Java File Operations

最新推荐文章于 2023-06-16 12:25:56 发布

海上的程序猿

最新推荐文章于 2023-06-16 12:25:56 发布

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CC 4.0 BY-SA版权

分类专栏： java 文章标签： Java 文件操作

本文链接：https://blog.youkuaiyun.com/u014487025/article/details/90449455

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该博客聚焦Java文件操作，涵盖文件写入、内容追加、读取、删除、复制等基础操作，还包括创建临时文件、获取文件修改时间与大小、文件重命名、设置只读等功能，为Java开发者提供全面的文件操作指南。

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文件写入内容

public void fileWriter(String fileName, String fileContent) {
    try {
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(fileName));
        bufferedWriter.write(fileContent);
        bufferedWriter.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

文件内容追加

    public void fileAddWriter(String fileName, String fileConten){
        try {
            BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(fileName, true));
            bufferedWriter.write(fileConten);
            bufferedWriter.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

读取文件内容

    public void fileReader(String fileName) throws IOException {
        try {
            BufferedReader bufferedReader = new BufferedReader(new FileReader(fileName));
            String str;
            while ((str = bufferedReader.readLine()) != null) {
                System.out.println(str);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

文件删除

    public void fileDelete(String fileName){
        File file = new File(fileName);
        if (file.delete())
            System.out.println("删除文件成功...");
        System.out.println("删除文件失败...");
    }

文件复制

    public void copyFile1ToFile2(String fileName1, String fileName2){
        try {
            InputStream inputStream = new FileInputStream(new File(fileName2));
            OutputStream outputStream = new FileOutputStream(new File(fileName1));
            byte[] buf = new byte[1024];
            int len;
            while ((len = inputStream.read(buf)) > 0){
                outputStream.write(buf, 0, len);
            }
            inputStream.close();
            outputStream.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

创建临时文件

    public void createTempFile(String fileName, String fileContent){
        try {
            File temp = File.createTempFile(fileName, ".suffix");
            temp.deleteOnExit();
            BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(temp));
            bufferedWriter.write(fileContent);
            bufferedWriter.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

获取文件最后修改时间

    public String getLastModifiedTime(String fileName){
        File file = new File(fileName);
        Date fileTime = new Date(file.lastModified());
        return fileTime.toString();
    }

获取文件大小

    public long getFileSize(String fileName){
        File file = new File(fileName);
        if (!file.exists() || !file.isFile()){
            return -1;
        }
        return file.length();
    }

文件重命名

    public void renameFile(String oldName, String newName){
        File oldFile = new File(oldName);
        File newFile = new File(newName);
        if (oldFile.renameTo(newFile)){
            System.out.println("已重命名！");
        }
        System.out.println("重命名失败！");
    }

设置文件只读

File.setReadOnly()

待定…