passwordcreator.java

本程序可在局域网内实现聊天、传送文件功能

package org.tuna.util;

public class PasswordCreator
{	
	public static final int DIGIT = 1; /*数字*/
	public static final int ALPHA = 2; /*字母*/
	public static final int PUNCT = 4; /*标点*/
	public static final int OTHER = 8; /*自定*/
	private int    charType;
	private int    pwdLen;
	private char[] digits = "1234567890".toCharArray();
	private char[] alphas = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
	private char[] puncts = "`~!@#$%^&*()-=\\[];',./_+|{}:\"<>?".toCharArray();
	private String others = "";
	private char[] pwdArray;
	
	/**
	 * 默认格式，数字加字母，长度8
	 */
	public PasswordCreator()
	{
		charType = 3;
		pwdLen = 8;
		others = "";
		creatChars();
	}
	
	/**
	 * 以默认格式指定长度构造
	 */
	public PasswordCreator(int len)
	{
		charType = 3;
		pwdLen = len;
		others = "";
		creatChars();
	}
			
	/**
	 * 这里没有指定符号，所以当类型大于7时，自动设为3
	 */
	public PasswordCreator(int type, int len)
	{
		charType = type;
		if (charType >= 8) charType = 3;
		pwdLen = len;
		others = "";
		creatChars();
	}
	
	/**
	 * 自定义字符与标准字符的混合(似乎有些多余)
	 * @param type 类型
	 * @param oth  自定的字符组成的字符串
	 * @param len  长度
	 */
	public PasswordCreator(int type, String oth, int len)
	{
		charType = type;
		others = oth;
		pwdLen = len;
		creatChars();
	}
	
	/**
	 * 字符集为自定义字符
	 * @param cs  自定的字符组成的字符串
	 * @param len 长度
	 */
	public PasswordCreator(String cs, int len)
	{
		charType = 8;
		others = cs;
		pwdLen = len;
		creatChars();
	}
	
	
	// ------ Public Methods ------	
	public String getPassword()
	{		
	  int len = pwdArray.length;
		char[] temp = new char[pwdLen];
		try{
		  for(int i = 0; i < pwdLen; i++)
		     temp[i] = pwdArray[(int)(Math.random() * len)];
		}
		catch(Exception e){System.out.println("length:" + pwdLen + "\n"  + len);}
		return new String(temp);
	}
	
	public void setLength(int len)
	{
		pwdLen = len;
	}
	
	public void setOtherChar(String cs)
	{
		others = cs;
		creatChars();
	}
	
	public void setType(int type)
	{
		charType = type;
		if (charType == 8 && others.length() == 0)
		   others = "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
		creatChars();
	}
	
	
	// ------ Private Methods ------
	private void creatChars()
	{
		String dgt = new String(digits);
		String alp = new String(alphas);
		String pnt = new String(puncts);
		String oth = others;
		switch(charType){
			case 1 : pwdArray = dgt.toCharArray(); break;
			case 2 : pwdArray = alp.toCharArray(); break;
			case 3 : pwdArray = (dgt + alp).toCharArray();  break;
			case 4 : pwdArray = pnt.toCharArray(); break;
			case 5 : pwdArray = (dgt + pnt).toCharArray(); break;
			case 6 : pwdArray = (alp + pnt).toCharArray(); break;
			case 7 : pwdArray = (dgt + alp + pnt).toCharArray(); break;
			case 8 : pwdArray = oth.toCharArray(); break;
			case 9 : pwdArray = (dgt + oth).toCharArray(); break;
			case 10: pwdArray = (alp + oth).toCharArray(); break;
			case 11: pwdArray = (dgt + alp + oth).toCharArray(); break;
			case 12: pwdArray = pnt.toCharArray(); break;
			case 13: pwdArray = (dgt + pnt + oth).toCharArray(); break;
			case 14: pwdArray = (alp + pnt + oth).toCharArray(); break;
			case 15: pwdArray = (dgt + alp + pnt + oth).toCharArray(); break;
			default: return;
		}
	}
	
		
	// ------ For Test ------
	public static void main(String[] args)
	{
		PasswordCreator pc = new PasswordCreator(4, 10);
		for(int i = 0; i < 8; i++){
		   pc.setType(i + 1);
		   pc.setLength(i + 10);
		   pc.setOtherChar("abcde");
		   System.out.println(pc.getPassword());
		}
	}	
}