我创建了一些临时使用的文件，并将它们用作某些方法的输入。我打来电话
deleteOnExit()
在我创建的所有文件上。但仍有一个档案。
我假设这是因为文件仍然在使用，但编译器只在当前行完成后才进入下一行？（单线程）
虽然它实际上不是因为java覆盖问题，但总是只有一个文件。我想了解它为什么会发生，如果我可以使用
Thread.sleep(sometime);
编辑：-
File x = new file("x.txt");
new class1().method1();
创建所有文件（5）后，我刚刚添加了这一行
x.deleteOnExit(); y.deletOnExit() and so on...
删除除最后一个文件之外的所有文件。
确保关闭正在写入文件的任何流。如果流未关闭，则文件将被锁定，删除将返回false。这是我遇到的一个问题。希望这会有所帮助。
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.StringWriter;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class Test {
public static void main(String[] args) {
File reportNew = null;
File writeToDir = null;
BufferedReader br = null;
BufferedWriter bw = null;
StringWriter sw = null;
List<File> fileList = new ArrayList<File>();
SimpleDateFormat ft = new SimpleDateFormat("yyyymmdd_hh_mm_ss_ms");
try {
//Read report.new file
reportNew = new File("c:\\temp\\report.new");
//Create temp directory for newly created files
writeToDir = new File("c:\\temp");
//tempDir.mkdir();
//Separate report.new into many files separated by a token
br = new BufferedReader(new FileReader(reportNew));
sw = new StringWriter();
new StringBuilder();
String line;
int fileCount = 0;
while (true) {
line=br.readLine();
if (line == null || line.contains("%PDF")) {
if (!sw.toString().isEmpty()) {
fileCount++;
File _file = new File(writeToDir.getPath()
+ File.separator
+ fileCount
+ "_"
+ ft.format(new Date())
+ ".htm");
_file.deleteOnExit();
fileList.add(_file);
bw = new BufferedWriter(new FileWriter(_file));
bw.write(sw.toString());
bw.flush();
bw.close();
sw.getBuffer().setLength(0);
System.out.println("File "
+ _file.getPath()
+ " exists "
+ _file.exists());
}
if (line == null)
break;
else
continue;
}
sw.write(line);
sw.write(System.getProperty("line.separator"));
}
} catch ( Exception e) {
e.printStackTrace();
} finally {
if (bw != null) {
try {
bw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
要关闭已在程序中打开的文件，请尝试创建显式终止方法。
因此，请尝试编写以下内容：
public class ClassThatUsesFile {
private String filename;
private BufferReader reader;
public ClassThatUsesFile (String afile) {
this.filename = afile;
this.reader = new BufferReader(new FileReader(afile));
}
// try-finally block guarantees execution of termination method
protected void terminate() {
try {
// Do what must be done with your file before it needs to be closed.
} finally {
// Here is where your explicit termination method should be located.
// Close or delete your file and close or delete your buffer reader.
}
}
}
这里没问题。 deleteOnExit() 对我来说就像一个魅力。
File file = new File(UUID.randomUUID().toString() + ".html");
file.deleteOnExit();
// open file here
// process file here
// flush/close file here