我在网上找了个struts验证码整页刷新的话没问题但是如果只刷新验证码图片时就会出错了action代码:package struts.action;import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.commons.lang.RandomStringUtils;
public class CodeAction extends Action {
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
try {
System.out.println("进");
int width = 50;
int height = 18;
// 取得一个4位随机字母数字字符串
String s = RandomStringUtils.random(4, true, true); // 保存入session,用于与用户的输入进行比较.
// 注意比较完之后清除session.
HttpSession session = request.getSession(true);
session.setAttribute("validateCode", s); response.setContentType("images/jpeg");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0); ServletOutputStream out = response.getOutputStream();
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
// 设定背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height); // 设定字体
Font mFont = new Font("Times New Roman", Font.BOLD, 18);// 设置字体
g.setFont(mFont); // 画边框
// g.setColor(Color.BLACK);
// g.drawRect(0, 0, width - 1, height - 1); // 随机产生干扰线,使图象中的认证码不易被其它程序探测到
g.setColor(getRandColor(160, 200));
// 生成随机类
Random random = new Random();
for (int i = 0; i < 155; i++) {
int x2 = random.nextInt(width);
int y2 = random.nextInt(height);
int x3 = random.nextInt(12);
int y3 = random.nextInt(12);
g.drawLine(x2, y2, x2 + x3, y2 + y3);
} // 将认证码显示到图象中
g.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110))); g.drawString(s, 2, 16); // 图象生效
g.dispose();
// 输出图象到页面
ImageIO.write((BufferedImage) image, "JPEG", out);
out.close();
} catch (Exception e) {
e.printStackTrace();
}
return null;
} private Color getRandColor(int fc, int bc) { // 给定范围获得随机颜色
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);
}
}jsp代码<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title></head>
<body>
<html:img page="/code.do" border="0" onclick="this.src='/code.do'" alt="请输入此验证码,如看不清请点击刷新。" style="cursor:pointer" />
</body>
</html>struts-config.xml<action path="/code"
input="/public/Login.jsp"
type="struts.action.CodeAction"
validate="true"
scope="request">
<forward name="codeSuccess" path="/private/LoginSuccess.jsp"></forward>
</action>整页刷新的话没问题只刷新验证码图片时就会出错了我还试过直接用超链接和js提交,全都报错,请帮忙看看``
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.commons.lang.RandomStringUtils;
public class CodeAction extends Action {
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
try {
System.out.println("进");
int width = 50;
int height = 18;
// 取得一个4位随机字母数字字符串
String s = RandomStringUtils.random(4, true, true); // 保存入session,用于与用户的输入进行比较.
// 注意比较完之后清除session.
HttpSession session = request.getSession(true);
session.setAttribute("validateCode", s); response.setContentType("images/jpeg");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0); ServletOutputStream out = response.getOutputStream();
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
// 设定背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height); // 设定字体
Font mFont = new Font("Times New Roman", Font.BOLD, 18);// 设置字体
g.setFont(mFont); // 画边框
// g.setColor(Color.BLACK);
// g.drawRect(0, 0, width - 1, height - 1); // 随机产生干扰线,使图象中的认证码不易被其它程序探测到
g.setColor(getRandColor(160, 200));
// 生成随机类
Random random = new Random();
for (int i = 0; i < 155; i++) {
int x2 = random.nextInt(width);
int y2 = random.nextInt(height);
int x3 = random.nextInt(12);
int y3 = random.nextInt(12);
g.drawLine(x2, y2, x2 + x3, y2 + y3);
} // 将认证码显示到图象中
g.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110))); g.drawString(s, 2, 16); // 图象生效
g.dispose();
// 输出图象到页面
ImageIO.write((BufferedImage) image, "JPEG", out);
out.close();
} catch (Exception e) {
e.printStackTrace();
}
return null;
} private Color getRandColor(int fc, int bc) { // 给定范围获得随机颜色
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);
}
}jsp代码<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title></head>
<body>
<html:img page="/code.do" border="0" onclick="this.src='/code.do'" alt="请输入此验证码,如看不清请点击刷新。" style="cursor:pointer" />
</body>
</html>struts-config.xml<action path="/code"
input="/public/Login.jsp"
type="struts.action.CodeAction"
validate="true"
scope="request">
<forward name="codeSuccess" path="/private/LoginSuccess.jsp"></forward>
</action>整页刷新的话没问题只刷新验证码图片时就会出错了我还试过直接用超链接和js提交,全都报错,请帮忙看看``
楼主【heisetoufa】截止到2008-08-02 18:03:06的历史汇总数据(不包括此帖):
发帖的总数量:157 发帖的总分数:4329 每贴平均分数:27
回帖的总数量:918 得分贴总数量:372 回帖的得分率:40%
结贴的总数量:155 结贴的总分数:4128
无满意结贴数:1 无满意结贴分:0
未结的帖子数:2 未结的总分数:201
结贴的百分比:98.73 % 结分的百分比:95.36 %
无满意结贴率:0.65 % 无满意结分率:0.00 %
值得尊敬
取消马甲机器人,请点这里:http://www.java2000.net/mycsdn/robotStop.jsp?usern=heisetoufa
运行得很好,没有问题LZ把具体错误贴出来,不然只有神仙知道是什么错了
<html:img page="/code.do" border="0" onclick="code()" alt="请输入此验证码,如看不清请点击刷新。" style="cursor:pointer" />function code()
{
window.location.href = "code.do";
}报404错误错误如下:HTTP Status 404 - Invalid path was requested--------------------------------------------------------------------------------type Status reportmessage Invalid path was requesteddescription The requested resource (Invalid path was requested) is not available.后台是:2008-8-2 18:40:32 org.apache.struts.action.RequestProcessor processMapping
严重: Invalid path was requested /public/code
onclick="this.src='/code.do'"
这里要加上我的工程名不知道为什么onclick="this.src='/lookctrl/code.do'"
// Math.random() is must.
obj.src = '<%=request.getContextPath()%>/yourAcation.do?' + Math.random();
}
<html:img page="/code.do" border="0" onclick="changeImage(this)"0
alt="请输入此验证码,如看不清请点击刷新。" style="cursor:pointer" />**// 随机数Math.random()是必须的