设计目的
提高网站安全级别，防止非法扫描识别验证码
验证码效果图（访问地址:http://xxxx:xxxx/checkCode/userlogin.html）
开发环境
1.jdk1.7+tomcat
2.springMVC框架（jar包如下）
3.目录结构
代码
1.web.xml配置
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
2.applicationContext.xml配置
<!-- 开启注解扫描 -->
<context:component-scan base-package="controller"></context:component-scan>
<!-- 开启Controller注解扫描 -->
<mvc:annotation-driven/>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/"></property>
<property name="suffix" value=".html"></property>
</bean>
3.userlogin.html
<div style="text-align:center;margin-top:200px;">
<input id="checkcode" name="checkcode" type="text" placeholder="选择加粗的数字" style="width:260px;height:30px;"/><br><br>
<img id="imgCode" name="imgCode" src="loginimg.do" onclick="this.src=‘loginimg.do?m=‘+new Date().getTime()" style="cursor: pointer;width:260px;height:50px;" title="点击刷新">
</div>
4.commons-zhzhair.properties配置
5.propertiesValues.java读取参数
public static String getString(Class<?> className,String type){
Properties properties = new Properties();
try {
properties.load(className.getResourceAsStream("/commons-zhzhair.properties"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if("checkcodeStr".equals(type)){
return properties.getProperty("checkcodeStr");
}else if("checkcodeFace".equals(type)){
return properties.getProperty("checkcodeFace");
}else{
try {
throw new Exception("the key does not exit");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
public static Integer getInteger(Class<?> className,String type){
Properties properties = new Properties();
try {
properties.load(className.getResourceAsStream("/commons-zhzhair.properties"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if("codeCount".equals(type)){
return Integer.parseInt(properties.getProperty("codeCount"));
}else if("width".equals(type)){
return Integer.parseInt(properties.getProperty("width"));
}else if("height".equals(type)){
return Integer.parseInt(properties.getProperty("height"));
}else if("grayIndex".equals(type)){
return Integer.parseInt(properties.getProperty("grayIndex"));
}else if("dotsNum".equals(type)){
return Integer.parseInt(properties.getProperty("dotsNum"));
}else if("dotsLen".equals(type)){
return Integer.parseInt(properties.getProperty("dotsLen"));
}else if("fontSize".equals(type)){
return Integer.parseInt(properties.getProperty("fontSize"));
}else if("wave".equals(type)){
return Integer.parseInt(properties.getProperty("wave"));
}else if("marginleft".equals(type)){
return Integer.parseInt(properties.getProperty("marginleft"));
}else if("paddingright".equals(type)){
return Integer.parseInt(properties.getProperty("paddingright"));
}else if("bottomtotop".equals(type)){
return Integer.parseInt(properties.getProperty("bottomtotop"));
}else{
try {
throw new Exception("the key does not exit");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
public static Double getDouble(Class<?> className,String type){
Properties properties = new Properties();
try {
properties.load(className.getResourceAsStream("/commons-zhzhair.properties"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if("codeRatio".equals(type)){
return Double.parseDouble(properties.getProperty("codeRatio"));
}else{
try {
throw new Exception("the key does not exit");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
6.ImgCode.java实现验证码的方法
private static final String STR = PropertiesValues.getString(ImgCode.class, "checkcodeStr");
private static final String FACESTR = PropertiesValues.getString(ImgCode.class, "checkcodeFace");
private static final int CODECOUNT = PropertiesValues.getInteger(ImgCode.class, "codeCount");
private static final int WIDTH = PropertiesValues.getInteger(ImgCode.class, "width");
private static final int HEIGHT = PropertiesValues.getInteger(ImgCode.class, "height");
private static final int GRAYINDEX = PropertiesValues.getInteger(ImgCode.class, "grayIndex");
private static final int FONTSIZE = PropertiesValues.getInteger(ImgCode.class, "fontSize");
private static final int WAVE = PropertiesValues.getInteger(ImgCode.class, "wave");
private static final int MARGINLEFT = PropertiesValues.getInteger(ImgCode.class, "marginleft");
private static final int PADDINGRIGHT = PropertiesValues.getInteger(ImgCode.class, "paddingright");
private static final int BOTTOMTOTOP = PropertiesValues.getInteger(ImgCode.class, "bottomtotop");
private static final double CODERATIO = PropertiesValues.getDouble(ImgCode.class, "codeRatio");
/**
* @todo 生成不同颜色字符拼接的验证码字符串
*/
public static String codeCreateWithColor(OutputStream outputStream){
/*添加图片和画笔*/
BufferedImage bufferedImage = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2d = (Graphics2D) bufferedImage.getGraphics();
graphics2d.setColor(new Color(GRAYINDEX,GRAYINDEX,GRAYINDEX));
graphics2d.fillRect(0, 0, WIDTH, HEIGHT);
/*选择加粗的数字，并拼接到一起*/
StringBuffer sb = new StringBuffer();
Set<Integer> set = getSet(CODECOUNT);//随机获取图片中的n/2~n-1个验证码
for (int i = 0; i < CODECOUNT; i++) {
if(set.contains(i)){
graphics2d.setFont(new Font(FACESTR, Font.BOLD, (int)(FONTSIZE*CODERATIO)));
}else{
graphics2d.setFont(new Font(FACESTR, Font.PLAIN, FONTSIZE));
}
graphics2d.setColor(new Color(new Random().nextInt(256), new Random().nextInt(256), new Random().nextInt(256)));
String str = STR.charAt(new Random().nextInt(STR.length()))+"";
graphics2d.drawString(str, MARGINLEFT+PADDINGRIGHT*i, BOTTOMTOTOP+new Random().nextInt(WAVE));
if(set.contains(i)){
sb.append(str);
}
}
graphics2d.dispose();
/*作为输出流输出*/
try {
ImageIO.write(bufferedImage, "JPEG" , outputStream);
} catch (FileNotFoundException e) {e.printStackTrace();
} catch (IOException e) {e.printStackTrace();}
return sb.toString();
}
//随机获取图片中的n/2~n-1个验证码
public static Set<Integer> getSet(Integer n){
Set<Integer> set = new HashSet<Integer>();
int countneed = n/2;
int count = new Random().nextInt(countneed+1)+countneed;
while(set.size()<count-1){
set.add(new Random().nextInt(n));
}
return set;
}
7.UserController.java写验证码到html
@RequestMapping(value = "/loginimg")
public void showImgCode(HttpServletRequest req,
/*取消浏览器缓存*/
HttpServletResponse resp) {
resp.setHeader("Pragma", "No-cache");
resp.setHeader("Cache-Control", "No-cache");
resp.setDateHeader("Expires", 0);
try {
req.getSession().setAttribute("imgCode", ImgCode.codeCreateWithColor(resp.getOutputStream()));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}