Java創建文件 - xigang365

完整代碼#

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 CreateNewFile{
    public static void main(String[] args) throws IOException   {
        createFileUsingFileClass();
        createFileUsingFileOutputStreamClass();
        createFileIn_NIO();
    }
 
    private static void createFileUsingFileClass() throws IOException  {
          File file = new File("c://temp//testFile1.txt");
  
          //建立檔案
          if (file.createNewFile()){
            System.out.println("檔案已建立！");
          }else{
            System.out.println("檔案已存在。");
          }
           
          //寫入內容
          FileWriter writer = new FileWriter(file);
          writer.write("測試資料");
          writer.close();
    }
 
    private static void createFileUsingFileOutputStreamClass() throws IOException {
        String data = "測試資料";
        FileOutputStream out = new FileOutputStream("c://temp//testFile2.txt");
        out.write(data.getBytes());
        out.close();
    }
 
    private static void createFileIn_NIO()  throws IOException {
        String data = "測試資料";
        Files.write(Paths.get("c://temp//testFile3.txt"), data.getBytes());
         
        //或者
         
        List<String> lines = Arrays.asList("第一行", "第二行");
        Files.write(Paths.get("file6.txt"), lines, StandardCharsets.UTF_8,
                StandardOpenOption.CREATE, StandardOpenOption.APPEND);
    }
}