Java中IO流：读写操作实例

原创秒速五厘米 2024-11-08 11:21 67阅读 0赞

Java中的IO流（输入/输出流）是用于处理数据输入和输出的一种方式。Java提供了多种流类来处理不同类型的数据。以下是一些基本的读写操作实例：

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

public class WriteFileExample {
 public static void main(String[] args) {
 try {
 FileWriter writer = new FileWriter("example.txt");
 writer.write("Hello, this is a test.");
 writer.close();
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```####读取文件```javaimport java.io.FileReader;
import java.io.BufferedReader;
import java.io.IOException;

public class ReadFileExample {
 public static void main(String[] args) {
 try {
 BufferedReader reader = new BufferedReader(new FileReader("example.txt"));
String line;
 while ((line = reader.readLine()) != null) {
 System.out.println(line);
 }
 reader.close();
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```###2. 字节流####写入字节数据```javaimport java.io.FileOutputStream;
import java.io.IOException;

public class WriteBytesExample {
 public static void main(String[] args) {
 try {
 FileOutputStream fos = new FileOutputStream("example.bin");
 fos.write("Hello, this is a test.".getBytes());
 fos.close();
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```####读取字节数据```javaimport java.io.FileInputStream;
import java.io.IOException;

public class ReadBytesExample {
 public static void main(String[] args) {
 try {
 FileInputStream fis = new FileInputStream("example.bin");
int content;
 while ((content = fis.read()) != -1) {
 System.out.print((char) content);
 }
 fis.close();
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```###3. 使用缓冲流提高效率####带缓冲的写入```javaimport java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class BufferedWriteExample {
 public static void main(String[] args) {
 try {
 BufferedWriter writer = new BufferedWriter(new FileWriter("example.txt"));
 writer.write("Hello, this is a test.");
 writer.newLine();
 writer.write("Another line.");
 writer.close();
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```####带缓冲的读取```javaimport java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class BufferedReadExample {
 public static void main(String[] args) {
 try {
 BufferedReader reader = new BufferedReader(new FileReader("example.txt"));
String line;
 while ((line = reader.readLine()) != null) {
 System.out.println(line);
 }
 reader.close();
} catch (IOException e) {
e.printStackTrace();
 }
 }
}
```这些是Java中IO流的基本操作。在实际应用中，你可能需要根据具体需求选择合适的流类和方法。记得在操作完成后关闭流，以释放系统资源。