Java如何实现三种图片验证码生成：纯字母、算术式和中文混合？

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第一种方法+完全由字母和数字组成+package+com.myFirstSpring.util+;+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+j+E+;

第一种方法 全是字母和数字组成

package com.myFirstSpring.util; 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.ServletException; import javax.servlet.ServletOutputStream; import javax.servlet.www.w3.org/2001/XMLSchema-instance" xmlns="java.sun.com/xml/ns/javaee" xmlns:web="java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="java.sun.com/xml/ns/javaee java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <display-name>CoBiker</display-name> <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>*</url-pattern> </filter-mapping> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <servlet-name>action</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>action</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <servlet> <servlet-name>Validate</servlet-name> <servlet-class>com.myFirstSpring.util.ValidateCodeUtils</servlet-class> </servlet> <servlet-mapping> <servlet-name>Validate</servlet-name> <url-pattern>/servlet/Validate</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.ftl</welcome-file> </welcome-file-list> <error-page> <error-code>404</error-code> <location>/WEB-INF/view/404.ftl</location> <!-- 1 错误页面跳转 本地项目因为是8080访问所以会报错 /WEB-INF/view/error.ftl --> <!-- 2还可以通过控制器来实现跳转 /404 --> </error-page> <error-page> <error-code>500</error-code> <location>/index.ftl</location> </error-page> <login-config> <auth-method>BASIC</auth-method> </login-config> </web-app>

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