fileaccesssecuritycheck.java

JAVA网络编程电子书及源码

package net;

import java.io.*;
/**
 * 在这里插入类型说明。
 * 建立日期：(00-8-3 15:52:06)
 * @程序设计者：
 */
public class FileAccessSecurityCheck  extends SecurityManager{
	private String password_for_read;
	private String password_for_write;
/**
 * FileAccessSecurityCheck 构造子注释。
 */
public FileAccessSecurityCheck(String password_for_read,String password_for_write) {
	super();
	this.password_for_read=password_for_read;
	this.password_for_write=password_for_write;
}
/**
 * 在这里插入方法说明。
 * 建立日期：(00-8-3 15:59:10)
 * @return boolean
 */
 public void checkRead(String file)  {
	DataInputStream password_input_stream=new DataInputStream(System.in);
	try{
		System.out.println("password for reading:");
		if (!(password_input_stream.readLine()).equals(password_for_read)){
			throw new SecurityException();
		}
	}catch (IOException e){
		//throw new SecurityException();
		}
	 
}
/**
 * 在这里插入方法说明。
 * 建立日期：(00-8-3 15:59:10)
 * @return boolean
 */
 public void checkWrite(String file){
	DataInputStream password_input_stream=new DataInputStream(System.in);
	try{
		System.out.println("password for writing:");
		if (!(password_input_stream.readLine()).equals(password_for_write)){
			throw new SecurityException();
		}
	}catch (IOException e){
		throw new SecurityException();
		}
	 
}
}