamWriter(output, charset), true); // true = autoFlush, important!
// Send normal param.
writer.println("--" + boundary);
writer.println("Content-Disposition: form-data; name=\"param\"");
writer.println("Content-Type: text/plain; charset=" + charset);
writer.println();
writer.println(param);
I’m not able to get param using request.getParameter("paramName")
. The following code
BufferedReader reader = new BufferedReader(new InputStreamReader(
request.getInputStream()));
StringBuilder sb = new StringBuilder();
for (String line; (line = reader.readLine()) != null;) {
System.out.println(line);
}
however displays the content for me
-----------------------------29772313742745
Content-Disposition: form-data; name="name"
J.Doe
-----------------------------29772313742745
Content-Disposition: form-data; name="email"
[email protected]
-----------------------------29772313742745
What is the best way to parse incoming request? I don’t want to write my own parser, probably there is a ready solution.
This question is related to
java
servlets
urlconnection
Solutions:
Solution A:
com.oreilly.servlet.MultipartRequest
Solution B:
org.apache.commons.fileupload.MultipartStream
Solution C:
Solution D:
Use Struts. Struts 1.1 handles this automatically.
Not always there's a servlet before of an upload (I could use a filter for example). Or could be that the same controller ( again a filter or also a servelt ) can serve many actions, so I think that rely on that servlet configuration to use the getPart method (only for Servlet API >= 3.0), I don't know, I don't like.
In general, I prefer independent solutions, able to live alone, and in this case http://commons.apache.org/proper/commons-fileupload/ is one of that.
List<FileItem> multiparts = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request);
for (FileItem item : multiparts) {
if (!item.isFormField()) {
//your operations on file
} else {
String name = item.getFieldName();
String value = item.getString();
//you operations on paramters
}
}
Source: Stackoverflow.com