我想读取压缩文件中的CSV文件,并根据某些条件编辑记录。我使用FileSystem类创建压缩文件系统,然后编辑csv文件。我使用下面的代码读取csv文件
public static List<String> getFileList() {
List<String> fileList = new ArrayList<>();
ZipFile zip = null;
try {
zip = new ZipFile(zipFile);
Enumeration<? extends ZipEntry> entries = zip.entries();
while (entries.hasMoreElements()) {
ZipEntry entry = entries.nextElement();
if (entry.getName().contains("**") && !entry.getName().contains("***")) {
fileList.add(entry.getName());
}
}
} catch (IOException e) {
e.printStackTrace();
}
return fileList;
}
public static void modifyTextFileInZip() throws IOException {
Path zipfilePath = Paths.get(zipFile);
try (FileSystem fs = FileSystems.newFileSystem(zipfilePath, null)) {
for (String file : getFileList()) {
Path source = fs.getPath(file);
String tempFileDest = source.getParent().toString() + "/" + "temp_" + source.getFileName();
tempFileDest = tempFileDest.replace(".red", "");
Path temp = fs.getPath(tempFileDest);
editFiles(source, temp);
}
}
}
public static void editFiles(Path source, Path dest) {
CSVReader reader;
try {
reader = new CSVReader(new InputStreamReader(Files.newInputStream(source)));
List<String[]> records = reader.readAll();
Iterator<String[]> iterator = records.iterator();
Optional<String> fileName =
Files.list(source.getParent())
.filter(file -> file.getFileName().toString().endsWith("***") &&
!file.getFileName().toString().endsWith("****"))
.map(file -> file.toString())
.findFirst();
//System.out.println(fileName);
while (iterator.hasNext()) {
String[] record = iterator.next();
String val = null;
if("****".equals(record[5])){
try {
val = fileName.orElseThrow(() -> new RuntimeException("File Not found"));
val = "**" + val;
//System.out.println(val);
} catch(Exception e){
System.out.println("File not Found");
}
record[5] = val;
}
for(String cell: record) {
System.out.print(cell);
}
System.out.println();
}
Files.createFile(dest);
PrintWriter outputFile = new PrintWriter(Files.newOutputStream(dest));
CSVWriter writer = new CSVWriter(outputFile);
writer.writeAll(records);
writer.close();
} catch (Exception e) {
e.printStackTrace();
}
}
错误日志=〉
java.nio.file.FileSystemException: C:\zipfile\P003.zip: The process cannot access the file because it is being used by another process.
at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:86)
at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97)
at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102)
at sun.nio.fs.WindowsFileSystemProvider.implDelete(WindowsFileSystemProvider.java:269)
at sun.nio.fs.AbstractFileSystemProvider.delete(AbstractFileSystemProvider.java:103)
at java.nio.file.Files.delete(Files.java:1126)
at com.sun.nio.zipfs.ZipFileSystem.sync(ZipFileSystem.java:1294)
at com.sun.nio.zipfs.ZipFileSystem.close(ZipFileSystem.java:277)
at com.shrikant.Main.Main2.modifyTextFileInZip(Main2.java:60)
at com.shrikant.EditCsvFilesApplication.main(EditCsvFilesApplication.java:21)
我希望能够读取和编辑文件使用inputStream从路径对象,然后将其传递给CSVReader对象。但当我传递outputStream到CSVWriter,并试图写入数据到临时文件,看不到任何变化内的zip文件。我也得到了一个。tmp(zipfstmp3381860066025396844.tmp)文件生成的每一个我运行我的程序。
我按照这个=〉https://stackoverflow.com/a/43836969/20783127来写这个程序
不知道出了什么问题,我能解释吗?
我正在尝试使用Java中的FileSystem类读取和编辑zip文件中的csv文件,但它不工作
1条答案
按热度按时间gcuhipw91#
您没有
zip.close()
。最好使用 try-with-resources 语法,该语法在抛出异常或{ }
内部返回时也会关闭。