java web编程中 struts2+hibernate 实现B2C电子商务网站的登录 、注册中验证码的实现（源码精简版）

下边只在注册中实现

1、首先是在Action中写出生成验证码所需的方法（下边是在MemberAction.java中写）

package www.csdn.dbshop.action;

import org.apache.struts2.ServletActionContext;
import www.csdn.dbshop.domain.Admin;
import www.csdn.dbshop.domain.Member;
import www.csdn.dbshop.service.BaseService;
import www.csdn.dbshop.service.MemberService;
import www.csdn.dbshop.service.impl.BaseServiceImpl;
import www.csdn.dbshop.service.impl.MemberServiceImpl;
import www.csdn.dbshop.util.Pagination;
import www.csdn.dbshop.util.StringUtil;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class MemberAction extends BaseAction{
private BaseService baseService = new BaseServiceImpl();
private MemberService memberService = new MemberServiceImpl();
private String cuemail;
private boolean cueflag;
private Member member;
private String acodet;
private boolean cacodet;
private String sRand = "";
private String acode;

public void setAcode(String acode) {
this.acode = acode;
}

public boolean isCacodet() {
return cacodet;
}

public void setAcodet(String acodet) {
this.acodet = acodet;
}

public void setMember(Member member) {
this.member = member;
}

public Member getMember() {
return member;
}

public boolean isCueflag() {
return cueflag;
}

public void setCacodet(boolean cacodet) {
this.cacodet = cacodet;
}

public void setCuemail(String cuemail) {
this.cuemail = cuemail;
}

public String checkuemail() {
cueflag = baseService.checkProperty(Member.class, "email", cuemail,null);
return "cuemail";
}

public void setCueflag(boolean cueflag) {
this.cueflag = cueflag;
}

public String register() {
if (((String) ServletActionContext.getRequest().getSession().getAttribute("checkcode")).equalsIgnoreCase(acode)) {
Member user = new Member();
user.setEmail(member.getEmail());
user.setPass(member.getPass());
boolean sflag = baseService.saveObject(user);
if (sflag) {
return "register";
} else {
return "registererror";
}
} else {
ServletActionContext.getRequest().setAttribute("register","acerror");
return "registererror";
}
}

public String login() {
if (((String) ServletActionContext.getRequest().getSession().getAttribute("checkcode")).equalsIgnoreCase(acode)) {
Member user = memberService.login(member.getEmail(),member.getPass());
if (user == null) {
ServletActionContext.getRequest().setAttribute("login", "error");
return "loginerror";
} else {
ServletActionContext.getRequest().getSession().setAttribute("user", user);
return "login";
}
} else {
ServletActionContext.getRequest().getSession().setAttribute("login", "acerror");
return "loginerror";
}

}

public String checkAcodet() {
if (((String) ServletActionContext.getRequest().getSession().getAttribute("checkcode")).equalsIgnoreCase(acodet)) {
cacodet = true;
} else {
cacodet = false;
}
return "checkacode";
}

/**
******************** Action生成验证码* ******************
*/
private Font imgFont = new Font("Times New Roman", Font.BOLD, 17);

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);

}

public void checkCodeImage() {
HttpServletRequest request = ServletActionContext.getRequest();
HttpServletResponse response = ServletActionContext.getResponse();
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("image/jpeg");
int width = 75, height = 20;
BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
Random random = new Random();
g.setColor(getRandColor(200, 250));
g.fillRect(1, 1, width - 1, height - 1);
g.setColor(new Color(102, 102, 102));
g.drawRect(0, 0, width - 1, height - 1);
g.setFont(imgFont);
g.setColor(getRandColor(160, 200));
for (int i = 0; i < 155; i++) {
int x = random.nextInt(width - 1);
int y = random.nextInt(height - 1);
int xl = random.nextInt(6) + 1;
int yl = random.nextInt(12) + 1;
g.drawLine(x, y, x + xl, y + yl);
}

for (int i = 0; i < 70; i++) {
int x = random.nextInt(width - 1);
int y = random.nextInt(height - 1);
int xl = random.nextInt(12) + 1;
int yl = random.nextInt(6) + 1;
g.drawLine(x, y, x - xl, y - yl);
}

for (int i = 0; i < 4; i++) {
int itmp = 0;
if (random.nextInt(2) == 1) {
itmp = random.nextInt(26) + 65;
char ctmp = (char) itmp;
sRand += String.valueOf(ctmp);
g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
g.drawString(String.valueOf(ctmp), 15 * i + 10, 16);

} else if (random.nextInt(3) == 1) {
itmp = random.nextInt(26) + 97;
char ctmp = (char) itmp;
sRand += String.valueOf(ctmp);
g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
g.drawString(String.valueOf(ctmp), 15 * i + 10, 16);
} else {
itmp = random.nextInt(9);
sRand += String.valueOf(itmp);
g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
g.drawString(String.valueOf(itmp), 15 * i + 10, 16);
}

}

HttpSession session = request.getSession(true);
session.setAttribute("checkcode", sRand);
g.dispose();
try {
ImageIO.write(image, "JPEG", response.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
}

2.在struts.xml中

<result name="checkacode" type="json">
<param name="root">cacodet</param>
</result>
<result name="register">/login.jsp</result>
<result name="registererror">/personreg.jsp</result>
<result name="login">/index.jsp</result>
<result name="loginerror">/login.jsp</result>

3.在register.jsp中

<script type="text/javascript">
function reImg(){
var img = document.getElementById("picture");
img.src=img.src + "?";
}
</script>
<TR>

<TD class=mustcontent><SPAN>*</SPAN>验证码：</TD>
<td>
<input type="text" id="acodet" name="acode" style="width:110px" value="${randomCode}">
<span id="acode">
<a href="javascript:void(0);" onclick="reImg();" class="changeacode">
<img id="picture"
src="${pageContext.request.contextPath }/csdn/MemberAction_checkCodeImage.action?nowtime="
style="position:relative;top:5px;border:0;">
</a>
</span>
<span style="font-size:12px;color:rgb(150,150,150);margin-left:5px">看不清？
<a class="changeacode"   href="javascript:void(0);" onclick="reImg();">换一张
</a>
</span>
</td>
</TR>

4.效果如下：