一道Java命令行的题目

[angel8808]

提示用户开始输入，并将此后的键盘输入内容保存至文件userinput.txt中，直到用户在键盘上输入^z(control键+z键)结束输入，显示userinput.txt全部内容介绍程序运行。关键是^z结束输出怎么实现？？？

[lacus87]

是指这种？
ctrl+z在命令行就是结束输入流的意思，但是必须换行单独使用

import java.util.Scanner;

/*
 * 注意：必须先回车再ctrl+z结束输入,否则当前行不会保存
 */
public class Test {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		StringBuffer sb = new StringBuffer();
		while(in.hasNextLine()){			
			String str = in.nextLine();
			sb.append("\n");
			sb.append(str);
			
		}
		System.out.println(sb.toString());
		//把sb写入文件....
	}
}

[Adebayor]

import java.io.*;
import java.util.*;

public class A {

	public static void main(String[] args) {

		System.out.println("请输入：");
		try {
			Scanner sc = new Scanner(System.in);

			File file = new File("E:/userinput.txt");

			FileWriter fout = new FileWriter(file);

			String str;

			while (sc.hasNext()) {
				str = sc.nextLine();
				str = str + "\r\n";
				fout.write(str);
			}
			fout.close();	
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

[piaolankeke]

确实要单独起行才可以直接读取流判断字符

[xiong_hh]

Scanner 貌似无法扫描一些特殊的组合键，如果要求不是很严格的话可以考虑以下代码：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class ReadAndWrite {
private InputStream is ;
private OutputStream os;
	


	private void init(File inputFile,File outputFile) throws FileNotFoundException{
		if(inputFile==null)
			this.is = System.in;
		else
			this.is = new FileInputStream(inputFile);
		if(outputFile==null)
			this.os = System.out;
		else
			this.os = new FileOutputStream(outputFile);
	}

	private void readAndWrite() throws IOException{
		do{
			int c = this.is.read();
			//this way is only used temporary, it can be used to break the 
			//process when the user pressing "Ctrl^Z";
			if(c == -1)break;
			this.os.write(c);
		}while(true);
	}
	
	private void print() throws IOException{
		int c = -1;
		do{
			c = this.is.read();
			this.os.write(c);
		}while(c > 0);
		
	}
	private void close(InputStream is,OutputStream os){
		if(os!=null){
			try {
				os.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		if(is!=null){
			try {
				is.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
	static String fileSep = System.getProperty("file.separator");
	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		String fileName = "useInput.txt";
		File f = new File("E:"+fileSep+"temp"+fileSep);
		if(!f.exists()){
			f.mkdirs();
		}
		f = new File(f.getAbsolutePath()+fileSep+fileName);
		f.createNewFile();
//		if(true)return;
		ReadAndWrite raw = new ReadAndWrite();
		try {
			raw.init(null, f);
			raw.readAndWrite();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}finally{
			raw.close(raw.is, raw.os);
		}
		//print on Console
		raw.init(f, null);
		try{
			raw.print();
		}finally{
			raw.close(raw.is, raw.os);
		}
		
	}

}

[zhuyouyong]

顶[Quote=引用 4 楼 xiong_hh 的回复:]
Scanner 貌似无法扫描一些特殊的组合键，如果要求不是很严格的话可以考虑以下代码：

Java code

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.……
[/Quote]

[zsw0860]

四楼朋友用是javaBean思想很不错!但视乎跟楼主的要求有点相悖了

[火龙果被占用了]

Runtime.getRuntime().addShutdownHook

[buzaibeishang4617016]

楼上的解决的很彻底啊，顶一下