Java中文件操作：读写和错误处理

原创雨点打透心脏的1/2处 2024-09-29 18:09 60阅读 0赞

在Java中，进行文件操作主要包括创建、读取、写入、删除等。同时，我们还需要处理可能出现的错误。

1. 创建文件：
```java
try {
    File file = new File("path_to_your_file");
    if (!file.exists()) { // If file doesn't exist, create it
        boolean created = file.createNewFile();
        if (created) { // If successfully created file, print success message
            System.out.println("File created successfully!");
        }
    }
} catch (IOException e) {
    // Handle file creation errors
    e.printStackTrace();
}
```

2. 读取文件：
```java
try {
    File file = new File("path_to_your_file");
    Scanner scanner = new Scanner(file);
    while (scanner.hasNextLine()) {
        String line = scanner.nextLine();
        System.out.println(line);
    }
    scanner.close(); // Always close the scanner when done
} catch (FileNotFoundException e) {
    // Handle file reading errors
    e.printStackTrace();
}
```

3. 写入文件：
```java
try {
    File file = new File("path_to_your_file");
    FileWriter writer = new FileWriter(file);
    String content = "This is the content to write.";
    writer.write(content); // Write content to file
    writer.close(); // Always close the writer when done
} catch (IOException e) {
    // Handle file writing errors
    e.printStackTrace();
}
```

4. 删除文件：
```java
try {
    File file = new File("path_to_your_file");
    if (file.delete()) { // Delete file if successful
        System.out.println("File deleted successfully!");
    } else { // Handle file deletion failure
        System.out.println("Failed to delete the file!");
    }
} catch (IOException e) {
    // Handle file deletion errors
    e.printStackTrace();
}
```

在处理文件操作时，一定要注意异常的捕获和处理。以上代码示例仅供参考，具体使用时请根据实际情况修改路径。