问题
That's it. I have a text file, and I need to move it to a (existing) Zip File in a given directory.
File file = new File("C:\\afolder\\test.txt");
File dir = new File(directoryToGo+"existingzipfile.zip");
boolean success = file.renameTo(new File(dir, file.getName()));
But it does not work. Is there a way to move a file into a existing Zip File? Thank you.
回答1:
Hmm you could use something like:
public static void addFilesToExistingZip(File zipFile, File[] files) throws IOException {
// get a temp file
File tempFile = File.createTempFile(zipFile.getName(), null);
// delete it, otherwise you cannot rename your existing zip to it.
tempFile.delete();
boolean renameOk = zipFile.renameTo(tempFile);
if (!renameOk) {
throw new RuntimeException(
"could not rename the file " + zipFile.getAbsolutePath() + " to " + tempFile.getAbsolutePath());
}
byte[] buf = new byte[1024];
ZipInputStream zin = new ZipInputStream(new FileInputStream(tempFile));
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFile));
ZipEntry entry = zin.getNextEntry();
while (entry != null) {
String name = entry.getName();
boolean notInFiles = true;
for (File f : files) {
if (f.getName().equals(name)) {
notInFiles = false;
break;
}
}
if (notInFiles) { // Add ZIP entry to output stream.
out.putNextEntry(new ZipEntry(name)); // Transfer bytes from the ZIP file to the output file
int len;
while ((len = zin.read(buf)) > 0) {
out.write(buf, 0, len);
}
}
entry = zin.getNextEntry();
} // Close the streams
zin.close(); // Compress the files
for (int i = 0; i < files.length; i++) {
InputStream in = new FileInputStream(files[i]); // Add ZIP entry to output stream.
out.putNextEntry(new ZipEntry(files[i].getName())); // Transfer bytes from the file to the ZIP file
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
} // Complete the entry
out.closeEntry();
in.close();
} // Complete the ZIP file
out.close();
tempFile.delete();
}
Reference:
- http://www.dzone.com/snippets/adding-files-existing-jar-file
回答2:
You'll need to build a new zip file:
- Open the existing zip file for reading
- Open a new zip file for writing
- Copy all the entries from the old zip file to the new one, ignoring an entry corresponding to your extra file, if there is one
- Add your extra file
- Close both the input and the output files
- Delete the old zip file
- Rename the new zip file to the old one's name
回答3:
You can do like this, here uploadPath+fileName is filename with its path:
String FileName="Urzip file name. zip";
FileOutputStream outputStream = new FileOutputStream(uploadPath+fileName);
ZipOutputStream zipFile = new ZipOutputStream(outputStream);
byte[] buffer = new byte[1024];
// Then, here I have list of pdf files in a LIST:
// continuation ...
for (int i = 0; i < filename.size(); i++) {
String file = filename.get(i);
FileInputStream input = new FileInputStream(uploadPath+file);
ZipEntry entry = new ZipEntry(file);
zipFile.putNextEntry(entry);
int len;
while ((len = input.read(buffer)) > 0) {
zipFile.write(buffer, 0, len);
}
zipFile.closeEntry();
input.close();
}
// Next, here "downFile" is the other file which you have to add in your existing zip:
// continuation ...
FileInputStream input = new FileInputStream(uploadPath+downFile);
ZipEntry e = new ZipEntry(downFile);
zipFile.putNextEntry(e);
int len;
while ((len = input.read(buffer)) > 0) {
zipFile.write(buffer, 0, len);
}
zipFile.closeEntry();
input.close();
zipFile.close();
回答4:
Starting with Java 7 you have a zip filesystem provider which allows you to write this code:
final Path src = Paths.get("c:\\afolder\\test.txt");
final String filename = src.getFileName().toString();
final Path zip = Paths.get(directoryToGo, "existingzipfile.zip");
final URI uri = URI.create("jar:" + zip.toUri());
final Map<String, ?> env = Collections.emptyMap();
try (
final FileSystem zipfs = FileSystems.newFileSystem(uri, env);
) {
Files.move(src, zipfs.getPath("/" + filename),
StandardCopyOption.REPLACE_EXISTING);
}
回答5:
Adding the class to move the file to inside jar/zip folder based on accepted answer. The accepted answer didn't hold full executable code ,So i have added the class which helps to move/copy the file to jar/zip package ZipReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
public class ZipWrite {
public static void main(String args[]) throws IOException
{
File file=new File("F:/MyProjects/New folder/mysql-connector-java-5.1.18-bin.jar");
File filetoPush=new File("F:/MyProjects/New folder/BestResponseTimeBalanceStrategy.class");
File[] files=new File[1];
files[0]=filetoPush;
addFilesToExistingZip(file,files);
}
public static void addFilesToExistingZip(File zipFile, File[] files)
throws IOException {
// get a temp file
File tempFile = File.createTempFile(zipFile.getName(), null);
// delete it, otherwise you cannot rename your existing zip to it.
tempFile.delete();
boolean renameOk = zipFile.renameTo(tempFile);
if (!renameOk) {
throw new RuntimeException("could not rename the file "
+ zipFile.getAbsolutePath() + " to "
+ tempFile.getAbsolutePath());
}
byte[] buf = new byte[1024];
ZipInputStream zin = new ZipInputStream(new FileInputStream(tempFile));
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFile));
ZipEntry entry = zin.getNextEntry();
while (entry != null) {
String name = entry.getName();
boolean notInFiles = true;
for (File f : files) {
if (f.getName().equals(name)) {
System.out.println(name);
notInFiles = false;
break;
}
}
if (notInFiles) {
System.out.println("adding");
// Add ZIP entry to output stream.
out.putNextEntry(new ZipEntry(name)); // Transfer bytes from the
// ZIP file to the
// output file
int len;
while ((len = zin.read(buf)) > 0) {
out.write(buf, 0, len);
}
}
entry = zin.getNextEntry();
} // Close the streams
zin.close(); // Compress the files
for (int i = 0; i < files.length; i++) {
FileInputStream in = new FileInputStream(files[i]);
// Add ZIP entry to output stream.
System.out.println("files[i].getName()-->"+files[i].getName());
out.putNextEntry(new ZipEntry("com/mysql/jdbc/util/"+files[i].getName()));
// Transfer bytes from the file to the ZIP file
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
// Complete the entry
out.closeEntry();
in.close();
}
// Complete the ZIP file
out.close();
tempFile.delete();
}
}
来源：https://stackoverflow.com/questions/11905982/java-how-to-move-a-file-into-a-zip-file