1.pom.xml中匯入架包

        <dependency>
            <groupId>com.google.code</groupId>
            <artifactId>kaptcha</artifactId>
            <version>2.3.2</version>
        </dependency>

2.web-mvc.xml新增驗證碼的主要配置，如顏色等

    <!-- 驗證碼 -->
    <bean id="captchaProducer" class="com.google.code.kaptcha.impl.DefaultKaptcha">
        <property name="config">
            <bean class="com.google.code.kaptcha.util.Config">
                <constructor-arg>
                    <props>
                        <prop key="kaptcha.border">no</prop>
                        <prop key="kaptcha.textproducer.font.color">20,15,90</prop>
                        <prop key="kaptcha.textproducer.char.length">4</prop>
                        <prop key="kaptcha.image.width">124</prop>
                        <prop key="kaptcha.textproducer.char.space">1</prop>
                        <prop key="kaptcha.textproducer.font.size">30</prop>
                        <prop key="kaptcha.image.height">35</prop>
                        <prop key="kaptcha.textproducer.font.names">Arial</prop>
                        <prop key="kaptcha.noise.impl">com.google.code.kaptcha.impl.NoNoise</prop>
                        <prop key="kaptcha.background.clear.from">white</prop>
                        <prop key="kaptcha.obscurificator.impl">com.google.code.kaptcha.impl.ShadowGimpy</prop>
                    </props>
                </constructor-arg>
            </bean>
        </property>
    </bean>
 

3.生成驗證碼圖片

    public void handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
        response.setDateHeader("Expires", 0);
        // Set standard HTTP/1.1 no-cache headers.
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        // Set standard HTTP/1.0 no-cache header.
        response.setHeader("Pragma", "no-cache");
        // return a jpeg
        response.setContentType("image/jpeg");
        // create the text for the image
        String capText = captchaProducer.createText();
        System.err.println(capText);
        // store the text in the session
        request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
        // 存放到快取伺服器上，並把key記錄到cookie
        //CodeUtils.creatCode(capText, response, request);
        // create the image with the text
        BufferedImage bi = captchaProducer.createImage(capText);
        ServletOutputStream out = response.getOutputStream();
        // write the data out
        ImageIO.write(bi, "jpg", out);
        try {
            out.flush();
        } finally {
            out.close();
        }
    }
 

ps:但是本地測試正常（圖一），部署到正式伺服器上（圖二）

（圖1）

(圖二)

只想說是什麼鬼，後臺查詢是發現伺服器上沒有安裝配置的字型Arial，安裝後重啟tomcat即可