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| 11. 53. 1. 确保文件存在 |
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import java.io.File;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;
public class GuaranteeAFile {
public static void main(String[] args) {
String filename = "C:/myFile.txt";
File aFile = new File(filename);
if (aFile.isDirectory()) {
System.out.println("The path " + aFile.getPath()
+ " does not specify a file. Program aborted.");
System.exit(1);
}
if (!aFile.isFile()) {
aFile = aFile.getAbsoluteFile();
File parentDir = new File(aFile.getParent());
if (!parentDir.exists()) {
parentDir.mkdirs();
}
}
FileOutputStream outputFile = null;
try {
outputFile = new FileOutputStream(aFile, true);
} catch (FileNotFoundException e) {
e.printStackTrace(System.err);
}
}
}
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