java6位驗證碼

Ⅰ 用java怎麼製作驗證碼

原理:

1.隨機生成4個數字 用到了Random類
2.對這4個數字設置字體格式 用 setFont方法
3.改變字體顏色用setColor 然後隨機生成顏色

代碼如下
package s1;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.jms.Session;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class GetImage extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

this.doPost(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 發送圖片不能夠添加這2行代碼
// response.setContentType("text/html;charset=UTF-8");
// request.setCharacterEncoding("UTF-8");

int width=100;
int height=50;
//獲得一張圖片
BufferedImage image=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics g=image.getGraphics();
g.setColor(Color.WHITE);
g.fillRect(1, 1, width-2, height-2);
g.setFont(new Font("宋體",Font.BOLD,30));
Random random=new Random();

/虛枯兄/ 填充的字元串
String str="";

//緩存生成的驗證碼敗橘
StringBuffer stringbuffer=new StringBuffer();

//隨機生成驗證碼的顏差襲色和字元
for(int i=0;i<4;i++)
{ //設置隨機顏色
g.setColor(new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256)));

int index=random.nextInt(62);//這里的62就是從填充字元段中隨意選取一個位置
String str1=str.substring(index,index+1);
g.drawString(str1, 20*i, 30);//x,y數值設置太小會顯示不出來
stringbuffer.append(str1);
}

//將生成的驗證碼存到伺服器
request.getSession().setAttribute("checkcode", stringbuffer.toString());//key和value

//將圖片發送給瀏覽器
ImageIO.write(image, "jpg", response.getOutputStream());

}

}

用戶登錄界面代碼
package s1;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class Login extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html;charset=UTF-8");// 設置伺服器發送給瀏覽器的編碼方式
request.setCharacterEncoding("UTF-8"); // 客戶端向伺服器提交的數據的解碼方式
// 獲得用戶提交的數據
String checkcode = request.getParameter("checkcode");
System.out.println(checkcode);

// 判斷輸入的驗證碼是不是符合
HttpSession session = request.getSession();// session是存放數據的地方
String str = (String) session.getAttribute("checkcode");

if (str != null) {
if (checkcode.compareToIgnoreCase(str) == 0) // 驗證碼忽略大小寫
response.getWriter().println("驗證碼輸入正確");

else
response.getWriter().println("驗證碼輸入錯誤");
}

else response.getWriter().println("驗證碼失效");

// 使用完的驗證碼信息要刪除,返回原頁面再輸一次,驗證碼就失效了
session.removeAttribute("checkcode");

}

}

Ⅱ java中如何編寫輸出一組由大寫和數字組成的6個隨機驗證碼,字母O和I不能輸出

importjava.util.Random;

publicclassTest{
	publicstaticvoidmain(String[]args){
		charc='i';
		StringBuffersb=newStringBuffer();
		for(inti=0;i<6;i++){
			inta=Math.abs((newRandom()).nextInt(57));//產生0~57的隨機數
			if(a<=9){//將0~9轉為char的0~9
				sb.append((char)(a+48));
			}elseif(a<33){//將10~33轉為char的A~Z
				if((a+55)==79||(a+55)==73){
					sb.append((char)(a+63));
				}else{
					sb.append((char)(a+55));
				}
			}else{//將33~57轉為char的a~z
				sb.append((char)(a+63));
			}
		}
		System.out.println("隨機生成的6位密碼為:"+sb.toString());
	}
}

Ⅲ java如何隨機生成6位數的驗證碼

public static final char[] chars={'1','2','3','4','5','6','7','8','9','0','Q','W','E','R','T','Y','U','I','O',
'P','A','S','D','F','G','H','J','K','L','Z','X','C','V','B','N','M'};
public static Random random=new Random();
public static String getRandomString(){
StringBuffer sb=new StringBuffer();
for(int i=0;i<=5;i++){
sb.append(chars[random.nextInt(chars.length)]);;
}
return sb.toString();
}

Ⅳ 用java生成6位驗證碼，由大小寫數字組成，不能重復字元

生成隨機可以用Random類，不能重復可以考慮放在HashSet中，因為HashSet的值是不能重復的，看代碼如下：

{
	publicstaticvoidmain(String[]args){
		
	Set<String>store=getletterandnum(6);
	
	printSet(store);
			
	}

	publicstaticSet<String>getletterandnum(intlength){
		
		Set<String>set=newHashSet<String>();

		for(inti=0;i<length;i++){

			Stringvalue=getrandom();
			
			set.add(value);
		}
		
		if(set.size()<length){//如果沒有生成6位
			
			Stringvalue=getrandom();//繼續調用生成隨機數的方法
			
			set.add(value);
			
		}
		
		returnset;
	}

	privatestaticStringgetrandom(){//生成隨機字母和數字方法
		
		Stringvalue="";

		Randomrandom=newRandom();
		
		intgen=random.nextInt(2);//0、1、2

		Stringcharornum=gen%2==0?"char":"num";

		if("char".equals(charornum)){

			inttemp=random.nextInt(2)%2==0?65:97;

			intascii=random.nextInt(26);
			
			value+=(char)(ascii+temp);

		}elseif("num".equalsIgnoreCase(charornum)){

			value+=String.valueOf(random.nextInt(10));
		}
		returnvalue;
	}

	publicstaticvoidprintSet(Setset){//列印set的方法
		
	Iteratoriterator=set.iterator();
	while(iterator.hasNext()){
		Stringele=(String)iterator.next();
		System.out.print(ele+"");
		
	}
		
	}