Java中IO操作问题：文件读写示例-蒲公英云

Java中IO操作问题：文件读写示例

在Java中，进行文件读写主要涉及到File类和BufferedReader/Writer类。下面是一个简单的读写示例：

创建文件并写入内容：
```java
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class WriteToFile {
public static void main(String[] args) {
// 创建一个新文件
File file = new File(“test.txt”);

    try {
        // 如果文件不存在，创建它
        if (!file.exists()) {
            file.createNewFile();
        }
        // 使用写入流将内容写入文件
        FileWriter writer = new FileWriter(file);
        writer.write("Hello, World!\n");
        writer.close();
        System.out.println("Content written to file successfully.");
    } catch (IOException e) {
        System.err.println("Error occurred while writing to file: " + e.getMessage());
        e.printStackTrace();
    }
}

}


2. **读取文件内容**：
```java
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
public class ReadFromFile {
    public static void main(String[] args) {
        try (BufferedReader reader = new BufferedReader(new FileReader("test.txt")))) {
            String line;
            while ((line = reader.readLine()) != null)) {
                System.out.println(line);
            }
            System.out.println("File content read successfully.");
        } catch (IOException e) {
            System.err.println("Error occurred while reading from file: " + e.getMessage());
            e.printStackTrace();
        }
    }
}