我相信这个问题有一个相当简单的答案,所以我们开始吧。
我正在尝试使用 FileWriter 将文本写入文件。我的程序从用户指定的现有文件中读取文本,然后询问是将文本打印到控制台还是新文件,也由用户命名。
我相信我的问题是将 FileWriter 传递给“FileOrConsole”方法。我没有在“FileOrConsole”方法中正确传递或声明 FileWriter 吗?该文件始终被创建,但没有写入任何内容。
这是代码:
import java.io.*;
import java.util.*;
public class Reader {
public static void main(String[] args) throws IOException {
Scanner s = null, input = new Scanner(System.in);
BufferedWriter out = null;
try {
System.out.println("Would you like to read from a file?");
String answer = input.nextLine();
while (answer.startsWith("y")) {
System.out.println("What file would you like to read from?");
String file = input.nextLine();
s = new Scanner(new BufferedReader(new FileReader(file)));
System.out
.println("Would you like to print file output to console or file?");
FileOrConsole(input.nextLine(), s, input, out);
System.out
.println("\nWould you like to read from the file again?");
answer = input.nextLine();
}
if (!answer.equalsIgnoreCase("yes")) {
System.out.println("Goodbye!");
}
} catch (IOException e) {
System.out.println("ERROR! File not found!");
// e.printStackTrace();
} finally {
if (s != null) {
s.close();
}
if (out != null) {
out.close();
}
}
}
public static void FileOrConsole(String response, Scanner s, Scanner input,
BufferedWriter out) {
if (response.equalsIgnoreCase("console")) {
while (s.hasNext()) {
System.out.println(s.nextLine());
}
} else if (response.equalsIgnoreCase("file")) {
System.out.println("Name of output file?");
response = input.nextLine();
try {
out = new BufferedWriter(new FileWriter(response));
} catch (IOException e) {
e.printStackTrace();
}
while (s.hasNext()) {
try {
out.write(s.nextLine());
out.newLine();
} catch (IOException e) {
e.printStackTrace();
}
}
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
} else {
System.out.println("Sorry, invalid response. File or console?");
response = input.nextLine();
FileOrConsole(response, s, input, out);
}
}
}