有一个struts项目,有个登录验证码,不知道该怎么做。请高手指教。谢谢!
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然后配置一个action,action可以直接返回success就可以了,转到这个result来处理,result的代码如下:package result;import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.util.Random;import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext;
import org.apache.struts2.dispatcher.StrutsResultSupport;
import com.opensymphony.xwork2.ActionInvocation;public class ValidateImageResult extends StrutsResultSupport {
private static final long serialVersionUID = 7379417931095303791L;
private static final int WIDTH = 85;
private static final int HEIGHT = 22;
private static final int CHARCOUNT = 4;
Random random = new Random();
private static final char[] CHARLIB = { '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', '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', '1', '2', '3', '4', '5', '6', '7',
'8', '9', '0' }; @Override
protected void doExecute(String arg0, ActionInvocation arg1)
throws Exception {
HttpServletResponse response = ServletActionContext.getResponse();
HttpServletRequest request = ServletActionContext.getRequest();
response.setContentType("image/png");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
String randomchar = getRandomChar();
HttpSession session = request.getSession();
session.setAttribute("vcode", randomchar);
BufferedImage image = null;
try {
image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
Graphics2D g = (Graphics2D) image.getGraphics();
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g.setColor(Color.WHITE);
g.fillRect(0, 0, WIDTH, HEIGHT);
g.setFont(new Font("Arial Black", 0, 15));
for (int i = 0; i < randomchar.length(); i++) {
String temp = "" + randomchar.charAt(i);
g.setColor(getRandomColor());
g.drawString(temp, 21 * i + getRandomX(), 16 + getRandomY());
}
g.dispose();
} catch (Exception e) {
e.printStackTrace();
}
try {
ImageIO.write(image, "PNG", response.getOutputStream());
} catch (Exception e) {
e.printStackTrace();
} } public int getRandomX() {
return random.nextInt(8);
} public int getRandomY() {
return random.nextInt(6) - 3;
} public Color getRandomColor() {
int r, g, b;
int temp = random.nextInt(3);
switch (temp) {
case 0:
r = 128;
g = random.nextInt(255);
b = random.nextInt(255);
break;
case 1:
g = 128;
r = random.nextInt(255);
b = random.nextInt(255);
break;
case 2:
b = 128;
g = random.nextInt(255);
r = random.nextInt(255);
break;
default:
r = 128;
g = random.nextInt(255);
b = random.nextInt(255);
break;
}
return new Color(r, g, b);
} public String getRandomChar() {
String result = "";
Random random = new Random();
while (result.length() < CHARCOUNT) {
char c = CHARLIB[random.nextInt(CHARLIB.length)];
result = result + c;
}
return result;
}}
2:把该字符串放入session中备用。
3:生成该字符串的验证码图片文件,显示在页面上。
4:与用户输入的字符串和session中的那个相比较 over。import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.util.Random;import javax.imageio.ImageIO;public class ValidateCode {
// 验证码图片的宽度。
private int width = 60;
// 验证码图片的高度。
private int height = 20;
// 验证码字符个数
private int codeCount = 4; private int x = 0;
// 字体高度
private int fontHeight;
private int codeY; // 生成验证字符串
private String CreateCheckCodeString() {
// 定义用于验证符的字符数组
char[] allCharArray = { '0', '1', '2', '3', '4', '5', '6', '7', '8',
'9', 'A', 'S', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K',
'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
'X', 'Y', 'Z' };
// 定义验证字符串
String randomCode = "";
Random rand = new Random();
for (int i = 0; i < 4; i++) {
randomCode += allCharArray[rand.nextInt(allCharArray.length)];
}
return randomCode;
} /**
*
* @param validatecode
* 验证码字符串
* @param filepath
* 生成的图片存放路径
*/
public void createValidateCode(String filepath) {
// 定义图像buffer
BufferedImage buffImg = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 定义画笔 获取图形上下文
Graphics2D g = buffImg.createGraphics();
// 设定背景色
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height); // //创建字体,字体的大小应该根据图片的高度来定。
// Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);
// //设置字体。
// g.setFont(font);
// 画边框
g.setColor(Color.blue);
g.drawRect(0, 0, width - 1, height - 1); // 创建一个随机数生成器类
Random random = new Random(); // 随机产生5条干扰线,使图象中的认证码不易被其它程序探测到。
g.setColor(Color.BLACK);
for (int i = 0; i < 5; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
g.drawLine(x, y, x + xl, y + yl);
} // 将认证码显示到图象中
String validatecode = CreateCheckCodeString();
g.setColor(Color.black);
for (int i = 0; i < codeCount; i++) {
g.drawString(validatecode, (i + 1) * x, codeY);
} // 定义输出流
FileOutputStream fos_jpg = null;
try {
fos_jpg = new FileOutputStream("c:\\validate.jpg");
// 生成文件
ImageIO.write(buffImg, "JPEG", fos_jpg);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} }
}这个代码那你可以改造成bs结构的,直接输出到页面也可以。记得把生成验证码保存在session理就可以了。