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Difference between methods of creating files in java

王林

Release： 2019-11-28 13:57:43

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Difference between methods of creating files in java

区别：

mkdir和mkdirs：mkdir只能用来创建文件夹，且只能创建一级目录；

mkdirs同样只能用来创建文件夹，可创建多级目录，如果上级不存在，就会自动创建。

createNewFile:只能用来创建文件，且只能在已存在的目录下创建文件。

一般情况下配合使用，附上一段代码，会在自定义的目录下创建名为111的docx文件,将inputString字符串内容写入其中。

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示例演示如下：

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class Modify {

    public static void main(String[] args) throws IOException {
        String path = "F:\\Users\\yyy\\Desktop\\111.docx";
        Modify modify = new Modify();
        modify.create("hhh",path);
    }

    /**
     *
     * @param inputString 需写入的字符串内容
     * @param path 文件创建的路径
     * @throws IOException
     */
    private void create(String inputString,String path) throws IOException {
        String newPath = path.substring(0,path.lastIndexOf("\\"));
        File file = new File(newPath);
        if (!file.exists()){
            file.mkdirs();
        }
        File newFile = new File(path);
        if (!newFile.exists()){
            newFile.createNewFile();
        }
        ByteArrayInputStream input = new ByteArrayInputStream(inputString.getBytes());
        int index;
        byte[] bytes = new byte[1024];
        FileOutputStream fs = new FileOutputStream(path);
        while ((index = input.read(bytes)) != -1) {
            fs.write(bytes, 0, index);
            fs.flush();
        }
        fs.close();
        input.close();
    }
}

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