Java的IO流操作：文件读写示例

原创爱被打了一巴掌 2024-11-07 11:09 9阅读 0赞

Java的IO流操作是处理文件读写的基础。以下是一些基本的文件读写示例，包括使用`FileInputStream`、`FileOutputStream`、`BufferedReader`和`BufferedWriter`等类。

###1.写入文件```javaimport java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class FileWriteExample {
 public static void main(String[] args) {
String data = "Hello, this is a test data for file writing.";
String filePath = "example.txt";

try (BufferedWriter writer = new BufferedWriter(new FileWriter(filePath))) {
 writer.write(data);
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```###2.读取文件```javaimport java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class FileReadExample {
 public static void main(String[] args) {
String filePath = "example.txt";

try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
String line;
 while ((line = reader.readLine()) != null) {
 System.out.println(line);
 }
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```###3.追加写入文件```javaimport java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class FileAppendExample {
 public static void main(String[] args) {
String data = "This is additional data to append.";
String filePath = "example.txt";

try (BufferedWriter writer = new BufferedWriter(new FileWriter(filePath, true))) {
 writer.newLine();
 writer.write(data);
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```###4.读取和写入二进制文件```javaimport java.io.*;

public class BinaryFileExample {
 public static void main(String[] args) {
String binaryFilePath = "example.bin";
byte[] data = {10,20,30,40,50};

//写入二进制文件 try (FileOutputStream fos = new FileOutputStream(binaryFilePath)) {
 fos.write(data);
} catch (IOException e) {
e.printStackTrace();
 }

//读取二进制文件 try (FileInputStream fis = new FileInputStream(binaryFilePath)) {
byte[] buffer = new byte[data.length];
int bytesRead = fis.read(buffer);
 for (int i =0; i < bytesRead; i++) {
 System.out.print(buffer[i] + " ");
 }
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```这些示例展示了如何使用Java的IO流进行基本的文件读写操作。记得在实际应用中处理异常，并在操作完成后关闭流以释放系统资源。