validate.java

选排课系统功能的设计上

package com.util;

import java.io.UnsupportedEncodingException;


public class Validate {
	
	/**
	 * 是否为数字和英文验证
	 *
	 */
	public int getIntAndChar(String str){
		char c;
		int i;
		for (i = 0; i<str.length(); i++){
			c = str.charAt(i);
			if(!((c>='0' && c<='9') || (c>='a' && c<='z') || (c>='A' && c<='Z'))){
				break;
			}
		}//判断字符是否在某个区间
		if(i < str.length()){
			return -1;
		}else{
			return 0;
		}
	}
	
	/**
	 * 是否为整数验证
	 *
	 */
	public int getInt(String str){
		char c;
		int i;
		for (i = 0; i<str.length(); i++){
			c = str.charAt(i);
			if(!(c>='0' && c<='9')){
				break;
			}
		}//判断字符是否在某个区间
		if(i < str.length()){
			return -1;
		}else{
			return 0;
		}
	}
	
	/**
	 * 是否为非法字符验证
	 *
	 */
	public boolean getLawlessChar(String str){
		boolean flag = false;
		char c;
		for(int i = 0;i < str.length();i++){
			c = str.charAt(i);
			switch(c){
			case '<' : flag = true; break;
			case '>' : flag = true; break;
			case '"' : flag = true; break;
			case '&' : flag = true; break;
			case ' ' : flag = true; break;
			}
		}
		return flag;
	}
	
	/**
	 * 中文转换
	 * 将gb2312编码转换成unicode编码
	 */
	public String getUnicode(String str) {
		try {
			return new String(str.getBytes("iso8859_1"),"gb2312");
		} catch (UnsupportedEncodingException e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
			return str;
		}
	}
	
	/**
	 * 中文转换
	 * 将unicode编码转换成gb2312编码
	 */
	public String getGb2312(String str) {
		try {
			return new String(str.getBytes("gb2312"),"iso8859_1");
		} catch (UnsupportedEncodingException e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
			return str;
		}
	}
	
	/**
	 * 计算星期
	 * 计算某年某月某日是星期几
	 */
	public int getWeek(int year,int month,int day){
		int sum = 0;
		int j = 0;
		boolean b = false;
		for(int i = 0;i < year;i++)
		{
			if((i%4==0 && i%100!=0)||(i%400==0 && i!=0))
			{
				j++;
			}
		}
		
		if((year%4==0 && year%100!=0)||(year%400==0 && year!=0)){
			b = true;
		}
		
		sum = 365*year+j;
		
		switch (month) {
		case 1: sum = sum+day;break;
		case 2: sum = sum+31+day;break;
		case 3: sum = sum+28+31+day;break;
		case 4: sum = sum+31+28+31+day;break;
		case 5: sum = sum+30+31+28+31+day;break;
		case 6: sum = sum+31+30+31+28+31+day;break;
		case 7: sum = sum+30+31+30+31+28+31+day;break;
		case 8: sum = sum+31+30+31+30+31+28+31+day;break;
		case 9: sum = sum+31+31+30+31+30+31+28+31+day;break;
		case 10: sum = sum+30+31+31+30+31+30+31+28+31+day;break;
		case 11: sum = sum+31+30+31+31+30+31+30+31+28+31+day;break;
		case 12: sum = sum+30+31+30+31+31+30+31+30+31+28+31+day;break;
		}
		
		if(b == true && month > 2){
			sum = sum+1;
		}
		return (sum-1)%7;
	}

}