1.工具类，生成随机验证码字符串
import java.util.Arrays;/**
* 工具类，生成随机验证码字符串
*
* @version 1.0
* @author
*
*/public class SecurityCode {
/**
* 验证码难度级别，Simple只包含数字，Medium包含数字和小写英文，Hard包含数字和大小写英文
*/
public enum SecurityCodeLevel {
Simple, Medium, Hard
}; /**
* 产生默认验证码，4位中等难度
*
* @return String 验证码
*/
public static String getSecurityCode() {
return getSecurityCode(4, SecurityCodeLevel.Medium, false);
} /**
* 产生长度和难度任意的验证码
*
* @param length
* 长度
* @param level
* 难度级别
* @param isCanRepeat
* 是否能够出现重复的字符，如果为true，则可能出现 5578这样包含两个5,如果为false，则不可能出现这种情况
* @return String 验证码
*/
public static String getSecurityCode(int length, SecurityCodeLevel level,
boolean isCanRepeat) { // 随机抽取len个字符
int len = length; // 字符集合(除去易混淆的数字0、数字1、字母l、字母o、字母O)
char[] codes = { '1', '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', 'I', 'J', 'K', 'L', 'M', 'N',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' }; // 根据不同的难度截取字符数组
if (level == SecurityCodeLevel.Simple) {
codes = Arrays.copyOfRange(codes, 0, 9);
} else if (level == SecurityCodeLevel.Medium) {
codes = Arrays.copyOfRange(codes, 0, 33);
} // 字符集合长度
int n = codes.length; // 抛出运行时异常
if (len > n && isCanRepeat == false) {
throw new RuntimeException(String.format(
"调用SecurityCode.getSecurityCode(%1$s,%2$s,%3$s)出现异常，"
+ "当isCanRepeat为%3$s时，传入参数%1$s不能大于%4$s", len,
level, isCanRepeat, n));
} // 存放抽取出来的字符
char[] result = new char[len]; // 判断能否出现重复的字符
if (isCanRepeat) {
for (int i = 0; i < result.length; i++) {
// 索引 0 and n-1
int r = (int) (Math.random() * n); // 将result中的第i个元素设置为codes[r]存放的数值
result[i] = codes[r];
}
} else {
for (int i = 0; i < result.length; i++) {
// 索引 0 and n-1
int r = (int) (Math.random() * n); // 将result中的第i个元素设置为codes[r]存放的数值
result[i] = codes[r];
// 必须确保不会再次抽取到那个字符，因为所有抽取的字符必须不相同。
// 因此，这里用数组中的最后一个字符改写codes[r]，并将n减1
codes[r] = codes[n - 1];
n--;
}
} return String.valueOf(result);
}
public static void main(String[] args) {
SecurityCode code = new SecurityCode();
System.out.println(getSecurityCode(6,SecurityCodeLevel.Hard,false));
}
}
2.
package code;import com.opensymphony.xwork2.ActionSupport;
import java.io.ByteArrayInputStream;
import java.util.Map;
import org.apache.struts2.interceptor.SessionAware;/**
* 提供图片验证码
* @version 1.0 2012/08/22
* @author dongliyang
*/
@SuppressWarnings("serial")
public class SecurityCodeImageAction extends ActionSupport implements SessionAware{ //Struts2中Map类型的session
private Map<String, Object> session; //图片流
private ByteArrayInputStream imageStream; public ByteArrayInputStream getImageStream() {
return imageStream;
} public void setImageStream(ByteArrayInputStream imageStream) {
this.imageStream = imageStream;
} public String execute() throws Exception {
//如果开启Hard模式，可以不区分大小写
// String securityCode = SecurityCode.getSecurityCode(4,SecurityCodeLevel.Hard, false).toLowerCase(); //获取默认难度和长度的验证码
String securityCode = SecurityCode.getSecurityCode();
imageStream = SecurityImage.getImageAsInputStream(securityCode);
//放入session中
session.put("SESSION_SECURITY_CODE", securityCode);
return SUCCESS;
} public void setSession(Map<String, Object> session) {
this.session = session;
}}
3.
package code;import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Random;
import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;/**
* 工具类，生成验证码图片
* @version 1.0 2012/08/21
* @author dongliyang
*
*/
public class SecurityImage { /**
* 生成验证码图片
* @param securityCode 验证码字符
* @return BufferedImage 图片
*/
public static BufferedImage createImage(String securityCode){ //验证码长度
int codeLength=securityCode.length();
//字体大小
int fSize = 15;
int fWidth = fSize + 1;
//图片宽度
int width = codeLength * fWidth + 6 ;
//图片高度
int height = fSize * 2 + 1; //图片
BufferedImage image=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g=image.createGraphics(); //设置背景色
g.setColor(Color.WHITE);
//填充背景
g.fillRect(0, 0, width, height); //设置边框颜色
g.setColor(Color.LIGHT_GRAY);
//边框字体样式
g.setFont(new Font("Arial", Font.BOLD, height - 2));
//绘制边框
g.drawRect(0, 0, width - 1, height -1); //绘制噪点
Random rand = new Random();
//设置噪点颜色
g.setColor(Color.LIGHT_GRAY);
for(int i = 0;i < codeLength * 6;i++){
int x = rand.nextInt(width);
int y = rand.nextInt(height);
//绘制1*1大小的矩形
g.drawRect(x, y, 1, 1);
} //绘制验证码
int codeY = height - 10;
//设置字体颜色和样式
g.setColor(new Color(19,148,246));
g.setFont(new Font("Georgia", Font.BOLD, fSize));
for(int i = 0; i < codeLength;i++){
g.drawString(String.valueOf(securityCode.charAt(i)), i * 16 + 5, codeY);
}
//关闭资源
g.dispose(); return image;
} /**
* 返回验证码图片的流格式
* @param securityCode 验证码
* @return ByteArrayInputStream 图片流
*/
public static ByteArrayInputStream getImageAsInputStream(String securityCode){ BufferedImage image = createImage(securityCode);
return convertImageToStream(image);
} /**
* 将BufferedImage转换成ByteArrayInputStream
* @param image 图片
* @return ByteArrayInputStream 流
*/
private static ByteArrayInputStream convertImageToStream(BufferedImage image){ ByteArrayInputStream inputStream = null;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
JPEGImageEncoder jpeg = JPEGCodec.createJPEGEncoder(bos);
try {
jpeg.encode(image);
byte[] bts = bos.toByteArray();
inputStream = new ByteArrayInputStream(bts);
} catch (ImageFormatException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return inputStream;
}
}
4.
package code;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class CodeAction extends ActionSupport{
HttpServletRequest request = ServletActionContext.getRequest();
HttpSession session=request.getSession();
HttpServletResponse response = ServletActionContext.getResponse();
public String execute(){ try {
response.setContentType("text/html;charset=utf-8");
request.setCharacterEncoding("utf-8");
String validateC = (String) request.getSession().getAttribute("SESSION_SECURITY_CODE");
System.out.println("validateC"+validateC);
String veryCode = request.getParameter("code");
System.out.println("c"+veryCode);
PrintWriter out;
out = response.getWriter();
if(veryCode==null||"".equals(veryCode)){
//response.sendRedirect(refer);
out.print("验证码不能为空");
System.out.println("验证码不能为空");
} else{
if(validateC.equals(veryCode)){ out.print("验证码正确");
//request.getRequestDispatcher("ServletTo").forward(request, response);
System.out.println("验证码正确");
}else{ out.print("验证码错误");
System.out.println("验证码错误");
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
