编写一个Java程序将文件内容读出并显示到屏幕上

Question

编写一个名为number1.txt的txt文档，内容包括100到109十个整数。编写一个Java程序将文件内容读出并显示到屏幕上，并以相反的顺序写入到文件number2.txt中。

Answer 1

package com.uf.test;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Arrays;

public class Home {

public static void main(String[] args) {

    String inputFile = "C:\\Users\\wushucheng\\Desktop\\number1.txt";
    String outputFile = "C:\\Users\\wushucheng\\Desktop\\number2.txt";
    String content = getFileContent(inputFile);
    System.out.println(content);

    String[] array = content.split(" ");
    String[] newArray = new String[array.length];
    for (int i = 0; i < array.length; i++) {
        newArray[newArray.length - i - 1] = array[i];
    }
    String newContent = Arrays.toString(newArray).replaceAll("\\[|\\]", "");
    createFile(outputFile, newContent);
}

public static String getFileContent(String filePath){

    BufferedReader reader = null;
    try {
        reader = new BufferedReader(new FileReader(filePath));
        StringBuffer stringBuffer = new StringBuffer();
        String temp = null;
        try {
            while((temp = reader.readLine()) != null){
                stringBuffer.append(temp);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        return stringBuffer.toString();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } finally{
        if(reader != null){
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    return null;
}

public static void createFile(String filePath, String content){
    PrintWriter writer = null;
    try {
        writer = new PrintWriter(new FileWriter(filePath));
        writer.write(content);
        writer.flush();
    } catch (IOException e) {
        e.printStackTrace();
    } finally{
        if(writer != null){
            writer.close();
        }
    }
}

}