工具类
package com.util;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.Random;
/**
* 验证码生成器
*
* @author llq
*/
public class CpachaUtil {
/**
* 验证码来源
*/
final private char[] code = {
'2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F',
'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R',
'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
};
/**
* 字体
*/
final private String[] fontNames = new String[]{
"黑体", "宋体", "Courier", "Arial",
"Verdana", "Times", "Tahoma", "Georgia"};
/**
* 字体样式
*/
final private int[] fontStyles = new int[]{
Font.BOLD, Font.ITALIC|Font.BOLD
};
/**
* 验证码长度
* 默认4个字符
*/
private int vcodeLen = 4;
/**
* 验证码图片字体大小
* 默认17
*/
private int fontsize = 21;
/**
* 验证码图片宽度
*/
private int width = (fontsize+1)*vcodeLen+10;
/**
* 验证码图片高度
*/
private int height = fontsize+12;
/**
* 干扰线条数
* 默认3条
*/
private int disturbline = 3;
public CpachaUtil(){}
/**
* 指定验证码长度
* @param vcodeLen 验证码长度
*/
public CpachaUtil(int vcodeLen) {
this.vcodeLen = vcodeLen;
this.width = (fontsize+1)*vcodeLen+10;
}
/**
* 指定验证码长度、图片宽度、高度
* @param vcodeLen
* @param width
* @param height
*/
public CpachaUtil(int vcodeLen,int width,int height) {
this.vcodeLen = vcodeLen;
this.width = width;
this.height = height;
}
/**
* 生成验证码图片
* @param vcode 要画的验证码
* @param drawline 是否画干扰线
* @return
*/
public BufferedImage generatorVCodeImage(String vcode, boolean drawline){
//创建验证码图片
BufferedImage vcodeImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = vcodeImage.getGraphics();
//填充背景色
g.setColor(new Color(246, 240, 250));
g.fillRect(0, 0, width, height);
if(drawline){
drawDisturbLine(g);
}
//用于生成伪随机数
Random ran = new Random();
//在图片上画验证码
for(int i = 0;i < vcode.length();i++){
//设置字体
g.setFont(new Font(fontNames[ran.nextInt(fontNames.length)], fontStyles[ran.nextInt(fontStyles.length)], fontsize));
//随机生成颜色
g.setColor(getRandomColor());
//画验证码
g.drawString(vcode.charAt(i)+"", i*fontsize+10, fontsize+5);
}
//释放此图形的上下文以及它使用的所有系统资源
g.dispose();
return vcodeImage;
}
/**
* 获得旋转字体的验证码图片
* @param vcode
* @param drawline 是否画干扰线
* @return
*/
public BufferedImage generatorRotateVCodeImage(String vcode, boolean drawline){
//创建验证码图片
BufferedImage rotateVcodeImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = rotateVcodeImage.createGraphics();
//填充背景色
g2d.setColor(new Color(246, 240, 250));
g2d.fillRect(0, 0, width, height);
if(drawline){
drawDisturbLine(g2d);
}
//在图片上画验证码
for(int i = 0;i < vcode.length();i++){
BufferedImage rotateImage = getRotateImage(vcode.charAt(i));
g2d.drawImage(rotateImage, null, (int) (this.height * 0.7) * i, 0);
}
g2d.dispose();
return rotateVcodeImage;
}
/**
* 生成验证码
* @return 验证码
*/
public String generatorVCode(){
int len = code.length;
Random ran = new Random();
StringBuffer sb = new StringBuffer();
for(int i = 0;i < vcodeLen;i++){
int index = ran.nextInt(len);
sb.append(code[index]);
}
return sb.toString();
}
/**
* 为验证码图片画一些干扰线
* @param g
*/
private void drawDisturbLine(Graphics g){
Random ran = new Random();
for(int i = 0;i < disturbline;i++){
int x1 = ran.nextInt(width);
int y1 = ran.nextInt(height);
int x2 = ran.nextInt(width);
int y2 = ran.nextInt(height);
g.setColor(getRandomColor());
//画干扰线
g.drawLine(x1, y1, x2, y2);
}
}
/**
* 获取一张旋转的图片
* @param c 要画的字符
* @return
*/
private BufferedImage getRotateImage(char c){
BufferedImage rotateImage = new BufferedImage(height, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = rotateImage.createGraphics();
//设置透明度为0
g2d.setColor(new Color(255, 255, 255, 0));
g2d.fillRect(0, 0, height, height);
Random ran = new Random();
g2d.setFont(new Font(fontNames[ran.nextInt(fontNames.length)], fontStyles[ran.nextInt(fontStyles.length)], fontsize));
g2d.setColor(getRandomColor());
double theta = getTheta();
//旋转图片
g2d.rotate(theta, height/2, height/2);
g2d.drawString(Character.toString(c), (height-fontsize)/2, fontsize+5);
g2d.dispose();
return rotateImage;
}
/**
* @return 返回一个随机颜色
*/
private Color getRandomColor(){
Random ran = new Random();
return new Color(ran.nextInt(220), ran.nextInt(220), ran.nextInt(220));
}
/**
* @return 角度
*/
private double getTheta(){
return ((int) (Math.random()*1000) % 2 == 0 ? -1 : 1)*Math.random();
}
/**
* @return 验证码字符个数
*/
public int getVcodeLen() {
return vcodeLen;
}
/**
* 设置验证码字符个数
* @param vcodeLen
*/
public void setVcodeLen(int vcodeLen) {
this.width = (fontsize+3)*vcodeLen+10;
this.vcodeLen = vcodeLen;
}
/**
* @return 字体大小
*/
public int getFontsize() {
return fontsize;
}
/**
* 设置字体大小
* @param fontsize
*/
public void setFontsize(int fontsize) {
this.width = (fontsize+3)*vcodeLen+10;
this.height = fontsize+15;
this.fontsize = fontsize;
}
/**
* @return 图片宽度
*/
public int getWidth() {
return width;
}
/**
* 设置图片宽度
* @param width
*/
public void setWidth(int width) {
this.width = width;
}
/**
* @return 图片高度
*/
public int getHeight() {
return height;
}
/**
* 设置图片高度
* @param height
*/
public void setHeight(int height) {
this.height = height;
}
/**
* @return 干扰线条数
*/
public int getDisturbline() {
return disturbline;
}
/**
* 设置干扰线条数
* @param disturbline
*/
public void setDisturbline(int disturbline) {
this.disturbline = disturbline;
}
}
controller中代码
/**
* 验证码
*/
@RequestMapping(value="/get_cpacha",method = RequestMethod.GET)
public void getCpacha(HttpServletRequest request,
@RequestParam(value="v1",defaultValue="5",required=false) Integer v1,
@RequestParam(value="w",defaultValue="150",required=false) Integer w,
@RequestParam(value="h",defaultValue="40",required=false) Integer h,
HttpServletResponse response){
//System.out.println("获取验证码");
CpachaUtil cpachaUtil = new CpachaUtil(v1,w,h);
String generatorVCode = cpachaUtil.generatorVCode();
request.getSession().setAttribute("loginCpacha", generatorVCode);
BufferedImage generatorRotateVCodeImage = cpachaUtil.generatorRotateVCodeImage(generatorVCode, true);
try {
ImageIO.write(generatorRotateVCodeImage, "gif", response.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
其中
可以对controller中代码进行修改,圈中部分,可以改生成个数vl,宽度w,高度h,记住,这里修改,记得jsp页面也要修改,保持它们一致
jsp代码
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
验证码:<input type="text" name="vCode">
<img style="height: 40px;" id="codeImg"
onclick="this.src='system/get_cpacha?vl=5$w=150&h=40'+Math.random()"
alt="点击更换" title="点击更换" src="system/get_cpacha" />
</body>
</html>