jsp登入驗證碼功能實現
阿新 • • 發佈：2019-02-02
package com.coffee.action;
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;
import javax.imageio.ImageIO;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
/**
* 驗證碼程式
* @author wang
*
*/
public class CheckImgAction extends ActionSupport {
@Override
public String execute() throws Exception {
int width = 120;
int height = 30;
BufferedImage bufferedImage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics graphics = bufferedImage.getGraphics();
graphics.setColor(getRandColor(200, 250));
graphics.fillRect(0, 0, width, height);
graphics.setColor(Color.WHITE);
graphics.drawRect(0, 0, width - 1, height - 1);
Graphics2D graphics2d = (Graphics2D) graphics;
graphics2d.setFont(new Font("宋體", Font.BOLD, 18));
String words = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
Random random = new Random();
StringBuffer sb = new StringBuffer();
int x = 10;
for (int i = 0; i < 4; i++) {
graphics2d.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));
int jiaodu = random.nextInt(60) - 30;
double theta = jiaodu * Math.PI / 180;
int index = random.nextInt(words.length());
char c = words.charAt(index);
sb.append(c);
graphics2d.rotate(theta, x, 20);
graphics2d.drawString(String.valueOf(c), x, 20);
graphics2d.rotate(-theta, x, 20);
x += 30;
}
//將色很成的驗證碼號碼放到session,以便獲取驗證對比
ServletActionContext.getRequest().getSession()
.setAttribute("checkcode", sb.toString());
// 干擾線
graphics.setColor(getRandColor(160, 200));
int x1;
int x2;
int y1;
int y2;
for (int i = 0; i < 30; i++) {
x1 = random.nextInt(width);
x2 = random.nextInt(12);
y1 = random.nextInt(height);
y2 = random.nextInt(12);
graphics.drawLine(x1, y1, x1 + x2, x2 + y2);
}
// 圖片輸出到瀏覽器
graphics.dispose();
ImageIO.write(bufferedImage, "jpg", ServletActionContext.getResponse()
.getOutputStream());
return NONE;
}
/**
* 獲取隨機顏色
*/
private Color getRandColor(int fc, int bc) {
Random random = new Random();
if (fc > 255) {
fc = 255;
}
if (bc > 255) {
bc = 255;
}
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
}
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;
import javax.imageio.ImageIO;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
/**
* 驗證碼程式
* @author wang
*
*/
public class CheckImgAction extends ActionSupport {
@Override
public String execute() throws Exception {
int width = 120;
int height = 30;
BufferedImage bufferedImage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics graphics = bufferedImage.getGraphics();
graphics.setColor(getRandColor(200, 250));
graphics.fillRect(0, 0, width, height);
graphics.setColor(Color.WHITE);
graphics.drawRect(0, 0, width - 1, height - 1);
Graphics2D graphics2d = (Graphics2D) graphics;
graphics2d.setFont(new Font("宋體", Font.BOLD, 18));
String words = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
Random random = new Random();
StringBuffer sb = new StringBuffer();
int x = 10;
for (int i = 0; i < 4; i++) {
graphics2d.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));
int jiaodu = random.nextInt(60) - 30;
double theta = jiaodu * Math.PI / 180;
int index = random.nextInt(words.length());
char c = words.charAt(index);
sb.append(c);
graphics2d.rotate(theta, x, 20);
graphics2d.drawString(String.valueOf(c), x, 20);
graphics2d.rotate(-theta, x, 20);
x += 30;
}
//將色很成的驗證碼號碼放到session,以便獲取驗證對比
ServletActionContext.getRequest().getSession()
.setAttribute("checkcode", sb.toString());
// 干擾線
graphics.setColor(getRandColor(160, 200));
int x1;
int x2;
int y1;
int y2;
for (int i = 0; i < 30; i++) {
x1 = random.nextInt(width);
x2 = random.nextInt(12);
y1 = random.nextInt(height);
y2 = random.nextInt(12);
graphics.drawLine(x1, y1, x1 + x2, x2 + y2);
}
// 圖片輸出到瀏覽器
graphics.dispose();
ImageIO.write(bufferedImage, "jpg", ServletActionContext.getResponse()
.getOutputStream());
return NONE;
}
/**
* 獲取隨機顏色
*/
private Color getRandColor(int fc, int bc) {
Random random = new Random();
if (fc > 255) {
fc = 255;
}
if (bc > 255) {
bc = 255;
}
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
}