package com.qkwl.web.front.controller.ValidateImage;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import org.apache.log4j.Logger;
/**
*
* ClassName: VerificationCodeTool <br/>
* Description: creat verification code <br/>
* Date: 2015-3-3 下午08:37:55 <br/>
* <br/>
*
* @author yptian@aliyun.com
*
* first made
* @version 1.0.0<br/>
*
*/
public class VerificationCodeTool {
//LOG
private static final Logger LOG =Logger.getLogger(VerificationCodeTool.class);
//verification code image width
private static final int IMG_WIDTH=146;
//verification code image height
private static final int IMG_HEIGHT=30;
//The number of interference lines
private static final int DISTURB_LINE_SIZE = 15;
//generate a random number
private Random random = new Random();
//result
private int xyresult;
//result random string
private String randomString;
//Chinese Numbers
// private static final String [] CNUMBERS = "零,一,二,三,四,五,六,七,八,九,十".split(",");
//零一二三四五六七八九十乘除加减
//Here, must be java Unicode code
private static final String CVCNUMBERS = "\u96F6\u4E00\u4E8C\u4E09\u56DB\u4E94\u516D\u4E03\u516B\u4E5D\u5341\u4E58\u9664\u52A0\u51CF";
//Definition of drawings in the captcha characters font, font name, font style, font size
//static final font : In Chinese characters garbled
private final Font font = new Font("黑体", Font.BOLD, 18);
//data operator
private static final Map<String, Integer> OPMap = new HashMap<String, Integer>();
static{
OPMap.put("*", 11);
OPMap.put("/", 12);
OPMap.put("+", 13);
OPMap.put("-", 14);
}
/**
* The generation of image verification code
* */
public BufferedImage drawVerificationCodeImage(){
//image
BufferedImage image = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, BufferedImage.TYPE_INT_RGB);
//In memory to create a brush
Graphics g = image.getGraphics();
//Set the brush color
// g.setColor(getRandomColor(200,250));
g.setColor(Color.WHITE);
//Fill the background color, using the current brush colour changing background color images
//The meaning of the four parameters respectively, starting x coordinates, starting y, width, height.
//image background
g.fillRect(0, 0, IMG_WIDTH, IMG_HEIGHT);
//Set the brush color
g.setColor(getRandomColor(200,250));
//image border
g.drawRect(0, 0, IMG_WIDTH-2, IMG_HEIGHT-2);
//Set disturb line color
g.setColor(getRandomColor(110, 133));
//Generate random interference lines
for(int i =0;i < DISTURB_LINE_SIZE; i++){
drawDisturbLine1(g);
drawDisturbLine2(g);
}
//Generate a random number, set return data
getRandomMathString();
//The generated random string used to save the system
StringBuffer logsu = new StringBuffer();
for(int j=0,k = randomString.length(); j < k; j++){
int chid = 0;
if(j==1){
chid = OPMap.get(String.valueOf(randomString.charAt(j)));
}else{
chid = Integer.parseInt(String.valueOf(randomString.charAt(j)));
}
String ch = String.valueOf(CVCNUMBERS.charAt(chid));
logsu.append(ch);
drawRandomString((Graphics2D)g,ch, j, 1f);
//透明图
if(j%2==0) {
drawRandomString((Graphics2D)g,String.valueOf(chid * new Random().nextInt(10) + new Random().nextInt(10)), j, 0.1f);
} else {
drawRandomString((Graphics2D)g,ch, j, 0.1f);
}
}
//= ?
drawRandomString((Graphics2D)g,"\u7B49\u4E8E\uFF1F", 3, 1f);
logsu.append("\u7B49\u4E8E \uFF1F");
LOG.info("汉字验证码 : "+logsu);
randomString = logsu.toString();
//Release the brush object
g.dispose();
return image;
}
/**
* Get a random string
* */
private void getRandomMathString(){
//Randomly generated number 0 to 10
int xx = random.nextInt(10);
int yy = random.nextInt(10);
//save getRandomString
StringBuilder suChinese = new StringBuilder();
//random 0,1,2
int Randomoperands = (int) Math.round(Math.random()*2);
//multiplication
if(Randomoperands ==0){
this.xyresult = yy * xx;
// suChinese.append(CNUMBERS[yy]);
suChinese.append(yy);
suChinese.append("*");
suChinese.append(xx);
//division, divisor cannot be zero, Be divisible
}else if(Randomoperands ==1){
if(!(xx==0) && yy%xx ==0){
this.xyresult = yy/xx;
suChinese.append(yy);
suChinese.append("/");
suChinese.append(xx);
}else{
this.xyresult = yy + xx;
suChinese.append(yy);
suChinese.append("+");
suChinese.append(xx);
}
//subtraction
}else if(Randomoperands ==2){
this.xyresult = yy - xx;
suChinese.append(yy);
suChinese.append("-");
suChinese.append(xx);
//add
}else{
this.xyresult = yy + xx;
suChinese.append(yy);
suChinese.append("+");
suChinese.append(xx);
}
this.randomString = suChinese.toString();
}
/**
* Draw a random string
* @param g Graphics
* @param randomString random string
* @param i the random number of characters
* */
public void drawRandomString(Graphics2D g,String randomvcch,int i, float alpha){
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
//Set the string font style
g.setFont(font);
//Set the color string
int rc = random.nextInt(255);
int gc = random.nextInt(255);
int bc = random.nextInt(255);
g.setColor(new Color(rc, gc, bc));
//random string
//Set picture in the picture of the text on the x, y coordinates, random offset value
int x = random.nextInt(3);
int y = random.nextInt(2);
g.translate(x, y);
//Set the font rotation angle
int degree = new Random().nextInt() % 15;
//Positive point of view
g.rotate(degree * Math.PI / 180, 5+i*25, 20);
//Character spacing is set to 15 px
//Using the graphics context of the current font and color rendering by the specified string for a given text.
//The most on the left side of the baseline of the characters in the coordinate system of the graphics context (x, y) location
//str- to draw string.x - x coordinate.y - y coordinate.
g.drawString(randomvcch, 5+i*25, 20);
//Reverse Angle
g.rotate(-degree * Math.PI / 180, 5+i*25, 20);
}
/**
*Draw line interference
*@param g Graphics
* */
public void drawDisturbLine1(Graphics g){
int x1 = random.nextInt(IMG_WIDTH);
int y1 = random.nextInt(IMG_HEIGHT);
int x2 = random.nextInt(13);
int y2 = random.nextInt(15);
//x1 - The first point of the x coordinate.
//y1 - The first point of the y coordinate
//x2 - The second point of the x coordinate.
//y2 - The second point of the y coordinate.
//X1 and x2 is the starting point coordinates, x2 and y2 is end coordinates.
g.drawLine(x1, y1, x1 + x2, y1 + y2);
}
/**
*Draw line interference
*@param g Graphics
* */
public void drawDisturbLine2(Graphics g){
int x1 = random.nextInt(IMG_WIDTH);
int y1 = random.nextInt(IMG_HEIGHT);
int x2 = random.nextInt(13);
int y2 = random.nextInt(15);
//x1 - The first point of the x coordinate.
//y1 - The first point of the y coordinate
//x2 - The second point of the x coordinate.
//y2 - The second point of the y coordinate.
//X1 and x2 is the starting point coordinates, x2 and y2 is end coordinates.
g.drawLine(x1, y1, x1 - x2, y1 - y2);
}
/**
* For random color
* @param fc fc
* @param bc bc
* @return color random color
* */
public Color getRandomColor(int fc,int bc){
if(fc > 255){
fc = 255;
}
if(bc > 255){
bc = 255;
}
//Generate random RGB trichromatic
int r = fc+random.nextInt(bc -fc - 16);
int g = fc+random.nextInt(bc - fc - 14);
int b = fc+random.nextInt(bc - fc - 18);
return new Color(r, g, b);
}
/**
* xyresult.<br/>
*
* @return the xyresult <br/>
*
*/
public int getXyresult() {
return xyresult;
}
/**
* randomString.<br/>
*
* @return the randomString <br/>
*
*/
public String getRandomString() {
return randomString;
}
}
package com.qkwl.web.front.controller.ValidateImage;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.qkwl.web.front.controller.base.RedisBaseControll;
@Controller
public class ValidateImageController extends RedisBaseControll{
//LOG
private static final Logger LOG =Logger.getLogger(ValidateImageController.class);
//@RequestMapping("/servlet/ValidateImageServlet")
public void getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {
response.setDateHeader("Expires", 0);
response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
response.addHeader("Cache-Control", "post-check=0, pre-check=0");
response.setHeader("Pragma", "no-cache");
response.setContentType("image/jpeg");
String verifyCode = VerifyCodeUtils.generateVerifyCode(4);
super.deletRedisData("CHECKCODE");
super.setRedisData("CHECKCODE",verifyCode);
// 生成图片
int w = 100, h = 39;
VerifyCodeUtils.outputImage(w, h, response.getOutputStream(), verifyCode);
response.getOutputStream().flush();
}
@RequestMapping("/servlet/ValidateImageServlet")
public void verificationcode(HttpServletRequest request, HttpServletResponse response) throws Exception{
response.setDateHeader("Expires", 0);
response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
response.addHeader("Cache-Control", "post-check=0, pre-check=0");
response.setHeader("Pragma", "no-cache");
response.setContentType("image/jpeg");
//Verification code tool
VerificationCodeTool vcTool = new VerificationCodeTool();
BufferedImage image = vcTool.drawVerificationCodeImage();
//Verification code result
int vcResult = vcTool.getXyresult();
String vcValue = vcTool.getRandomString();
LOG.info("验证码 : "+vcResult+" 验证码结果 : "+vcValue);
super.deletRedisData("CHECKCODE");
super.setRedisData("CHECKCODE",vcResult);
ImageIO.write(image, "JPEG", response.getOutputStream());
}
}
