如果我想在
C:/a/b/test.txtFile f = new File("C:/a/b/test.txt");
另外，我想使用
FileOutputStream最好的方法是：
String path = "C:" + File.separator + "hello" + File.separator + "hi.txt";
// Use relative path for Unix systems
File f = new File(path);
f.getParentFile().mkdirs();
f.createNewFile();
File#mkdirs()File f = new File("C:/a/b/test.txt");
f.getParentFile().mkdirs();
// ...
PathPathsFilesimport java.io.IOException;
import java.nio.file.FileAlreadyExistsException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
public class CreateFile {
public static void main(String[] args) throws IOException {
Path path = Paths.get("/tmp/foo/bar.txt");
Files.createDirectories(path.getParent());
try {
Files.createFile(path);
} catch (FileAlreadyExistsException e) {
System.err.println("already exists: " + e.getMessage());
}
}
}
用途：
File f = new File("C:\\a\\b\\test.txt");
f.mkdirs();
f.createNewFile();
请注意，我将 Windows 文件系统中的路径的正斜杠更改为双反斜杠。这将在给定路径上创建一个空文件。
String path = "C:"+File.separator+"hello";
String fname= path+File.separator+"abc.txt";
File f = new File(path);
File f1 = new File(fname);
f.mkdirs() ;
try {
f1.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
这应该在目录中创建一个新文件
令人惊讶的是，许多答案都没有给出完整的工作代码。这是：
public static void createFile(String fullPath) throws IOException {
File file = new File(fullPath);
file.getParentFile().mkdirs();
file.createNewFile();
}
public static void main(String [] args) throws Exception {
String path = "C:/donkey/bray.txt";
createFile(path);
}
在指定路径创建新文件
import java.io.File;
import java.io.IOException;
public class CreateNewFile {
public static void main(String[] args) {
try {
File file = new File("d:/sampleFile.txt");
if(file.createNewFile())
System.out.println("File creation successfull");
else
System.out.println("Error while creating File, file already exists in specified path");
}
catch(IOException io) {
io.printStackTrace();
}
}
}
程序输出：
文件创建成功
创建一个文件并在其中写入一些字符串：
BufferedWriter bufferedWriter = Files.newBufferedWriter(Paths.get("Path to your file"));
bufferedWriter.write("Some string"); // to write some data
// bufferedWriter.write(""); // for empty file
bufferedWriter.close();
这适用于 Mac 和 PC。
要使用 FileOutputStream，请尝试以下操作：
public class Main01{
public static void main(String[] args) throws FileNotFoundException{
FileOutputStream f = new FileOutputStream("file.txt");
PrintStream p = new PrintStream(f);
p.println("George.........");
p.println("Alain..........");
p.println("Gerard.........");
p.close();
f.close();
}
}
当您通过文件输出流写入文件时，将自动创建该文件。但请确保创建了所有必要的目录（文件夹）。
String absolutePath = ...
try{
File file = new File(absolutePath);
file.mkdirs() ;
//all parent folders are created
//now the file will be created when you start writing to it via FileOutputStream.
}catch (Exception e){
System.out.println("Error : "+ e.getmessage());
}
我在这里解决同样的问题，我终于解决了。
目标是在文件夹中创建一个文件（例如 .txt 文件）。
你需要的东西：
而不是这个：
File f = new File("C:/a/b/test.txt");
尝试
//get the file's absolute path. You could input it yourself
// but I think it is better to have a function to handle
// system rules on how to format the path string
String myFolder = "b";
String myFile = "test.txt";
String folderPath = myFolder.getAbsolutePath(); //will get the entire path for you
String pathToFile = folderPath + File.separator + myFile;
// this will probably throw a exception, you want to make sure you handle it
try {
File newFile = new File(pathToFile);
if (newFile.createNewFile()) {
System.out.println("bwahahah success");
}
else {
System.out.println("file creation failed");
}
}catch(IOException e) {
System.out.println(e.getMessage()); // you will need to print the message in order to get some insight on what the problem is.
}
// you can also add a throw if within the if statement with other checks in order to know where the error is coming from, but to keep it short this is the gist of it.
// Really hope this will assist anyone that stumbles upon this same issue.
其他供进一步阅读的资源：有关 java 路径和文件的所有内容
如果有什么我可能忽略的地方请评论，让我吸收一些知识
只是将一些答案结合在一起。
import java.io.BufferedWriter;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
class Scratch {
public static void main(String[] args) {
String fileTargetLocation = "C:\\testing\\";
String fileNameAndExtension = "test.txt";
boolean fileCreated = createFile(fileTargetLocation, fileNameAndExtension);
if (fileCreated) {
String stringForFile = "This is some test text to write into the file.";
writeIntoFile(fileTargetLocation, fileNameAndExtension, stringForFile);
}
}
/**
* Attempts to create a file at the given location, with the given file name and desired extension.
*
* @param fullPath full path to folder in which the file needs to be created, example: C:\testing\
* (ending with a foreword slash)
* @param fileNameAndExtension file name and desired extension. Example: environment.properties, test.txt
* @return successful file creation boolean
*/
public static boolean createFile(String fullPath, String fileNameAndExtension) {
try {
return new File(fullPath + fileNameAndExtension).createNewFile();
} catch (IOException io) {
io.printStackTrace();
}
return false;
}
/**
* Attempt to write into the given file.
*
* @param fullPath full path to folder in which the file needs to be created, example: C:\testing\
* (ending with a foreword slash)
* @param fileNameAndExtension file name and extension. Example: environment.properties, test.txt
* @param whatToWriteToFile string to write to the file
*/
public static void writeIntoFile(String fullPath, String fileNameAndExtension, String whatToWriteToFile) {
try (BufferedWriter bufferedWriter = Files.newBufferedWriter(Paths.get(fullPath + fileNameAndExtension))) {
bufferedWriter.write(whatToWriteToFile);
} catch (IOException io) {
io.printStackTrace();
}
}
}