【笔记】Java的Files

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前言

Java的Files学习笔记

新建文件

Java11.java
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Path path = Files.createFile(Path.of(<file>));

新建目录

只新建一级目录

Java11.java
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Path path = Files.createDirectory(Path.of(<dir>));

递归新建多级目录

Java11.java
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Path path = Files.createDirectories(Path.of(<dir>));

新建硬链接

Java11.java
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Path path = Files.createLink(Path.of(<link>), Path.of(<file>));

删除文件或目录

Java11.java
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Files.delete(Path.of(<file>));

存在时才删除

Java11.java
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boolean success = Files.deleteIfExists(Path.of(<file>));

复制文件或目录

Java11.java
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Path path = Files.copy(Path.of(<file_source>), Path.of(<file_target>));

移动或重命名文件或目录

Java11.java
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Path path = Files.move(Path.of(<file_source>), Path.of(<file_target>));

获取文件系统

Java11.java
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FileStore fileStore = Files.getFileStore(Path.of(<file>));

判断是否是相同文件

Java11.java
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boolean yes = Files.isSameFile(Path.of(<file_1>), Path.of(<file_2>));

判断是否是隐藏文件

Java11.java
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boolean yes = Files.isHidden(Path.of(<file>));

获取Content-Type

Java11.java
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String contentType = Files.probeContentType(Path.of(<file>));

获取属主和属组

Java11.java
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String owner = Files.getOwner(Path.of(<file>)).name();

判断是否是软链接

Java11.java
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boolean yes = Files.isSymbolicLink(Path.of(<file>));

判断是否是目录

Java11.java
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boolean yes = Files.isDirectory(Path.of(<file>));

获取上次修改时间

Java11.java
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FileTime lastModifiedTime = Files.getLastModifiedTime(Path.of(<file>));

修改上次修改时间

<timestamp>：毫秒时间戳

Java11.java
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Path path = Files.setLastModifiedTime(Path.of(<file>), FileTime.fromMillis(<timestamp>));

获取文件大小

Java11.java
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long size = Files.size(Path.of(<file>));

判断文件是否存在

Java11.java
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boolean exist = Files.exists(Path.of(<file>));

判断文件是否不存在

Java11.java
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boolean notExist = Files.notExists(Path.of(<file>));

判断文件权限

判断是否可读

Java11.java
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boolean ok = Files.isReadable(Path.of(<file>));

判断是否可写

Java11.java
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boolean ok = Files.isWritable(Path.of(<file>));

判断是否可执行

Java11.java
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boolean ok = Files.isExecutable(Path.of(<file>));

读取文件

读取所有内容

Java11.java
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String result = Files.readString(Path.of(<file>));
指定编码
Java11.java
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String result = Files.readString(Path.of(<file>), StandardCharsets.UTF_8);

读取行

Java11.java
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List<String> result = Files.readAllLines(Path.of(<file>));
指定编码
Java11.java
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List<String> result = Files.readAllLines(Path.of(<file>), StandardCharsets.UTF_8);

写入文件

写入字节数组

覆盖写入
Java11.java
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Files.write(Path.of(<file>), "".getBytes());
追加写入
Java11.java
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Files.write(Path.of(<file>), "".getBytes(), StandardOpenOption.APPEND);

写入字符串

覆盖写入
Java11.java
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Files.writeString(Path.of(<file>), "");
追加写入
Java11.java
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Files.writeString(Path.of(<file>), "", StandardOpenOption.APPEND);
指定编码
Java11.java
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Files.writeString(Path.of(<file>), "", StandardCharsets.UTF_8);

I/O流

获取BufferedReader

Java11.java
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BufferedReader bufferedReader = Files.newBufferedReader(Path.of(<file>));

获取BufferedWriter

Java11.java
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BufferedWriter bufferedWriter = Files.newBufferedWriter(Path.of(<file>));

从输入流读取数据

Java11.java
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long result = Files.copy(Files.newInputStream(Path.of(<file_source>)), Path.of(<file_target>));

数据写入到输出流

Java11.java
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long result = Files.copy(Path.of(<file_source>), Files.newOutputStream(Path.of(<file_target>)));

获取目录下的所有文件和目录

  • 必须传递目录，否则会报错
Java11.java
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Stream<Path> list = Files.list(Path.of(<dir>));

搜索文件

  • Lambda表达式中返回true表示匹配成功，返回false表示匹配失败

2：递归深度

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Stream stream = Files.find(Path.of("<dir>"), 2, ((path, basicFileAttributes) -> {
    if (path.getFileName().toString().equals("<file_name>")) {
        return true;
    }
    return false;
}));

获取文件每一行内容

  • 必须传递文件，否则会报错
Java11.java
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Stream<String> lines = Files.lines(Path.of(<file>));

完成