如何创建新文件？(How to create a new file?)
问题描述 (Problem Description)
如何创建新文件？
解决方案 (Solution)
此示例演示了使用File类的File()构造函数和file.createNewFile()方法创建新文件的方法。import java.io.File;
import java.io.IOException;
public class Main {
public static void main(String[] args) {
try {
File file = new File("C:/myfile.txt");
if(file.createNewFile())System.out.println("Success!");
else System.out.println ("Error, file already exists.");
}
catch(IOException ioe) {
ioe.printStackTrace();
}
}
}
结果 (Result)
上面的代码示例将产生以下结果(如果“myfile.txt之前不存在)Success!
以下是文件创建的另一个示例示例import java.io.IOException;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.Arrays;
import java.util.List;
public class JavaApplication1 {
public static void main(String[] args) throws IOException {
createFileUsingFileClass();
createFileUsingFileOutputStreamClass();
createFileIn_NIO();
// TODO code application logic here
}
private static void createFileUsingFileClass() throws IOException {
File file = new File("c://testFile1.txt");
//Create the file
if (file.createNewFile()) {
System.out.println("File is created!");
} else {
System.out.println("File already exists.");
}
//Write Content
FileWriter writer = new FileWriter(file);
writer.write("Test data");
writer.close();
}
private static void createFileUsingFileOutputStreamClass() throws IOException {
String data = "Test data";
FileOutputStream out = new FileOutputStream("c://testFile2.txt");
out.write(data.getBytes());
out.close();
}
private static void createFileIn_NIO() throws IOException {
String data = "Test data";
Files.write(Paths.get("c://testFile3.txt"), data.getBytes());
List lines = Arrays.asList("1st line", "2nd line");
Files.write(Paths.get(
"file6.txt"), lines, StandardCharsets.UTF_8,
StandardOpenOption.CREATE, StandardOpenOption.APPEND);
}
}