1、创建一个Maven项目
2、在pom.xml中引入相关依赖
1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 2 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> 3 <modelVersion>4.0.0</modelVersion> 4 <groupId>com.wisezone</groupId> 5 <artifactId>wdh_kaptcha</artifactId> 6 <packaging>war</packaging> 7 <version>0.0.1-SNAPSHOT</version> 8 <name>wdh_kaptcha Maven Webapp</name> 9 <url>http://maven.apache.org</url> 10 11 <properties> 12 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 13 <!-- 定义spring的版本变量在dependency里面直接引用 --> 14 <spring.version>4.3.2.RELEASE</spring.version> 15 <slf4j.version>1.7.2</slf4j.version> 16 </properties> 17 18 <dependencies> 19 <!-- spring mvc --> 20 <dependency> 21 <groupId>org.springframework</groupId> 22 <artifactId>spring-webmvc</artifactId> 23 <version>${spring.version}</version> 24 </dependency> 25 <!-- web开发要有servlet --> 26 <dependency> 27 <groupId>javax.servlet</groupId> 28 <artifactId>javax.servlet-api</artifactId> 29 <version>3.0.1</version> 30 </dependency> 31 32 <!-- 日志打印相关的jar --> 33 <dependency> 34 <groupId>org.slf4j</groupId> 35 <artifactId>slf4j-log4j12</artifactId> 36 <version>${slf4j.version}</version> 37 </dependency> 38 <dependency> 39 <groupId>org.slf4j</groupId> 40 <artifactId>slf4j-api</artifactId> 41 <version>${slf4j.version}</version> 42 </dependency> 43 44 <!-- 验证码的生成 --> 45 <dependency> 46 <groupId>com.github.axet</groupId> 47 <artifactId>kaptcha</artifactId> 48 <version>0.0.9</version> 49 </dependency> 50 </dependencies> 51 <build> 52 <finalName>wdh_kaptcha</finalName> 53 <!-- 资源文件的设置 --> 54 <resources> 55 <resource> 56 <directory>src/main/resources</directory> 57 </resource> 58 <resource> 59 <directory>src/main/java</directory> 60 <includes> 61 <include>**/*.properties</include> 62 <include>**/*.xml</include> 63 </includes> 64 <!-- 是否替换资源中的属性 --> 65 <filtering>false</filtering> 66 </resource> 67 </resources> 68 <plugins> 69 <!-- compiler plugin --> 70 <plugin> 71 <groupId>org.apache.maven.plugins</groupId> 72 <artifactId>maven-compiler-plugin</artifactId> 73 <version>2.3.2</version> 74 <configuration> 75 <source>1.7</source> 76 <target>1.7</target> 77 <encoding>UTF-8</encoding> 78 <compilerArguments> 79 <bootclasspath>${java.home}/lib/rt.jar</bootclasspath> 80 </compilerArguments> 81 </configuration> 82 </plugin> 83 <plugin> 84 <groupId>org.eclipse.jetty</groupId> 85 <artifactId>jetty-maven-plugin</artifactId> 86 <version>9.2.1.v20140609</version> 87 </plugin> 88 </plugins> 89 </build> 90 </project>
3、启动WEB容器要在web.xml中配置前端控制器（DispatcherServlet）
1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app id="WebApp_ID" version="3.0" 3 xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> 5 <servlet> 6 <servlet-name>appServlet</servlet-name> 7 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 8 <init-param> 9 <param-name>contextConfigLocation</param-name> 10 <param-value>classpath:*.xml</param-value> 11 </init-param> 12 <!-- 表示启动容器时初始化该Servlet --> 13 <load-on-startup>1</load-on-startup> 14 15 </servlet> 16 17 <servlet-mapping> 18 <servlet-name>appServlet</servlet-name> 19 <!-- 这是拦截请求, /代表拦截所有请求, 也可以是.html或者.action这类的 --> 20 <url-pattern>/</url-pattern> 21 </servlet-mapping> 22 23 <filter> 24 <filter-name>CharacterEncodingFilter</filter-name> 25 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> 26 <init-param> 27 <param-name>encoding</param-name> 28 <param-value>UTF-8</param-value> 29 </init-param> 30 </filter> 31 <filter-mapping> 32 <filter-name>CharacterEncodingFilter</filter-name> 33 <url-pattern>/*</url-pattern> 34 </filter-mapping> 35 </web-app>
4、src/main/resources中配置相关信息
a、log4j.properties
1 log4j.rootLogger=DEBUG, Console 2 3 #Console 4 log4j.appender.Console=org.apache.log4j.ConsoleAppender 5 log4j.appender.Console.layout=org.apache.log4j.PatternLayout 6 log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n 7 8 log4j.logger.java.sql.ResultSet=INFO 9 log4j.logger.org.apache=INFO 10 log4j.logger.java.sql.Connection=DEBUG 11 log4j.logger.java.sql.Statement=DEBUG 12 log4j.logger.java.sql.PreparedStatement=DEBUG
b、servlet-context.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:context="http://www.springframework.org/schema/context" 5 xmlns:p="http://www.springframework.org/schema/p" 6 xsi:schemaLocation=" 7 http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 8 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> 9 10 <!-- 扫描package方便注解依赖注入--> 11 <context:component-scan base-package="com.wisezone" /> 12 13 <!--图片验证码配置 --> 14 <bean id="captchaProducer" class="com.google.code.kaptcha.impl.DefaultKaptcha"> 15 <property name="config"> 16 <bean class="com.google.code.kaptcha.util.Config"> 17 <constructor-arg> 18 <props> 19 <prop key="kaptcha.border">yes</prop><!--是否有边框 --> 20 <prop key="kaptcha.border.color">105,179,90</prop><!--设置边框颜色 --> 21 <prop key="kaptcha.textproducer.font.color">green</prop><!--验证码文本字符颜色 默认为Color.BLACK --> 22 <prop key="kaptcha.session.key">code</prop><!--验证码 --> 23 <prop key="kaptcha.textproducer.font.names">宋体,楷体,微软雅黑</prop><!--设置字体样式 --> 24 <prop key="kaptcha.border.thickness"></prop><!--边框粗细度 默认为1 --> 25 <prop key="kaptcha.producer.impl"></prop><!--验证码生成器 默认为DefaultKaptcha --> 26 <prop key="kaptcha.textproducer.impl"></prop><!-- 验证码文本生成器 默认为DefaultTextCreator --> 27 <prop key="kaptcha.textproducer.char.string"></prop><!--验证码文本字符内容范围 默认为abcde2345678gfynmnpwx --> 28 <prop key="kaptcha.textproducer.char.length">4</prop><!-- 验证码文本字符长度 默认为5 --> 29 <prop key="kaptcha.textproducer.font.size">50</prop><!--验证码文本字符大小 默认为40 --> 30 <prop key="kaptcha.textproducer.char.space">6</prop> <!--验证码文本字符间距 默认为2 --> 31 <prop key="kaptcha.image.width">200</prop> <!--验证码图片宽度 默认为200 --> 32 <prop key="kaptcha.image.height">60</prop> <!--验证码图片高度 默认为40 --> 33 </props> 34 </constructor-arg> 35 </bean> 36 </property> 37 </bean> 38 39 40 </beans>
5、Demo演示
KaptchaController.java
1 package com.wisezone.kaptcha; 2 3 import java.awt.image.BufferedImage; 4 5 import javax.imageio.ImageIO; 6 import javax.servlet.ServletOutputStream; 7 import javax.servlet.http.HttpServletRequest; 8 import javax.servlet.http.HttpServletResponse; 9 10 import org.springframework.beans.factory.annotation.Autowired; 11 import org.springframework.stereotype.Controller; 12 import org.springframework.web.bind.annotation.RequestMapping; 13 14 import com.google.code.kaptcha.Constants; 15 import com.google.code.kaptcha.Producer; 16 17 18 @Controller 19 @RequestMapping("kaptcha") 20 public class KaptchaController { 21 22 @Autowired 23 private Producer captchaProducer; 24 25 @RequestMapping("getKaptchaImage") 26 public void getKaptchaImage(HttpServletRequest request, 27 HttpServletResponse response) throws Exception { 28 29 response.setDateHeader("Expires", 0); 30 31 // Set standard HTTP/1.1 no-cache headers. 32 response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate"); 33 // Set IE extended HTTP/1.1 no-cache headers (use addHeader). 34 response.addHeader("Cache-Control", "post-check=0, pre-check=0"); 35 // Set standard HTTP/1.0 no-cache header. 36 response.setHeader("Pragma", "no-cache"); 37 // return a jpeg 38 response.setContentType("image/jpeg"); 39 // create the text for the image 40 String capText = captchaProducer.createText(); 41 // store the text in the session 42 request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText); 43 // create the image with the text 44 BufferedImage bi = captchaProducer.createImage(capText); 45 ServletOutputStream out = response.getOutputStream(); 46 // write the data out 47 ImageIO.write(bi, "jpg", out); 48 try { 49 out.flush(); 50 } finally { 51 out.close(); 52 } 53 } 54 }
6、启动容器查看结果：
浏览器：http://localhost:8080/kaptcha/getKaptchaImage
