51 lines
1.6 KiB
Java
51 lines
1.6 KiB
Java
package chapter7;
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import java.io.*;
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import java.util.Scanner;
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public class FileOperationHomework {
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public static void main(String[] args) {
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Scanner scanner = new Scanner(System.in);
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// 1. 获取文件名
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System.out.print("请输入文件名：");
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String fileName = scanner.nextLine();
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// 2. 获取要写入的行数
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System.out.print("请输入要写入的行数：");
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int lines = scanner.nextInt();
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scanner.nextLine(); // 消除换行符
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// 3. 写入文件
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try (FileWriter writer = new FileWriter(fileName)) {
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// 循环获取用户输入并写入
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for (int i = 1; i <= lines; i++) {
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System.out.print("请输入第" + i + "行内容：");
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String content = scanner.nextLine();
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writer.write(content + "\n");
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}
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System.out.println("文件写入成功！");
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} catch (IOException e) {
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System.out.println("写入文件出错：" + e.getMessage());
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return; // 如果写入出错，直接返回
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}
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// 4. 读取并显示文件内容
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System.out.println("\n文件内容如下：");
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System.out.println("--------------------");
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try (BufferedReader reader = new BufferedReader(
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new FileReader(fileName))) {
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String line;
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while ((line = reader.readLine()) != null) {
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System.out.println(line);
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}
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System.out.println("--------------------");
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} catch (IOException e) {
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System.out.println("读取文件出错：" + e.getMessage());
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}
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}
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}
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