Java多文件读写：IO流、文件操作的实战案例

原创痛定思痛。 2024-11-08 22:48 17阅读 0赞

Java中进行文件读写操作主要依赖于`java.io`包中的类。以下是一些常见的文件操作的实战案例，包括IO流的使用。

###1.读取文件内容#### 使用`BufferedReader`读取文本文件```javaimport java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class ReadFileExample {
 public static void main(String[] args) {
String path = "path/to/your/file.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();
 }
 }
}
```###2.写入文件内容#### 使用`BufferedWriter`写入文本文件```javaimport java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class WriteFileExample {
 public static void main(String[] args) {
String path = "path/to/your/file.txt";
String content = "Hello, World!";
 try (BufferedWriter writer = new BufferedWriter(new FileWriter(path))) {
 writer.write(content);
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```###3.复制文件#### 使用`FileInputStream`和`FileOutputStream`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 CopyFileExample {
 public static void main(String[] args) {
String sourcePath = "path/to/source/file.txt";
String destPath = "path/to/destination/file.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();
 }
 }
}
```###4.追加内容到文件#### 使用`FileWriter`的追加模式```javaimport java.io.FileWriter;
import java.io.IOException;

public class AppendToFileExample {
 public static void main(String[] args) {
String path = "path/to/your/file.txt";
String content = "This is appended content.";
 try (FileWriter writer = new FileWriter(path, true)) { // true for append mode writer.write(content);
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```###5.移动文件#### 使用`Files.move`方法```javaimport java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;

public class MoveFileExample {
 public static void main(String[] args) {
String sourcePath = "path/to/source/file.txt";
String destPath = "path/to/destination/file.txt";
 try {
Files.move(Paths.get(sourcePath), Paths.get(destPath), StandardCopyOption.REPLACE_EXISTING);
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```这些案例涵盖了基本的文件读写操作。在实际应用中，你可能需要根据具体需求调整代码，比如处理大文件时使用缓冲区，或者在读写过程中添加异常处理和日志记录等。