Question

我想将字符的名称和性别导出到文本文件中。此外，我需要在Mac和PC计算机上导出。我尝试了各种方法，但没有一种方法适用于我，或者我可能将它们放错了。

我尝试改变了我的代码：

import java.util.Scanner;
import java.io.PrintWriter;
import java.io.File;
import java.util.Scanner;

public class Character {

    public static void main (String[] args) {
        String characterGender;
        String characterName;

        Scanner scan = new Scanner(System.in);

        System.out.println("Welcome to Ricardo's character creator!");

        System.out.println("Is your character a boy or a girl?");
        characterGender = scan.nextLine();

        if (characterGender.equals("girl"))  {
             System.out.println("Awesome! Please enter her name: ");
             characterName = scan.nextLine();
        } else {
             System.out.println("Awesome! Please enter his name: ");
             characterName = scan.nextLine();
        }

        System.out.print("Alright! " + characterName + " has been created!");

        PrintWriter out = new PrintWriter("Character.txt");
        out.println(characterName);
        out.println(characterGender);
        out.close();

    }
}

我收到这样的错误：

Character.java:34：错误：未报告的异常FileNotFoundException;必须被抓或宣布被抛出。

Answer 1

您需要处理FileNotFoundException。这可以通过以下方式完成：

捕获异常（首选方法）：

PrintWriter out;
try {
    out = new PrintWriter("Character.txt");
    out.println(characterName);
    out.println(characterGender);
    out.close();
} catch (FileNotFoundException e) {
    System.err.println("File doesn't exist");
    e.printStackTrace();
}

或抛出异常：

public static void main (String[] args) throws FileNotFoundException

注意：两种情况都必须包含import java.io.FileNotFoundException;。

以下是Exceptions上的一些java文档。

Answer 2

尝试使用文件编写器而不是print Writer。下面是我的示例代码，希望你不要介意这个硬解释。

String filetowrite = "C:/Users/Desktop/test.txt"; // Point to your location
FileWriter fw = new FileWriter(filetowrite);
fw.write("Hello, This is the test");
fw.close();

Answer 3

由于您从Console＆amp; amp;读取数据将其写入文件建议使用BufferedReader＆amp; BufferedWriter 。处理异常＆amp;如果您想使用Log4j添加日志文件中发生的异常的详细信息，您可以执行以下操作：

BufferedReader br = null;
BufferedWriter bw = null
Logger logger = LogManager.getLogger(Character.class); 
try {
    String data;
    br = new BufferedReader(new InputStreamReader(System.in));
    File file = new File("Character.txt");
    // if file doesn't exists, then create it
    if (!file.exists()) {
        file.createNewFile();
    }

    FileWriter fw = new FileWriter(file.getAbsoluteFile());
    bw = new BufferedWriter(fw);

    while ((data = br.readLine()) != null) {
        System.out.println(data);
        bw.write(data);
    }
} catch (IOException e) {
    StringWriter() stack = new StringWriter();
    e.printStackTrace(new PrintWriter(stack));
    logger.fatal(stack.toString(), Character.class);
} finally {
    try {
        if (br != null && bw != null){
            bw.close();
            br.close();
        }
    } catch (IOException ex) {
        StringWriter() stack = new StringWriter();
        e.printStackTrace(new PrintWriter(stack));
        logger.fatal(stack.toString(), Character.class);
    }
}

或

您可以使用JDK 1.7以后的try-with-resources，它将负责关闭所使用的资源。在你的情况下，它是一个文件。

try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
    String data;
    File file = new File("Character.txt");
    FileWriter fw = new FileWriter(file.getAbsoluteFile());
    BufferedWriter bw = new BufferedWriter(fw);

    while ((data = br.readLine()) != null) {
        System.out.println(data);
        bw.write(data);
    }
} catch (IOException e) {
    e.printStackTrace();
}

将数据从Java导出到文本文件

3 个答案: