?? makecertpic.java
字號:
package util;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
/**
* 生成驗證碼圖片
*/
public class makeCertPic {
//驗證碼圖片中可以出現(xiàn)的字符集,可根據(jù)需要修改
private char mapTable[]={
'a','b','c','d','e','f',
'g','h','i','j','k','l',
'm','n','o','p','q','r',
's','t','u','v','w','x',
'y','z','0','1','2','3',
'4','5','6','7','8','9'};
/**
* 功能:生成彩色驗證碼圖片
* 參數(shù)width為生成的圖片的寬度,參數(shù)height為生成的圖片的高度,參數(shù)os為頁面的輸出流
*/
public String getCertPic(int width, int height, OutputStream os) {
if(width<=0)width=60;
if(height<=0)height=20;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 獲取圖形上下文
Graphics g = image.getGraphics();
// 設(shè)定背景色
g.setColor(new Color(0xDCDCDC));
g.fillRect(0, 0, width, height);
//畫邊框
g.setColor(Color.black);
g.drawRect(0,0,width-1,height-1);
// 取隨機(jī)產(chǎn)生的認(rèn)證碼
String strEnsure = "";
// 4代表4位驗證碼,如果要生成更多位的認(rèn)證碼,則加大數(shù)值
for(int i=0; i<4; ++i) {
strEnsure += mapTable[(int)(mapTable.length*Math.random())];
}
// 將認(rèn)證碼顯示到圖象中,如果要生成更多位的認(rèn)證碼,增加drawString語句
g.setColor(Color.black);
g.setFont(new Font("Atlantic Inline",Font.PLAIN,18));
String str = strEnsure.substring(0,1);
g.drawString(str,8,17);
str = strEnsure.substring(1,2);
g.drawString(str,20,15);
str = strEnsure.substring(2,3);
g.drawString(str,35,18);
str = strEnsure.substring(3,4);
g.drawString(str,45,15);
// 隨機(jī)產(chǎn)生10個干擾點(diǎn)
Random rand = new Random();
for (int i=0;i<10;i++) {
int x = rand.nextInt(width);
int y = rand.nextInt(height);
g.drawOval(x,y,1,1);
}
// 釋放圖形上下文
g.dispose();
try {
// 輸出圖象到頁面
ImageIO.write(image, "JPEG", os);
} catch (IOException e) {
return "";
}
return strEnsure;
}
}
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