I am currently using TrueZip to add a file to a Zip file that was uploaded to a server via MultiPartFile.
The Problem
Upon appending a file the zip becomes invalid. It can no longer be opened as a zip file.
The Code
Let's start with the relevant code in my upload controller (file is the MultiPartFile):
// Get the file
File dest = null;
TFile zip = null;
try {
// Obtain the file locally, zip, and delete the old
dest = new File(request.getRealPath("") + "/datasource/uploads/" + fixedFileName);
file.transferTo(dest);
// Validate
zip = new TFile(dest);
resp = mls.validateMapLayer(zip);
// Now perform the upload and delete the temp file
FoundryUserDetails userDetails = (FoundryUserDetails) SecurityContextHolder.getContext().getAuthentication()
.getPrincipal();
UserIdentity ui = userDetails.getUserIdentity();
MapLayer newLayer = new MapLayer();
// generate the prj
mls.generateProjection(resp, dest.getAbsolutePath(), projection);
The method "generateProjection" is where the file is added:
public void generateProjection(UploadMapResponse resp, String fLoc, FoundryCRS proj) throws NoSuchAuthorityCodeException,
FactoryException, IOException {
TFile projFile = new TFile(fLoc, resp.getLayerName() + ".prj");
CoordinateReferenceSystem crs = CRS.decode(proj.getEpsg());
String wkt = crs.toWKT();
TConfig config = TConfig.push();
try {
config.setOutputPreferences(config.getOutputPreferences().set(FsOutputOption.GROW));
TFileOutputStream writer = new TFileOutputStream(projFile);
try {
writer.write(wkt.getBytes());
} finally {
writer.close();
}
} finally {
config.close();
}
}
In order to test if this worked at all I tried it in a simple main:
public static void main(String[] args) {
File f = new File("C:/Data/SierritaDec2011TopoContours.zip");
TFile tf = new TFile(f);
tf.listFiles();
TFile proj = new TFile(f, "test.prj");
TConfig config = TConfig.push();
try {
config.setOutputPreferences(config.getOutputPreferences().set(FsOutputOption.GROW));
TFileOutputStream writer = null;
try {
writer = new TFileOutputStream(proj);
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
try {
writer.write("Hello Zip world".getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
writer.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} finally {
// Pop the current configuration off the inheritable thread local
// stack.
config.close();
}
}
Which, of course, works just fine.
The Question
Does anyone have insight into why, in a web server with a MultiPartFile copied to a local file, the TFileOutputStream fails to write properly?