如何使用JAVA SE 7从控制台向system.in发送null

Question

我正在尝试编写一个简单的类，它从控制台获取输入，然后将其输出到平面文件。

目前我需要输入一个特定的字符串，以表明控制台的输入已经完成。我正在使用BufferedRead对象，该对象在从非控制台流中读取EOF时返回NULL，并且希望从控制台执行类似操作。任何人都可以给我一些指示如何做到这一点。

我需要从键盘发送/输入System.in的简单转义序列吗？

代码如下所示：

package writefilestr;

import java.io.*;

public class WriteFileStr
{

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)
    {
        // Ensure that the we have a command line parameter
        if (args.length != 1)
        {
            System.out.println("UASAGE: java WriteFileStr filename");
        }
        else
        {   
            String[] inputBuffer = new String[100];
            int stCount = 0;

            System.out.println("Input Some Strings:");
            try(BufferedReader in = new BufferedReader(new InputStreamReader(System.in)))
            {
                String st = new String();
                boolean eof = false;

                do
                {
                    if (!(st = in.readLine()).equalsIgnoreCase("EOF"))
                    {
                        inputBuffer[stCount++] = st;
                    }
                    else
                    {
                        eof = true;
                    }

                } while(!eof);
            }
            catch (IOException e)
            {
                System.out.println(e);
            }

            try(BufferedWriter wr = new BufferedWriter(new FileWriter(args[0])))
            {      
                for (int i = 0; i < stCount; i++)
                {
                    wr.write(inputBuffer[i]); 
                    wr.newLine();
                }
            }
            catch (FileNotFoundException e)
            {
                System.out.println("FileNotFoundException : "+e);
            }
            catch (IOException e)
            {
                System.out.println("IOException : "+e);
            }
        }
    }
}

package writefilestr; import java.io.*; public class WriteFileStr { /** * @param args the command line arguments */ public static void main(String[] args) { // Ensure that the we have a command line parameter if (args.length != 1) { System.out.println("UASAGE: java WriteFileStr filename"); } else { String[] inputBuffer = new String[100]; int stCount = 0; System.out.println("Input Some Strings:"); try(BufferedReader in = new BufferedReader(new InputStreamReader(System.in))) { String st = new String(); boolean eof = false; do { if (!(st = in.readLine()).equalsIgnoreCase("EOF")) { inputBuffer[stCount++] = st; } else { eof = true; } } while(!eof); } catch (IOException e) { System.out.println(e); } try(BufferedWriter wr = new BufferedWriter(new FileWriter(args[0]))) { for (int i = 0; i < stCount; i++) { wr.write(inputBuffer[i]); wr.newLine(); } } catch (FileNotFoundException e) { System.out.println("FileNotFoundException : "+e); } catch (IOException e) { System.out.println("IOException : "+e); } } } }