如何使用 inputStream 作为 outputStream 的文本？ [复制]答案

【问题标题】：How do I use an inputStream as the text to an outputStream? [duplicate]如何使用 inputStream 作为 outputStream 的文本？ [复制]
【发布时间】：2017-12-14 10:30:26
【问题描述】：

我有两个文件，GettysburgAddress.txt，其中写入了葛底斯堡地址，以及 GettysburgAddressCopy.txt，这是一个空的文本文件，我应该用葛底斯堡地址填写每个句子，直到它的句号，在不同的线上。所以我想到了这个

import java.io.PrintWriter;`
import java.io.FileNotFoundException;v`
import java.util.Scanner;`
import java.io.File;

public class UltimateTextFileOutputDemo

{

    public static void main(String[] args)
    {
        String writtenFileName = "C:\\Documents and Settings\\GettysburgAddressCopy.txt";
        PrintWriter outputStream = null;
        try
        {
            outputStream = new PrintWriter(writtenFileName);
        }
        catch (FileNotFoundException e)
        {
            System.out.println("Error opening the file" + writtenFileName);
            System.exit(0);
        }


        String readFileName = "C:\\Documents and Settings\\GettysburgAddress.txt";
        Scanner inputStream = null;
        try
        {
            inputStream = new Scanner(new File(readFileName));
        }
        catch (FileNotFoundException e)
        {
            System.out.println("Error opening the file " +
                            readFileName);
           System.exit(0);
        }
        while (inputStream.hasNextLine())
        {
            inputStream.useDelimiter(".");            // setting the period as the delimiter of the read piece of text, I'm sure it gets a single, complete sentence
            String line = inputStream.nextLine();
            outputStream.println(line);
        }
        outputStream.close();
        inputStream.close();

        System.out.println("The Gettysburg Address was written to " + writtenFileName);

    }
}

运行时，如果 GettysburgAddressCopy.txt 尚不存在，程序会正确创建它，但不会用语音填充它。我意识到代码天真都在三行中

inputStream.useDelimiter(".");
String line = inputStream.nextLine();
outputStream.println(line);

但是，正确的代码是什么？非常感谢您给我最好的建议。

【问题讨论】：

标签： java inputstream outputstream

【解决方案1】：

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

public class UltimateTextFileOutputDemo

{

    public static void main(String[] args)
    {
        String writtenFileName = "D:\\testdump\\GettysburgAddressCopy.txt";
        PrintWriter outputStream = null;
        try
        {
            outputStream = new PrintWriter(writtenFileName);
        }
        catch (FileNotFoundException e)
        {
            System.out.println("Error opening the file" + writtenFileName);
            System.exit(0);
        }


        String readFileName = "D:\\testdump\\GettysburgAddress.txt";
        Scanner inputStream = null;
        try
        {
            inputStream = new Scanner(new File(readFileName));
        }
        catch (FileNotFoundException e)
        {
            System.out.println("Error opening the file " +
                            readFileName);
           System.exit(0);
        }
        inputStream.useDelimiter("\\.");  
        while (inputStream.hasNextLine())
        {
                      // setting the period as the delimiter of the read piece of text, I'm sure it gets a single, complete sentence
            String line = inputStream.next();
            outputStream.println(line);
        }
        outputStream.close();
        inputStream.close();

        System.out.println("The Gettysburg Address was written to " + writtenFileName);

    }
}

【讨论】：