使用Java进行文件操作，例如读写、移动等案例

原创 ╰+哭是因爲堅強的太久メ 2024-11-23 18:30 27阅读 0赞

在Java中，我们可以使用java.io包中的类来进行文件操作。以下是一些常用的文件操作案例：

1. **读取文件内容**：
```java
import java.io.File;
import java.io.BufferedReader;
import java.io.FileReader;

public class ReadFile {
    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
            BufferedReader br = new BufferedReader(new FileReader(file)); // create a BufferedReader to read from the file

try {
                String line;
                while ((line = br.readLine()) != null) { // read each line until there's no more data
                    System.out.println(line); // print the lines
                }
            } finally {
                if (br != null) { // close the BufferedReader
                    br.close();
                }
            }
        } else {
            System.out.println("File does not exist."); // handle case when file doesn't exist
        }
    }
}
```

2. **写入文件内容**：
```java
import java.io.File;
import java.io.BufferedWriter;

public class WriteToFile {
    public static void main(String[] args) {
        String content = "Hello, World!"; // replace with your content

File file = new File("path_to_your_file.txt"); // replace with your file path

try (BufferedWriter bw = new BufferedWriter(new FileWriter(file)))) { // create a BufferedWriter to write to the file
            bw.write(content); // write the content to the file
        } catch (IOException e) {
            System.out.println("Error occurred while writing to file: " + e.getMessage()); // handle exception when writing to file
        }
    }
}
```

3. **移动文件**：
```java
import java.io.File;
import java.io.IOException;

public class MoveFile {
    public static void main(String[] args) {
        String sourcePath = "path_to_your_source_file.txt"; // replace with your source file path
        String destinationPath = "path_to_your_destination_directory/"; // create a directory for the destination if it doesn't exist

File sourceFile = new File(sourcePath);
        File destinationDirectory = new File(destinationPath);

// Check if source file exists and destination directory is created
        if (sourceFile.exists() && destinationDirectory.mkdir()) {
            try {
                // Move the source file to the destination directory
                sourceFile.renameTo(new File(destinationDirectory.getAbsolutePath(), sourceFile.getName()))); // use the full path of the destination directory

System.out.println("File successfully moved from " + sourcePath + " to " + destinationPath + "."); // print success message
            } catch (IOException e) {
                System.out.println("Error occurred while moving file: " + e.getMessage()); // handle exception when moving file
            }
        } else {
            System.out.println("Failed to move file. Please ensure the source file exists and a destination directory is created."); // print failure message
        }
    }
}
```

请注意，上述代码中的文件路径需要你根据实际情况替换。