Java中IO流的读写操作实战案例

原创迈不过友情╰ 2024-11-01 21:00 19阅读 0赞

Java中的IO流（输入/输出流）是处理文件和数据流的基础。以下是一些常见的IO流读写操作的实战案例：

###1.读取文件内容```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"; //替换为你的文件路径 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```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"; //替换为你的文件路径String content = "Hello, World!"; //要写入的内容 try (BufferedWriter writer = new BufferedWriter(new FileWriter(path))) {
 writer.write(content);
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```###3.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"; //源文件路径String destPath = "path/to/destination/file.txt"; //目标文件路径 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.读取二进制文件```javaimport java.io.FileInputStream;
import java.io.IOException;

public class ReadBinaryFileExample {
 public static void main(String[] args) {
String path = "path/to/your/file.bin"; //替换为你的二进制文件路径 try (FileInputStream fis = new FileInputStream(path)) {
byte[] data = new byte[(int) fis.available()];
 fis.read(data);
//处理数据} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```###5.写入二进制文件```javaimport java.io.FileOutputStream;
import java.io.IOException;

public class WriteBinaryFileExample {
 public static void main(String[] args) {
String path = "path/to/your/file.bin"; //替换为你的二进制文件路径byte[] data = {0x01,0x02,0x03}; //要写入的二进制数据 try (FileOutputStream fos = new FileOutputStream(path)) {
 fos.write(data);
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```这些案例展示了Java中IO流的基本使用。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资源管理。