利用Java进行文件操作：基本操作与高级应用

原创小灰灰 2024-11-01 20:39 11阅读 0赞

Java提供了多种方式来处理文件和目录，包括基本的文件读写操作以及更高级的应用，如文件过滤、文件属性管理等。以下是一些基本操作和高级应用的示例：

###基本操作####1. 创建和删除文件```javaimport java.io.File;
import java.io.IOException;

public class FileOperations {
 public static void main(String[] args) {
File file = new File("example.txt");
// 创建文件 try {
 boolean isCreated = file.createNewFile();
if (isCreated) {
 System.out.println("文件创建成功");
} else {
 System.out.println("文件已存在");
 }
} catch (IOException e) {
e.printStackTrace();
 }
// 删除文件 boolean isDeleted = file.delete();
if (isDeleted) {
 System.out.println("文件删除成功");
} else {
 System.out.println("文件删除失败");
 }
 }
}
```####2.读取文件```javaimport java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class ReadFile {
 public static void main(String[] args) {
String path = "example.txt";
 try (BufferedReader reader = new BufferedReader(new FileReader(path))) {
String line;
 while ((line = reader.readLine()) != null) {
 System.out.println(line);
 }
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```####3.写入文件```javaimport java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class WriteFile {
 public static void main(String[] args) {
String path = "example.txt";
String content = "Hello, World!";
 try (BufferedWriter writer = new BufferedWriter(new FileWriter(path))) {
 writer.write(content);
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```### 高级应用####1.复制文件```javaimport java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class CopyFile {
 public static void main(String[] args) {
String sourcePath = "source.txt";
String destPath = "destination.txt";
 try (InputStream in = new FileInputStream(sourcePath);
OutputStream out = new FileOutputStream(destPath)) {
byte[] buffer = new byte[1024];
int length;
 while ((length = in.read(buffer)) >0) {
out.write(buffer,0, length);
 }
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```####2.移动文件```javaimport java.io.File;

public class MoveFile {
 public static void main(String[] args) {
File source = new File("source.txt");
File destination = new File("destination.txt");
if (source.renameTo(destination)) {
 System.out.println("文件移动成功");
} else {
 System.out.println("文件移动失败");
 }
 }
}
```####3.过滤文件```javaimport java.io.File;
import java.io.FilenameFilter;

public class FilterFiles {
 public static void main(String[] args) {
File dir = new File(".");
FilenameFilter filter = (dir1, name) -> name.endsWith(".txt");
File[] files = dir.listFiles(filter);
if (files != null) {
 for (File file : files) {
 System.out.println(file.getName());
 }
 }
 }
}
```####4. 获取文件属性```javaimport java.io.File;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.io.IOException;

public class FileAttributes {
 public static void main(String[] args) {
File file = new File("example.txt");
 try {
 BasicFileAttributes attrs = Files.readAttributes(Paths.get(file.getAbsolutePath()), BasicFileAttributes.class);
 System.out.println("文件大小: " + attrs.size());
 System.out.println("最后修改时间: " + attrs.lastModifiedTime());
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```这些示例涵盖了Java中文件操作的基本和高级应用。你可以根据需要调整和扩展这些代码。