Java中IO流操作：文件读写实战案例

原创 Myth丶恋晨 2024-09-18 03:09 77阅读 0赞

在Java中，IO（Input/Output）流是用于处理数据输入和输出的类。下面是一些常见的文件读写实战案例：

1. 文件读取：
```java
import java.io.File;
import java.io.FileInputStream;

public class FileReader {
    public static void main(String[] args) {
        File file = new File("path_to_your_file.txt"); // Replace with your file path

if (file.exists()) { // Check if the file exists
            try (FileInputStream fis = new FileInputStream(file)) { // Create a FileInputStream for reading
                byte[] buffer = new byte[1024]; // Buffer to read data

int bytesRead;
                while ((bytesRead = fis.read(buffer))) != -1) { // Read until end of file or -1 (EOF)
                    System.out.println(new String(buffer, 0, bytesRead))); // Print read data
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else {
            System.out.println("File does not exist.");
        }
    }
}
```
2. 文件写入：
```java
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class FileWriterExample {
    public static void main(String[] args) {
        File file = new File("path_to_your_file.txt"); // Replace with your file path

try (FileWriter writer = new FileWriter(file)) { // Create a FileWriter for writing
            writer.write("Hello, World! This is a sample file written using FileWriter.\n"); // Write data to the file
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
```
这些案例展示了如何使用Java的IO流操作进行文件的读写。记得在实际项目中，还需要处理可能的异常情况。