文件操作

package 文件操作;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Scanner;

public class FileOption {
	String filename = "C:\\Users\\Administrator\\Desktop\\新建文件.txt";
	String inputname;
	int selectnum = 0;
	public FileOption() {
		Scanner scanner = new Scanner(System.in);
		System.out.println("请输入文件地址:");
		inputname = scanner.nextLine();
		
		System.out.println("请输入你的选择:"
				+ "1:创建文件"
				+ "2:删除文件"
				+ "3:读取文件"
				+ "4:写入文件");
		selectnum = scanner.nextInt();
		while(true) {
			
			switch (selectnum) {
			case 1:
				CreateFile(inputname);
				selectnum = scanner.nextInt();
				break;
			case 2:
				DeleteFile(inputname);
				selectnum = scanner.nextInt();
				break;
			case 3:
				ReadFile(inputname);
				selectnum = scanner.nextInt();
				break;	 
			case 4:
				WriteFile(inputname);
				selectnum = scanner.nextInt();
				break;
			default:
				break;
			}
			
		}
		
//		DeleteFile(filename);
//		ReadFile(filename);
	}
	private void CreateFile(String Filename) {
		File file = new File(Filename);	
		try {
			if(!file.exists()) {
				file.createNewFile();
			}
		} catch (IOException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
	
	}
	private void DeleteFile(String DeleteFile) {
		File file = new File(DeleteFile);
		if(file.exists()) {
			file.delete();			
		}
	}
	private String ReadFile(String ReadFile) {
		File file = new File(ReadFile);
		String data = null;
		char buff[] = new char[1024];
		try {
			FileReader fileReader = new FileReader(file);
			fileReader.read(buff);
			data = new String(buff);
			System.out.println("读取到："+data);			
		} catch (IOException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
		return  data;		
	}
	private void WriteFile(String Writedata) {
		
		File file = new File(Writedata);
		try {
			PrintStream ps = new PrintStream(file);
			ps.append("我是新写入的文件内容 ");
		} catch (FileNotFoundException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
		
	}
}

//主函数部分
package 文件操作;

public class Main {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		new FileOption();
	}

}